Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/os_linux.cpp @ 24140:d4858e92c9b1
[GR-4077] support Graal.SDK on the boot class path and Truffle on a class path invisible to apps but visible to JVMCI
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 13 Jun 2017 14:22:54 +0200 |
parents | 9b69cec6d01b |
children | 719853999215 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 // no precompiled headers |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/vtableStubs.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
1972 | 33 #include "interpreter/interpreter.hpp" |
34 #include "jvm_linux.h" | |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "mutex_linux.inline.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "os_share_linux.hpp" | |
40 #include "prims/jniFastGetField.hpp" | |
41 #include "prims/jvm.h" | |
42 #include "prims/jvm_misc.hpp" | |
43 #include "runtime/arguments.hpp" | |
44 #include "runtime/extendedPC.hpp" | |
45 #include "runtime/globals.hpp" | |
46 #include "runtime/interfaceSupport.hpp" | |
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47 #include "runtime/init.hpp" |
1972 | 48 #include "runtime/java.hpp" |
49 #include "runtime/javaCalls.hpp" | |
50 #include "runtime/mutexLocker.hpp" | |
51 #include "runtime/objectMonitor.hpp" | |
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52 #include "runtime/orderAccess.inline.hpp" |
1972 | 53 #include "runtime/osThread.hpp" |
54 #include "runtime/perfMemory.hpp" | |
55 #include "runtime/sharedRuntime.hpp" | |
56 #include "runtime/statSampler.hpp" | |
57 #include "runtime/stubRoutines.hpp" | |
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58 #include "runtime/thread.inline.hpp" |
1972 | 59 #include "runtime/threadCritical.hpp" |
60 #include "runtime/timer.hpp" | |
61 #include "services/attachListener.hpp" | |
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62 #include "services/memTracker.hpp" |
1972 | 63 #include "services/runtimeService.hpp" |
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64 #include "utilities/decoder.hpp" |
1972 | 65 #include "utilities/defaultStream.hpp" |
66 #include "utilities/events.hpp" | |
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67 #include "utilities/elfFile.hpp" |
1972 | 68 #include "utilities/growableArray.hpp" |
69 #include "utilities/vmError.hpp" | |
0 | 70 |
71 // put OS-includes here | |
72 # include <sys/types.h> | |
73 # include <sys/mman.h> | |
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74 # include <sys/stat.h> |
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75 # include <sys/select.h> |
0 | 76 # include <pthread.h> |
77 # include <signal.h> | |
78 # include <errno.h> | |
79 # include <dlfcn.h> | |
80 # include <stdio.h> | |
81 # include <unistd.h> | |
82 # include <sys/resource.h> | |
83 # include <pthread.h> | |
84 # include <sys/stat.h> | |
85 # include <sys/time.h> | |
86 # include <sys/times.h> | |
87 # include <sys/utsname.h> | |
88 # include <sys/socket.h> | |
89 # include <sys/wait.h> | |
90 # include <pwd.h> | |
91 # include <poll.h> | |
92 # include <semaphore.h> | |
93 # include <fcntl.h> | |
94 # include <string.h> | |
95 # include <syscall.h> | |
96 # include <sys/sysinfo.h> | |
97 # include <gnu/libc-version.h> | |
98 # include <sys/ipc.h> | |
99 # include <sys/shm.h> | |
100 # include <link.h> | |
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101 # include <stdint.h> |
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102 # include <inttypes.h> |
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103 # include <sys/ioctl.h> |
0 | 104 |
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105 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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106 |
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107 // if RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling |
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108 // getrusage() is prepared to handle the associated failure. |
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109 #ifndef RUSAGE_THREAD |
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110 #define RUSAGE_THREAD (1) /* only the calling thread */ |
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111 #endif |
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112 |
0 | 113 #define MAX_PATH (2 * K) |
114 | |
17738 | 115 #define MAX_SECS 100000000 |
116 | |
0 | 117 // for timer info max values which include all bits |
118 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
119 | |
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120 #define LARGEPAGES_BIT (1 << 6) |
0 | 121 //////////////////////////////////////////////////////////////////////////////// |
122 // global variables | |
123 julong os::Linux::_physical_memory = 0; | |
124 | |
125 address os::Linux::_initial_thread_stack_bottom = NULL; | |
126 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
127 | |
128 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
129 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
130 Mutex* os::Linux::_createThread_lock = NULL; | |
131 pthread_t os::Linux::_main_thread; | |
132 int os::Linux::_page_size = -1; | |
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133 const int os::Linux::_vm_default_page_size = (8 * K); |
0 | 134 bool os::Linux::_is_floating_stack = false; |
135 bool os::Linux::_is_NPTL = false; | |
136 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
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137 const char * os::Linux::_glibc_version = NULL; |
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138 const char * os::Linux::_libpthread_version = NULL; |
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139 pthread_condattr_t os::Linux::_condattr[1]; |
0 | 140 |
141 static jlong initial_time_count=0; | |
142 | |
143 static int clock_tics_per_sec = 100; | |
144 | |
145 // For diagnostics to print a message once. see run_periodic_checks | |
146 static sigset_t check_signal_done; | |
14391 | 147 static bool check_signals = true; |
0 | 148 |
149 static pid_t _initial_pid = 0; | |
150 | |
151 /* Signal number used to suspend/resume a thread */ | |
152 | |
153 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
154 static int SR_signum = SIGUSR2; | |
155 sigset_t SR_sigset; | |
156 | |
242 | 157 /* Used to protect dlsym() calls */ |
158 static pthread_mutex_t dl_mutex; | |
159 | |
10405 | 160 // Declarations |
161 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
162 | |
0 | 163 // utility functions |
164 | |
165 static int SR_initialize(); | |
166 | |
167 julong os::available_memory() { | |
168 return Linux::available_memory(); | |
169 } | |
170 | |
171 julong os::Linux::available_memory() { | |
172 // values in struct sysinfo are "unsigned long" | |
173 struct sysinfo si; | |
174 sysinfo(&si); | |
175 | |
176 return (julong)si.freeram * si.mem_unit; | |
177 } | |
178 | |
179 julong os::physical_memory() { | |
180 return Linux::physical_memory(); | |
181 } | |
182 | |
183 //////////////////////////////////////////////////////////////////////////////// | |
184 // environment support | |
185 | |
186 bool os::getenv(const char* name, char* buf, int len) { | |
187 const char* val = ::getenv(name); | |
188 if (val != NULL && strlen(val) < (size_t)len) { | |
189 strcpy(buf, val); | |
190 return true; | |
191 } | |
192 if (len > 0) buf[0] = 0; // return a null string | |
193 return false; | |
194 } | |
195 | |
196 | |
197 // Return true if user is running as root. | |
198 | |
199 bool os::have_special_privileges() { | |
200 static bool init = false; | |
201 static bool privileges = false; | |
202 if (!init) { | |
203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
204 init = true; | |
205 } | |
206 return privileges; | |
207 } | |
208 | |
209 | |
210 #ifndef SYS_gettid | |
211 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
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212 #ifdef __ia64__ |
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213 #define SYS_gettid 1105 |
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214 #else |
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215 #ifdef __i386__ |
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216 #define SYS_gettid 224 |
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217 #else |
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218 #ifdef __amd64__ |
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219 #define SYS_gettid 186 |
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220 #else |
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221 #ifdef __sparc__ |
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222 #define SYS_gettid 143 |
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223 #else |
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224 #error define gettid for the arch |
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225 #endif |
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226 #endif |
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227 #endif |
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228 #endif |
0 | 229 #endif |
230 | |
231 // Cpu architecture string | |
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232 static char cpu_arch[] = HOTSPOT_LIB_ARCH; |
0 | 233 |
234 // pid_t gettid() | |
235 // | |
236 // Returns the kernel thread id of the currently running thread. Kernel | |
237 // thread id is used to access /proc. | |
238 // | |
239 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
240 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
241 // | |
242 pid_t os::Linux::gettid() { | |
243 int rslt = syscall(SYS_gettid); | |
244 if (rslt == -1) { | |
245 // old kernel, no NPTL support | |
246 return getpid(); | |
247 } else { | |
248 return (pid_t)rslt; | |
249 } | |
250 } | |
251 | |
252 // Most versions of linux have a bug where the number of processors are | |
253 // determined by looking at the /proc file system. In a chroot environment, | |
254 // the system call returns 1. This causes the VM to act as if it is | |
255 // a single processor and elide locking (see is_MP() call). | |
256 static bool unsafe_chroot_detected = false; | |
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257 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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258 "Java may be unstable running multithreaded in a chroot " |
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259 "environment on Linux when /proc filesystem is not mounted."; |
0 | 260 |
261 void os::Linux::initialize_system_info() { | |
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262 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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263 if (processor_count() == 1) { |
0 | 264 pid_t pid = os::Linux::gettid(); |
265 char fname[32]; | |
266 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
267 FILE *fp = fopen(fname, "r"); | |
268 if (fp == NULL) { | |
269 unsafe_chroot_detected = true; | |
270 } else { | |
271 fclose(fp); | |
272 } | |
273 } | |
274 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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275 assert(processor_count() > 0, "linux error"); |
0 | 276 } |
277 | |
278 void os::init_system_properties_values() { | |
279 // The next steps are taken in the product version: | |
280 // | |
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281 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 282 // This library should be located at: |
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283 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 284 // |
285 // If "/jre/lib/" appears at the right place in the path, then we | |
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286 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 287 // |
288 // Otherwise exit with message: "Could not create the Java virtual machine." | |
289 // | |
290 // The following extra steps are taken in the debugging version: | |
291 // | |
292 // If "/jre/lib/" does NOT appear at the right place in the path | |
293 // instead of exit check for $JAVA_HOME environment variable. | |
294 // | |
295 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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296 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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297 // it looks like libjvm.so is installed there |
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298 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 299 // |
300 // Otherwise exit. | |
301 // | |
302 // Important note: if the location of libjvm.so changes this | |
303 // code needs to be changed accordingly. | |
304 | |
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305 // See ld(1): |
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306 // The linker uses the following search paths to locate required |
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307 // shared libraries: |
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308 // 1: ... |
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309 // ... |
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310 // 7: The default directories, normally /lib and /usr/lib. |
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311 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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312 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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313 #else |
0 | 314 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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315 #endif |
0 | 316 |
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317 // Base path of extensions installed on the system. |
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318 #define SYS_EXT_DIR "/usr/java/packages" |
0 | 319 #define EXTENSIONS_DIR "/lib/ext" |
320 #define ENDORSED_DIR "/lib/endorsed" | |
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321 |
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322 // Buffer that fits several sprintfs. |
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323 // Note that the space for the colon and the trailing null are provided |
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324 // by the nulls included by the sizeof operator. |
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325 const size_t bufsize = |
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326 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
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327 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir |
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328 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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329 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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330 |
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331 // sysclasspath, java_home, dll_dir |
0 | 332 { |
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333 char *pslash; |
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334 os::jvm_path(buf, bufsize); |
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335 |
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336 // Found the full path to libjvm.so. |
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337 // Now cut the path to <java_home>/jre if we can. |
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338 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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339 pslash = strrchr(buf, '/'); |
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340 if (pslash != NULL) { |
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341 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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342 } |
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343 Arguments::set_dll_dir(buf); |
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344 |
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345 if (pslash != NULL) { |
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346 pslash = strrchr(buf, '/'); |
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347 if (pslash != NULL) { |
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348 *pslash = '\0'; // Get rid of /<arch>. |
0 | 349 pslash = strrchr(buf, '/'); |
350 if (pslash != NULL) { | |
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351 *pslash = '\0'; // Get rid of /lib. |
0 | 352 } |
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353 } |
0 | 354 } |
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355 Arguments::set_java_home(buf); |
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356 set_boot_path('/', ':'); |
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357 } |
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358 |
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359 // Where to look for native libraries. |
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360 // |
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361 // Note: Due to a legacy implementation, most of the library path |
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362 // is set in the launcher. This was to accomodate linking restrictions |
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363 // on legacy Linux implementations (which are no longer supported). |
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364 // Eventually, all the library path setting will be done here. |
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365 // |
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366 // However, to prevent the proliferation of improperly built native |
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367 // libraries, the new path component /usr/java/packages is added here. |
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368 // Eventually, all the library path setting will be done here. |
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369 { |
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370 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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371 // should always exist (until the legacy problem cited above is |
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372 // addressed). |
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373 const char *v = ::getenv("LD_LIBRARY_PATH"); |
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374 const char *v_colon = ":"; |
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375 if (v == NULL) { v = ""; v_colon = ""; } |
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376 // That's +1 for the colon and +1 for the trailing '\0'. |
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377 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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378 strlen(v) + 1 + |
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379 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
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380 mtInternal); |
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381 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
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382 Arguments::set_library_path(ld_library_path); |
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383 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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384 } |
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385 |
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386 // Extensions directories. |
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387 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
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388 Arguments::set_ext_dirs(buf); |
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389 |
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390 // Endorsed standards default directory. |
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391 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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392 Arguments::set_endorsed_dirs(buf); |
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393 |
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394 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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395 |
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396 #undef DEFAULT_LIBPATH |
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397 #undef SYS_EXT_DIR |
0 | 398 #undef EXTENSIONS_DIR |
399 #undef ENDORSED_DIR | |
400 } | |
401 | |
402 //////////////////////////////////////////////////////////////////////////////// | |
403 // breakpoint support | |
404 | |
405 void os::breakpoint() { | |
406 BREAKPOINT; | |
407 } | |
408 | |
409 extern "C" void breakpoint() { | |
410 // use debugger to set breakpoint here | |
411 } | |
412 | |
413 //////////////////////////////////////////////////////////////////////////////// | |
414 // signal support | |
415 | |
416 debug_only(static bool signal_sets_initialized = false); | |
417 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
418 | |
419 bool os::Linux::is_sig_ignored(int sig) { | |
420 struct sigaction oact; | |
421 sigaction(sig, (struct sigaction*)NULL, &oact); | |
422 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
423 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
424 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
425 return true; | |
426 else | |
427 return false; | |
428 } | |
429 | |
430 void os::Linux::signal_sets_init() { | |
431 // Should also have an assertion stating we are still single-threaded. | |
432 assert(!signal_sets_initialized, "Already initialized"); | |
433 // Fill in signals that are necessarily unblocked for all threads in | |
434 // the VM. Currently, we unblock the following signals: | |
435 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
436 // by -Xrs (=ReduceSignalUsage)); | |
437 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
438 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
439 // the dispositions or masks wrt these signals. | |
440 // Programs embedding the VM that want to use the above signals for their | |
441 // own purposes must, at this time, use the "-Xrs" option to prevent | |
442 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
443 // (See bug 4345157, and other related bugs). | |
444 // In reality, though, unblocking these signals is really a nop, since | |
445 // these signals are not blocked by default. | |
446 sigemptyset(&unblocked_sigs); | |
447 sigemptyset(&allowdebug_blocked_sigs); | |
448 sigaddset(&unblocked_sigs, SIGILL); | |
449 sigaddset(&unblocked_sigs, SIGSEGV); | |
450 sigaddset(&unblocked_sigs, SIGBUS); | |
451 sigaddset(&unblocked_sigs, SIGFPE); | |
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452 #if defined(PPC64) |
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453 sigaddset(&unblocked_sigs, SIGTRAP); |
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454 #endif |
0 | 455 sigaddset(&unblocked_sigs, SR_signum); |
456 | |
457 if (!ReduceSignalUsage) { | |
458 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
459 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
460 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
461 } | |
462 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
463 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
464 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
465 } | |
466 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
467 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
468 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
469 } | |
470 } | |
471 // Fill in signals that are blocked by all but the VM thread. | |
472 sigemptyset(&vm_sigs); | |
473 if (!ReduceSignalUsage) | |
474 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
475 debug_only(signal_sets_initialized = true); | |
476 | |
477 } | |
478 | |
479 // These are signals that are unblocked while a thread is running Java. | |
480 // (For some reason, they get blocked by default.) | |
481 sigset_t* os::Linux::unblocked_signals() { | |
482 assert(signal_sets_initialized, "Not initialized"); | |
483 return &unblocked_sigs; | |
484 } | |
485 | |
486 // These are the signals that are blocked while a (non-VM) thread is | |
487 // running Java. Only the VM thread handles these signals. | |
488 sigset_t* os::Linux::vm_signals() { | |
489 assert(signal_sets_initialized, "Not initialized"); | |
490 return &vm_sigs; | |
491 } | |
492 | |
493 // These are signals that are blocked during cond_wait to allow debugger in | |
494 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
495 assert(signal_sets_initialized, "Not initialized"); | |
496 return &allowdebug_blocked_sigs; | |
497 } | |
498 | |
499 void os::Linux::hotspot_sigmask(Thread* thread) { | |
500 | |
501 //Save caller's signal mask before setting VM signal mask | |
502 sigset_t caller_sigmask; | |
503 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
504 | |
505 OSThread* osthread = thread->osthread(); | |
506 osthread->set_caller_sigmask(caller_sigmask); | |
507 | |
508 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
509 | |
510 if (!ReduceSignalUsage) { | |
511 if (thread->is_VM_thread()) { | |
512 // Only the VM thread handles BREAK_SIGNAL ... | |
513 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
514 } else { | |
515 // ... all other threads block BREAK_SIGNAL | |
516 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
517 } | |
518 } | |
519 } | |
520 | |
521 ////////////////////////////////////////////////////////////////////////////// | |
522 // detecting pthread library | |
523 | |
524 void os::Linux::libpthread_init() { | |
525 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
526 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
527 // generic name for earlier versions. | |
528 // Define macros here so we can build HotSpot on old systems. | |
529 # ifndef _CS_GNU_LIBC_VERSION | |
530 # define _CS_GNU_LIBC_VERSION 2 | |
531 # endif | |
532 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
533 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
534 # endif | |
535 | |
536 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
537 if (n > 0) { | |
6197 | 538 char *str = (char *)malloc(n, mtInternal); |
0 | 539 confstr(_CS_GNU_LIBC_VERSION, str, n); |
540 os::Linux::set_glibc_version(str); | |
541 } else { | |
542 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
543 static char _gnu_libc_version[32]; | |
544 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
545 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
546 os::Linux::set_glibc_version(_gnu_libc_version); | |
547 } | |
548 | |
549 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
550 if (n > 0) { | |
6197 | 551 char *str = (char *)malloc(n, mtInternal); |
0 | 552 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
553 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
554 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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555 // is the case. LinuxThreads has a hard limit on max number of threads. |
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556 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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557 // On the other hand, NPTL does not have such a limit, sysconf() |
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558 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 559 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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560 strstr(str, "NPTL") && |
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561 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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562 free(str); |
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563 os::Linux::set_libpthread_version("linuxthreads"); |
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564 } else { |
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565 os::Linux::set_libpthread_version(str); |
0 | 566 } |
567 } else { | |
199
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568 // glibc before 2.3.2 only has LinuxThreads. |
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569 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 570 } |
571 | |
572 if (strstr(libpthread_version(), "NPTL")) { | |
573 os::Linux::set_is_NPTL(); | |
574 } else { | |
575 os::Linux::set_is_LinuxThreads(); | |
576 } | |
577 | |
578 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
579 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
580 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
581 os::Linux::set_is_floating_stack(); | |
582 } | |
583 } | |
584 | |
585 ///////////////////////////////////////////////////////////////////////////// | |
586 // thread stack | |
587 | |
588 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
589 // to the stack guard, caller should block all signals. | |
590 // | |
591 // MAP_GROWSDOWN: | |
592 // A special mmap() flag that is used to implement thread stacks. It tells | |
593 // kernel that the memory region should extend downwards when needed. This | |
594 // allows early versions of LinuxThreads to only mmap the first few pages | |
595 // when creating a new thread. Linux kernel will automatically expand thread | |
596 // stack as needed (on page faults). | |
597 // | |
598 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
599 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
600 // region, it's hard to tell if the fault is due to a legitimate stack | |
601 // access or because of reading/writing non-exist memory (e.g. buffer | |
602 // overrun). As a rule, if the fault happens below current stack pointer, | |
603 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
604 // application (see Linux kernel fault.c). | |
605 // | |
606 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
607 // stack overflow detection. | |
608 // | |
609 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
610 // not use this flag. However, the stack of initial thread is not created | |
611 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
612 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
613 // and then attach the thread to JVM. | |
614 // | |
615 // To get around the problem and allow stack banging on Linux, we need to | |
616 // manually expand thread stack after receiving the SIGSEGV. | |
617 // | |
618 // There are two ways to expand thread stack to address "bottom", we used | |
619 // both of them in JVM before 1.5: | |
620 // 1. adjust stack pointer first so that it is below "bottom", and then | |
621 // touch "bottom" | |
622 // 2. mmap() the page in question | |
623 // | |
624 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
625 // if current sp is already near the lower end of page 101, and we need to | |
626 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
627 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
628 // That will destroy the mmap() frame and cause VM to crash. | |
629 // | |
630 // The following code works by adjusting sp first, then accessing the "bottom" | |
631 // page to force a page fault. Linux kernel will then automatically expand the | |
632 // stack mapping. | |
633 // | |
634 // _expand_stack_to() assumes its frame size is less than page size, which | |
635 // should always be true if the function is not inlined. | |
636 | |
637 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
638 #define NOINLINE | |
639 #else | |
640 #define NOINLINE __attribute__ ((noinline)) | |
641 #endif | |
642 | |
643 static void _expand_stack_to(address bottom) NOINLINE; | |
644 | |
645 static void _expand_stack_to(address bottom) { | |
646 address sp; | |
647 size_t size; | |
648 volatile char *p; | |
649 | |
650 // Adjust bottom to point to the largest address within the same page, it | |
651 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
652 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
653 bottom += os::Linux::page_size() - 1; | |
654 | |
655 // sp might be slightly above current stack pointer; if that's the case, we | |
656 // will alloca() a little more space than necessary, which is OK. Don't use | |
657 // os::current_stack_pointer(), as its result can be slightly below current | |
658 // stack pointer, causing us to not alloca enough to reach "bottom". | |
659 sp = (address)&sp; | |
660 | |
661 if (sp > bottom) { | |
662 size = sp - bottom; | |
663 p = (volatile char *)alloca(size); | |
664 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
665 p[0] = '\0'; | |
666 } | |
667 } | |
668 | |
669 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
670 assert(t!=NULL, "just checking"); | |
671 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
672 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
673 | |
674 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
675 sigset_t mask_all, old_sigset; | |
676 sigfillset(&mask_all); | |
677 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
678 _expand_stack_to(addr); | |
679 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
680 return true; | |
681 } | |
682 return false; | |
683 } | |
684 | |
685 ////////////////////////////////////////////////////////////////////////////// | |
686 // create new thread | |
687 | |
688 static address highest_vm_reserved_address(); | |
689 | |
690 // check if it's safe to start a new thread | |
691 static bool _thread_safety_check(Thread* thread) { | |
692 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
693 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
694 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
695 // allocated (MAP_FIXED) from high address space. Every thread stack | |
696 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
697 // it to other values if they rebuild LinuxThreads). | |
698 // | |
699 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
700 // the memory region has already been mmap'ed. That means if we have too | |
701 // many threads and/or very large heap, eventually thread stack will | |
702 // collide with heap. | |
703 // | |
704 // Here we try to prevent heap/stack collision by comparing current | |
705 // stack bottom with the highest address that has been mmap'ed by JVM | |
706 // plus a safety margin for memory maps created by native code. | |
707 // | |
708 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
709 // | |
710 if (ThreadSafetyMargin > 0) { | |
711 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
712 | |
713 // not safe if our stack extends below the safety margin | |
714 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
715 } else { | |
716 return true; | |
717 } | |
718 } else { | |
719 // Floating stack LinuxThreads or NPTL: | |
720 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
721 // there's not enough space left, pthread_create() will fail. If we come | |
722 // here, that means enough space has been reserved for stack. | |
723 return true; | |
724 } | |
725 } | |
726 | |
727 // Thread start routine for all newly created threads | |
728 static void *java_start(Thread *thread) { | |
729 // Try to randomize the cache line index of hot stack frames. | |
730 // This helps when threads of the same stack traces evict each other's | |
731 // cache lines. The threads can be either from the same JVM instance, or | |
732 // from different JVM instances. The benefit is especially true for | |
733 // processors with hyperthreading technology. | |
734 static int counter = 0; | |
735 int pid = os::current_process_id(); | |
736 alloca(((pid ^ counter++) & 7) * 128); | |
737 | |
738 ThreadLocalStorage::set_thread(thread); | |
739 | |
740 OSThread* osthread = thread->osthread(); | |
741 Monitor* sync = osthread->startThread_lock(); | |
742 | |
743 // non floating stack LinuxThreads needs extra check, see above | |
744 if (!_thread_safety_check(thread)) { | |
745 // notify parent thread | |
746 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
747 osthread->set_state(ZOMBIE); | |
748 sync->notify_all(); | |
749 return NULL; | |
750 } | |
751 | |
752 // thread_id is kernel thread id (similar to Solaris LWP id) | |
753 osthread->set_thread_id(os::Linux::gettid()); | |
754 | |
755 if (UseNUMA) { | |
756 int lgrp_id = os::numa_get_group_id(); | |
757 if (lgrp_id != -1) { | |
758 thread->set_lgrp_id(lgrp_id); | |
759 } | |
760 } | |
761 // initialize signal mask for this thread | |
762 os::Linux::hotspot_sigmask(thread); | |
763 | |
764 // initialize floating point control register | |
765 os::Linux::init_thread_fpu_state(); | |
766 | |
767 // handshaking with parent thread | |
768 { | |
769 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
770 | |
771 // notify parent thread | |
772 osthread->set_state(INITIALIZED); | |
773 sync->notify_all(); | |
774 | |
775 // wait until os::start_thread() | |
776 while (osthread->get_state() == INITIALIZED) { | |
777 sync->wait(Mutex::_no_safepoint_check_flag); | |
778 } | |
779 } | |
780 | |
781 // call one more level start routine | |
782 thread->run(); | |
783 | |
784 return 0; | |
785 } | |
786 | |
787 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
788 assert(thread->osthread() == NULL, "caller responsible"); | |
789 | |
790 // Allocate the OSThread object | |
791 OSThread* osthread = new OSThread(NULL, NULL); | |
792 if (osthread == NULL) { | |
793 return false; | |
794 } | |
795 | |
796 // set the correct thread state | |
797 osthread->set_thread_type(thr_type); | |
798 | |
799 // Initial state is ALLOCATED but not INITIALIZED | |
800 osthread->set_state(ALLOCATED); | |
801 | |
802 thread->set_osthread(osthread); | |
803 | |
804 // init thread attributes | |
805 pthread_attr_t attr; | |
806 pthread_attr_init(&attr); | |
807 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
808 | |
809 // stack size | |
810 if (os::Linux::supports_variable_stack_size()) { | |
811 // calculate stack size if it's not specified by caller | |
812 if (stack_size == 0) { | |
813 stack_size = os::Linux::default_stack_size(thr_type); | |
814 | |
815 switch (thr_type) { | |
816 case os::java_thread: | |
1867
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817 // Java threads use ThreadStackSize which default value can be |
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818 // changed with the flag -Xss |
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819 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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820 stack_size = JavaThread::stack_size_at_create(); |
0 | 821 break; |
822 case os::compiler_thread: | |
823 if (CompilerThreadStackSize > 0) { | |
824 stack_size = (size_t)(CompilerThreadStackSize * K); | |
825 break; | |
826 } // else fall through: | |
827 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
828 case os::vm_thread: | |
829 case os::pgc_thread: | |
830 case os::cgc_thread: | |
831 case os::watcher_thread: | |
832 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
833 break; | |
834 } | |
835 } | |
836 | |
837 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
838 pthread_attr_setstacksize(&attr, stack_size); | |
839 } else { | |
840 // let pthread_create() pick the default value. | |
841 } | |
842 | |
843 // glibc guard page | |
844 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
845 | |
846 ThreadState state; | |
847 | |
848 { | |
849 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
850 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
851 if (lock) { | |
852 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
853 } | |
854 | |
855 pthread_t tid; | |
856 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
857 | |
858 pthread_attr_destroy(&attr); | |
859 | |
860 if (ret != 0) { | |
861 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
862 perror("pthread_create()"); | |
863 } | |
864 // Need to clean up stuff we've allocated so far | |
865 thread->set_osthread(NULL); | |
866 delete osthread; | |
867 if (lock) os::Linux::createThread_lock()->unlock(); | |
868 return false; | |
869 } | |
870 | |
871 // Store pthread info into the OSThread | |
872 osthread->set_pthread_id(tid); | |
873 | |
874 // Wait until child thread is either initialized or aborted | |
875 { | |
876 Monitor* sync_with_child = osthread->startThread_lock(); | |
877 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
878 while ((state = osthread->get_state()) == ALLOCATED) { | |
879 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
880 } | |
881 } | |
882 | |
883 if (lock) { | |
884 os::Linux::createThread_lock()->unlock(); | |
885 } | |
886 } | |
887 | |
888 // Aborted due to thread limit being reached | |
889 if (state == ZOMBIE) { | |
890 thread->set_osthread(NULL); | |
891 delete osthread; | |
892 return false; | |
893 } | |
894 | |
895 // The thread is returned suspended (in state INITIALIZED), | |
896 // and is started higher up in the call chain | |
897 assert(state == INITIALIZED, "race condition"); | |
898 return true; | |
899 } | |
900 | |
901 ///////////////////////////////////////////////////////////////////////////// | |
902 // attach existing thread | |
903 | |
904 // bootstrap the main thread | |
905 bool os::create_main_thread(JavaThread* thread) { | |
906 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
907 return create_attached_thread(thread); | |
908 } | |
909 | |
910 bool os::create_attached_thread(JavaThread* thread) { | |
911 #ifdef ASSERT | |
912 thread->verify_not_published(); | |
913 #endif | |
914 | |
915 // Allocate the OSThread object | |
916 OSThread* osthread = new OSThread(NULL, NULL); | |
917 | |
918 if (osthread == NULL) { | |
919 return false; | |
920 } | |
921 | |
922 // Store pthread info into the OSThread | |
923 osthread->set_thread_id(os::Linux::gettid()); | |
924 osthread->set_pthread_id(::pthread_self()); | |
925 | |
926 // initialize floating point control register | |
927 os::Linux::init_thread_fpu_state(); | |
928 | |
929 // Initial thread state is RUNNABLE | |
930 osthread->set_state(RUNNABLE); | |
931 | |
932 thread->set_osthread(osthread); | |
933 | |
934 if (UseNUMA) { | |
935 int lgrp_id = os::numa_get_group_id(); | |
936 if (lgrp_id != -1) { | |
937 thread->set_lgrp_id(lgrp_id); | |
938 } | |
939 } | |
940 | |
941 if (os::Linux::is_initial_thread()) { | |
942 // If current thread is initial thread, its stack is mapped on demand, | |
943 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
944 // the entire stack region to avoid SEGV in stack banging. | |
945 // It is also useful to get around the heap-stack-gap problem on SuSE | |
946 // kernel (see 4821821 for details). We first expand stack to the top | |
947 // of yellow zone, then enable stack yellow zone (order is significant, | |
948 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
949 // is no gap between the last two virtual memory regions. | |
950 | |
951 JavaThread *jt = (JavaThread *)thread; | |
952 address addr = jt->stack_yellow_zone_base(); | |
953 assert(addr != NULL, "initialization problem?"); | |
954 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
955 | |
956 osthread->set_expanding_stack(); | |
957 os::Linux::manually_expand_stack(jt, addr); | |
958 osthread->clear_expanding_stack(); | |
959 } | |
960 | |
961 // initialize signal mask for this thread | |
962 // and save the caller's signal mask | |
963 os::Linux::hotspot_sigmask(thread); | |
964 | |
965 return true; | |
966 } | |
967 | |
968 void os::pd_start_thread(Thread* thread) { | |
969 OSThread * osthread = thread->osthread(); | |
970 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
971 Monitor* sync_with_child = osthread->startThread_lock(); | |
972 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
973 sync_with_child->notify(); | |
974 } | |
975 | |
976 // Free Linux resources related to the OSThread | |
977 void os::free_thread(OSThread* osthread) { | |
978 assert(osthread != NULL, "osthread not set"); | |
979 | |
980 if (Thread::current()->osthread() == osthread) { | |
981 // Restore caller's signal mask | |
982 sigset_t sigmask = osthread->caller_sigmask(); | |
983 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
984 } | |
985 | |
986 delete osthread; | |
987 } | |
988 | |
989 ////////////////////////////////////////////////////////////////////////////// | |
990 // thread local storage | |
991 | |
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992 // Restore the thread pointer if the destructor is called. This is in case |
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993 // someone from JNI code sets up a destructor with pthread_key_create to run |
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994 // detachCurrentThread on thread death. Unless we restore the thread pointer we |
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995 // will hang or crash. When detachCurrentThread is called the key will be set |
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996 // to null and we will not be called again. If detachCurrentThread is never |
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997 // called we could loop forever depending on the pthread implementation. |
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998 static void restore_thread_pointer(void* p) { |
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999 Thread* thread = (Thread*) p; |
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1000 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); |
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1001 } |
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1002 |
0 | 1003 int os::allocate_thread_local_storage() { |
1004 pthread_key_t key; | |
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1005 int rslt = pthread_key_create(&key, restore_thread_pointer); |
0 | 1006 assert(rslt == 0, "cannot allocate thread local storage"); |
1007 return (int)key; | |
1008 } | |
1009 | |
1010 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1011 // on VM exit. | |
1012 void os::free_thread_local_storage(int index) { | |
1013 int rslt = pthread_key_delete((pthread_key_t)index); | |
1014 assert(rslt == 0, "invalid index"); | |
1015 } | |
1016 | |
1017 void os::thread_local_storage_at_put(int index, void* value) { | |
1018 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1019 assert(rslt == 0, "pthread_setspecific failed"); | |
1020 } | |
1021 | |
1022 extern "C" Thread* get_thread() { | |
1023 return ThreadLocalStorage::thread(); | |
1024 } | |
1025 | |
1026 ////////////////////////////////////////////////////////////////////////////// | |
1027 // initial thread | |
1028 | |
1029 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1030 bool os::Linux::is_initial_thread(void) { | |
1031 char dummy; | |
1032 // If called before init complete, thread stack bottom will be null. | |
1033 // Can be called if fatal error occurs before initialization. | |
1034 if (initial_thread_stack_bottom() == NULL) return false; | |
1035 assert(initial_thread_stack_bottom() != NULL && | |
1036 initial_thread_stack_size() != 0, | |
1037 "os::init did not locate initial thread's stack region"); | |
1038 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1039 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1040 return true; | |
1041 else return false; | |
1042 } | |
1043 | |
1044 // Find the virtual memory area that contains addr | |
1045 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1046 FILE *fp = fopen("/proc/self/maps", "r"); | |
1047 if (fp) { | |
1048 address low, high; | |
1049 while (!feof(fp)) { | |
1050 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1051 if (low <= addr && addr < high) { | |
1052 if (vma_low) *vma_low = low; | |
1053 if (vma_high) *vma_high = high; | |
1054 fclose (fp); | |
1055 return true; | |
1056 } | |
1057 } | |
1058 for (;;) { | |
1059 int ch = fgetc(fp); | |
1060 if (ch == EOF || ch == (int)'\n') break; | |
1061 } | |
1062 } | |
1063 fclose(fp); | |
1064 } | |
1065 return false; | |
1066 } | |
1067 | |
1068 // Locate initial thread stack. This special handling of initial thread stack | |
1069 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1070 // bogus value for initial thread. | |
1071 void os::Linux::capture_initial_stack(size_t max_size) { | |
1072 // stack size is the easy part, get it from RLIMIT_STACK | |
1073 size_t stack_size; | |
1074 struct rlimit rlim; | |
1075 getrlimit(RLIMIT_STACK, &rlim); | |
1076 stack_size = rlim.rlim_cur; | |
1077 | |
1078 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1079 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1080 // so we won't install guard page on ld.so's data section. | |
1081 stack_size -= 2 * page_size(); | |
1082 | |
1083 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1084 // 7.1, in both cases we will get 2G in return value. | |
1085 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1086 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1087 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1088 // in case other parts in glibc still assumes 2M max stack size. | |
1089 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1090 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1091 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1092 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1093 // Try to figure out where the stack base (top) is. This is harder. |
1094 // | |
1095 // When an application is started, glibc saves the initial stack pointer in | |
1096 // a global variable "__libc_stack_end", which is then used by system | |
1097 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1098 // variable is available since the very early days. However, because it is | |
1099 // a private interface, it could disappear in the future. | |
1100 // | |
1101 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1102 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1103 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1104 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1105 // /proc/<pid>/stat could change in the future (though unlikely). | |
1106 // | |
1107 // We try __libc_stack_end first. If that doesn't work, look for | |
1108 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1109 // as a hint, which should work well in most cases. | |
1110 | |
1111 uintptr_t stack_start; | |
1112 | |
1113 // try __libc_stack_end first | |
1114 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1115 if (p && *p) { | |
1116 stack_start = *p; | |
1117 } else { | |
1118 // see if we can get the start_stack field from /proc/self/stat | |
1119 FILE *fp; | |
1120 int pid; | |
1121 char state; | |
1122 int ppid; | |
1123 int pgrp; | |
1124 int session; | |
1125 int nr; | |
1126 int tpgrp; | |
1127 unsigned long flags; | |
1128 unsigned long minflt; | |
1129 unsigned long cminflt; | |
1130 unsigned long majflt; | |
1131 unsigned long cmajflt; | |
1132 unsigned long utime; | |
1133 unsigned long stime; | |
1134 long cutime; | |
1135 long cstime; | |
1136 long prio; | |
1137 long nice; | |
1138 long junk; | |
1139 long it_real; | |
1140 uintptr_t start; | |
1141 uintptr_t vsize; | |
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1142 intptr_t rss; |
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1143 uintptr_t rsslim; |
0 | 1144 uintptr_t scodes; |
1145 uintptr_t ecode; | |
1146 int i; | |
1147 | |
1148 // Figure what the primordial thread stack base is. Code is inspired | |
1149 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1150 // followed by command name surrounded by parentheses, state, etc. | |
1151 char stat[2048]; | |
1152 int statlen; | |
1153 | |
1154 fp = fopen("/proc/self/stat", "r"); | |
1155 if (fp) { | |
1156 statlen = fread(stat, 1, 2047, fp); | |
1157 stat[statlen] = '\0'; | |
1158 fclose(fp); | |
1159 | |
1160 // Skip pid and the command string. Note that we could be dealing with | |
1161 // weird command names, e.g. user could decide to rename java launcher | |
1162 // to "java 1.4.2 :)", then the stat file would look like | |
1163 // 1234 (java 1.4.2 :)) R ... ... | |
1164 // We don't really need to know the command string, just find the last | |
1165 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1166 char * s = strrchr(stat, ')'); | |
1167 | |
1168 i = 0; | |
1169 if (s) { | |
1170 // Skip blank chars | |
1171 do s++; while (isspace(*s)); | |
1172 | |
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1173 #define _UFM UINTX_FORMAT |
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1174 #define _DFM INTX_FORMAT |
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1175 |
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1176 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1177 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ |
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1178 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, |
0 | 1179 &state, /* 3 %c */ |
1180 &ppid, /* 4 %d */ | |
1181 &pgrp, /* 5 %d */ | |
1182 &session, /* 6 %d */ | |
1183 &nr, /* 7 %d */ | |
1184 &tpgrp, /* 8 %d */ | |
1185 &flags, /* 9 %lu */ | |
1186 &minflt, /* 10 %lu */ | |
1187 &cminflt, /* 11 %lu */ | |
1188 &majflt, /* 12 %lu */ | |
1189 &cmajflt, /* 13 %lu */ | |
1190 &utime, /* 14 %lu */ | |
1191 &stime, /* 15 %lu */ | |
1192 &cutime, /* 16 %ld */ | |
1193 &cstime, /* 17 %ld */ | |
1194 &prio, /* 18 %ld */ | |
1195 &nice, /* 19 %ld */ | |
1196 &junk, /* 20 %ld */ | |
1197 &it_real, /* 21 %ld */ | |
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1198 &start, /* 22 UINTX_FORMAT */ |
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1199 &vsize, /* 23 UINTX_FORMAT */ |
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1200 &rss, /* 24 INTX_FORMAT */ |
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1201 &rsslim, /* 25 UINTX_FORMAT */ |
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1202 &scodes, /* 26 UINTX_FORMAT */ |
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1203 &ecode, /* 27 UINTX_FORMAT */ |
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1204 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1205 } |
1206 | |
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1207 #undef _UFM |
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1208 #undef _DFM |
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1209 |
0 | 1210 if (i != 28 - 2) { |
1211 assert(false, "Bad conversion from /proc/self/stat"); | |
1212 // product mode - assume we are the initial thread, good luck in the | |
1213 // embedded case. | |
1214 warning("Can't detect initial thread stack location - bad conversion"); | |
1215 stack_start = (uintptr_t) &rlim; | |
1216 } | |
1217 } else { | |
1218 // For some reason we can't open /proc/self/stat (for example, running on | |
1219 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1220 // most cases, so don't abort: | |
1221 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1222 stack_start = (uintptr_t) &rlim; | |
1223 } | |
1224 } | |
1225 | |
1226 // Now we have a pointer (stack_start) very close to the stack top, the | |
1227 // next thing to do is to figure out the exact location of stack top. We | |
1228 // can find out the virtual memory area that contains stack_start by | |
1229 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1230 // and its upper limit is the real stack top. (again, this would fail if | |
1231 // running inside chroot, because /proc may not exist.) | |
1232 | |
1233 uintptr_t stack_top; | |
1234 address low, high; | |
1235 if (find_vma((address)stack_start, &low, &high)) { | |
1236 // success, "high" is the true stack top. (ignore "low", because initial | |
1237 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1238 stack_top = (uintptr_t)high; | |
1239 } else { | |
1240 // failed, likely because /proc/self/maps does not exist | |
1241 warning("Can't detect initial thread stack location - find_vma failed"); | |
1242 // best effort: stack_start is normally within a few pages below the real | |
1243 // stack top, use it as stack top, and reduce stack size so we won't put | |
1244 // guard page outside stack. | |
1245 stack_top = stack_start; | |
1246 stack_size -= 16 * page_size(); | |
1247 } | |
1248 | |
1249 // stack_top could be partially down the page so align it | |
1250 stack_top = align_size_up(stack_top, page_size()); | |
1251 | |
1252 if (max_size && stack_size > max_size) { | |
1253 _initial_thread_stack_size = max_size; | |
1254 } else { | |
1255 _initial_thread_stack_size = stack_size; | |
1256 } | |
1257 | |
1258 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1259 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1260 } | |
1261 | |
1262 //////////////////////////////////////////////////////////////////////////////// | |
1263 // time support | |
1264 | |
1265 // Time since start-up in seconds to a fine granularity. | |
1266 // Used by VMSelfDestructTimer and the MemProfiler. | |
1267 double os::elapsedTime() { | |
1268 | |
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1269 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution |
0 | 1270 } |
1271 | |
1272 jlong os::elapsed_counter() { | |
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1273 return javaTimeNanos() - initial_time_count; |
0 | 1274 } |
1275 | |
1276 jlong os::elapsed_frequency() { | |
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1277 return NANOSECS_PER_SEC; // nanosecond resolution |
0 | 1278 } |
1279 | |
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1280 bool os::supports_vtime() { return true; } |
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1281 bool os::enable_vtime() { return false; } |
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1282 bool os::vtime_enabled() { return false; } |
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1283 |
342
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1284 double os::elapsedVTime() { |
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1285 struct rusage usage; |
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1286 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1287 if (retval == 0) { |
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1288 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000); |
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1289 } else { |
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1290 // better than nothing, but not much |
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1291 return elapsedTime(); |
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1292 } |
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1293 } |
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1294 |
61 | 1295 jlong os::javaTimeMillis() { |
0 | 1296 timeval time; |
1297 int status = gettimeofday(&time, NULL); | |
1298 assert(status != -1, "linux error"); | |
1299 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1300 } | |
1301 | |
1302 #ifndef CLOCK_MONOTONIC | |
1303 #define CLOCK_MONOTONIC (1) | |
1304 #endif | |
1305 | |
1306 void os::Linux::clock_init() { | |
1307 // we do dlopen's in this particular order due to bug in linux | |
1308 // dynamical loader (see 6348968) leading to crash on exit | |
1309 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1310 if (handle == NULL) { | |
1311 handle = dlopen("librt.so", RTLD_LAZY); | |
1312 } | |
1313 | |
1314 if (handle) { | |
1315 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1316 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1317 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1318 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1319 if (clock_getres_func && clock_gettime_func) { | |
1320 // See if monotonic clock is supported by the kernel. Note that some | |
1321 // early implementations simply return kernel jiffies (updated every | |
1322 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1323 // for nano time (though the monotonic property is still nice to have). | |
1324 // It's fixed in newer kernels, however clock_getres() still returns | |
1325 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1326 // resolution for now. Hopefully as people move to new kernels, this | |
1327 // won't be a problem. | |
1328 struct timespec res; | |
1329 struct timespec tp; | |
1330 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1331 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1332 // yes, monotonic clock is supported | |
1333 _clock_gettime = clock_gettime_func; | |
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1334 return; |
0 | 1335 } else { |
1336 // close librt if there is no monotonic clock | |
1337 dlclose(handle); | |
1338 } | |
1339 } | |
1340 } | |
12211
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1341 warning("No monotonic clock was available - timed services may " \ |
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1342 "be adversely affected if the time-of-day clock changes"); |
0 | 1343 } |
1344 | |
1345 #ifndef SYS_clock_getres | |
1346 | |
1347 #if defined(IA32) || defined(AMD64) | |
1348 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1349 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1350 #else |
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1351 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1352 #define sys_clock_getres(x,y) -1 |
0 | 1353 #endif |
1354 | |
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1355 #else |
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1356 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1357 #endif |
1358 | |
1359 void os::Linux::fast_thread_clock_init() { | |
1360 if (!UseLinuxPosixThreadCPUClocks) { | |
1361 return; | |
1362 } | |
1363 clockid_t clockid; | |
1364 struct timespec tp; | |
1365 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1366 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1367 | |
1368 // Switch to using fast clocks for thread cpu time if | |
1369 // the sys_clock_getres() returns 0 error code. | |
1370 // Note, that some kernels may support the current thread | |
1371 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1372 // returned by the pthread_getcpuclockid(). | |
1373 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1374 // must return at least tp.tv_sec == 0 which means a resolution | |
1375 // better than 1 sec. This is extra check for reliability. | |
1376 | |
1377 if(pthread_getcpuclockid_func && | |
1378 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1379 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1380 | |
1381 _supports_fast_thread_cpu_time = true; | |
1382 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1383 } | |
1384 } | |
1385 | |
1386 jlong os::javaTimeNanos() { | |
1387 if (Linux::supports_monotonic_clock()) { | |
1388 struct timespec tp; | |
1389 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1390 assert(status == 0, "gettime error"); | |
1391 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1392 return result; | |
1393 } else { | |
1394 timeval time; | |
1395 int status = gettimeofday(&time, NULL); | |
1396 assert(status != -1, "linux error"); | |
1397 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1398 return 1000 * usecs; | |
1399 } | |
1400 } | |
1401 | |
1402 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1403 if (Linux::supports_monotonic_clock()) { | |
1404 info_ptr->max_value = ALL_64_BITS; | |
1405 | |
1406 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1407 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1408 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1409 } else { | |
1410 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1411 info_ptr->max_value = ALL_64_BITS; | |
1412 | |
1413 // gettimeofday is a real time clock so it skips | |
1414 info_ptr->may_skip_backward = true; | |
1415 info_ptr->may_skip_forward = true; | |
1416 } | |
1417 | |
1418 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1419 } | |
1420 | |
1421 // Return the real, user, and system times in seconds from an | |
1422 // arbitrary fixed point in the past. | |
1423 bool os::getTimesSecs(double* process_real_time, | |
1424 double* process_user_time, | |
1425 double* process_system_time) { | |
1426 struct tms ticks; | |
1427 clock_t real_ticks = times(&ticks); | |
1428 | |
1429 if (real_ticks == (clock_t) (-1)) { | |
1430 return false; | |
1431 } else { | |
1432 double ticks_per_second = (double) clock_tics_per_sec; | |
1433 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1434 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1435 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1436 | |
1437 return true; | |
1438 } | |
1439 } | |
1440 | |
1441 | |
1442 char * os::local_time_string(char *buf, size_t buflen) { | |
1443 struct tm t; | |
1444 time_t long_time; | |
1445 time(&long_time); | |
1446 localtime_r(&long_time, &t); | |
1447 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1448 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1449 t.tm_hour, t.tm_min, t.tm_sec); | |
1450 return buf; | |
1451 } | |
1452 | |
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1453 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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|
1454 return localtime_r(clock, res); |
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|
1455 } |
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|
1456 |
0 | 1457 //////////////////////////////////////////////////////////////////////////////// |
1458 // runtime exit support | |
1459 | |
1460 // Note: os::shutdown() might be called very early during initialization, or | |
1461 // called from signal handler. Before adding something to os::shutdown(), make | |
1462 // sure it is async-safe and can handle partially initialized VM. | |
1463 void os::shutdown() { | |
1464 | |
1465 // allow PerfMemory to attempt cleanup of any persistent resources | |
1466 perfMemory_exit(); | |
1467 | |
1468 // needs to remove object in file system | |
1469 AttachListener::abort(); | |
1470 | |
1471 // flush buffered output, finish log files | |
1472 ostream_abort(); | |
1473 | |
1474 // Check for abort hook | |
1475 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1476 if (abort_hook != NULL) { | |
1477 abort_hook(); | |
1478 } | |
1479 | |
1480 } | |
1481 | |
1482 // Note: os::abort() might be called very early during initialization, or | |
1483 // called from signal handler. Before adding something to os::abort(), make | |
1484 // sure it is async-safe and can handle partially initialized VM. | |
1485 void os::abort(bool dump_core) { | |
1486 os::shutdown(); | |
1487 if (dump_core) { | |
1488 #ifndef PRODUCT | |
1489 fdStream out(defaultStream::output_fd()); | |
1490 out.print_raw("Current thread is "); | |
1491 char buf[16]; | |
1492 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1493 out.print_raw_cr(buf); | |
1494 out.print_raw_cr("Dumping core ..."); | |
1495 #endif | |
1496 ::abort(); // dump core | |
1497 } | |
1498 | |
1499 ::exit(1); | |
1500 } | |
1501 | |
1502 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1503 void os::die() { | |
1504 // _exit() on LinuxThreads only kills current thread | |
1505 ::abort(); | |
1506 } | |
1507 | |
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1508 |
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|
1509 // This method is a copy of JDK's sysGetLastErrorString |
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1510 // from src/solaris/hpi/src/system_md.c |
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|
1511 |
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|
1512 size_t os::lasterror(char *buf, size_t len) { |
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|
1513 |
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|
1514 if (errno == 0) return 0; |
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|
1515 |
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|
1516 const char *s = ::strerror(errno); |
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|
1517 size_t n = ::strlen(s); |
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|
1518 if (n >= len) { |
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|
1519 n = len - 1; |
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|
1520 } |
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|
1521 ::strncpy(buf, s, n); |
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|
1522 buf[n] = '\0'; |
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|
1523 return n; |
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|
1524 } |
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|
1525 |
0 | 1526 intx os::current_thread_id() { return (intx)pthread_self(); } |
1527 int os::current_process_id() { | |
1528 | |
1529 // Under the old linux thread library, linux gives each thread | |
1530 // its own process id. Because of this each thread will return | |
1531 // a different pid if this method were to return the result | |
1532 // of getpid(2). Linux provides no api that returns the pid | |
1533 // of the launcher thread for the vm. This implementation | |
1534 // returns a unique pid, the pid of the launcher thread | |
1535 // that starts the vm 'process'. | |
1536 | |
1537 // Under the NPTL, getpid() returns the same pid as the | |
1538 // launcher thread rather than a unique pid per thread. | |
1539 // Use gettid() if you want the old pre NPTL behaviour. | |
1540 | |
1541 // if you are looking for the result of a call to getpid() that | |
1542 // returns a unique pid for the calling thread, then look at the | |
1543 // OSThread::thread_id() method in osThread_linux.hpp file | |
1544 | |
1545 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1546 } | |
1547 | |
1548 // DLL functions | |
1549 | |
1550 const char* os::dll_file_extension() { return ".so"; } | |
1551 | |
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|
1552 // This must be hard coded because it's the system's temporary |
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|
1553 // directory not the java application's temp directory, ala java.io.tmpdir. |
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|
1554 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1555 |
691 | 1556 static bool file_exists(const char* filename) { |
1557 struct stat statbuf; | |
1558 if (filename == NULL || strlen(filename) == 0) { | |
1559 return false; | |
1560 } | |
1561 return os::stat(filename, &statbuf) == 0; | |
1562 } | |
1563 | |
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|
1564 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1565 const char* pname, const char* fname) { |
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|
1566 bool retval = false; |
691 | 1567 // Copied from libhpi |
242 | 1568 const size_t pnamelen = pname ? strlen(pname) : 0; |
1569 | |
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1570 // Return error on buffer overflow. |
242 | 1571 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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|
1572 return retval; |
242 | 1573 } |
1574 | |
1575 if (pnamelen == 0) { | |
691 | 1576 snprintf(buffer, buflen, "lib%s.so", fname); |
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|
1577 retval = true; |
691 | 1578 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1579 int n; | |
1580 char** pelements = split_path(pname, &n); | |
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|
1581 if (pelements == NULL) { |
9062 | 1582 return false; |
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|
1583 } |
691 | 1584 for (int i = 0 ; i < n ; i++) { |
1585 // Really shouldn't be NULL, but check can't hurt | |
1586 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1587 continue; // skip the empty path values | |
1588 } | |
1589 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1590 if (file_exists(buffer)) { | |
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|
1591 retval = true; |
691 | 1592 break; |
1593 } | |
1594 } | |
1595 // release the storage | |
1596 for (int i = 0 ; i < n ; i++) { | |
1597 if (pelements[i] != NULL) { | |
6197 | 1598 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1599 } |
1600 } | |
1601 if (pelements != NULL) { | |
6197 | 1602 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1603 } |
242 | 1604 } else { |
691 | 1605 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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|
1606 retval = true; |
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|
1607 } |
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|
1608 return retval; |
242 | 1609 } |
1610 | |
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|
1611 // check if addr is inside libjvm.so |
0 | 1612 bool os::address_is_in_vm(address addr) { |
1613 static address libjvm_base_addr; | |
1614 Dl_info dlinfo; | |
1615 | |
1616 if (libjvm_base_addr == NULL) { | |
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1617 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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|
1618 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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|
1619 } |
0 | 1620 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1621 } | |
1622 | |
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|
1623 if (dladdr((void *)addr, &dlinfo) != 0) { |
0 | 1624 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1625 } | |
1626 | |
1627 return false; | |
1628 } | |
1629 | |
1630 bool os::dll_address_to_function_name(address addr, char *buf, | |
1631 int buflen, int *offset) { | |
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|
1632 // buf is not optional, but offset is optional |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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|
1633 assert(buf != NULL, "sanity check"); |
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|
1634 |
0 | 1635 Dl_info dlinfo; |
1636 | |
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|
1637 if (dladdr((void*)addr, &dlinfo) != 0) { |
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|
1638 // see if we have a matching symbol |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
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|
1639 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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1640 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
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|
1641 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
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|
1642 } |
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59b052799158
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|
1643 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
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|
1644 return true; |
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|
1645 } |
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|
1646 // no matching symbol so try for just file info |
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|
1647 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
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10986
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|
1648 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
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10986
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|
1649 buf, buflen, offset, dlinfo.dli_fname)) { |
59b052799158
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10986
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|
1650 return true; |
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|
1651 } |
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|
1652 } |
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59b052799158
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|
1653 } |
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|
1654 |
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|
1655 buf[0] = '\0'; |
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|
1656 if (offset != NULL) *offset = -1; |
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|
1657 return false; |
0 | 1658 } |
1659 | |
1660 struct _address_to_library_name { | |
1661 address addr; // input : memory address | |
1662 size_t buflen; // size of fname | |
1663 char* fname; // output: library name | |
1664 address base; // library base addr | |
1665 }; | |
1666 | |
1667 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1668 size_t size, void *data) { | |
1669 int i; | |
1670 bool found = false; | |
1671 address libbase = NULL; | |
1672 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1673 | |
1674 // iterate through all loadable segments | |
1675 for (i = 0; i < info->dlpi_phnum; i++) { | |
1676 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1677 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1678 // base address of a library is the lowest address of its loaded | |
1679 // segments. | |
1680 if (libbase == NULL || libbase > segbase) { | |
1681 libbase = segbase; | |
1682 } | |
1683 // see if 'addr' is within current segment | |
1684 if (segbase <= d->addr && | |
1685 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1686 found = true; | |
1687 } | |
1688 } | |
1689 } | |
1690 | |
1691 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1692 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1693 // can figure out executable name from argv[0]. | |
1694 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1695 d->base = libbase; | |
1696 if (d->fname) { | |
1697 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1698 } | |
1699 return 1; | |
1700 } | |
1701 return 0; | |
1702 } | |
1703 | |
1704 bool os::dll_address_to_library_name(address addr, char* buf, | |
1705 int buflen, int* offset) { | |
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|
1706 // buf is not optional, but offset is optional |
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|
1707 assert(buf != NULL, "sanity check"); |
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|
1708 |
0 | 1709 Dl_info dlinfo; |
1710 struct _address_to_library_name data; | |
1711 | |
1712 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1713 // to wrong library name if the .so file has a base address != NULL. Here | |
1714 // we iterate through the program headers of all loaded libraries to find | |
1715 // out which library 'addr' really belongs to. This workaround can be | |
1716 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1717 data.addr = addr; | |
1718 data.fname = buf; | |
1719 data.buflen = buflen; | |
1720 data.base = NULL; | |
1721 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1722 | |
1723 if (rslt) { | |
1724 // buf already contains library name | |
1725 if (offset) *offset = addr - data.base; | |
1726 return true; | |
11092
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1727 } |
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1728 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1729 if (dlinfo.dli_fname != NULL) { |
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1730 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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1731 } |
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1732 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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1733 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1734 } |
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1735 return true; |
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|
1736 } |
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|
1737 |
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1738 buf[0] = '\0'; |
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1739 if (offset) *offset = -1; |
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1740 return false; |
0 | 1741 } |
1742 | |
1743 // Loads .dll/.so and | |
1744 // in case of error it checks if .dll/.so was built for the | |
1745 // same architecture as Hotspot is running on | |
1746 | |
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1747 |
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1748 // Remember the stack's state. The Linux dynamic linker will change |
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1749 // the stack to 'executable' at most once, so we must safepoint only once. |
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1750 bool os::Linux::_stack_is_executable = false; |
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1751 |
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1752 // VM operation that loads a library. This is necessary if stack protection |
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1753 // of the Java stacks can be lost during loading the library. If we |
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1754 // do not stop the Java threads, they can stack overflow before the stacks |
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1755 // are protected again. |
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1756 class VM_LinuxDllLoad: public VM_Operation { |
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1757 private: |
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1758 const char *_filename; |
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1759 char *_ebuf; |
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1760 int _ebuflen; |
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1761 void *_lib; |
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1762 public: |
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1763 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1764 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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1765 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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1766 void doit() { |
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1767 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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1768 os::Linux::_stack_is_executable = true; |
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1769 } |
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1770 void* loaded_library() { return _lib; } |
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1771 }; |
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1772 |
0 | 1773 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1774 { | |
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1775 void * result = NULL; |
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1776 bool load_attempted = false; |
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1777 |
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1778 // Check whether the library to load might change execution rights |
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1779 // of the stack. If they are changed, the protection of the stack |
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1780 // guard pages will be lost. We need a safepoint to fix this. |
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1781 // |
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1782 // See Linux man page execstack(8) for more info. |
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1783 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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1784 ElfFile ef(filename); |
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1785 if (!ef.specifies_noexecstack()) { |
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1786 if (!is_init_completed()) { |
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1787 os::Linux::_stack_is_executable = true; |
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1788 // This is OK - No Java threads have been created yet, and hence no |
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1789 // stack guard pages to fix. |
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1790 // |
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1791 // This should happen only when you are building JDK7 using a very |
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1792 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1793 // |
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1794 // Dynamic loader will make all stacks executable after |
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1795 // this function returns, and will not do that again. |
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1796 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1797 } else { |
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1798 warning("You have loaded library %s which might have disabled stack guard. " |
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1799 "The VM will try to fix the stack guard now.\n" |
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1800 "It's highly recommended that you fix the library with " |
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1801 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1802 filename); |
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1803 |
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1804 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1805 JavaThread *jt = JavaThread::current(); |
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1806 if (jt->thread_state() != _thread_in_native) { |
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1807 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1808 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1809 warning("Unable to fix stack guard. Giving up."); |
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1810 } else { |
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1811 if (!LoadExecStackDllInVMThread) { |
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1812 // This is for the case where the DLL has an static |
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1813 // constructor function that executes JNI code. We cannot |
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1814 // load such DLLs in the VMThread. |
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1815 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1816 } |
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1817 |
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1818 ThreadInVMfromNative tiv(jt); |
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1819 debug_only(VMNativeEntryWrapper vew;) |
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1820 |
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1821 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1822 VMThread::execute(&op); |
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1823 if (LoadExecStackDllInVMThread) { |
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1824 result = op.loaded_library(); |
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|
1825 } |
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|
1826 load_attempted = true; |
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|
1827 } |
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|
1828 } |
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1829 } |
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|
1830 } |
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|
1831 |
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1832 if (!load_attempted) { |
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1833 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1834 } |
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1835 |
0 | 1836 if (result != NULL) { |
1837 // Successful loading | |
1838 return result; | |
1839 } | |
1840 | |
1841 Elf32_Ehdr elf_head; | |
1842 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1843 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1844 | |
1845 if (diag_msg_max_length==0) { | |
1846 // No more space in ebuf for additional diagnostics message | |
1847 return NULL; | |
1848 } | |
1849 | |
1850 | |
1851 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1852 | |
1853 if (file_descriptor < 0) { | |
1854 // Can't open library, report dlerror() message | |
1855 return NULL; | |
1856 } | |
1857 | |
1858 bool failed_to_read_elf_head= | |
1859 (sizeof(elf_head)!= | |
1860 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1861 | |
1862 ::close(file_descriptor); | |
1863 if (failed_to_read_elf_head) { | |
1864 // file i/o error - report dlerror() msg | |
1865 return NULL; | |
1866 } | |
1867 | |
1868 typedef struct { | |
1869 Elf32_Half code; // Actual value as defined in elf.h | |
1870 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1871 char elf_class; // 32 or 64 bit | |
1872 char endianess; // MSB or LSB | |
1873 char* name; // String representation | |
1874 } arch_t; | |
1875 | |
1876 #ifndef EM_486 | |
1877 #define EM_486 6 /* Intel 80486 */ | |
1878 #endif | |
1879 | |
1880 static const arch_t arch_array[]={ | |
1881 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1882 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1883 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1884 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1885 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1886 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1887 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1888 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
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1889 #if defined(VM_LITTLE_ENDIAN) |
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1890 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2LSB, (char*)"Power PC 64"}, |
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1891 #else |
1010 | 1892 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
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1893 #endif |
1010 | 1894 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, |
1895 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1896 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1897 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1898 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1899 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1900 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1901 }; |
1902 | |
1903 #if (defined IA32) | |
1904 static Elf32_Half running_arch_code=EM_386; | |
1905 #elif (defined AMD64) | |
1906 static Elf32_Half running_arch_code=EM_X86_64; | |
1907 #elif (defined IA64) | |
1908 static Elf32_Half running_arch_code=EM_IA_64; | |
1909 #elif (defined __sparc) && (defined _LP64) | |
1910 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1911 #elif (defined __sparc) && (!defined _LP64) | |
1912 static Elf32_Half running_arch_code=EM_SPARC; | |
1913 #elif (defined __powerpc64__) | |
1914 static Elf32_Half running_arch_code=EM_PPC64; | |
1915 #elif (defined __powerpc__) | |
1916 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1917 #elif (defined ARM) |
1918 static Elf32_Half running_arch_code=EM_ARM; | |
1919 #elif (defined S390) | |
1920 static Elf32_Half running_arch_code=EM_S390; | |
1921 #elif (defined ALPHA) | |
1922 static Elf32_Half running_arch_code=EM_ALPHA; | |
1923 #elif (defined MIPSEL) | |
1924 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1925 #elif (defined PARISC) | |
1926 static Elf32_Half running_arch_code=EM_PARISC; | |
1927 #elif (defined MIPS) | |
1928 static Elf32_Half running_arch_code=EM_MIPS; | |
1929 #elif (defined M68K) | |
1930 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1931 #else |
1932 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1933 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 1934 #endif |
1935 | |
1936 // Identify compatability class for VM's architecture and library's architecture | |
1937 // Obtain string descriptions for architectures | |
1938 | |
1939 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1940 int running_arch_index=-1; | |
1941 | |
1942 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1943 if (running_arch_code == arch_array[i].code) { | |
1944 running_arch_index = i; | |
1945 } | |
1946 if (lib_arch.code == arch_array[i].code) { | |
1947 lib_arch.compat_class = arch_array[i].compat_class; | |
1948 lib_arch.name = arch_array[i].name; | |
1949 } | |
1950 } | |
1951 | |
1952 assert(running_arch_index != -1, | |
1953 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1954 if (running_arch_index == -1) { | |
1955 // Even though running architecture detection failed | |
1956 // we may still continue with reporting dlerror() message | |
1957 return NULL; | |
1958 } | |
1959 | |
1960 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1961 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1962 return NULL; | |
1963 } | |
1964 | |
1010 | 1965 #ifndef S390 |
0 | 1966 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
1967 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1968 return NULL; | |
1969 } | |
1010 | 1970 #endif // !S390 |
0 | 1971 |
1972 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1973 if ( lib_arch.name!=NULL ) { | |
1974 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1975 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1976 lib_arch.name, arch_array[running_arch_index].name); | |
1977 } else { | |
1978 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1979 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1980 lib_arch.code, | |
1981 arch_array[running_arch_index].name); | |
1982 } | |
1983 } | |
1984 | |
1985 return NULL; | |
1986 } | |
1987 | |
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1988 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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1989 void * result = ::dlopen(filename, RTLD_LAZY); |
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1990 if (result == NULL) { |
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1991 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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1992 ebuf[ebuflen-1] = '\0'; |
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1993 } |
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1994 return result; |
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1995 } |
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1996 |
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1997 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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1998 void * result = NULL; |
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1999 if (LoadExecStackDllInVMThread) { |
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2000 result = dlopen_helper(filename, ebuf, ebuflen); |
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2001 } |
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2002 |
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2003 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2004 // library that requires an executable stack, or which does not have this |
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2005 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2006 // read protection of the guard pages gets lost. |
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2007 // |
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2008 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2009 // may have been queued at the same time. |
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2010 |
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2011 if (!_stack_is_executable) { |
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2012 JavaThread *jt = Threads::first(); |
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2013 |
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2014 while (jt) { |
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2015 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2016 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2017 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2018 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2019 warning("Attempt to reguard stack yellow zone failed."); |
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2020 } |
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2021 } |
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2022 jt = jt->next(); |
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2023 } |
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2024 } |
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2025 |
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2026 return result; |
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2027 } |
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2028 |
242 | 2029 /* |
2030 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2031 * chances are you might want to run the generated bits against glibc-2.0 | |
2032 * libdl.so, so always use locking for any version of glibc. | |
2033 */ | |
2034 void* os::dll_lookup(void* handle, const char* name) { | |
2035 pthread_mutex_lock(&dl_mutex); | |
2036 void* res = dlsym(handle, name); | |
2037 pthread_mutex_unlock(&dl_mutex); | |
2038 return res; | |
2039 } | |
0 | 2040 |
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2041 void* os::get_default_process_handle() { |
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2042 return (void*)::dlopen(NULL, RTLD_LAZY); |
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2043 } |
0 | 2044 |
1980
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2045 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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2046 int fd = ::open(filename, O_RDONLY); |
0 | 2047 if (fd == -1) { |
2048 return false; | |
2049 } | |
2050 | |
2051 char buf[32]; | |
2052 int bytes; | |
1980
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2053 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2054 st->print_raw(buf, bytes); |
2055 } | |
2056 | |
1980
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2057 ::close(fd); |
0 | 2058 |
2059 return true; | |
2060 } | |
2061 | |
2062 void os::print_dll_info(outputStream *st) { | |
2063 st->print_cr("Dynamic libraries:"); | |
2064 | |
2065 char fname[32]; | |
2066 pid_t pid = os::Linux::gettid(); | |
2067 | |
2068 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2069 | |
2070 if (!_print_ascii_file(fname, st)) { | |
2071 st->print("Can not get library information for pid = %d\n", pid); | |
2072 } | |
2073 } | |
2074 | |
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2075 void os::print_os_info_brief(outputStream* st) { |
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2076 os::Linux::print_distro_info(st); |
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2077 |
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2078 os::Posix::print_uname_info(st); |
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2079 |
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2080 os::Linux::print_libversion_info(st); |
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2081 |
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2082 } |
0 | 2083 |
2084 void os::print_os_info(outputStream* st) { | |
2085 st->print("OS:"); | |
2086 | |
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2087 os::Linux::print_distro_info(st); |
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2088 |
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2089 os::Posix::print_uname_info(st); |
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2090 |
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2091 // Print warning if unsafe chroot environment detected |
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2092 if (unsafe_chroot_detected) { |
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2093 st->print("WARNING!! "); |
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2094 st->print_cr("%s", unstable_chroot_error); |
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2095 } |
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2096 |
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2097 os::Linux::print_libversion_info(st); |
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2098 |
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2099 os::Posix::print_rlimit_info(st); |
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2100 |
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2101 os::Posix::print_load_average(st); |
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2102 |
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2103 os::Linux::print_full_memory_info(st); |
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2104 } |
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2105 |
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2106 // Try to identify popular distros. |
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2107 // Most Linux distributions have a /etc/XXX-release file, which contains |
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2108 // the OS version string. Newer Linux distributions have a /etc/lsb-release |
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2109 // file that also contains the OS version string. Some have more than one |
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2110 // /etc/XXX-release file (e.g. Mandrake has both /etc/mandrake-release and |
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2111 // /etc/redhat-release.), so the order is important. |
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2112 // Any Linux that is based on Redhat (i.e. Oracle, Mandrake, Sun JDS...) have |
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2113 // their own specific XXX-release file as well as a redhat-release file. |
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2114 // Because of this the XXX-release file needs to be searched for before the |
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2115 // redhat-release file. |
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2116 // Since Red Hat has a lsb-release file that is not very descriptive the |
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|
2117 // search for redhat-release needs to be before lsb-release. |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2118 // Since the lsb-release file is the new standard it needs to be searched |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2119 // before the older style release files. |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2120 // Searching system-release (Red Hat) and os-release (other Linuxes) are a |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2121 // next to last resort. The os-release file is a new standard that contains |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2122 // distribution information and the system-release file seems to be an old |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2123 // standard that has been replaced by the lsb-release and os-release files. |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2124 // Searching for the debian_version file is the last resort. It contains |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2125 // an informative string like "6.0.6" or "wheezy/sid". Because of this |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2126 // "Debian " is printed before the contents of the debian_version file. |
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|
2127 void os::Linux::print_distro_info(outputStream* st) { |
12212
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2128 if (!_print_ascii_file("/etc/oracle-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2129 !_print_ascii_file("/etc/mandriva-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2130 !_print_ascii_file("/etc/mandrake-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2131 !_print_ascii_file("/etc/sun-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2132 !_print_ascii_file("/etc/redhat-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2133 !_print_ascii_file("/etc/lsb-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2134 !_print_ascii_file("/etc/SuSE-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2135 !_print_ascii_file("/etc/turbolinux-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2136 !_print_ascii_file("/etc/gentoo-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2137 !_print_ascii_file("/etc/ltib-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2138 !_print_ascii_file("/etc/angstrom-version", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2139 !_print_ascii_file("/etc/system-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2140 !_print_ascii_file("/etc/os-release", st)) { |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2141 |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2142 if (file_exists("/etc/debian_version")) { |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2143 st->print("Debian "); |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2144 _print_ascii_file("/etc/debian_version", st); |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2145 } else { |
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|
2146 st->print("Linux"); |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2147 } |
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|
2148 } |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2149 st->cr(); |
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7165755: OS Information much longer on linux than other platforms
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|
2150 } |
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|
2151 |
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|
2152 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2153 // libc, pthread |
2154 st->print("libc:"); | |
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
2155 st->print("%s ", os::Linux::glibc_version()); |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
2156 st->print("%s ", os::Linux::libpthread_version()); |
0 | 2157 if (os::Linux::is_LinuxThreads()) { |
2158 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2159 } | |
2160 st->cr(); | |
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|
2161 } |
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|
2162 |
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|
2163 void os::Linux::print_full_memory_info(outputStream* st) { |
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|
2164 st->print("\n/proc/meminfo:\n"); |
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|
2165 _print_ascii_file("/proc/meminfo", st); |
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|
2166 st->cr(); |
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
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3358
diff
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|
2167 } |
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|
2168 |
0 | 2169 void os::print_memory_info(outputStream* st) { |
2170 | |
2171 st->print("Memory:"); | |
2172 st->print(" %dk page", os::vm_page_size()>>10); | |
2173 | |
2174 // values in struct sysinfo are "unsigned long" | |
2175 struct sysinfo si; | |
2176 sysinfo(&si); | |
2177 | |
2178 st->print(", physical " UINT64_FORMAT "k", | |
2179 os::physical_memory() >> 10); | |
2180 st->print("(" UINT64_FORMAT "k free)", | |
2181 os::available_memory() >> 10); | |
2182 st->print(", swap " UINT64_FORMAT "k", | |
2183 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2184 st->print("(" UINT64_FORMAT "k free)", | |
2185 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2186 st->cr(); | |
2187 } | |
2188 | |
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|
2189 void os::pd_print_cpu_info(outputStream* st) { |
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|
2190 st->print("\n/proc/cpuinfo:\n"); |
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|
2191 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
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|
2192 st->print(" <Not Available>"); |
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|
2193 } |
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|
2194 st->cr(); |
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|
2195 } |
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|
2196 |
0 | 2197 void os::print_siginfo(outputStream* st, void* siginfo) { |
14410 | 2198 const siginfo_t* si = (const siginfo_t*)siginfo; |
2199 | |
2200 os::Posix::print_siginfo_brief(st, si); | |
20375
6e0cb14ce59b
8046070: Class Data Sharing clean up and refactoring
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|
2201 #if INCLUDE_CDS |
14410 | 2202 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && |
0 | 2203 UseSharedSpaces) { |
2204 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2205 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2206 st->print("\n\nError accessing class data sharing archive." \ | |
2207 " Mapped file inaccessible during execution, " \ | |
2208 " possible disk/network problem."); | |
2209 } | |
2210 } | |
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8046070: Class Data Sharing clean up and refactoring
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|
2211 #endif |
0 | 2212 st->cr(); |
2213 } | |
2214 | |
2215 | |
2216 static void print_signal_handler(outputStream* st, int sig, | |
2217 char* buf, size_t buflen); | |
2218 | |
2219 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2220 st->print_cr("Signal Handlers:"); | |
2221 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2222 print_signal_handler(st, SIGBUS , buf, buflen); | |
2223 print_signal_handler(st, SIGFPE , buf, buflen); | |
2224 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2225 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2226 print_signal_handler(st, SIGILL , buf, buflen); | |
2227 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2228 print_signal_handler(st, SR_signum, buf, buflen); | |
2229 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2230 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2231 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2232 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
14432
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
goetz
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14422
diff
changeset
|
2233 #if defined(PPC64) |
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
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diff
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|
2234 print_signal_handler(st, SIGTRAP, buf, buflen); |
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|
2235 #endif |
0 | 2236 } |
2237 | |
2238 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2239 | |
7456
7d42f3b08300
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|
2240 // Find the full path to the current module, libjvm.so |
1642 | 2241 void os::jvm_path(char *buf, jint buflen) { |
0 | 2242 // Error checking. |
1642 | 2243 if (buflen < MAXPATHLEN) { |
0 | 2244 assert(false, "must use a large-enough buffer"); |
2245 buf[0] = '\0'; | |
2246 return; | |
2247 } | |
2248 // Lazy resolve the path to current module. | |
2249 if (saved_jvm_path[0] != 0) { | |
2250 strcpy(buf, saved_jvm_path); | |
2251 return; | |
2252 } | |
2253 | |
2254 char dli_fname[MAXPATHLEN]; | |
2255 bool ret = dll_address_to_library_name( | |
2256 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2257 dli_fname, sizeof(dli_fname), NULL); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
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|
2258 assert(ret, "cannot locate libjvm"); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
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|
2259 char *rp = NULL; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
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|
2260 if (ret && dli_fname[0] != '\0') { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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10986
diff
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|
2261 rp = realpath(dli_fname, buf); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
2262 } |
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126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
2263 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
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diff
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|
2264 return; |
0 | 2265 |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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parents:
2204
diff
changeset
|
2266 if (Arguments::created_by_gamma_launcher()) { |
0 | 2267 // Support for the gamma launcher. Typical value for buf is |
2268 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2269 // the right place in the string, then assume we are installed in a JDK and | |
2270 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2271 // up the path so it looks like libjvm.so is installed there (append a | |
2272 // fake suffix hotspot/libjvm.so). | |
2273 const char *p = buf + strlen(buf) - 1; | |
2274 for (int count = 0; p > buf && count < 5; ++count) { | |
2275 for (--p; p > buf && *p != '/'; --p) | |
2276 /* empty */ ; | |
2277 } | |
2278 | |
2279 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2280 // Look for JAVA_HOME in the environment. | |
2281 char* java_home_var = ::getenv("JAVA_HOME"); | |
2282 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2283 char* jrelib_p; |
2284 int len; | |
2285 | |
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|
2286 // Check the current module name "libjvm.so". |
0 | 2287 p = strrchr(buf, '/'); |
2288 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2289 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1642
diff
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|
2290 rp = realpath(java_home_var, buf); |
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diff
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|
2291 if (rp == NULL) |
513
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diff
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|
2292 return; |
1642 | 2293 |
2294 // determine if this is a legacy image or modules image | |
2295 // modules image doesn't have "jre" subdirectory | |
2296 len = strlen(buf); | |
17567 | 2297 assert(len < buflen, "Ran out of buffer room"); |
1642 | 2298 jrelib_p = buf + len; |
2299 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2300 if (0 != access(buf, F_OK)) { | |
2301 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2302 } | |
2303 | |
0 | 2304 if (0 == access(buf, F_OK)) { |
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|
2305 // Use current module name "libjvm.so" |
1642 | 2306 len = strlen(buf); |
7456
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dcubed
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7206
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|
2307 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2308 } else { |
2309 // Go back to path of .so | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
1642
diff
changeset
|
2310 rp = realpath(dli_fname, buf); |
126ea7725993
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1642
diff
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|
2311 if (rp == NULL) |
513
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diff
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|
2312 return; |
0 | 2313 } |
2314 } | |
2315 } | |
2316 } | |
2317 | |
17567 | 2318 strncpy(saved_jvm_path, buf, MAXPATHLEN); |
0 | 2319 } |
2320 | |
2321 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2322 // no prefix required, not even "_" | |
2323 } | |
2324 | |
2325 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2326 // no suffix required | |
2327 } | |
2328 | |
2329 //////////////////////////////////////////////////////////////////////////////// | |
2330 // sun.misc.Signal support | |
2331 | |
2332 static volatile jint sigint_count = 0; | |
2333 | |
2334 static void | |
2335 UserHandler(int sig, void *siginfo, void *context) { | |
2336 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2337 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2338 // don't want to flood the manager thread with sem_post requests. | |
2339 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2340 return; | |
2341 | |
2342 // Ctrl-C is pressed during error reporting, likely because the error | |
2343 // handler fails to abort. Let VM die immediately. | |
2344 if (sig == SIGINT && is_error_reported()) { | |
2345 os::die(); | |
2346 } | |
2347 | |
2348 os::signal_notify(sig); | |
2349 } | |
2350 | |
2351 void* os::user_handler() { | |
2352 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2353 } | |
2354 | |
10405 | 2355 class Semaphore : public StackObj { |
2356 public: | |
2357 Semaphore(); | |
2358 ~Semaphore(); | |
2359 void signal(); | |
2360 void wait(); | |
2361 bool trywait(); | |
2362 bool timedwait(unsigned int sec, int nsec); | |
2363 private: | |
2364 sem_t _semaphore; | |
2365 }; | |
2366 | |
2367 Semaphore::Semaphore() { | |
2368 sem_init(&_semaphore, 0, 0); | |
2369 } | |
2370 | |
2371 Semaphore::~Semaphore() { | |
2372 sem_destroy(&_semaphore); | |
2373 } | |
2374 | |
2375 void Semaphore::signal() { | |
2376 sem_post(&_semaphore); | |
2377 } | |
2378 | |
2379 void Semaphore::wait() { | |
2380 sem_wait(&_semaphore); | |
2381 } | |
2382 | |
2383 bool Semaphore::trywait() { | |
2384 return sem_trywait(&_semaphore) == 0; | |
2385 } | |
2386 | |
2387 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
17738 | 2388 |
10405 | 2389 struct timespec ts; |
17738 | 2390 // Semaphore's are always associated with CLOCK_REALTIME |
2391 os::Linux::clock_gettime(CLOCK_REALTIME, &ts); | |
2392 // see unpackTime for discussion on overflow checking | |
2393 if (sec >= MAX_SECS) { | |
2394 ts.tv_sec += MAX_SECS; | |
2395 ts.tv_nsec = 0; | |
2396 } else { | |
2397 ts.tv_sec += sec; | |
2398 ts.tv_nsec += nsec; | |
2399 if (ts.tv_nsec >= NANOSECS_PER_SEC) { | |
2400 ts.tv_nsec -= NANOSECS_PER_SEC; | |
2401 ++ts.tv_sec; // note: this must be <= max_secs | |
2402 } | |
2403 } | |
10405 | 2404 |
2405 while (1) { | |
2406 int result = sem_timedwait(&_semaphore, &ts); | |
2407 if (result == 0) { | |
2408 return true; | |
2409 } else if (errno == EINTR) { | |
2410 continue; | |
2411 } else if (errno == ETIMEDOUT) { | |
2412 return false; | |
2413 } else { | |
2414 return false; | |
2415 } | |
2416 } | |
2417 } | |
2418 | |
0 | 2419 extern "C" { |
2420 typedef void (*sa_handler_t)(int); | |
2421 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2422 } | |
2423 | |
2424 void* os::signal(int signal_number, void* handler) { | |
2425 struct sigaction sigAct, oldSigAct; | |
2426 | |
2427 sigfillset(&(sigAct.sa_mask)); | |
2428 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2429 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2430 | |
2431 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2432 // -1 means registration failed | |
2433 return (void *)-1; | |
2434 } | |
2435 | |
2436 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2437 } | |
2438 | |
2439 void os::signal_raise(int signal_number) { | |
2440 ::raise(signal_number); | |
2441 } | |
2442 | |
2443 /* | |
2444 * The following code is moved from os.cpp for making this | |
2445 * code platform specific, which it is by its very nature. | |
2446 */ | |
2447 | |
2448 // Will be modified when max signal is changed to be dynamic | |
2449 int os::sigexitnum_pd() { | |
2450 return NSIG; | |
2451 } | |
2452 | |
2453 // a counter for each possible signal value | |
2454 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2455 | |
2456 // Linux(POSIX) specific hand shaking semaphore. | |
2457 static sem_t sig_sem; | |
10405 | 2458 static Semaphore sr_semaphore; |
0 | 2459 |
2460 void os::signal_init_pd() { | |
2461 // Initialize signal structures | |
2462 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2463 | |
2464 // Initialize signal semaphore | |
2465 ::sem_init(&sig_sem, 0, 0); | |
2466 } | |
2467 | |
2468 void os::signal_notify(int sig) { | |
2469 Atomic::inc(&pending_signals[sig]); | |
2470 ::sem_post(&sig_sem); | |
2471 } | |
2472 | |
2473 static int check_pending_signals(bool wait) { | |
2474 Atomic::store(0, &sigint_count); | |
2475 for (;;) { | |
2476 for (int i = 0; i < NSIG + 1; i++) { | |
2477 jint n = pending_signals[i]; | |
2478 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2479 return i; | |
2480 } | |
2481 } | |
2482 if (!wait) { | |
2483 return -1; | |
2484 } | |
2485 JavaThread *thread = JavaThread::current(); | |
2486 ThreadBlockInVM tbivm(thread); | |
2487 | |
2488 bool threadIsSuspended; | |
2489 do { | |
2490 thread->set_suspend_equivalent(); | |
2491 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2492 ::sem_wait(&sig_sem); | |
2493 | |
2494 // were we externally suspended while we were waiting? | |
2495 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2496 if (threadIsSuspended) { | |
2497 // | |
2498 // The semaphore has been incremented, but while we were waiting | |
2499 // another thread suspended us. We don't want to continue running | |
2500 // while suspended because that would surprise the thread that | |
2501 // suspended us. | |
2502 // | |
2503 ::sem_post(&sig_sem); | |
2504 | |
2505 thread->java_suspend_self(); | |
2506 } | |
2507 } while (threadIsSuspended); | |
2508 } | |
2509 } | |
2510 | |
2511 int os::signal_lookup() { | |
2512 return check_pending_signals(false); | |
2513 } | |
2514 | |
2515 int os::signal_wait() { | |
2516 return check_pending_signals(true); | |
2517 } | |
2518 | |
2519 //////////////////////////////////////////////////////////////////////////////// | |
2520 // Virtual Memory | |
2521 | |
2522 int os::vm_page_size() { | |
2523 // Seems redundant as all get out | |
2524 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2525 return os::Linux::page_size(); | |
2526 } | |
2527 | |
2528 // Solaris allocates memory by pages. | |
2529 int os::vm_allocation_granularity() { | |
2530 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2531 return os::Linux::page_size(); | |
2532 } | |
2533 | |
2534 // Rationale behind this function: | |
2535 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2536 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2537 // samples for JITted code. Here we create private executable mapping over the code cache | |
2538 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2539 // info for the reporting script by storing timestamp and location of symbol | |
2540 void linux_wrap_code(char* base, size_t size) { | |
2541 static volatile jint cnt = 0; | |
2542 | |
2543 if (!UseOprofile) { | |
2544 return; | |
2545 } | |
2546 | |
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
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diff
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|
2547 char buf[PATH_MAX+1]; |
0 | 2548 int num = Atomic::add(1, &cnt); |
2549 | |
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
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1325
diff
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|
2550 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
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diff
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|
2551 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2552 unlink(buf); |
2553 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
2554 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2555 |
2556 if (fd != -1) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2557 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2558 if (rv != (off_t)-1) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
2559 if (::write(fd, "", 1) == 1) { |
0 | 2560 mmap(base, size, |
2561 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2562 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2563 } | |
2564 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2565 ::close(fd); |
0 | 2566 unlink(buf); |
2567 } | |
2568 } | |
2569 | |
10969
a837fa3d3f86
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|
2570 static bool recoverable_mmap_error(int err) { |
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diff
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|
2571 // See if the error is one we can let the caller handle. This |
a837fa3d3f86
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|
2572 // list of errno values comes from JBS-6843484. I can't find a |
a837fa3d3f86
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|
2573 // Linux man page that documents this specific set of errno |
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|
2574 // values so while this list currently matches Solaris, it may |
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|
2575 // change as we gain experience with this failure mode. |
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|
2576 switch (err) { |
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|
2577 case EBADF: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2578 case EINVAL: |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2579 case ENOTSUP: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2580 // let the caller deal with these errors |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2581 return true; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2582 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2583 default: |
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|
2584 // Any remaining errors on this OS can cause our reserved mapping |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2585 // to be lost. That can cause confusion where different data |
a837fa3d3f86
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diff
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|
2586 // structures think they have the same memory mapped. The worst |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2587 // scenario is if both the VM and a library think they have the |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2588 // same memory mapped. |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2589 return false; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2590 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2591 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2592 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2593 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2594 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2595 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2596 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2597 strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2598 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2599 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2600 static void warn_fail_commit_memory(char* addr, size_t size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2601 size_t alignment_hint, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2602 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2603 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
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|
2604 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2605 alignment_hint, exec, strerror(err), err); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2606 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2607 |
0 | 2608 // NOTE: Linux kernel does not really reserve the pages for us. |
2609 // All it does is to check if there are enough free pages | |
2610 // left at the time of mmap(). This could be a potential | |
2611 // problem. | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2612 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
656 | 2613 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2614 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2615 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2616 if (res != (uintptr_t) MAP_FAILED) { |
2617 if (UseNUMAInterleaving) { | |
2618 numa_make_global(addr, size); | |
2619 } | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2620 return 0; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2621 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2622 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2623 int err = errno; // save errno from mmap() call above |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2624 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2625 if (!recoverable_mmap_error(err)) { |
a837fa3d3f86
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diff
changeset
|
2626 warn_fail_commit_memory(addr, size, exec, err); |
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10405
diff
changeset
|
2627 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
a837fa3d3f86
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diff
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|
2628 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2629 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2630 return err; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2631 } |
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diff
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|
2632 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2633 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2634 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
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diff
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|
2635 } |
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diff
changeset
|
2636 |
a837fa3d3f86
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10405
diff
changeset
|
2637 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2638 const char* mesg) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2639 assert(mesg != NULL, "mesg must be specified"); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2640 int err = os::Linux::commit_memory_impl(addr, size, exec); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2641 if (err != 0) { |
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diff
changeset
|
2642 // the caller wants all commit errors to exit with the specified mesg: |
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changeset
|
2643 warn_fail_commit_memory(addr, size, exec, err); |
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|
2644 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2645 } |
0 | 2646 } |
2647 | |
3286
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|
2648 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
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|
2649 #ifndef MAP_HUGETLB |
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|
2650 #define MAP_HUGETLB 0x40000 |
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|
2651 #endif |
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|
2652 |
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|
2653 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
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|
2654 #ifndef MADV_HUGEPAGE |
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|
2655 #define MADV_HUGEPAGE 14 |
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|
2656 #endif |
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|
2657 |
10969
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|
2658 int os::Linux::commit_memory_impl(char* addr, size_t size, |
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|
2659 size_t alignment_hint, bool exec) { |
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|
2660 int err = os::Linux::commit_memory_impl(addr, size, exec); |
10969
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|
2661 if (err == 0) { |
3913
27702f012017
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|
2662 realign_memory(addr, size, alignment_hint); |
10969
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|
2663 } |
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|
2664 return err; |
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|
2665 } |
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|
2666 |
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|
2667 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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|
2668 bool exec) { |
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|
2669 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
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|
2670 } |
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|
2671 |
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|
2672 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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|
2673 size_t alignment_hint, bool exec, |
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|
2674 const char* mesg) { |
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|
2675 assert(mesg != NULL, "mesg must be specified"); |
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|
2676 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
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|
2677 if (err != 0) { |
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|
2678 // the caller wants all commit errors to exit with the specified mesg: |
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|
2679 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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|
2680 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2681 } |
0 | 2682 } |
2683 | |
6197 | 2684 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
12110
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|
2685 if (UseTransparentHugePages && alignment_hint > (size_t)vm_page_size()) { |
3286
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|
2686 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
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|
2687 // be supported or the memory may already be backed by huge pages. |
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|
2688 ::madvise(addr, bytes, MADV_HUGEPAGE); |
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|
2689 } |
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|
2690 } |
141 | 2691 |
6197 | 2692 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
5937
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|
2693 // This method works by doing an mmap over an existing mmaping and effectively discarding |
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|
2694 // the existing pages. However it won't work for SHM-based large pages that cannot be |
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|
2695 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
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|
2696 // small pages on top of the SHM segment. This method always works for small pages, so we |
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|
2697 // allow that in any case. |
12110
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|
2698 if (alignment_hint <= (size_t)os::vm_page_size() || can_commit_large_page_memory()) { |
10969
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|
2699 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
5937
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|
2700 } |
141 | 2701 } |
2702 | |
462
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|
2703 void os::numa_make_global(char *addr, size_t bytes) { |
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|
2704 Linux::numa_interleave_memory(addr, bytes); |
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|
2705 } |
141 | 2706 |
12176
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|
2707 // Define for numa_set_bind_policy(int). Setting the argument to 0 will set the |
88c255656030
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|
2708 // bind policy to MPOL_PREFERRED for the current thread. |
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|
2709 #define USE_MPOL_PREFERRED 0 |
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|
2710 |
141 | 2711 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
12176
88c255656030
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|
2712 // To make NUMA and large pages more robust when both enabled, we need to ease |
88c255656030
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|
2713 // the requirements on where the memory should be allocated. MPOL_BIND is the |
88c255656030
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|
2714 // default policy and it will force memory to be allocated on the specified |
88c255656030
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|
2715 // node. Changing this to MPOL_PREFERRED will prefer to allocate the memory on |
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|
2716 // the specified node, but will not force it. Using this policy will prevent |
88c255656030
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|
2717 // getting SIGBUS when trying to allocate large pages on NUMA nodes with no |
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|
2718 // free large pages. |
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|
2719 Linux::numa_set_bind_policy(USE_MPOL_PREFERRED); |
141 | 2720 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); |
2721 } | |
2722 | |
2723 bool os::numa_topology_changed() { return false; } | |
2724 | |
2725 size_t os::numa_get_groups_num() { | |
2726 int max_node = Linux::numa_max_node(); | |
2727 return max_node > 0 ? max_node + 1 : 1; | |
2728 } | |
2729 | |
2730 int os::numa_get_group_id() { | |
2731 int cpu_id = Linux::sched_getcpu(); | |
2732 if (cpu_id != -1) { | |
2733 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2734 if (lgrp_id != -1) { | |
2735 return lgrp_id; | |
2736 } | |
0 | 2737 } |
2738 return 0; | |
2739 } | |
2740 | |
141 | 2741 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2742 for (size_t i = 0; i < size; i++) { | |
2743 ids[i] = i; | |
2744 } | |
2745 return size; | |
2746 } | |
2747 | |
0 | 2748 bool os::get_page_info(char *start, page_info* info) { |
2749 return false; | |
2750 } | |
2751 | |
2752 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2753 return end; | |
2754 } | |
2755 | |
3826 | 2756 |
2757 int os::Linux::sched_getcpu_syscall(void) { | |
23822
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|
2758 unsigned int cpu = 0; |
3826 | 2759 int retval = -1; |
2760 | |
2761 #if defined(IA32) | |
3887
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|
2762 # ifndef SYS_getcpu |
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|
2763 # define SYS_getcpu 318 |
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|
2764 # endif |
3826 | 2765 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2766 #elif defined(AMD64) | |
3887
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|
2767 // Unfortunately we have to bring all these macros here from vsyscall.h |
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|
2768 // to be able to compile on old linuxes. |
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|
2769 # define __NR_vgetcpu 2 |
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|
2770 # define VSYSCALL_START (-10UL << 20) |
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|
2771 # define VSYSCALL_SIZE 1024 |
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|
2772 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2773 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2774 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2775 retval = vgetcpu(&cpu, NULL, NULL); | |
2776 #endif | |
2777 | |
2778 return (retval == -1) ? retval : cpu; | |
2779 } | |
2780 | |
2191 | 2781 // Something to do with the numa-aware allocator needs these symbols |
2782 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2783 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2784 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2785 |
763
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|
2786 |
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|
2787 // If we are running with libnuma version > 2, then we should |
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|
2788 // be trying to use symbols with versions 1.1 |
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|
2789 // If we are running with earlier version, which did not have symbol versions, |
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|
2790 // we should use the base version. |
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|
2791 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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|
2792 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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|
2793 if (f == NULL) { |
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|
2794 f = dlsym(handle, name); |
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|
2795 } |
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|
2796 return f; |
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|
2797 } |
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|
2798 |
462
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|
2799 bool os::Linux::libnuma_init() { |
141 | 2800 // sched_getcpu() should be in libc. |
2801 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2802 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2803 | |
3826 | 2804 // If it's not, try a direct syscall. |
2805 if (sched_getcpu() == -1) | |
2806 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2807 | |
141 | 2808 if (sched_getcpu() != -1) { // Does it work? |
267
9d6a3a6891f8
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diff
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|
2809 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2810 if (handle != NULL) { |
2811 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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|
2812 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2813 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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|
2814 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2815 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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|
2816 libnuma_dlsym(handle, "numa_available"))); |
141 | 2817 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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2818 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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2819 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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2820 libnuma_dlsym(handle, "numa_interleave_memory"))); |
12176
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|
2821 set_numa_set_bind_policy(CAST_TO_FN_PTR(numa_set_bind_policy_func_t, |
88c255656030
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|
2822 libnuma_dlsym(handle, "numa_set_bind_policy"))); |
462
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2823 |
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2824 |
141 | 2825 if (numa_available() != -1) { |
763
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|
2826 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2827 // Create a cpu -> node mapping |
6197 | 2828 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2829 rebuild_cpu_to_node_map(); |
462
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|
2830 return true; |
141 | 2831 } |
2832 } | |
2833 } | |
462
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|
2834 return false; |
141 | 2835 } |
2836 | |
2837 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2838 // The table is later used in get_node_by_cpu(). | |
2839 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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|
2840 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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|
2841 // in libnuma (possible values are starting from 16, |
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|
2842 // and continuing up with every other power of 2, but less |
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|
2843 // than the maximum number of CPUs supported by kernel), and |
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|
2844 // is a subject to change (in libnuma version 2 the requirements |
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|
2845 // are more reasonable) we'll just hardcode the number they use |
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|
2846 // in the library. |
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|
2847 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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2848 |
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|
2849 size_t cpu_num = os::active_processor_count(); |
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|
2850 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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|
2851 size_t cpu_map_valid_size = |
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|
2852 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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|
2853 |
141 | 2854 cpu_to_node()->clear(); |
2855 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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|
2856 size_t node_num = numa_get_groups_num(); |
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|
2857 |
6197 | 2858 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
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|
2859 for (size_t i = 0; i < node_num; i++) { |
141 | 2860 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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|
2861 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2862 if (cpu_map[j] != 0) { |
462
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|
2863 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2864 if (cpu_map[j] & (1UL << k)) { |
462
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|
2865 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2866 } |
2867 } | |
2868 } | |
2869 } | |
2870 } | |
2871 } | |
6197 | 2872 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2873 } |
2874 | |
2875 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2876 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2877 return cpu_to_node()->at(cpu_id); | |
2878 } | |
2879 return -1; | |
2880 } | |
2881 | |
2882 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2883 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2884 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2885 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2886 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2887 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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|
2888 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
12176
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8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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|
2889 os::Linux::numa_set_bind_policy_func_t os::Linux::_numa_set_bind_policy; |
462
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|
2890 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2891 |
6197 | 2892 bool os::pd_uncommit_memory(char* addr, size_t size) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
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|
2893 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2894 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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|
2895 return res != (uintptr_t) MAP_FAILED; |
0 | 2896 } |
2897 | |
12144
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|
2898 static |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2899 address get_stack_commited_bottom(address bottom, size_t size) { |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2900 address nbot = bottom; |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2901 address ntop = bottom + size; |
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|
2902 |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2903 size_t page_sz = os::vm_page_size(); |
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|
2904 unsigned pages = size / page_sz; |
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|
2905 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2906 unsigned char vec[1]; |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2907 unsigned imin = 1, imax = pages + 1, imid; |
17765 | 2908 int mincore_return_value = 0; |
2909 | |
2910 assert(imin <= imax, "Unexpected page size"); | |
12144
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2911 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2912 while (imin < imax) { |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2913 imid = (imax + imin) / 2; |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2914 nbot = ntop - (imid * page_sz); |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2915 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2916 // Use a trick with mincore to check whether the page is mapped or not. |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2917 // mincore sets vec to 1 if page resides in memory and to 0 if page |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2918 // is swapped output but if page we are asking for is unmapped |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2919 // it returns -1,ENOMEM |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2920 mincore_return_value = mincore(nbot, page_sz, vec); |
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|
2921 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2922 if (mincore_return_value == -1) { |
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|
2923 // Page is not mapped go up |
d8e99408faad
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|
2924 // to find first mapped page |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2925 if (errno != EAGAIN) { |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2926 assert(errno == ENOMEM, "Unexpected mincore errno"); |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2927 imax = imid; |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2928 } |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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diff
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|
2929 } else { |
d8e99408faad
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|
2930 // Page is mapped go down |
d8e99408faad
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|
2931 // to find first not mapped page |
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|
2932 imin = imid + 1; |
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|
2933 } |
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|
2934 } |
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|
2935 |
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|
2936 nbot = nbot + page_sz; |
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|
2937 |
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|
2938 // Adjust stack bottom one page up if last checked page is not mapped |
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|
2939 if (mincore_return_value == -1) { |
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|
2940 nbot = nbot + page_sz; |
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|
2941 } |
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|
2942 |
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|
2943 return nbot; |
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|
2944 } |
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|
2945 |
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|
2946 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
2947 // Linux uses a growable mapping for the stack, and if the mapping for |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2948 // the stack guard pages is not removed when we detach a thread the |
3b3d12e645e7
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diff
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|
2949 // stack cannot grow beyond the pages where the stack guard was |
3b3d12e645e7
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diff
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|
2950 // mapped. If at some point later in the process the stack expands to |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
changeset
|
2951 // that point, the Linux kernel cannot expand the stack any further |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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diff
changeset
|
2952 // because the guard pages are in the way, and a segfault occurs. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2953 // |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2954 // However, it's essential not to split the stack region by unmapping |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2955 // a region (leaving a hole) that's already part of the stack mapping, |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
2956 // so if the stack mapping has already grown beyond the guard pages at |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2957 // the time we create them, we have to truncate the stack mapping. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
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|
2958 // So, we need to know the extent of the stack mapping when |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
diff
changeset
|
2959 // create_stack_guard_pages() is called. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
2960 |
3b3d12e645e7
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diff
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|
2961 // We only need this for stacks that are growable: at the time of |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2962 // writing thread stacks don't use growable mappings (i.e. those |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2963 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2964 // only applies to the main thread. |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
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2302
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2965 |
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2966 // If the (growable) stack mapping already extends beyond the point |
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2967 // where we're going to put our guard pages, truncate the mapping at |
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2968 // that point by munmap()ping it. This ensures that when we later |
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2969 // munmap() the guard pages we don't leave a hole in the stack |
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2970 // mapping. This only affects the main/initial thread |
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2971 |
6197 | 2972 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
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2973 |
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2974 if (os::Linux::is_initial_thread()) { |
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2975 // As we manually grow stack up to bottom inside create_attached_thread(), |
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2976 // it's likely that os::Linux::initial_thread_stack_bottom is mapped and |
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2977 // we don't need to do anything special. |
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2978 // Check it first, before calling heavy function. |
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2979 uintptr_t stack_extent = (uintptr_t) os::Linux::initial_thread_stack_bottom(); |
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2980 unsigned char vec[1]; |
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2981 |
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2982 if (mincore((address)stack_extent, os::vm_page_size(), vec) == -1) { |
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2983 // Fallback to slow path on all errors, including EAGAIN |
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2984 stack_extent = (uintptr_t) get_stack_commited_bottom( |
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2985 os::Linux::initial_thread_stack_bottom(), |
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2986 (size_t)addr - stack_extent); |
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2987 } |
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2988 |
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2989 if (stack_extent < (uintptr_t)addr) { |
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2990 ::munmap((void*)stack_extent, (uintptr_t)(addr - stack_extent)); |
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2991 } |
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2992 } |
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2993 |
10969
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2994 return os::commit_memory(addr, size, !ExecMem); |
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2995 } |
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2996 |
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2997 // If this is a growable mapping, remove the guard pages entirely by |
1750
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2998 // munmap()ping them. If not, just call uncommit_memory(). This only |
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2999 // affects the main/initial thread, but guard against future OS changes |
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3000 // It's safe to always unmap guard pages for initial thread because we |
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3001 // always place it right after end of the mapped region |
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3002 |
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3003 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
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3004 uintptr_t stack_extent, stack_base; |
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3005 |
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3006 if (os::Linux::is_initial_thread()) { |
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3007 return ::munmap(addr, size) == 0; |
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3008 } |
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3009 |
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3010 return os::uncommit_memory(addr, size); |
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3011 } |
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3012 |
0 | 3013 static address _highest_vm_reserved_address = NULL; |
3014 | |
3015 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
3016 // at 'requested_addr'. If there are existing memory mappings at the same | |
3017 // location, however, they will be overwritten. If 'fixed' is false, | |
3018 // 'requested_addr' is only treated as a hint, the return value may or | |
3019 // may not start from the requested address. Unlike Linux mmap(), this | |
3020 // function returns NULL to indicate failure. | |
3021 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
3022 char * addr; | |
3023 int flags; | |
3024 | |
3025 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
3026 if (fixed) { | |
3027 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
3028 flags |= MAP_FIXED; | |
3029 } | |
3030 | |
10157 | 3031 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
3032 // touch an uncommitted page. Otherwise, the read/write might | |
3033 // succeed if we have enough swap space to back the physical page. | |
3034 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
0 | 3035 flags, -1, 0); |
3036 | |
3037 if (addr != MAP_FAILED) { | |
3038 // anon_mmap() should only get called during VM initialization, | |
3039 // don't need lock (actually we can skip locking even it can be called | |
3040 // from multiple threads, because _highest_vm_reserved_address is just a | |
3041 // hint about the upper limit of non-stack memory regions.) | |
3042 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
3043 _highest_vm_reserved_address = (address)addr + bytes; | |
3044 } | |
3045 } | |
3046 | |
3047 return addr == MAP_FAILED ? NULL : addr; | |
3048 } | |
3049 | |
24007
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3050 // Allocate (using mmap, NO_RESERVE, with small pages) at either a given request address |
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|
3051 // (req_addr != NULL) or with a given alignment. |
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3052 // - bytes shall be a multiple of alignment. |
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3053 // - req_addr can be NULL. If not NULL, it must be a multiple of alignment. |
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3054 // - alignment sets the alignment at which memory shall be allocated. |
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3055 // It must be a multiple of allocation granularity. |
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3056 // Returns address of memory or NULL. If req_addr was not NULL, will only return |
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3057 // req_addr or NULL. |
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3058 static char* anon_mmap_aligned(size_t bytes, size_t alignment, char* req_addr) { |
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3059 |
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|
3060 size_t extra_size = bytes; |
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3061 if (req_addr == NULL && alignment > 0) { |
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3062 extra_size += alignment; |
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3063 } |
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3064 |
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3065 char* start = (char*) ::mmap(req_addr, extra_size, PROT_NONE, |
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3066 MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, |
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3067 -1, 0); |
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3068 if (start == MAP_FAILED) { |
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3069 start = NULL; |
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3070 } else { |
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3071 if (req_addr != NULL) { |
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3072 if (start != req_addr) { |
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3073 ::munmap(start, extra_size); |
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3074 start = NULL; |
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3075 } |
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3076 } else { |
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3077 char* const start_aligned = (char*) align_ptr_up(start, alignment); |
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3078 char* const end_aligned = start_aligned + bytes; |
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3079 char* const end = start + extra_size; |
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3080 if (start_aligned > start) { |
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3081 ::munmap(start, start_aligned - start); |
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3082 } |
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3083 if (end_aligned < end) { |
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3084 ::munmap(end_aligned, end - end_aligned); |
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3085 } |
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3086 start = start_aligned; |
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3087 } |
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3088 } |
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3089 return start; |
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3090 } |
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3091 |
0 | 3092 // Don't update _highest_vm_reserved_address, because there might be memory |
3093 // regions above addr + size. If so, releasing a memory region only creates | |
3094 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
3095 // | |
3096 static int anon_munmap(char * addr, size_t size) { | |
3097 return ::munmap(addr, size) == 0; | |
3098 } | |
3099 | |
6197 | 3100 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 3101 size_t alignment_hint) { |
3102 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
3103 } | |
3104 | |
6197 | 3105 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 3106 return anon_munmap(addr, size); |
3107 } | |
3108 | |
3109 static address highest_vm_reserved_address() { | |
3110 return _highest_vm_reserved_address; | |
3111 } | |
3112 | |
3113 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
3114 // Linux wants the mprotect address argument to be page aligned. | |
3115 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
3116 | |
3117 // According to SUSv3, mprotect() should only be used with mappings | |
3118 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
3119 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
3120 // protection of malloc'ed or statically allocated memory). Check the | |
3121 // caller if you hit this assert. | |
3122 assert(addr == bottom, "sanity check"); | |
3123 | |
3124 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
3125 return ::mprotect(bottom, size, prot) == 0; | |
3126 } | |
3127 | |
237
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3128 // Set protections specified |
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3129 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
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3130 bool is_committed) { |
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235
diff
changeset
|
3131 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3132 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3133 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3134 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3135 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3136 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3137 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3138 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3139 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3140 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3141 return linux_mprotect(addr, bytes, p); |
0 | 3142 } |
3143 | |
3144 bool os::guard_memory(char* addr, size_t size) { | |
3145 return linux_mprotect(addr, size, PROT_NONE); | |
3146 } | |
3147 | |
3148 bool os::unguard_memory(char* addr, size_t size) { | |
477
24fda36852ce
6727377: VM stack guard pages on Windows should PAGE_READWRITE not PAGE_EXECUTE_READWRITE
coleenp
parents:
462
diff
changeset
|
3149 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 3150 } |
3151 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3152 bool os::Linux::transparent_huge_pages_sanity_check(bool warn, size_t page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3153 bool result = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3154 void *p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3155 MAP_ANONYMOUS|MAP_PRIVATE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3156 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3157 if (p != MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3158 void *aligned_p = align_ptr_up(p, page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3159 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3160 result = madvise(aligned_p, page_size, MADV_HUGEPAGE) == 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3161 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3162 munmap(p, page_size * 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3163 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3164 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3165 if (warn && !result) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3166 warning("TransparentHugePages is not supported by the operating system."); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3167 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3168 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3169 return result; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3170 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3171 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3172 bool os::Linux::hugetlbfs_sanity_check(bool warn, size_t page_size) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3173 bool result = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3174 void *p = mmap(NULL, page_size, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3175 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3176 -1, 0); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3177 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3178 if (p != MAP_FAILED) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3179 // We don't know if this really is a huge page or not. |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3180 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3181 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3182 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3183 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3184 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3185 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3186 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3187 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3188 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3189 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3190 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3191 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3192 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3193 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3194 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3195 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3196 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3197 munmap(p, page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3198 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3199 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3200 if (warn && !result) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3201 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3202 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3203 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3204 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3205 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3206 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3207 /* |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3208 * Set the coredump_filter bits to include largepages in core dump (bit 6) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3209 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3210 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3211 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3212 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3213 * - (bit 1) anonymous shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3214 * - (bit 2) file-backed private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3215 * - (bit 3) file-backed shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3216 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3217 * effective only if the bit 2 is cleared) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3218 * - (bit 5) hugetlb private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3219 * - (bit 6) hugetlb shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3220 */ |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3221 static void set_coredump_filter(void) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3222 FILE *f; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3223 long cdm; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3224 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3225 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3226 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3227 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3228 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3229 if (fscanf(f, "%lx", &cdm) != 1) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3230 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3231 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3232 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3233 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3234 rewind(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3235 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3236 if ((cdm & LARGEPAGES_BIT) == 0) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3237 cdm |= LARGEPAGES_BIT; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3238 fprintf(f, "%#lx", cdm); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3239 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3240 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3241 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3242 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3243 |
0 | 3244 // Large page support |
3245 | |
3246 static size_t _large_page_size = 0; | |
3247 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3248 size_t os::Linux::find_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3249 size_t large_page_size = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3250 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3251 // large_page_size on Linux is used to round up heap size. x86 uses either |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3252 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3253 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3254 // page as large as 256M. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3255 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3256 // Here we try to figure out page size by parsing /proc/meminfo and looking |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3257 // for a line with the following format: |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3258 // Hugepagesize: 2048 kB |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3259 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3260 // If we can't determine the value (e.g. /proc is not mounted, or the text |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3261 // format has been changed), we'll use the largest page size supported by |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3262 // the processor. |
0 | 3263 |
1010 | 3264 #ifndef ZERO |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3265 large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3266 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3267 #endif // ZERO |
0 | 3268 |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3269 FILE *fp = fopen("/proc/meminfo", "r"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3270 if (fp) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3271 while (!feof(fp)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3272 int x = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3273 char buf[16]; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3274 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3275 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3276 large_page_size = x * K; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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11092
diff
changeset
|
3277 break; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3278 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3279 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3280 // skip to next line |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3281 for (;;) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3282 int ch = fgetc(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3283 if (ch == EOF || ch == (int)'\n') break; |
0 | 3284 } |
3285 } | |
3286 } | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3287 fclose(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3288 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3289 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3290 if (!FLAG_IS_DEFAULT(LargePageSizeInBytes) && LargePageSizeInBytes != large_page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3291 warning("Setting LargePageSizeInBytes has no effect on this OS. Large page size is " |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3292 SIZE_FORMAT "%s.", byte_size_in_proper_unit(large_page_size), |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3293 proper_unit_for_byte_size(large_page_size)); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3294 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3295 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3296 return large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3297 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3298 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3299 size_t os::Linux::setup_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3300 _large_page_size = Linux::find_large_page_size(); |
0 | 3301 const size_t default_page_size = (size_t)Linux::page_size(); |
3302 if (_large_page_size > default_page_size) { | |
3303 _page_sizes[0] = _large_page_size; | |
3304 _page_sizes[1] = default_page_size; | |
3305 _page_sizes[2] = 0; | |
3306 } | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3307 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3308 return _large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3309 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3310 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3311 bool os::Linux::setup_large_page_type(size_t page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3312 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3313 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3314 FLAG_IS_DEFAULT(UseTransparentHugePages)) { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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12252
diff
changeset
|
3315 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3316 // The type of large pages has not been specified by the user. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3317 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3318 // Try UseHugeTLBFS and then UseSHM. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3319 UseHugeTLBFS = UseSHM = true; |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3320 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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parents:
12252
diff
changeset
|
3321 // Don't try UseTransparentHugePages since there are known |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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12252
diff
changeset
|
3322 // performance issues with it turned on. This might change in the future. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
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diff
changeset
|
3323 UseTransparentHugePages = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3324 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3325 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3326 if (UseTransparentHugePages) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3327 bool warn_on_failure = !FLAG_IS_DEFAULT(UseTransparentHugePages); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3328 if (transparent_huge_pages_sanity_check(warn_on_failure, page_size)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3329 UseHugeTLBFS = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3330 UseSHM = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3331 return true; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3332 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3333 UseTransparentHugePages = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3334 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3335 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3336 if (UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3337 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3338 if (hugetlbfs_sanity_check(warn_on_failure, page_size)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3339 UseSHM = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3340 return true; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3341 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3342 UseHugeTLBFS = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3343 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3344 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3345 return UseSHM; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3346 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3347 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3348 void os::large_page_init() { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3349 if (!UseLargePages && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3350 !UseTransparentHugePages && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3351 !UseHugeTLBFS && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3352 !UseSHM) { |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3353 // Not using large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3354 return; |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3355 } |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3356 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3357 if (!FLAG_IS_DEFAULT(UseLargePages) && !UseLargePages) { |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3358 // The user explicitly turned off large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3359 // Ignore the rest of the large pages flags. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3360 UseTransparentHugePages = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3361 UseHugeTLBFS = false; |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3362 UseSHM = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3363 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3364 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3365 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3366 size_t large_page_size = Linux::setup_large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3367 UseLargePages = Linux::setup_large_page_type(large_page_size); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3368 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3369 set_coredump_filter(); |
0 | 3370 } |
3371 | |
3372 #ifndef SHM_HUGETLB | |
3373 #define SHM_HUGETLB 04000 | |
3374 #endif | |
3375 | |
24007
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3376 #define shm_warning_format(format, ...) \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3377 do { \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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24006
diff
changeset
|
3378 if (UseLargePages && \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3379 (!FLAG_IS_DEFAULT(UseLargePages) || \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3380 !FLAG_IS_DEFAULT(UseSHM) || \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3381 !FLAG_IS_DEFAULT(LargePageSizeInBytes))) { \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3382 warning(format, __VA_ARGS__); \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3383 } \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3384 } while (0) |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3385 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
parents:
24006
diff
changeset
|
3386 #define shm_warning(str) shm_warning_format("%s", str) |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3387 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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24006
diff
changeset
|
3388 #define shm_warning_with_errno(str) \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3389 do { \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3390 int err = errno; \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
parents:
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diff
changeset
|
3391 shm_warning_format(str " (error = %d)", err); \ |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3392 } while (0) |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3393 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3394 static char* shmat_with_alignment(int shmid, size_t bytes, size_t alignment) { |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3395 assert(is_size_aligned(bytes, alignment), "Must be divisible by the alignment"); |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3396 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3397 if (!is_size_aligned(alignment, SHMLBA)) { |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
parents:
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diff
changeset
|
3398 assert(false, "Code below assumes that alignment is at least SHMLBA aligned"); |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3399 return NULL; |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3400 } |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3401 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3402 // To ensure that we get 'alignment' aligned memory from shmat, |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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diff
changeset
|
3403 // we pre-reserve aligned virtual memory and then attach to that. |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3404 |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
stefank
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24006
diff
changeset
|
3405 char* pre_reserved_addr = anon_mmap_aligned(bytes, alignment, NULL); |
776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
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diff
changeset
|
3406 if (pre_reserved_addr == NULL) { |
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3407 // Couldn't pre-reserve aligned memory. |
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3408 shm_warning("Failed to pre-reserve aligned memory for shmat."); |
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3409 return NULL; |
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3410 } |
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3411 |
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3412 // SHM_REMAP is needed to allow shmat to map over an existing mapping. |
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3413 char* addr = (char*)shmat(shmid, pre_reserved_addr, SHM_REMAP); |
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3414 |
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3415 if ((intptr_t)addr == -1) { |
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3416 int err = errno; |
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3417 shm_warning_with_errno("Failed to attach shared memory."); |
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3418 |
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3419 assert(err != EACCES, "Unexpected error"); |
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3420 assert(err != EIDRM, "Unexpected error"); |
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3421 assert(err != EINVAL, "Unexpected error"); |
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3422 |
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3423 // Since we don't know if the kernel unmapped the pre-reserved memory area |
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3424 // we can't unmap it, since that would potentially unmap memory that was |
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3425 // mapped from other threads. |
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3426 return NULL; |
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3427 } |
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3428 |
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3429 return addr; |
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3430 } |
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3431 |
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3432 static char* shmat_at_address(int shmid, char* req_addr) { |
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3433 if (!is_ptr_aligned(req_addr, SHMLBA)) { |
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3434 assert(false, "Requested address needs to be SHMLBA aligned"); |
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3435 return NULL; |
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3436 } |
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3437 |
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3438 char* addr = (char*)shmat(shmid, req_addr, 0); |
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3439 |
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3440 if ((intptr_t)addr == -1) { |
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3441 shm_warning_with_errno("Failed to attach shared memory."); |
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3442 return NULL; |
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3443 } |
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3444 |
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3445 return addr; |
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3446 } |
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3447 |
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3448 static char* shmat_large_pages(int shmid, size_t bytes, size_t alignment, char* req_addr) { |
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3449 // If a req_addr has been provided, we assume that the caller has already aligned the address. |
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3450 if (req_addr != NULL) { |
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3451 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Must be divisible by the large page size"); |
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3452 assert(is_ptr_aligned(req_addr, alignment), "Must be divisible by given alignment"); |
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3453 return shmat_at_address(shmid, req_addr); |
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3454 } |
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3455 |
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3456 // Since shmid has been setup with SHM_HUGETLB, shmat will automatically |
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3457 // return large page size aligned memory addresses when req_addr == NULL. |
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3458 // However, if the alignment is larger than the large page size, we have |
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3459 // to manually ensure that the memory returned is 'alignment' aligned. |
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3460 if (alignment > os::large_page_size()) { |
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3461 assert(is_size_aligned(alignment, os::large_page_size()), "Must be divisible by the large page size"); |
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3462 return shmat_with_alignment(shmid, bytes, alignment); |
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3463 } else { |
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3464 return shmat_at_address(shmid, NULL); |
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3465 } |
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3466 } |
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3467 |
12110
4c84d351cca9
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|
3468 char* os::Linux::reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
656 | 3469 // "exec" is passed in but not used. Creating the shared image for |
3470 // the code cache doesn't have an SHM_X executable permission to check. | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
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|
3471 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
12110
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3472 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
24007
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|
3473 assert(is_ptr_aligned(req_addr, alignment), "Unaligned address"); |
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3474 |
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3475 if (!is_size_aligned(bytes, os::large_page_size())) { |
12110
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3476 return NULL; // Fallback to small pages. |
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3477 } |
0 | 3478 |
3479 // Create a large shared memory region to attach to based on size. | |
24007
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3480 // Currently, size is the total size of the heap. |
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|
3481 int shmid = shmget(IPC_PRIVATE, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); |
0 | 3482 if (shmid == -1) { |
24007
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3483 // Possible reasons for shmget failure: |
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3484 // 1. shmmax is too small for Java heap. |
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3485 // > check shmmax value: cat /proc/sys/kernel/shmmax |
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3486 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax |
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3487 // 2. not enough large page memory. |
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3488 // > check available large pages: cat /proc/meminfo |
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3489 // > increase amount of large pages: |
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3490 // echo new_value > /proc/sys/vm/nr_hugepages |
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3491 // Note 1: different Linux may use different name for this property, |
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3492 // e.g. on Redhat AS-3 it is "hugetlb_pool". |
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3493 // Note 2: it's possible there's enough physical memory available but |
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3494 // they are so fragmented after a long run that they can't |
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3495 // coalesce into large pages. Try to reserve large pages when |
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3496 // the system is still "fresh". |
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|
3497 shm_warning_with_errno("Failed to reserve shared memory."); |
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3498 return NULL; |
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3499 } |
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3500 |
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3501 // Attach to the region. |
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3502 char* addr = shmat_large_pages(shmid, bytes, alignment, req_addr); |
0 | 3503 |
3504 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3505 // will be deleted when it's detached by shmdt() or when the process | |
3506 // terminates. If shmat() is not successful this will remove the shared | |
3507 // segment immediately. | |
3508 shmctl(shmid, IPC_RMID, NULL); | |
3509 | |
12110
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|
3510 return addr; |
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|
3511 } |
4c84d351cca9
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|
3512 |
4c84d351cca9
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|
3513 static void warn_on_large_pages_failure(char* req_addr, size_t bytes, int error) { |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
3514 assert(error == ENOMEM, "Only expect to fail if no memory is available"); |
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changeset
|
3515 |
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diff
changeset
|
3516 bool warn_on_failure = UseLargePages && |
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|
3517 (!FLAG_IS_DEFAULT(UseLargePages) || |
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|
3518 !FLAG_IS_DEFAULT(UseHugeTLBFS) || |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3519 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); |
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changeset
|
3520 |
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diff
changeset
|
3521 if (warn_on_failure) { |
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changeset
|
3522 char msg[128]; |
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changeset
|
3523 jio_snprintf(msg, sizeof(msg), "Failed to reserve large pages memory req_addr: " |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3524 PTR_FORMAT " bytes: " SIZE_FORMAT " (errno = %d).", req_addr, bytes, error); |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3525 warning("%s", msg); |
12110
4c84d351cca9
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diff
changeset
|
3526 } |
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diff
changeset
|
3527 } |
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diff
changeset
|
3528 |
4c84d351cca9
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diff
changeset
|
3529 char* os::Linux::reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3530 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3531 assert(is_size_aligned(bytes, os::large_page_size()), "Unaligned size"); |
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changeset
|
3532 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
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changeset
|
3533 |
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changeset
|
3534 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
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changeset
|
3535 char* addr = (char*)::mmap(req_addr, bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3536 MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, |
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changeset
|
3537 -1, 0); |
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diff
changeset
|
3538 |
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changeset
|
3539 if (addr == MAP_FAILED) { |
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changeset
|
3540 warn_on_large_pages_failure(req_addr, bytes, errno); |
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diff
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|
3541 return NULL; |
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diff
changeset
|
3542 } |
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diff
changeset
|
3543 |
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diff
changeset
|
3544 assert(is_ptr_aligned(addr, os::large_page_size()), "Must be"); |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
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parents:
8710
diff
changeset
|
3545 |
0 | 3546 return addr; |
3547 } | |
3548 | |
24006
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8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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changeset
|
3549 // Reserve memory using mmap(MAP_HUGETLB). |
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|
3550 // - bytes shall be a multiple of alignment. |
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|
3551 // - req_addr can be NULL. If not NULL, it must be a multiple of alignment. |
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|
3552 // - alignment sets the alignment at which memory shall be allocated. |
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diff
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|
3553 // It must be a multiple of allocation granularity. |
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diff
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|
3554 // Returns address of memory or NULL. If req_addr was not NULL, will only return |
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8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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diff
changeset
|
3555 // req_addr or NULL. |
12110
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diff
changeset
|
3556 char* os::Linux::reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
3557 size_t large_page_size = os::large_page_size(); |
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diff
changeset
|
3558 assert(bytes >= large_page_size, "Shouldn't allocate large pages for small sizes"); |
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changeset
|
3559 |
24006
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8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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diff
changeset
|
3560 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
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8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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diff
changeset
|
3561 assert(is_size_aligned(bytes, alignment), "Must be"); |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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diff
changeset
|
3562 |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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parents:
23822
diff
changeset
|
3563 // First reserve - but not commit - the address range in small pages. |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
3564 char* const start = anon_mmap_aligned(bytes, alignment, req_addr); |
12110
4c84d351cca9
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stefank
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diff
changeset
|
3565 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3566 if (start == NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3567 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3568 } |
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diff
changeset
|
3569 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3570 assert(is_ptr_aligned(start, alignment), "Must be"); |
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parents:
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diff
changeset
|
3571 |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3572 char* end = start + bytes; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3573 |
4c84d351cca9
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diff
changeset
|
3574 // Find the regions of the allocated chunk that can be promoted to large pages. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3575 char* lp_start = (char*)align_ptr_up(start, large_page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3576 char* lp_end = (char*)align_ptr_down(end, large_page_size); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3577 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3578 size_t lp_bytes = lp_end - lp_start; |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3579 |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3580 assert(is_size_aligned(lp_bytes, large_page_size), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3581 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3582 if (lp_bytes == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3583 // The mapped region doesn't even span the start and the end of a large page. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3584 // Fall back to allocate a non-special area. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3585 ::munmap(start, end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3586 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3587 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3588 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3589 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3590 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3591 void* result; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3592 |
24006
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
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diff
changeset
|
3593 // Commit small-paged leading area. |
12110
4c84d351cca9
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diff
changeset
|
3594 if (start != lp_start) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3595 result = ::mmap(start, lp_start - start, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3596 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3597 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3598 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3599 ::munmap(lp_start, end - lp_start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3600 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3601 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3602 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3603 |
24006
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
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diff
changeset
|
3604 // Commit large-paged area. |
12110
4c84d351cca9
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stefank
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diff
changeset
|
3605 result = ::mmap(lp_start, lp_bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3606 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED|MAP_HUGETLB, |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3607 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3608 if (result == MAP_FAILED) { |
24006
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
3609 warn_on_large_pages_failure(lp_start, lp_bytes, errno); |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3610 // If the mmap above fails, the large pages region will be unmapped and we |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3611 // have regions before and after with small pages. Release these regions. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3612 // |
4c84d351cca9
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parents:
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diff
changeset
|
3613 // | mapped | unmapped | mapped | |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3614 // ^ ^ ^ ^ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3615 // start lp_start lp_end end |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3616 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3617 ::munmap(start, lp_start - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3618 ::munmap(lp_end, end - lp_end); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3619 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3620 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3621 |
24006
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
3622 // Commit small-paged trailing area. |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3623 if (lp_end != end) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3624 result = ::mmap(lp_end, end - lp_end, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3625 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3626 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3627 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3628 ::munmap(start, lp_end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3629 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3630 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3631 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3632 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3633 return start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3634 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3635 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3636 char* os::Linux::reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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3637 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
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3638 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
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|
3639 assert(is_size_aligned(alignment, os::vm_allocation_granularity()), "Must be"); |
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3640 assert(is_power_of_2(os::large_page_size()), "Must be"); |
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3641 assert(bytes >= os::large_page_size(), "Shouldn't allocate large pages for small sizes"); |
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3642 |
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3643 if (is_size_aligned(bytes, os::large_page_size()) && alignment <= os::large_page_size()) { |
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3644 return reserve_memory_special_huge_tlbfs_only(bytes, req_addr, exec); |
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|
3645 } else { |
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3646 return reserve_memory_special_huge_tlbfs_mixed(bytes, alignment, req_addr, exec); |
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|
3647 } |
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|
3648 } |
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|
3649 |
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3650 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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3651 assert(UseLargePages, "only for large pages"); |
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|
3652 |
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|
3653 char* addr; |
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|
3654 if (UseSHM) { |
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|
3655 addr = os::Linux::reserve_memory_special_shm(bytes, alignment, req_addr, exec); |
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|
3656 } else { |
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|
3657 assert(UseHugeTLBFS, "must be"); |
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|
3658 addr = os::Linux::reserve_memory_special_huge_tlbfs(bytes, alignment, req_addr, exec); |
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|
3659 } |
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|
3660 |
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|
3661 if (addr != NULL) { |
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|
3662 if (UseNUMAInterleaving) { |
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|
3663 numa_make_global(addr, bytes); |
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|
3664 } |
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|
3665 |
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|
3666 // The memory is committed |
20360 | 3667 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); |
12110
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|
3668 } |
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|
3669 |
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|
3670 return addr; |
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changeset
|
3671 } |
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|
3672 |
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|
3673 bool os::Linux::release_memory_special_shm(char* base, size_t bytes) { |
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|
3674 // detaching the SHM segment will also delete it, see reserve_memory_special_shm() |
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|
3675 return shmdt(base) == 0; |
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|
3676 } |
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|
3677 |
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|
3678 bool os::Linux::release_memory_special_huge_tlbfs(char* base, size_t bytes) { |
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|
3679 return pd_release_memory(base, bytes); |
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|
3680 } |
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|
3681 |
0 | 3682 bool os::release_memory_special(char* base, size_t bytes) { |
20360 | 3683 bool res; |
3684 if (MemTracker::tracking_level() > NMT_minimal) { | |
3685 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); | |
3686 res = os::Linux::release_memory_special_impl(base, bytes); | |
3687 if (res) { | |
3688 tkr.record((address)base, bytes); | |
3689 } | |
3690 | |
3691 } else { | |
3692 res = os::Linux::release_memory_special_impl(base, bytes); | |
3693 } | |
3694 return res; | |
3695 } | |
3696 | |
3697 bool os::Linux::release_memory_special_impl(char* base, size_t bytes) { | |
12110
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|
3698 assert(UseLargePages, "only for large pages"); |
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|
3699 bool res; |
20360 | 3700 |
12110
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|
3701 if (UseSHM) { |
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|
3702 res = os::Linux::release_memory_special_shm(base, bytes); |
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|
3703 } else { |
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|
3704 assert(UseHugeTLBFS, "must be"); |
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|
3705 res = os::Linux::release_memory_special_huge_tlbfs(base, bytes); |
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|
3706 } |
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|
3707 return res; |
0 | 3708 } |
3709 | |
3710 size_t os::large_page_size() { | |
3711 return _large_page_size; | |
3712 } | |
3713 | |
12110
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|
3714 // With SysV SHM the entire memory region must be allocated as shared |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
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diff
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|
3715 // memory. |
12110
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|
3716 // HugeTLBFS allows application to commit large page memory on demand. |
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|
3717 // However, when committing memory with HugeTLBFS fails, the region |
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|
3718 // that was supposed to be committed will lose the old reservation |
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|
3719 // and allow other threads to steal that memory region. Because of this |
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changeset
|
3720 // behavior we can't commit HugeTLBFS memory. |
0 | 3721 bool os::can_commit_large_page_memory() { |
12110
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|
3722 return UseTransparentHugePages; |
0 | 3723 } |
3724 | |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3725 bool os::can_execute_large_page_memory() { |
12110
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|
3726 return UseTransparentHugePages || UseHugeTLBFS; |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3727 } |
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6642862: Code cache allocation fails with large pages after 6588638
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diff
changeset
|
3728 |
0 | 3729 // Reserve memory at an arbitrary address, only if that area is |
3730 // available (and not reserved for something else). | |
3731 | |
6197 | 3732 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3733 const int max_tries = 10; |
3734 char* base[max_tries]; | |
3735 size_t size[max_tries]; | |
3736 const size_t gap = 0x000000; | |
3737 | |
3738 // Assert only that the size is a multiple of the page size, since | |
3739 // that's all that mmap requires, and since that's all we really know | |
3740 // about at this low abstraction level. If we need higher alignment, | |
3741 // we can either pass an alignment to this method or verify alignment | |
3742 // in one of the methods further up the call chain. See bug 5044738. | |
3743 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3744 | |
3745 // Repeatedly allocate blocks until the block is allocated at the | |
3746 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3747 // automatically update _highest_vm_reserved_address if the call is | |
3748 // successful. The variable tracks the highest memory address every reserved | |
3749 // by JVM. It is used to detect heap-stack collision if running with | |
3750 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3751 // space than needed, it could confuse the collision detecting code. To | |
3752 // solve the problem, save current _highest_vm_reserved_address and | |
3753 // calculate the correct value before return. | |
3754 address old_highest = _highest_vm_reserved_address; | |
3755 | |
3756 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3757 // if kernel honors the hint then we can return immediately. | |
3758 char * addr = anon_mmap(requested_addr, bytes, false); | |
3759 if (addr == requested_addr) { | |
3760 return requested_addr; | |
3761 } | |
3762 | |
3763 if (addr != NULL) { | |
3764 // mmap() is successful but it fails to reserve at the requested address | |
3765 anon_munmap(addr, bytes); | |
3766 } | |
3767 | |
3768 int i; | |
3769 for (i = 0; i < max_tries; ++i) { | |
3770 base[i] = reserve_memory(bytes); | |
3771 | |
3772 if (base[i] != NULL) { | |
3773 // Is this the block we wanted? | |
3774 if (base[i] == requested_addr) { | |
3775 size[i] = bytes; | |
3776 break; | |
3777 } | |
3778 | |
3779 // Does this overlap the block we wanted? Give back the overlapped | |
3780 // parts and try again. | |
3781 | |
3782 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3783 if (top_overlap >= 0 && top_overlap < bytes) { | |
3784 unmap_memory(base[i], top_overlap); | |
3785 base[i] += top_overlap; | |
3786 size[i] = bytes - top_overlap; | |
3787 } else { | |
3788 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3789 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3790 unmap_memory(requested_addr, bottom_overlap); | |
3791 size[i] = bytes - bottom_overlap; | |
3792 } else { | |
3793 size[i] = bytes; | |
3794 } | |
3795 } | |
3796 } | |
3797 } | |
3798 | |
3799 // Give back the unused reserved pieces. | |
3800 | |
3801 for (int j = 0; j < i; ++j) { | |
3802 if (base[j] != NULL) { | |
3803 unmap_memory(base[j], size[j]); | |
3804 } | |
3805 } | |
3806 | |
3807 if (i < max_tries) { | |
3808 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3809 return requested_addr; | |
3810 } else { | |
3811 _highest_vm_reserved_address = old_highest; | |
3812 return NULL; | |
3813 } | |
3814 } | |
3815 | |
3816 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3817 return ::read(fd, buf, nBytes); | |
3818 } | |
3819 | |
3820 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3821 // Solaris uses poll(), linux uses park(). | |
3822 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3823 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3824 // SIGSEGV, see 4355769. | |
3825 | |
3826 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3827 assert(thread == Thread::current(), "thread consistency check"); | |
3828 | |
3829 ParkEvent * const slp = thread->_SleepEvent ; | |
3830 slp->reset() ; | |
3831 OrderAccess::fence() ; | |
3832 | |
3833 if (interruptible) { | |
3834 jlong prevtime = javaTimeNanos(); | |
3835 | |
3836 for (;;) { | |
3837 if (os::is_interrupted(thread, true)) { | |
3838 return OS_INTRPT; | |
3839 } | |
3840 | |
3841 jlong newtime = javaTimeNanos(); | |
3842 | |
3843 if (newtime - prevtime < 0) { | |
3844 // time moving backwards, should only happen if no monotonic clock | |
3845 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3846 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3847 } else { | |
4712
e7dead7e90af
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4082
diff
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|
3848 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3849 } |
3850 | |
3851 if(millis <= 0) { | |
3852 return OS_OK; | |
3853 } | |
3854 | |
3855 prevtime = newtime; | |
3856 | |
3857 { | |
3858 assert(thread->is_Java_thread(), "sanity check"); | |
3859 JavaThread *jt = (JavaThread *) thread; | |
3860 ThreadBlockInVM tbivm(jt); | |
3861 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3862 | |
3863 jt->set_suspend_equivalent(); | |
3864 // cleared by handle_special_suspend_equivalent_condition() or | |
3865 // java_suspend_self() via check_and_wait_while_suspended() | |
3866 | |
3867 slp->park(millis); | |
3868 | |
3869 // were we externally suspended while we were waiting? | |
3870 jt->check_and_wait_while_suspended(); | |
3871 } | |
3872 } | |
3873 } else { | |
3874 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3875 jlong prevtime = javaTimeNanos(); | |
3876 | |
3877 for (;;) { | |
3878 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3879 // the 1st iteration ... | |
3880 jlong newtime = javaTimeNanos(); | |
3881 | |
3882 if (newtime - prevtime < 0) { | |
3883 // time moving backwards, should only happen if no monotonic clock | |
3884 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3885 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3886 } else { | |
4712
e7dead7e90af
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diff
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|
3887 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3888 } |
3889 | |
3890 if(millis <= 0) break ; | |
3891 | |
3892 prevtime = newtime; | |
3893 slp->park(millis); | |
3894 } | |
3895 return OS_OK ; | |
3896 } | |
3897 } | |
3898 | |
14291
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diff
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|
3899 // |
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|
3900 // Short sleep, direct OS call. |
5944dba4badc
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|
3901 // |
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|
3902 // Note: certain versions of Linux CFS scheduler (since 2.6.23) do not guarantee |
5944dba4badc
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|
3903 // sched_yield(2) will actually give up the CPU: |
5944dba4badc
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diff
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|
3904 // |
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|
3905 // * Alone on this pariticular CPU, keeps running. |
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|
3906 // * Before the introduction of "skip_buddy" with "compat_yield" disabled |
5944dba4badc
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diff
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|
3907 // (pre 2.6.39). |
5944dba4badc
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|
3908 // |
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|
3909 // So calling this with 0 is an alternative. |
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|
3910 // |
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changeset
|
3911 void os::naked_short_sleep(jlong ms) { |
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3912 struct timespec req; |
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3913 |
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3914 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
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3915 req.tv_sec = 0; |
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3916 if (ms > 0) { |
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3917 req.tv_nsec = (ms % 1000) * 1000000; |
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3918 } |
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3919 else { |
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3920 req.tv_nsec = 1; |
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3921 } |
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3922 |
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3923 nanosleep(&req, NULL); |
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3924 |
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3925 return; |
0 | 3926 } |
3927 | |
3928 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3929 void os::infinite_sleep() { | |
3930 while (true) { // sleep forever ... | |
3931 ::sleep(100); // ... 100 seconds at a time | |
3932 } | |
3933 } | |
3934 | |
3935 // Used to convert frequent JVM_Yield() to nops | |
3936 bool os::dont_yield() { | |
3937 return DontYieldALot; | |
3938 } | |
3939 | |
3940 void os::yield() { | |
3941 sched_yield(); | |
3942 } | |
3943 | |
3944 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3945 | |
3946 void os::yield_all(int attempts) { | |
3947 // Yields to all threads, including threads with lower priorities | |
3948 // Threads on Linux are all with same priority. The Solaris style | |
3949 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3950 sched_yield(); | |
3951 } | |
3952 | |
3953 // Called from the tight loops to possibly influence time-sharing heuristics | |
3954 void os::loop_breaker(int attempts) { | |
3955 os::yield_all(attempts); | |
3956 } | |
3957 | |
3958 //////////////////////////////////////////////////////////////////////////////// | |
3959 // thread priority support | |
3960 | |
3961 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3962 // only supports dynamic priority, static priority must be zero. For real-time | |
3963 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3964 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3965 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3966 // of 5 runs - Sep 2005). | |
3967 // | |
3968 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3969 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3970 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3971 // threads. It has always been the case, but could change in the future. For | |
3972 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3973 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3974 | |
4854
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3975 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3976 19, // 0 Entry should never be used |
3977 | |
3978 4, // 1 MinPriority | |
3979 3, // 2 | |
3980 2, // 3 | |
3981 | |
3982 1, // 4 | |
3983 0, // 5 NormPriority | |
3984 -1, // 6 | |
3985 | |
3986 -2, // 7 | |
3987 -3, // 8 | |
3988 -4, // 9 NearMaxPriority | |
3989 | |
4854
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3990 -5, // 10 MaxPriority |
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3991 |
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3992 -5 // 11 CriticalPriority |
0 | 3993 }; |
3994 | |
3995 static int prio_init() { | |
3996 if (ThreadPriorityPolicy == 1) { | |
3997 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3998 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3999 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
4000 if (geteuid() != 0) { | |
4001 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
4002 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
4003 } | |
4004 ThreadPriorityPolicy = 0; | |
4005 } | |
4006 } | |
4854
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4007 if (UseCriticalJavaThreadPriority) { |
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4008 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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4009 } |
0 | 4010 return 0; |
4011 } | |
4012 | |
4013 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
4014 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
4015 | |
4016 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
4017 return (ret == 0) ? OS_OK : OS_ERR; | |
4018 } | |
4019 | |
4020 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
4021 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
4022 *priority_ptr = java_to_os_priority[NormPriority]; | |
4023 return OS_OK; | |
4024 } | |
4025 | |
4026 errno = 0; | |
4027 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
4028 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
4029 } | |
4030 | |
4031 // Hint to the underlying OS that a task switch would not be good. | |
4032 // Void return because it's a hint and can fail. | |
4033 void os::hint_no_preempt() {} | |
4034 | |
4035 //////////////////////////////////////////////////////////////////////////////// | |
4036 // suspend/resume support | |
4037 | |
4038 // the low-level signal-based suspend/resume support is a remnant from the | |
4039 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
4040 // within hotspot. Now there is a single use-case for this: | |
4041 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
4042 // that runs in the watcher thread. | |
4043 // The remaining code is greatly simplified from the more general suspension | |
4044 // code that used to be used. | |
4045 // | |
4046 // The protocol is quite simple: | |
4047 // - suspend: | |
4048 // - sends a signal to the target thread | |
4049 // - polls the suspend state of the osthread using a yield loop | |
4050 // - target thread signal handler (SR_handler) sets suspend state | |
4051 // and blocks in sigsuspend until continued | |
4052 // - resume: | |
4053 // - sets target osthread state to continue | |
4054 // - sends signal to end the sigsuspend loop in the SR_handler | |
4055 // | |
4056 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
4057 // | |
4058 | |
4059 static void resume_clear_context(OSThread *osthread) { | |
4060 osthread->set_ucontext(NULL); | |
4061 osthread->set_siginfo(NULL); | |
4062 } | |
4063 | |
4064 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
4065 osthread->set_ucontext(context); | |
4066 osthread->set_siginfo(siginfo); | |
4067 } | |
4068 | |
4069 // | |
4070 // Handler function invoked when a thread's execution is suspended or | |
4071 // resumed. We have to be careful that only async-safe functions are | |
4072 // called here (Note: most pthread functions are not async safe and | |
4073 // should be avoided.) | |
4074 // | |
4075 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
4076 // interface point of view, but sigwait() prevents the signal hander | |
4077 // from being run. libpthread would get very confused by not having | |
4078 // its signal handlers run and prevents sigwait()'s use with the | |
4079 // mutex granting granting signal. | |
4080 // | |
10405 | 4081 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
0 | 4082 // |
4083 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
4084 // Save and restore errno to avoid confusing native code with EINTR | |
4085 // after sigsuspend. | |
4086 int old_errno = errno; | |
4087 | |
4088 Thread* thread = Thread::current(); | |
4089 OSThread* osthread = thread->osthread(); | |
10405 | 4090 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
4091 | |
4092 os::SuspendResume::State current = osthread->sr.state(); | |
4093 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
0 | 4094 suspend_save_context(osthread, siginfo, context); |
4095 | |
10405 | 4096 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
4097 os::SuspendResume::State state = osthread->sr.suspended(); | |
4098 if (state == os::SuspendResume::SR_SUSPENDED) { | |
4099 sigset_t suspend_set; // signals for sigsuspend() | |
4100 | |
4101 // get current set of blocked signals and unblock resume signal | |
4102 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
4103 sigdelset(&suspend_set, SR_signum); | |
4104 | |
4105 sr_semaphore.signal(); | |
4106 // wait here until we are resumed | |
4107 while (1) { | |
4108 sigsuspend(&suspend_set); | |
4109 | |
4110 os::SuspendResume::State result = osthread->sr.running(); | |
4111 if (result == os::SuspendResume::SR_RUNNING) { | |
4112 sr_semaphore.signal(); | |
4113 break; | |
4114 } | |
4115 } | |
4116 | |
4117 } else if (state == os::SuspendResume::SR_RUNNING) { | |
4118 // request was cancelled, continue | |
4119 } else { | |
4120 ShouldNotReachHere(); | |
4121 } | |
0 | 4122 |
4123 resume_clear_context(osthread); | |
10405 | 4124 } else if (current == os::SuspendResume::SR_RUNNING) { |
4125 // request was cancelled, continue | |
4126 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4127 // ignore | |
0 | 4128 } else { |
10405 | 4129 // ignore |
0 | 4130 } |
4131 | |
4132 errno = old_errno; | |
4133 } | |
4134 | |
4135 | |
4136 static int SR_initialize() { | |
4137 struct sigaction act; | |
4138 char *s; | |
4139 /* Get signal number to use for suspend/resume */ | |
4140 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
4141 int sig = ::strtol(s, 0, 10); | |
4142 if (sig > 0 || sig < _NSIG) { | |
4143 SR_signum = sig; | |
4144 } | |
4145 } | |
4146 | |
4147 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
4148 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
4149 | |
4150 sigemptyset(&SR_sigset); | |
4151 sigaddset(&SR_sigset, SR_signum); | |
4152 | |
4153 /* Set up signal handler for suspend/resume */ | |
4154 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
4155 act.sa_handler = (void (*)(int)) SR_handler; | |
4156 | |
4157 // SR_signum is blocked by default. | |
4158 // 4528190 - We also need to block pthread restart signal (32 on all | |
4159 // supported Linux platforms). Note that LinuxThreads need to block | |
4160 // this signal for all threads to work properly. So we don't have | |
4161 // to use hard-coded signal number when setting up the mask. | |
4162 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
4163 | |
4164 if (sigaction(SR_signum, &act, 0) == -1) { | |
4165 return -1; | |
4166 } | |
4167 | |
4168 // Save signal flag | |
4169 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
4170 return 0; | |
4171 } | |
4172 | |
10405 | 4173 static int sr_notify(OSThread* osthread) { |
4174 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
4175 assert_status(status == 0, status, "pthread_kill"); | |
4176 return status; | |
4177 } | |
4178 | |
4179 // "Randomly" selected value for how long we want to spin | |
4180 // before bailing out on suspending a thread, also how often | |
4181 // we send a signal to a thread we want to resume | |
4182 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
4183 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
0 | 4184 |
4185 // returns true on success and false on error - really an error is fatal | |
4186 // but this seems the normal response to library errors | |
4187 static bool do_suspend(OSThread* osthread) { | |
10405 | 4188 assert(osthread->sr.is_running(), "thread should be running"); |
4189 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
4190 | |
0 | 4191 // mark as suspended and send signal |
10405 | 4192 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
4193 // failed to switch, state wasn't running? | |
4194 ShouldNotReachHere(); | |
4195 return false; | |
4196 } | |
4197 | |
4198 if (sr_notify(osthread) != 0) { | |
4199 ShouldNotReachHere(); | |
4200 } | |
4201 | |
4202 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
4203 while (true) { | |
4204 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4205 break; | |
4206 } else { | |
4207 // timeout | |
4208 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
4209 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
4210 return false; | |
4211 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
4212 // make sure that we consume the signal on the semaphore as well | |
4213 sr_semaphore.wait(); | |
4214 break; | |
4215 } else { | |
4216 ShouldNotReachHere(); | |
4217 return false; | |
4218 } | |
0 | 4219 } |
10405 | 4220 } |
4221 | |
4222 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
4223 return true; | |
0 | 4224 } |
4225 | |
4226 static void do_resume(OSThread* osthread) { | |
4227 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 4228 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
4229 | |
4230 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4231 // failed to switch to WAKEUP_REQUEST | |
4232 ShouldNotReachHere(); | |
4233 return; | |
4234 } | |
4235 | |
4236 while (true) { | |
4237 if (sr_notify(osthread) == 0) { | |
4238 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4239 if (osthread->sr.is_running()) { | |
4240 return; | |
4241 } | |
4242 } | |
4243 } else { | |
4244 ShouldNotReachHere(); | |
0 | 4245 } |
4246 } | |
10405 | 4247 |
4248 guarantee(osthread->sr.is_running(), "Must be running!"); | |
0 | 4249 } |
4250 | |
4251 //////////////////////////////////////////////////////////////////////////////// | |
4252 // interrupt support | |
4253 | |
4254 void os::interrupt(Thread* thread) { | |
4255 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4256 "possibility of dangling Thread pointer"); | |
4257 | |
4258 OSThread* osthread = thread->osthread(); | |
4259 | |
4260 if (!osthread->interrupted()) { | |
4261 osthread->set_interrupted(true); | |
4262 // More than one thread can get here with the same value of osthread, | |
4263 // resulting in multiple notifications. We do, however, want the store | |
4264 // to interrupted() to be visible to other threads before we execute unpark(). | |
4265 OrderAccess::fence(); | |
4266 ParkEvent * const slp = thread->_SleepEvent ; | |
4267 if (slp != NULL) slp->unpark() ; | |
4268 } | |
4269 | |
4270 // For JSR166. Unpark even if interrupt status already was set | |
4271 if (thread->is_Java_thread()) | |
4272 ((JavaThread*)thread)->parker()->unpark(); | |
4273 | |
4274 ParkEvent * ev = thread->_ParkEvent ; | |
4275 if (ev != NULL) ev->unpark() ; | |
4276 | |
4277 } | |
4278 | |
4279 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
4280 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4281 "possibility of dangling Thread pointer"); | |
4282 | |
4283 OSThread* osthread = thread->osthread(); | |
4284 | |
4285 bool interrupted = osthread->interrupted(); | |
4286 | |
4287 if (interrupted && clear_interrupted) { | |
4288 osthread->set_interrupted(false); | |
4289 // consider thread->_SleepEvent->reset() ... optional optimization | |
4290 } | |
4291 | |
4292 return interrupted; | |
4293 } | |
4294 | |
4295 /////////////////////////////////////////////////////////////////////////////////// | |
4296 // signal handling (except suspend/resume) | |
4297 | |
4298 // This routine may be used by user applications as a "hook" to catch signals. | |
4299 // The user-defined signal handler must pass unrecognized signals to this | |
4300 // routine, and if it returns true (non-zero), then the signal handler must | |
4301 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
4302 // routine will never retun false (zero), but instead will execute a VM panic | |
4303 // routine kill the process. | |
4304 // | |
4305 // If this routine returns false, it is OK to call it again. This allows | |
4306 // the user-defined signal handler to perform checks either before or after | |
4307 // the VM performs its own checks. Naturally, the user code would be making | |
4308 // a serious error if it tried to handle an exception (such as a null check | |
4309 // or breakpoint) that the VM was generating for its own correct operation. | |
4310 // | |
4311 // This routine may recognize any of the following kinds of signals: | |
4312 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
4313 // It should be consulted by handlers for any of those signals. | |
4314 // | |
4315 // The caller of this routine must pass in the three arguments supplied | |
4316 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
4317 // field of the structure passed to sigaction(). This routine assumes that | |
4318 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
4319 // | |
4320 // Note that the VM will print warnings if it detects conflicting signal | |
4321 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
4322 // | |
2191 | 4323 extern "C" JNIEXPORT int |
0 | 4324 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
4325 void* ucontext, int abort_if_unrecognized); | |
4326 | |
4327 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
4328 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 4329 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 4330 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 4331 errno = orig_errno; |
0 | 4332 } |
4333 | |
4334 | |
4335 // This boolean allows users to forward their own non-matching signals | |
4336 // to JVM_handle_linux_signal, harmlessly. | |
4337 bool os::Linux::signal_handlers_are_installed = false; | |
4338 | |
4339 // For signal-chaining | |
4340 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
4341 unsigned int os::Linux::sigs = 0; | |
4342 bool os::Linux::libjsig_is_loaded = false; | |
4343 typedef struct sigaction *(*get_signal_t)(int); | |
4344 get_signal_t os::Linux::get_signal_action = NULL; | |
4345 | |
4346 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
4347 struct sigaction *actp = NULL; | |
4348 | |
4349 if (libjsig_is_loaded) { | |
4350 // Retrieve the old signal handler from libjsig | |
4351 actp = (*get_signal_action)(sig); | |
4352 } | |
4353 if (actp == NULL) { | |
4354 // Retrieve the preinstalled signal handler from jvm | |
4355 actp = get_preinstalled_handler(sig); | |
4356 } | |
4357 | |
4358 return actp; | |
4359 } | |
4360 | |
4361 static bool call_chained_handler(struct sigaction *actp, int sig, | |
4362 siginfo_t *siginfo, void *context) { | |
4363 // Call the old signal handler | |
4364 if (actp->sa_handler == SIG_DFL) { | |
4365 // It's more reasonable to let jvm treat it as an unexpected exception | |
4366 // instead of taking the default action. | |
4367 return false; | |
4368 } else if (actp->sa_handler != SIG_IGN) { | |
4369 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
4370 // automaticlly block the signal | |
4371 sigaddset(&(actp->sa_mask), sig); | |
4372 } | |
4373 | |
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4374 sa_handler_t hand = NULL; |
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|
4375 sa_sigaction_t sa = NULL; |
0 | 4376 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; |
4377 // retrieve the chained handler | |
4378 if (siginfo_flag_set) { | |
4379 sa = actp->sa_sigaction; | |
4380 } else { | |
4381 hand = actp->sa_handler; | |
4382 } | |
4383 | |
4384 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
4385 actp->sa_handler = SIG_DFL; | |
4386 } | |
4387 | |
4388 // try to honor the signal mask | |
4389 sigset_t oset; | |
4390 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
4391 | |
4392 // call into the chained handler | |
4393 if (siginfo_flag_set) { | |
4394 (*sa)(sig, siginfo, context); | |
4395 } else { | |
4396 (*hand)(sig); | |
4397 } | |
4398 | |
4399 // restore the signal mask | |
4400 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
4401 } | |
4402 // Tell jvm's signal handler the signal is taken care of. | |
4403 return true; | |
4404 } | |
4405 | |
4406 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
4407 bool chained = false; | |
4408 // signal-chaining | |
4409 if (UseSignalChaining) { | |
4410 struct sigaction *actp = get_chained_signal_action(sig); | |
4411 if (actp != NULL) { | |
4412 chained = call_chained_handler(actp, sig, siginfo, context); | |
4413 } | |
4414 } | |
4415 return chained; | |
4416 } | |
4417 | |
4418 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
4419 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
4420 return &sigact[sig]; | |
4421 } | |
4422 return NULL; | |
4423 } | |
4424 | |
4425 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
4426 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4427 sigact[sig] = oldAct; | |
4428 sigs |= (unsigned int)1 << sig; | |
4429 } | |
4430 | |
4431 // for diagnostic | |
4432 int os::Linux::sigflags[MAXSIGNUM]; | |
4433 | |
4434 int os::Linux::get_our_sigflags(int sig) { | |
4435 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4436 return sigflags[sig]; | |
4437 } | |
4438 | |
4439 void os::Linux::set_our_sigflags(int sig, int flags) { | |
4440 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4441 sigflags[sig] = flags; | |
4442 } | |
4443 | |
4444 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
4445 // Check for overwrite. | |
4446 struct sigaction oldAct; | |
4447 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
4448 | |
4449 void* oldhand = oldAct.sa_sigaction | |
4450 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4451 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4452 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
4453 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
4454 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
4455 if (AllowUserSignalHandlers || !set_installed) { | |
4456 // Do not overwrite; user takes responsibility to forward to us. | |
4457 return; | |
4458 } else if (UseSignalChaining) { | |
4459 // save the old handler in jvm | |
4460 save_preinstalled_handler(sig, oldAct); | |
4461 // libjsig also interposes the sigaction() call below and saves the | |
4462 // old sigaction on it own. | |
4463 } else { | |
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4464 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
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4465 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 4466 } |
4467 } | |
4468 | |
4469 struct sigaction sigAct; | |
4470 sigfillset(&(sigAct.sa_mask)); | |
4471 sigAct.sa_handler = SIG_DFL; | |
4472 if (!set_installed) { | |
4473 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4474 } else { | |
4475 sigAct.sa_sigaction = signalHandler; | |
4476 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4477 } | |
4478 // Save flags, which are set by ours | |
4479 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4480 sigflags[sig] = sigAct.sa_flags; | |
4481 | |
4482 int ret = sigaction(sig, &sigAct, &oldAct); | |
4483 assert(ret == 0, "check"); | |
4484 | |
4485 void* oldhand2 = oldAct.sa_sigaction | |
4486 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4487 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4488 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
4489 } | |
4490 | |
4491 // install signal handlers for signals that HotSpot needs to | |
4492 // handle in order to support Java-level exception handling. | |
4493 | |
4494 void os::Linux::install_signal_handlers() { | |
4495 if (!signal_handlers_are_installed) { | |
4496 signal_handlers_are_installed = true; | |
4497 | |
4498 // signal-chaining | |
4499 typedef void (*signal_setting_t)(); | |
4500 signal_setting_t begin_signal_setting = NULL; | |
4501 signal_setting_t end_signal_setting = NULL; | |
4502 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4503 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
4504 if (begin_signal_setting != NULL) { | |
4505 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4506 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
4507 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
4508 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
4509 libjsig_is_loaded = true; | |
4510 assert(UseSignalChaining, "should enable signal-chaining"); | |
4511 } | |
4512 if (libjsig_is_loaded) { | |
4513 // Tell libjsig jvm is setting signal handlers | |
4514 (*begin_signal_setting)(); | |
4515 } | |
4516 | |
4517 set_signal_handler(SIGSEGV, true); | |
4518 set_signal_handler(SIGPIPE, true); | |
4519 set_signal_handler(SIGBUS, true); | |
4520 set_signal_handler(SIGILL, true); | |
4521 set_signal_handler(SIGFPE, true); | |
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4522 #if defined(PPC64) |
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4523 set_signal_handler(SIGTRAP, true); |
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4524 #endif |
0 | 4525 set_signal_handler(SIGXFSZ, true); |
4526 | |
4527 if (libjsig_is_loaded) { | |
4528 // Tell libjsig jvm finishes setting signal handlers | |
4529 (*end_signal_setting)(); | |
4530 } | |
4531 | |
4532 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
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4533 // and if UserSignalHandler is installed all bets are off. |
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4534 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 4535 if (CheckJNICalls) { |
4536 if (libjsig_is_loaded) { | |
3956
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4537 if (PrintJNIResolving) { |
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4538 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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4539 } |
0 | 4540 check_signals = false; |
4541 } | |
4542 if (AllowUserSignalHandlers) { | |
3956
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4543 if (PrintJNIResolving) { |
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4544 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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4545 } |
0 | 4546 check_signals = false; |
4547 } | |
4548 } | |
4549 } | |
4550 } | |
4551 | |
4552 // This is the fastest way to get thread cpu time on Linux. | |
4553 // Returns cpu time (user+sys) for any thread, not only for current. | |
4554 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
4555 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4556 // For reference, please, see IEEE Std 1003.1-2004: | |
4557 // http://www.unix.org/single_unix_specification | |
4558 | |
4559 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4560 struct timespec tp; | |
4561 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4562 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4563 | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
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4564 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4565 } |
4566 | |
4567 ///// | |
4568 // glibc on Linux platform uses non-documented flag | |
4569 // to indicate, that some special sort of signal | |
4570 // trampoline is used. | |
4571 // We will never set this flag, and we should | |
4572 // ignore this flag in our diagnostic | |
4573 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4574 #undef SIGNIFICANT_SIGNAL_MASK | |
4575 #endif | |
4576 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4577 | |
4578 static const char* get_signal_handler_name(address handler, | |
4579 char* buf, int buflen) { | |
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4580 int offset = 0; |
0 | 4581 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); |
4582 if (found) { | |
4583 // skip directory names | |
4584 const char *p1, *p2; | |
4585 p1 = buf; | |
4586 size_t len = strlen(os::file_separator()); | |
4587 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4588 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4589 } else { | |
4590 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4591 } | |
4592 return buf; | |
4593 } | |
4594 | |
4595 static void print_signal_handler(outputStream* st, int sig, | |
4596 char* buf, size_t buflen) { | |
4597 struct sigaction sa; | |
4598 | |
4599 sigaction(sig, NULL, &sa); | |
4600 | |
4601 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4602 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4603 | |
4604 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4605 | |
4606 address handler = (sa.sa_flags & SA_SIGINFO) | |
4607 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4608 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4609 | |
4610 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4611 st->print("SIG_DFL"); | |
4612 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4613 st->print("SIG_IGN"); | |
4614 } else { | |
4615 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4616 } | |
4617 | |
14410 | 4618 st->print(", sa_mask[0]="); |
4619 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
0 | 4620 |
4621 address rh = VMError::get_resetted_sighandler(sig); | |
4622 // May be, handler was resetted by VMError? | |
4623 if(rh != NULL) { | |
4624 handler = rh; | |
4625 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4626 } | |
4627 | |
14410 | 4628 st->print(", sa_flags="); |
4629 os::Posix::print_sa_flags(st, sa.sa_flags); | |
0 | 4630 |
4631 // Check: is it our handler? | |
4632 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4633 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4634 // It is our signal handler | |
4635 // check for flags, reset system-used one! | |
4636 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4637 st->print( | |
4638 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4639 os::Linux::get_our_sigflags(sig)); | |
4640 } | |
4641 } | |
4642 st->cr(); | |
4643 } | |
4644 | |
4645 | |
4646 #define DO_SIGNAL_CHECK(sig) \ | |
4647 if (!sigismember(&check_signal_done, sig)) \ | |
4648 os::Linux::check_signal_handler(sig) | |
4649 | |
4650 // This method is a periodic task to check for misbehaving JNI applications | |
4651 // under CheckJNI, we can add any periodic checks here | |
4652 | |
4653 void os::run_periodic_checks() { | |
4654 | |
4655 if (check_signals == false) return; | |
4656 | |
4657 // SEGV and BUS if overridden could potentially prevent | |
4658 // generation of hs*.log in the event of a crash, debugging | |
4659 // such a case can be very challenging, so we absolutely | |
4660 // check the following for a good measure: | |
4661 DO_SIGNAL_CHECK(SIGSEGV); | |
4662 DO_SIGNAL_CHECK(SIGILL); | |
4663 DO_SIGNAL_CHECK(SIGFPE); | |
4664 DO_SIGNAL_CHECK(SIGBUS); | |
4665 DO_SIGNAL_CHECK(SIGPIPE); | |
4666 DO_SIGNAL_CHECK(SIGXFSZ); | |
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4667 #if defined(PPC64) |
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4668 DO_SIGNAL_CHECK(SIGTRAP); |
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4669 #endif |
0 | 4670 |
4671 // ReduceSignalUsage allows the user to override these handlers | |
4672 // see comments at the very top and jvm_solaris.h | |
4673 if (!ReduceSignalUsage) { | |
4674 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4675 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4676 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4677 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4678 } | |
4679 | |
4680 DO_SIGNAL_CHECK(SR_signum); | |
4681 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4682 } | |
4683 | |
4684 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4685 | |
4686 static os_sigaction_t os_sigaction = NULL; | |
4687 | |
4688 void os::Linux::check_signal_handler(int sig) { | |
4689 char buf[O_BUFLEN]; | |
4690 address jvmHandler = NULL; | |
4691 | |
4692 | |
4693 struct sigaction act; | |
4694 if (os_sigaction == NULL) { | |
4695 // only trust the default sigaction, in case it has been interposed | |
4696 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4697 if (os_sigaction == NULL) return; | |
4698 } | |
4699 | |
4700 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4701 | |
4702 | |
4703 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4704 | |
4705 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4706 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4707 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4708 | |
4709 | |
4710 switch(sig) { | |
4711 case SIGSEGV: | |
4712 case SIGBUS: | |
4713 case SIGFPE: | |
4714 case SIGPIPE: | |
4715 case SIGILL: | |
4716 case SIGXFSZ: | |
4717 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4718 break; | |
4719 | |
4720 case SHUTDOWN1_SIGNAL: | |
4721 case SHUTDOWN2_SIGNAL: | |
4722 case SHUTDOWN3_SIGNAL: | |
4723 case BREAK_SIGNAL: | |
4724 jvmHandler = (address)user_handler(); | |
4725 break; | |
4726 | |
4727 case INTERRUPT_SIGNAL: | |
4728 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4729 break; | |
4730 | |
4731 default: | |
4732 if (sig == SR_signum) { | |
4733 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4734 } else { | |
4735 return; | |
4736 } | |
4737 break; | |
4738 } | |
4739 | |
4740 if (thisHandler != jvmHandler) { | |
4741 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4742 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4743 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4744 // No need to check this sig any longer | |
4745 sigaddset(&check_signal_done, sig); | |
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4746 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN |
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4747 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { |
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diff
changeset
|
4748 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", |
bbceafdc7a5f
6536943: Bogus -Xcheck:jni warning for SIG_INT action for SIGINT in JVM started from non-interactive shell
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|
4749 exception_name(sig, buf, O_BUFLEN)); |
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4750 } |
0 | 4751 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { |
4752 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4753 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4754 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4755 // No need to check this sig any longer | |
4756 sigaddset(&check_signal_done, sig); | |
4757 } | |
4758 | |
4759 // Dump all the signal | |
4760 if (sigismember(&check_signal_done, sig)) { | |
4761 print_signal_handlers(tty, buf, O_BUFLEN); | |
4762 } | |
4763 } | |
4764 | |
4765 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4766 | |
4767 extern bool signal_name(int signo, char* buf, size_t len); | |
4768 | |
4769 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4770 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4771 // signal | |
4772 if (!signal_name(exception_code, buf, size)) { | |
4773 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4774 } | |
4775 return buf; | |
4776 } else { | |
4777 return NULL; | |
4778 } | |
4779 } | |
4780 | |
4781 // this is called _before_ the most of global arguments have been parsed | |
4782 void os::init(void) { | |
4783 char dummy; /* used to get a guess on initial stack address */ | |
4784 // first_hrtime = gethrtime(); | |
4785 | |
4786 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4787 // is different than the pid of the java launcher thread. | |
4788 // So, on Linux, the launcher thread pid is passed to the VM | |
4789 // via the sun.java.launcher.pid property. | |
4790 // Use this property instead of getpid() if it was correctly passed. | |
4791 // See bug 6351349. | |
4792 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4793 | |
4794 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4795 | |
4796 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4797 | |
4798 init_random(1234567); | |
4799 | |
4800 ThreadCritical::initialize(); | |
4801 | |
4802 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4803 if (Linux::page_size() == -1) { | |
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4804 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
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|
4805 strerror(errno))); |
0 | 4806 } |
4807 init_page_sizes((size_t) Linux::page_size()); | |
4808 | |
4809 Linux::initialize_system_info(); | |
4810 | |
4811 // main_thread points to the aboriginal thread | |
4812 Linux::_main_thread = pthread_self(); | |
4813 | |
4814 Linux::clock_init(); | |
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12840
diff
changeset
|
4815 initial_time_count = javaTimeNanos(); |
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4816 |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4817 // pthread_condattr initialization for monotonic clock |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4818 int status; |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4819 pthread_condattr_t* _condattr = os::Linux::condAttr(); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4820 if ((status = pthread_condattr_init(_condattr)) != 0) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4821 fatal(err_msg("pthread_condattr_init: %s", strerror(status))); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4822 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4823 // Only set the clock if CLOCK_MONOTONIC is available |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4824 if (Linux::supports_monotonic_clock()) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4825 if ((status = pthread_condattr_setclock(_condattr, CLOCK_MONOTONIC)) != 0) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4826 if (status == EINVAL) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4827 warning("Unable to use monotonic clock with relative timed-waits" \ |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4828 " - changes to the time-of-day clock may have adverse affects"); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4829 } else { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4830 fatal(err_msg("pthread_condattr_setclock: %s", strerror(status))); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4831 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4832 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4833 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4834 // else it defaults to CLOCK_REALTIME |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4835 |
242 | 4836 pthread_mutex_init(&dl_mutex, NULL); |
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4837 |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4838 // If the pagesize of the VM is greater than 8K determine the appropriate |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4839 // number of initial guard pages. The user can change this with the |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4840 // command line arguments, if needed. |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4841 if (vm_page_size() > (int)Linux::vm_default_page_size()) { |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4842 StackYellowPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4843 StackRedPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4844 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4845 } |
0 | 4846 } |
4847 | |
4848 // To install functions for atexit system call | |
4849 extern "C" { | |
4850 static void perfMemory_exit_helper() { | |
4851 perfMemory_exit(); | |
4852 } | |
4853 } | |
4854 | |
4855 // this is called _after_ the global arguments have been parsed | |
4856 jint os::init_2(void) | |
4857 { | |
4858 Linux::fast_thread_clock_init(); | |
4859 | |
4860 // Allocate a single page and mark it as readable for safepoint polling | |
4861 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4862 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4863 | |
4864 os::set_polling_page( polling_page ); | |
4865 | |
4866 #ifndef PRODUCT | |
4867 if(Verbose && PrintMiscellaneous) | |
4868 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4869 #endif | |
4870 | |
4871 if (!UseMembar) { | |
4872 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
4873 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
0 | 4874 os::set_memory_serialize_page( mem_serialize_page ); |
4875 | |
4876 #ifndef PRODUCT | |
4877 if(Verbose && PrintMiscellaneous) | |
4878 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4879 #endif | |
4880 } | |
4881 | |
4882 // initialize suspend/resume support - must do this before signal_sets_init() | |
4883 if (SR_initialize() != 0) { | |
4884 perror("SR_initialize failed"); | |
4885 return JNI_ERR; | |
4886 } | |
4887 | |
4888 Linux::signal_sets_init(); | |
4889 Linux::install_signal_handlers(); | |
4890 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4891 // Check minimum allowable stack size for thread creation and to initialize |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4892 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4893 // size. Add a page for compiler2 recursion in main thread. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4894 // Add in 2*BytesPerWord times page size to account for VM stack during |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4895 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4896 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4897 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() + |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4898 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size()); |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4899 |
0 | 4900 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4901 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4902 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4903 tty->print_cr("\nThe stack size specified is too small, " |
4904 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4905 os::Linux::min_stack_allowed/ K); |
0 | 4906 return JNI_ERR; |
4907 } | |
4908 | |
4909 // Make the stack size a multiple of the page size so that | |
4910 // the yellow/red zones can be guarded. | |
4911 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4912 vm_page_size())); | |
4913 | |
4914 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4915 | |
12313
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4916 #if defined(IA32) |
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4917 workaround_expand_exec_shield_cs_limit(); |
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4918 #endif |
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4919 |
0 | 4920 Linux::libpthread_init(); |
4921 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4922 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4923 Linux::glibc_version(), Linux::libpthread_version(), | |
4924 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4925 } | |
4926 | |
141 | 4927 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4928 if (!Linux::libnuma_init()) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4929 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4930 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4931 if ((Linux::numa_max_node() < 1)) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4932 // There's only one node(they start from 0), disable NUMA. |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4933 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4934 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4935 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4936 // With SHM and HugeTLBFS large pages we cannot uncommit a page, so there's no way |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4937 // we can make the adaptive lgrp chunk resizing work. If the user specified |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4938 // both UseNUMA and UseLargePages (or UseSHM/UseHugeTLBFS) on the command line - warn and |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4939 // disable adaptive resizing. |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4940 if (UseNUMA && UseLargePages && !can_commit_large_page_memory()) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4941 if (FLAG_IS_DEFAULT(UseNUMA)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4942 UseNUMA = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4943 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4944 if (FLAG_IS_DEFAULT(UseLargePages) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4945 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4946 FLAG_IS_DEFAULT(UseHugeTLBFS)) { |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4947 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4948 } else { |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4949 warning("UseNUMA is not fully compatible with SHM/HugeTLBFS large pages, disabling adaptive resizing"); |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4950 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4951 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4952 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4953 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4954 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4955 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4956 UseNUMA = true; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4957 } |
141 | 4958 } |
4959 | |
0 | 4960 if (MaxFDLimit) { |
4961 // set the number of file descriptors to max. print out error | |
4962 // if getrlimit/setrlimit fails but continue regardless. | |
4963 struct rlimit nbr_files; | |
4964 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4965 if (status != 0) { | |
4966 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4967 perror("os::init_2 getrlimit failed"); | |
4968 } else { | |
4969 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4970 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4971 if (status != 0) { | |
4972 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4973 perror("os::init_2 setrlimit failed"); | |
4974 } | |
4975 } | |
4976 } | |
4977 | |
4978 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4979 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4980 | |
4981 // at-exit methods are called in the reverse order of their registration. | |
4982 // atexit functions are called on return from main or as a result of a | |
4983 // call to exit(3C). There can be only 32 of these functions registered | |
4984 // and atexit() does not set errno. | |
4985 | |
4986 if (PerfAllowAtExitRegistration) { | |
4987 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4988 // atexit functions can be delayed until process exit time, which | |
4989 // can be problematic for embedded VM situations. Embedded VMs should | |
4990 // call DestroyJavaVM() to assure that VM resources are released. | |
4991 | |
4992 // note: perfMemory_exit_helper atexit function may be removed in | |
4993 // the future if the appropriate cleanup code can be added to the | |
4994 // VM_Exit VMOperation's doit method. | |
4995 if (atexit(perfMemory_exit_helper) != 0) { | |
14391 | 4996 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
0 | 4997 } |
4998 } | |
4999 | |
5000 // initialize thread priority policy | |
5001 prio_init(); | |
5002 | |
5003 return JNI_OK; | |
5004 } | |
5005 | |
5006 // Mark the polling page as unreadable | |
5007 void os::make_polling_page_unreadable(void) { | |
5008 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
5009 fatal("Could not disable polling page"); | |
5010 }; | |
5011 | |
5012 // Mark the polling page as readable | |
5013 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
5014 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 5015 fatal("Could not enable polling page"); |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
5016 } |
0 | 5017 }; |
5018 | |
5019 int os::active_processor_count() { | |
5020 // Linux doesn't yet have a (official) notion of processor sets, | |
5021 // so just return the number of online processors. | |
5022 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
5023 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
5024 return online_cpus; | |
5025 } | |
5026 | |
4006 | 5027 void os::set_native_thread_name(const char *name) { |
5028 // Not yet implemented. | |
5029 return; | |
5030 } | |
5031 | |
0 | 5032 bool os::distribute_processes(uint length, uint* distribution) { |
5033 // Not yet implemented. | |
5034 return false; | |
5035 } | |
5036 | |
5037 bool os::bind_to_processor(uint processor_id) { | |
5038 // Not yet implemented. | |
5039 return false; | |
5040 } | |
5041 | |
5042 /// | |
5043 | |
10405 | 5044 void os::SuspendedThreadTask::internal_do_task() { |
5045 if (do_suspend(_thread->osthread())) { | |
5046 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
5047 do_task(context); | |
5048 do_resume(_thread->osthread()); | |
5049 } | |
5050 } | |
5051 | |
5052 class PcFetcher : public os::SuspendedThreadTask { | |
5053 public: | |
5054 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
5055 ExtendedPC result(); | |
5056 protected: | |
5057 void do_task(const os::SuspendedThreadTaskContext& context); | |
5058 private: | |
5059 ExtendedPC _epc; | |
5060 }; | |
5061 | |
5062 ExtendedPC PcFetcher::result() { | |
5063 guarantee(is_done(), "task is not done yet."); | |
5064 return _epc; | |
5065 } | |
5066 | |
5067 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
5068 Thread* thread = context.thread(); | |
5069 OSThread* osthread = thread->osthread(); | |
5070 if (osthread->ucontext() != NULL) { | |
5071 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
5072 } else { | |
5073 // NULL context is unexpected, double-check this is the VMThread | |
5074 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
5075 } | |
5076 } | |
5077 | |
0 | 5078 // Suspends the target using the signal mechanism and then grabs the PC before |
5079 // resuming the target. Used by the flat-profiler only | |
5080 ExtendedPC os::get_thread_pc(Thread* thread) { | |
5081 // Make sure that it is called by the watcher for the VMThread | |
5082 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
5083 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
5084 | |
10405 | 5085 PcFetcher fetcher(thread); |
5086 fetcher.run(); | |
5087 return fetcher.result(); | |
0 | 5088 } |
5089 | |
5090 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
5091 { | |
5092 if (is_NPTL()) { | |
5093 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5094 } else { | |
5095 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
5096 // word back to default 64bit precision if condvar is signaled. Java | |
5097 // wants 53bit precision. Save and restore current value. | |
5098 int fpu = get_fpu_control_word(); | |
5099 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5100 set_fpu_control_word(fpu); | |
5101 return status; | |
5102 } | |
5103 } | |
5104 | |
5105 //////////////////////////////////////////////////////////////////////////////// | |
5106 // debug support | |
5107 | |
1681
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5108 bool os::find(address addr, outputStream* st) { |
0 | 5109 Dl_info dlinfo; |
5110 memset(&dlinfo, 0, sizeof(dlinfo)); | |
11092
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|
5111 if (dladdr(addr, &dlinfo) != 0) { |
1681
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|
5112 st->print(PTR_FORMAT ": ", addr); |
11092
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|
5113 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
1681
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|
5114 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 5115 addr - (intptr_t)dlinfo.dli_saddr); |
11092
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|
5116 } else if (dlinfo.dli_fbase != NULL) { |
1681
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|
5117 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 5118 } else { |
1681
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|
5119 st->print("<absolute address>"); |
0 | 5120 } |
11092
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|
5121 if (dlinfo.dli_fname != NULL) { |
1681
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5122 st->print(" in %s", dlinfo.dli_fname); |
0 | 5123 } |
11092
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|
5124 if (dlinfo.dli_fbase != NULL) { |
1681
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5125 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 5126 } |
1681
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|
5127 st->cr(); |
0 | 5128 |
5129 if (Verbose) { | |
5130 // decode some bytes around the PC | |
9060
cc32ccaaf47f
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mikael
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9059
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changeset
|
5131 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
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mikael
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|
5132 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 5133 address lowest = (address) dlinfo.dli_sname; |
5134 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
5135 if (begin < lowest) begin = lowest; | |
5136 Dl_info dlinfo2; | |
11092
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|
5137 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
0 | 5138 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
5139 end = (address) dlinfo2.dli_saddr; | |
1681
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|
5140 Disassembler::decode(begin, end, st); |
0 | 5141 } |
5142 return true; | |
5143 } | |
5144 return false; | |
5145 } | |
5146 | |
5147 //////////////////////////////////////////////////////////////////////////////// | |
5148 // misc | |
5149 | |
5150 // This does not do anything on Linux. This is basically a hook for being | |
5151 // able to use structured exception handling (thread-local exception filters) | |
5152 // on, e.g., Win32. | |
5153 void | |
5154 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
5155 JavaCallArguments* args, Thread* thread) { | |
5156 f(value, method, args, thread); | |
5157 } | |
5158 | |
5159 void os::print_statistics() { | |
5160 } | |
5161 | |
5162 int os::message_box(const char* title, const char* message) { | |
5163 int i; | |
5164 fdStream err(defaultStream::error_fd()); | |
5165 for (i = 0; i < 78; i++) err.print_raw("="); | |
5166 err.cr(); | |
5167 err.print_raw_cr(title); | |
5168 for (i = 0; i < 78; i++) err.print_raw("-"); | |
5169 err.cr(); | |
5170 err.print_raw_cr(message); | |
5171 for (i = 0; i < 78; i++) err.print_raw("="); | |
5172 err.cr(); | |
5173 | |
5174 char buf[16]; | |
5175 // Prevent process from exiting upon "read error" without consuming all CPU | |
5176 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
5177 | |
5178 return buf[0] == 'y' || buf[0] == 'Y'; | |
5179 } | |
5180 | |
5181 int os::stat(const char *path, struct stat *sbuf) { | |
5182 char pathbuf[MAX_PATH]; | |
5183 if (strlen(path) > MAX_PATH - 1) { | |
5184 errno = ENAMETOOLONG; | |
5185 return -1; | |
5186 } | |
1980
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|
5187 os::native_path(strcpy(pathbuf, path)); |
0 | 5188 return ::stat(pathbuf, sbuf); |
5189 } | |
5190 | |
5191 bool os::check_heap(bool force) { | |
5192 return true; | |
5193 } | |
5194 | |
5195 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
5196 return ::vsnprintf(buf, count, format, args); | |
5197 } | |
5198 | |
5199 // Is a (classpath) directory empty? | |
5200 bool os::dir_is_empty(const char* path) { | |
5201 DIR *dir = NULL; | |
5202 struct dirent *ptr; | |
5203 | |
5204 dir = opendir(path); | |
5205 if (dir == NULL) return true; | |
5206 | |
5207 /* Scan the directory */ | |
5208 bool result = true; | |
5209 char buf[sizeof(struct dirent) + MAX_PATH]; | |
5210 while (result && (ptr = ::readdir(dir)) != NULL) { | |
5211 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
5212 result = false; | |
5213 } | |
5214 } | |
5215 closedir(dir); | |
5216 return result; | |
5217 } | |
5218 | |
1980
828eafbd85cc
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5219 // This code originates from JDK's sysOpen and open64_w |
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diff
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5220 // from src/solaris/hpi/src/system_md.c |
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|
5221 |
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|
5222 #ifndef O_DELETE |
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|
5223 #define O_DELETE 0x10000 |
828eafbd85cc
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diff
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|
5224 #endif |
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|
5225 |
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|
5226 // Open a file. Unlink the file immediately after open returns |
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diff
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|
5227 // if the specified oflag has the O_DELETE flag set. |
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diff
changeset
|
5228 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
828eafbd85cc
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ikrylov
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diff
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|
5229 |
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diff
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|
5230 int os::open(const char *path, int oflag, int mode) { |
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diff
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|
5231 |
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diff
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|
5232 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
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diff
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|
5233 errno = ENAMETOOLONG; |
828eafbd85cc
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1972
diff
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|
5234 return -1; |
828eafbd85cc
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1972
diff
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|
5235 } |
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diff
changeset
|
5236 int fd; |
828eafbd85cc
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diff
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|
5237 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5238 oflag = oflag & ~O_DELETE; |
828eafbd85cc
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1972
diff
changeset
|
5239 |
828eafbd85cc
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diff
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|
5240 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5241 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5242 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5243 //If the open succeeded, the file might still be a directory |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5244 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5245 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5246 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5247 int st_mode = buf64.st_mode; |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5248 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
5249 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5250 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5251 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5252 ::close(fd); |
828eafbd85cc
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1972
diff
changeset
|
5253 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
5254 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5255 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5256 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5257 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5258 } |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5259 } |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5260 |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5261 /* |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5262 * All file descriptors that are opened in the JVM and not |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5263 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5264 * close-on-exec flag set. If we don't set it, then careless 3rd |
828eafbd85cc
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ikrylov
parents:
1972
diff
changeset
|
5265 * party native code might fork and exec without closing all |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5266 * appropriate file descriptors (e.g. as we do in closeDescriptors in |
828eafbd85cc
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ikrylov
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diff
changeset
|
5267 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5268 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5269 * - cause end-of-file to fail to be detected on some file |
828eafbd85cc
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ikrylov
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diff
changeset
|
5270 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5271 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5272 * - might cause an fopen in the subprocess to fail on a system |
828eafbd85cc
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ikrylov
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diff
changeset
|
5273 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5274 * |
828eafbd85cc
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diff
changeset
|
5275 * (Yes, the default setting of the close-on-exec flag is a Unix |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
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diff
changeset
|
5276 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5277 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5278 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5279 * 1085341: 32-bit stdio routines should support file descriptors >255 |
828eafbd85cc
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ikrylov
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diff
changeset
|
5280 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5281 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
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diff
changeset
|
5282 */ |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5283 #ifdef FD_CLOEXEC |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5284 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5285 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5286 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5287 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5288 } |
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ikrylov
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diff
changeset
|
5289 #endif |
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6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5290 |
828eafbd85cc
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diff
changeset
|
5291 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5292 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5293 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
5294 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5295 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5296 |
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|
5297 |
0 | 5298 // create binary file, rewriting existing file if required |
5299 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
5300 int oflags = O_WRONLY | O_CREAT; | |
5301 if (!rewrite_existing) { | |
5302 oflags |= O_EXCL; | |
5303 } | |
5304 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
5305 } | |
5306 | |
5307 // return current position of file pointer | |
5308 jlong os::current_file_offset(int fd) { | |
5309 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
5310 } | |
5311 | |
5312 // move file pointer to the specified offset | |
5313 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
5314 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
5315 } | |
5316 | |
1980
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|
5317 // This code originates from JDK's sysAvailable |
828eafbd85cc
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|
5318 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
828eafbd85cc
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ikrylov
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changeset
|
5319 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5320 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
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ikrylov
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diff
changeset
|
5321 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
5322 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5323 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5324 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5325 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5326 mode = buf64.st_mode; |
828eafbd85cc
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diff
changeset
|
5327 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5328 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5329 * XXX: is the following call interruptible? If so, this might |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5330 * need to go through the INTERRUPT_IO() wrapper as for other |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5331 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5332 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5333 int n; |
828eafbd85cc
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diff
changeset
|
5334 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5335 *bytes = n; |
828eafbd85cc
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diff
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|
5336 return 1; |
828eafbd85cc
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diff
changeset
|
5337 } |
828eafbd85cc
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diff
changeset
|
5338 } |
828eafbd85cc
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diff
changeset
|
5339 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5340 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
5341 return 0; |
828eafbd85cc
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diff
changeset
|
5342 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
828eafbd85cc
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diff
changeset
|
5343 return 0; |
828eafbd85cc
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diff
changeset
|
5344 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
828eafbd85cc
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1972
diff
changeset
|
5345 return 0; |
828eafbd85cc
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diff
changeset
|
5346 } |
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diff
changeset
|
5347 *bytes = end - cur; |
828eafbd85cc
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diff
changeset
|
5348 return 1; |
828eafbd85cc
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parents:
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diff
changeset
|
5349 } |
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diff
changeset
|
5350 |
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
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diff
changeset
|
5351 int os::socket_available(int fd, jint *pbytes) { |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
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diff
changeset
|
5352 // Linux doc says EINTR not returned, unlike Solaris |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
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diff
changeset
|
5353 int ret = ::ioctl(fd, FIONREAD, pbytes); |
03e1b9fce89d
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dholmes
parents:
2023
diff
changeset
|
5354 |
03e1b9fce89d
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diff
changeset
|
5355 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5356 // is expected to return 0 on failure and 1 on success to the jdk. |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
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diff
changeset
|
5357 return (ret < 0) ? 0 : 1; |
03e1b9fce89d
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dholmes
parents:
2023
diff
changeset
|
5358 } |
03e1b9fce89d
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diff
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|
5359 |
0 | 5360 // Map a block of memory. |
6197 | 5361 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5362 char *addr, size_t bytes, bool read_only, |
5363 bool allow_exec) { | |
5364 int prot; | |
5909 | 5365 int flags = MAP_PRIVATE; |
0 | 5366 |
5367 if (read_only) { | |
5368 prot = PROT_READ; | |
5369 } else { | |
5370 prot = PROT_READ | PROT_WRITE; | |
5371 } | |
5372 | |
5373 if (allow_exec) { | |
5374 prot |= PROT_EXEC; | |
5375 } | |
5376 | |
5377 if (addr != NULL) { | |
5378 flags |= MAP_FIXED; | |
5379 } | |
5380 | |
5381 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
5382 fd, file_offset); | |
5383 if (mapped_address == MAP_FAILED) { | |
5384 return NULL; | |
5385 } | |
5386 return mapped_address; | |
5387 } | |
5388 | |
5389 | |
5390 // Remap a block of memory. | |
6197 | 5391 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5392 char *addr, size_t bytes, bool read_only, |
5393 bool allow_exec) { | |
5394 // same as map_memory() on this OS | |
5395 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
5396 allow_exec); | |
5397 } | |
5398 | |
5399 | |
5400 // Unmap a block of memory. | |
6197 | 5401 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 5402 return munmap(addr, bytes) == 0; |
5403 } | |
5404 | |
5405 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
5406 | |
5407 static clockid_t thread_cpu_clockid(Thread* thread) { | |
5408 pthread_t tid = thread->osthread()->pthread_id(); | |
5409 clockid_t clockid; | |
5410 | |
5411 // Get thread clockid | |
5412 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
5413 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
5414 return clockid; | |
5415 } | |
5416 | |
5417 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
5418 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
5419 // of a thread. | |
5420 // | |
5421 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
5422 // the fast estimate available on the platform. | |
5423 | |
5424 jlong os::current_thread_cpu_time() { | |
5425 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5426 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5427 } else { | |
5428 // return user + sys since the cost is the same | |
5429 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
5430 } | |
5431 } | |
5432 | |
5433 jlong os::thread_cpu_time(Thread* thread) { | |
5434 // consistent with what current_thread_cpu_time() returns | |
5435 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5436 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5437 } else { | |
5438 return slow_thread_cpu_time(thread, true /* user + sys */); | |
5439 } | |
5440 } | |
5441 | |
5442 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
5443 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5444 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5445 } else { | |
5446 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
5447 } | |
5448 } | |
5449 | |
5450 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5451 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5452 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5453 } else { | |
5454 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
5455 } | |
5456 } | |
5457 | |
5458 // | |
5459 // -1 on error. | |
5460 // | |
5461 | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17848
diff
changeset
|
5462 PRAGMA_DIAG_PUSH |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17848
diff
changeset
|
5463 PRAGMA_FORMAT_NONLITERAL_IGNORED |
0 | 5464 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { |
5465 static bool proc_task_unchecked = true; | |
5466 static const char *proc_stat_path = "/proc/%d/stat"; | |
5467 pid_t tid = thread->osthread()->thread_id(); | |
5468 char *s; | |
5469 char stat[2048]; | |
5470 int statlen; | |
5471 char proc_name[64]; | |
5472 int count; | |
5473 long sys_time, user_time; | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5474 char cdummy; |
0 | 5475 int idummy; |
5476 long ldummy; | |
5477 FILE *fp; | |
5478 | |
5479 // The /proc/<tid>/stat aggregates per-process usage on | |
5480 // new Linux kernels 2.6+ where NPTL is supported. | |
5481 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
5482 // See bug 6328462. | |
8099
4c1d8002ffb1
8004495: [parfait] False positive Buffer overflow in hotspot/src/os/linux/vm/os_linux.cpp
hseigel
parents:
8067
diff
changeset
|
5483 // There possibly can be cases where there is no directory |
4c1d8002ffb1
8004495: [parfait] False positive Buffer overflow in hotspot/src/os/linux/vm/os_linux.cpp
hseigel
parents:
8067
diff
changeset
|
5484 // /proc/self/task, so we check its availability. |
0 | 5485 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
5486 // This is executed only once | |
5487 proc_task_unchecked = false; | |
5488 fp = fopen("/proc/self/task", "r"); | |
5489 if (fp != NULL) { | |
5490 proc_stat_path = "/proc/self/task/%d/stat"; | |
5491 fclose(fp); | |
5492 } | |
5493 } | |
5494 | |
5495 sprintf(proc_name, proc_stat_path, tid); | |
5496 fp = fopen(proc_name, "r"); | |
5497 if ( fp == NULL ) return -1; | |
5498 statlen = fread(stat, 1, 2047, fp); | |
5499 stat[statlen] = '\0'; | |
5500 fclose(fp); | |
5501 | |
5502 // Skip pid and the command string. Note that we could be dealing with | |
5503 // weird command names, e.g. user could decide to rename java launcher | |
5504 // to "java 1.4.2 :)", then the stat file would look like | |
5505 // 1234 (java 1.4.2 :)) R ... ... | |
5506 // We don't really need to know the command string, just find the last | |
5507 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
5508 s = strrchr(stat, ')'); | |
5509 if (s == NULL ) return -1; | |
5510 | |
5511 // Skip blank chars | |
5512 do s++; while (isspace(*s)); | |
5513 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5514 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1642
diff
changeset
|
5515 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 5516 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
5517 &user_time, &sys_time); | |
1681
126ea7725993
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bobv
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1642
diff
changeset
|
5518 if ( count != 13 ) return -1; |
0 | 5519 if (user_sys_cpu_time) { |
5520 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
5521 } else { | |
5522 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
5523 } | |
5524 } | |
17937
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drchase
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17848
diff
changeset
|
5525 PRAGMA_DIAG_POP |
0 | 5526 |
5527 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5528 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5529 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5530 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5531 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5532 } | |
5533 | |
5534 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5535 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5536 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5537 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5538 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5539 } | |
5540 | |
5541 bool os::is_thread_cpu_time_supported() { | |
5542 return true; | |
5543 } | |
5544 | |
5545 // System loadavg support. Returns -1 if load average cannot be obtained. | |
5546 // Linux doesn't yet have a (official) notion of processor sets, | |
5547 // so just return the system wide load average. | |
5548 int os::loadavg(double loadavg[], int nelem) { | |
5549 return ::getloadavg(loadavg, nelem); | |
5550 } | |
5551 | |
5552 void os::pause() { | |
5553 char filename[MAX_PATH]; | |
5554 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
5555 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
5556 } else { | |
5557 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
5558 } | |
5559 | |
5560 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
5561 if (fd != -1) { | |
5562 struct stat buf; | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5563 ::close(fd); |
0 | 5564 while (::stat(filename, &buf) == 0) { |
5565 (void)::poll(NULL, 0, 100); | |
5566 } | |
5567 } else { | |
5568 jio_fprintf(stderr, | |
5569 "Could not open pause file '%s', continuing immediately.\n", filename); | |
5570 } | |
5571 } | |
5572 | |
5573 | |
5574 // Refer to the comments in os_solaris.cpp park-unpark. | |
5575 // | |
5576 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
5577 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
5578 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
5579 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
5580 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
5581 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
5582 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
5583 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
5584 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
5585 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
5586 // of libpthread avoids the problem, but isn't practical. | |
5587 // | |
5588 // Possible remedies: | |
5589 // | |
5590 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
5591 // This is palliative and probabilistic, however. If the thread is preempted | |
5592 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
5593 // than the minimum period may have passed, and the abstime may be stale (in the | |
5594 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
5595 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
5596 // | |
5597 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
5598 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
5599 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
5600 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
5601 // thread. | |
5602 // | |
5603 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
5604 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
5605 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
5606 // This also works well. In fact it avoids kernel-level scalability impediments | |
5607 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
5608 // timers in a graceful fashion. | |
5609 // | |
5610 // 4. When the abstime value is in the past it appears that control returns | |
5611 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5612 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5613 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5614 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5615 // It may be possible to avoid reinitialization by checking the return | |
5616 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5617 // condvar we must establish the invariant that cond_signal() is only called | |
5618 // within critical sections protected by the adjunct mutex. This prevents | |
5619 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5620 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5621 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5622 // | |
5623 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5624 // structure when a condvar is used or initialized. cond_destroy() would | |
5625 // release the helper structure. Our reinitialize-after-timedwait fix | |
5626 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5627 // | |
5628 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5629 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5630 // and only enabling the work-around for vulnerable environments. | |
5631 | |
5632 // utility to compute the abstime argument to timedwait: | |
5633 // millis is the relative timeout time | |
5634 // abstime will be the absolute timeout time | |
5635 // TODO: replace compute_abstime() with unpackTime() | |
5636 | |
5637 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5638 if (millis < 0) millis = 0; | |
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5639 |
0 | 5640 jlong seconds = millis / 1000; |
5641 millis %= 1000; | |
5642 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5643 seconds = 50000000; | |
5644 } | |
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5645 |
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5646 if (os::Linux::supports_monotonic_clock()) { |
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5647 struct timespec now; |
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5648 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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5649 assert_status(status == 0, status, "clock_gettime"); |
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5650 abstime->tv_sec = now.tv_sec + seconds; |
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5651 long nanos = now.tv_nsec + millis * NANOSECS_PER_MILLISEC; |
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5652 if (nanos >= NANOSECS_PER_SEC) { |
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5653 abstime->tv_sec += 1; |
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5654 nanos -= NANOSECS_PER_SEC; |
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5655 } |
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5656 abstime->tv_nsec = nanos; |
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5657 } else { |
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5658 struct timeval now; |
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5659 int status = gettimeofday(&now, NULL); |
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5660 assert(status == 0, "gettimeofday"); |
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5661 abstime->tv_sec = now.tv_sec + seconds; |
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5662 long usec = now.tv_usec + millis * 1000; |
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5663 if (usec >= 1000000) { |
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5664 abstime->tv_sec += 1; |
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5665 usec -= 1000000; |
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5666 } |
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5667 abstime->tv_nsec = usec * 1000; |
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5668 } |
0 | 5669 return abstime; |
5670 } | |
5671 | |
5672 | |
5673 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5674 // Conceptually TryPark() should be equivalent to park(0). | |
5675 | |
5676 int os::PlatformEvent::TryPark() { | |
5677 for (;;) { | |
5678 const int v = _Event ; | |
5679 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5680 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5681 } | |
5682 } | |
5683 | |
5684 void os::PlatformEvent::park() { // AKA "down()" | |
5685 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5686 // may call park(). | |
5687 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5688 int v ; | |
5689 for (;;) { | |
5690 v = _Event ; | |
5691 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5692 } | |
5693 guarantee (v >= 0, "invariant") ; | |
5694 if (v == 0) { | |
5695 // Do this the hard way by blocking ... | |
5696 int status = pthread_mutex_lock(_mutex); | |
5697 assert_status(status == 0, status, "mutex_lock"); | |
5698 guarantee (_nParked == 0, "invariant") ; | |
5699 ++ _nParked ; | |
5700 while (_Event < 0) { | |
5701 status = pthread_cond_wait(_cond, _mutex); | |
5702 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5703 // Treat this the same as if the wait was interrupted | |
5704 if (status == ETIME) { status = EINTR; } | |
5705 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5706 } | |
5707 -- _nParked ; | |
5708 | |
5709 _Event = 0 ; | |
5710 status = pthread_mutex_unlock(_mutex); | |
5711 assert_status(status == 0, status, "mutex_unlock"); | |
7629
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5712 // Paranoia to ensure our locked and lock-free paths interact |
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5713 // correctly with each other. |
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5714 OrderAccess::fence(); |
0 | 5715 } |
5716 guarantee (_Event >= 0, "invariant") ; | |
5717 } | |
5718 | |
5719 int os::PlatformEvent::park(jlong millis) { | |
5720 guarantee (_nParked == 0, "invariant") ; | |
5721 | |
5722 int v ; | |
5723 for (;;) { | |
5724 v = _Event ; | |
5725 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5726 } | |
5727 guarantee (v >= 0, "invariant") ; | |
5728 if (v != 0) return OS_OK ; | |
5729 | |
5730 // We do this the hard way, by blocking the thread. | |
5731 // Consider enforcing a minimum timeout value. | |
5732 struct timespec abst; | |
5733 compute_abstime(&abst, millis); | |
5734 | |
5735 int ret = OS_TIMEOUT; | |
5736 int status = pthread_mutex_lock(_mutex); | |
5737 assert_status(status == 0, status, "mutex_lock"); | |
5738 guarantee (_nParked == 0, "invariant") ; | |
5739 ++_nParked ; | |
5740 | |
5741 // Object.wait(timo) will return because of | |
5742 // (a) notification | |
5743 // (b) timeout | |
5744 // (c) thread.interrupt | |
5745 // | |
5746 // Thread.interrupt and object.notify{All} both call Event::set. | |
5747 // That is, we treat thread.interrupt as a special case of notification. | |
5748 // The underlying Solaris implementation, cond_timedwait, admits | |
5749 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5750 // JVM from making those visible to Java code. As such, we must | |
5751 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5752 // | |
5753 // TODO: properly differentiate simultaneous notify+interrupt. | |
5754 // In that case, we should propagate the notify to another waiter. | |
5755 | |
5756 while (_Event < 0) { | |
5757 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5758 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5759 pthread_cond_destroy (_cond); | |
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5760 pthread_cond_init (_cond, os::Linux::condAttr()) ; |
0 | 5761 } |
5762 assert_status(status == 0 || status == EINTR || | |
5763 status == ETIME || status == ETIMEDOUT, | |
5764 status, "cond_timedwait"); | |
5765 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5766 if (status == ETIME || status == ETIMEDOUT) break ; | |
5767 // We consume and ignore EINTR and spurious wakeups. | |
5768 } | |
5769 --_nParked ; | |
5770 if (_Event >= 0) { | |
5771 ret = OS_OK; | |
5772 } | |
5773 _Event = 0 ; | |
5774 status = pthread_mutex_unlock(_mutex); | |
5775 assert_status(status == 0, status, "mutex_unlock"); | |
5776 assert (_nParked == 0, "invariant") ; | |
7629
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5777 // Paranoia to ensure our locked and lock-free paths interact |
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5778 // correctly with each other. |
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5779 OrderAccess::fence(); |
0 | 5780 return ret; |
5781 } | |
5782 | |
5783 void os::PlatformEvent::unpark() { | |
7629
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5784 // Transitions for _Event: |
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5785 // 0 :=> 1 |
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5786 // 1 :=> 1 |
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5787 // -1 :=> either 0 or 1; must signal target thread |
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5788 // That is, we can safely transition _Event from -1 to either |
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5789 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5790 // unpark() calls. |
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5791 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5792 // |
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5793 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5794 // that it will take two back-to-back park() calls for the owning |
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5795 // thread to block. This has the benefit of forcing a spurious return |
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5796 // from the first park() call after an unpark() call which will help |
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5797 // shake out uses of park() and unpark() without condition variables. |
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5798 |
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5799 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5800 |
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5801 // Wait for the thread associated with the event to vacate |
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5802 int status = pthread_mutex_lock(_mutex); |
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5803 assert_status(status == 0, status, "mutex_lock"); |
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5804 int AnyWaiters = _nParked; |
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5805 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5806 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5807 AnyWaiters = 0; |
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5808 pthread_cond_signal(_cond); |
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5809 } |
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5810 status = pthread_mutex_unlock(_mutex); |
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5811 assert_status(status == 0, status, "mutex_unlock"); |
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5812 if (AnyWaiters != 0) { |
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5813 status = pthread_cond_signal(_cond); |
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5814 assert_status(status == 0, status, "cond_signal"); |
0 | 5815 } |
5816 | |
5817 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5818 // This is safe and avoids a common class of futile wakeups. In rare | |
5819 // circumstances this can cause a thread to return prematurely from | |
5820 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5821 // simply re-test the condition and re-park itself. | |
5822 } | |
5823 | |
5824 | |
5825 // JSR166 | |
5826 // ------------------------------------------------------- | |
5827 | |
5828 /* | |
5829 * The solaris and linux implementations of park/unpark are fairly | |
5830 * conservative for now, but can be improved. They currently use a | |
5831 * mutex/condvar pair, plus a a count. | |
5832 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5833 * sets count to 1 and signals condvar. Only one thread ever waits | |
5834 * on the condvar. Contention seen when trying to park implies that someone | |
5835 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5836 * is no need to track notifications. | |
5837 */ | |
5838 | |
5839 /* | |
5840 * This code is common to linux and solaris and will be moved to a | |
5841 * common place in dolphin. | |
5842 * | |
5843 * The passed in time value is either a relative time in nanoseconds | |
5844 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5845 * into suitable seconds and nanoseconds components and stored in the | |
5846 * given timespec structure. | |
5847 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5848 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5849 * overflow if times way in the future are given. Further on Solaris versions | |
5850 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5851 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5852 * As it will be 28 years before "now + 100000000" will overflow we can | |
5853 * ignore overflow and just impose a hard-limit on seconds using the value | |
5854 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5855 * years from "now". | |
5856 */ | |
5857 | |
5858 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5859 assert (time > 0, "convertTime"); | |
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5860 time_t max_secs = 0; |
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5861 |
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5862 if (!os::Linux::supports_monotonic_clock() || isAbsolute) { |
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5863 struct timeval now; |
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5864 int status = gettimeofday(&now, NULL); |
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5865 assert(status == 0, "gettimeofday"); |
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5866 |
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5867 max_secs = now.tv_sec + MAX_SECS; |
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|
5868 |
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|
5869 if (isAbsolute) { |
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|
5870 jlong secs = time / 1000; |
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|
5871 if (secs > max_secs) { |
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|
5872 absTime->tv_sec = max_secs; |
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|
5873 } else { |
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|
5874 absTime->tv_sec = secs; |
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|
5875 } |
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|
5876 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; |
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|
5877 } else { |
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|
5878 jlong secs = time / NANOSECS_PER_SEC; |
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|
5879 if (secs >= MAX_SECS) { |
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|
5880 absTime->tv_sec = max_secs; |
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|
5881 absTime->tv_nsec = 0; |
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|
5882 } else { |
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|
5883 absTime->tv_sec = now.tv_sec + secs; |
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|
5884 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; |
2e6938dd68f2
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|
5885 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
2e6938dd68f2
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|
5886 absTime->tv_nsec -= NANOSECS_PER_SEC; |
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|
5887 ++absTime->tv_sec; // note: this must be <= max_secs |
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|
5888 } |
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|
5889 } |
0 | 5890 } |
12211
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|
5891 } else { |
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|
5892 // must be relative using monotonic clock |
2e6938dd68f2
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changeset
|
5893 struct timespec now; |
2e6938dd68f2
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changeset
|
5894 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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|
5895 assert_status(status == 0, status, "clock_gettime"); |
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|
5896 max_secs = now.tv_sec + MAX_SECS; |
0 | 5897 jlong secs = time / NANOSECS_PER_SEC; |
5898 if (secs >= MAX_SECS) { | |
5899 absTime->tv_sec = max_secs; | |
5900 absTime->tv_nsec = 0; | |
12211
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|
5901 } else { |
0 | 5902 absTime->tv_sec = now.tv_sec + secs; |
12211
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|
5903 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_nsec; |
0 | 5904 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
5905 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5906 ++absTime->tv_sec; // note: this must be <= max_secs | |
5907 } | |
5908 } | |
5909 } | |
5910 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5911 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5912 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5913 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5914 } | |
5915 | |
5916 void Parker::park(bool isAbsolute, jlong time) { | |
7629
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diff
changeset
|
5917 // Ideally we'd do something useful while spinning, such |
22ba8c8ce6a6
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diff
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|
5918 // as calling unpackTime(). |
22ba8c8ce6a6
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diff
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|
5919 |
0 | 5920 // Optional fast-path check: |
5921 // Return immediately if a permit is available. | |
7629
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diff
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|
5922 // We depend on Atomic::xchg() having full barrier semantics |
22ba8c8ce6a6
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diff
changeset
|
5923 // since we are doing a lock-free update to _counter. |
22ba8c8ce6a6
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diff
changeset
|
5924 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5925 |
5926 Thread* thread = Thread::current(); | |
5927 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5928 JavaThread *jt = (JavaThread *)thread; | |
5929 | |
5930 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5931 // Check interrupt before trying to wait | |
5932 if (Thread::is_interrupted(thread, false)) { | |
5933 return; | |
5934 } | |
5935 | |
5936 // Next, demultiplex/decode time arguments | |
5937 timespec absTime; | |
1865
1c352af0135d
6763959: java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
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parents:
1750
diff
changeset
|
5938 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5939 return; |
5940 } | |
5941 if (time > 0) { | |
5942 unpackTime(&absTime, isAbsolute, time); | |
5943 } | |
5944 | |
5945 | |
5946 // Enter safepoint region | |
5947 // Beware of deadlocks such as 6317397. | |
5948 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5949 // In particular a thread must never block on the Threads_lock while | |
5950 // holding the Parker:: mutex. If safepoints are pending both the | |
5951 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5952 ThreadBlockInVM tbivm(jt); | |
5953 | |
5954 // Don't wait if cannot get lock since interference arises from | |
5955 // unblocking. Also. check interrupt before trying wait | |
5956 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5957 return; | |
5958 } | |
5959 | |
5960 int status ; | |
5961 if (_counter > 0) { // no wait needed | |
5962 _counter = 0; | |
5963 status = pthread_mutex_unlock(_mutex); | |
5964 assert (status == 0, "invariant") ; | |
7629
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|
5965 // Paranoia to ensure our locked and lock-free paths interact |
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diff
changeset
|
5966 // correctly with each other and Java-level accesses. |
1117
95e9083cf4a7
6822370: ReentrantReadWriteLock: threads hung when there are no threads holding onto the lock (Netra x4450)
dholmes
parents:
1010
diff
changeset
|
5967 OrderAccess::fence(); |
0 | 5968 return; |
5969 } | |
5970 | |
5971 #ifdef ASSERT | |
5972 // Don't catch signals while blocked; let the running threads have the signals. | |
5973 // (This allows a debugger to break into the running thread.) | |
5974 sigset_t oldsigs; | |
5975 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5976 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5977 #endif | |
5978 | |
5979 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5980 jt->set_suspend_equivalent(); | |
5981 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5982 | |
12211
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|
5983 assert(_cur_index == -1, "invariant"); |
0 | 5984 if (time == 0) { |
12211
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|
5985 _cur_index = REL_INDEX; // arbitrary choice when not timed |
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|
5986 status = pthread_cond_wait (&_cond[_cur_index], _mutex) ; |
0 | 5987 } else { |
12211
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|
5988 _cur_index = isAbsolute ? ABS_INDEX : REL_INDEX; |
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|
5989 status = os::Linux::safe_cond_timedwait (&_cond[_cur_index], _mutex, &absTime) ; |
0 | 5990 if (status != 0 && WorkAroundNPTLTimedWaitHang) { |
12211
2e6938dd68f2
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|
5991 pthread_cond_destroy (&_cond[_cur_index]) ; |
2e6938dd68f2
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changeset
|
5992 pthread_cond_init (&_cond[_cur_index], isAbsolute ? NULL : os::Linux::condAttr()); |
0 | 5993 } |
5994 } | |
12211
2e6938dd68f2
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12182
diff
changeset
|
5995 _cur_index = -1; |
0 | 5996 assert_status(status == 0 || status == EINTR || |
5997 status == ETIME || status == ETIMEDOUT, | |
5998 status, "cond_timedwait"); | |
5999 | |
6000 #ifdef ASSERT | |
6001 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
6002 #endif | |
6003 | |
6004 _counter = 0 ; | |
6005 status = pthread_mutex_unlock(_mutex) ; | |
6006 assert_status(status == 0, status, "invariant") ; | |
7629
22ba8c8ce6a6
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parents:
7456
diff
changeset
|
6007 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
6008 // correctly with each other and Java-level accesses. |
22ba8c8ce6a6
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dcubed
parents:
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diff
changeset
|
6009 OrderAccess::fence(); |
22ba8c8ce6a6
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parents:
7456
diff
changeset
|
6010 |
0 | 6011 // If externally suspended while waiting, re-suspend |
6012 if (jt->handle_special_suspend_equivalent_condition()) { | |
6013 jt->java_suspend_self(); | |
6014 } | |
6015 } | |
6016 | |
6017 void Parker::unpark() { | |
6018 int s, status ; | |
6019 status = pthread_mutex_lock(_mutex); | |
6020 assert (status == 0, "invariant") ; | |
6021 s = _counter; | |
6022 _counter = 1; | |
6023 if (s < 1) { | |
12211
2e6938dd68f2
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|
6024 // thread might be parked |
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diff
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|
6025 if (_cur_index != -1) { |
2e6938dd68f2
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diff
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|
6026 // thread is definitely parked |
2e6938dd68f2
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|
6027 if (WorkAroundNPTLTimedWaitHang) { |
2e6938dd68f2
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diff
changeset
|
6028 status = pthread_cond_signal (&_cond[_cur_index]); |
2e6938dd68f2
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12182
diff
changeset
|
6029 assert (status == 0, "invariant"); |
0 | 6030 status = pthread_mutex_unlock(_mutex); |
12211
2e6938dd68f2
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12182
diff
changeset
|
6031 assert (status == 0, "invariant"); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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diff
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|
6032 } else { |
23418
54203a323126
8029453: java/util/concurrent/locks/ReentrantLock/TimeoutLockLoops.java failed by timeout
dholmes
parents:
23020
diff
changeset
|
6033 // must capture correct index before unlocking |
54203a323126
8029453: java/util/concurrent/locks/ReentrantLock/TimeoutLockLoops.java failed by timeout
dholmes
parents:
23020
diff
changeset
|
6034 int index = _cur_index; |
0 | 6035 status = pthread_mutex_unlock(_mutex); |
12211
2e6938dd68f2
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12182
diff
changeset
|
6036 assert (status == 0, "invariant"); |
23418
54203a323126
8029453: java/util/concurrent/locks/ReentrantLock/TimeoutLockLoops.java failed by timeout
dholmes
parents:
23020
diff
changeset
|
6037 status = pthread_cond_signal (&_cond[index]); |
12211
2e6938dd68f2
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12182
diff
changeset
|
6038 assert (status == 0, "invariant"); |
2e6938dd68f2
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diff
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|
6039 } |
2e6938dd68f2
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diff
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|
6040 } else { |
2e6938dd68f2
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changeset
|
6041 pthread_mutex_unlock(_mutex); |
2e6938dd68f2
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12182
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changeset
|
6042 assert (status == 0, "invariant") ; |
2e6938dd68f2
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|
6043 } |
0 | 6044 } else { |
6045 pthread_mutex_unlock(_mutex); | |
6046 assert (status == 0, "invariant") ; | |
6047 } | |
6048 } | |
6049 | |
6050 | |
6051 extern char** environ; | |
6052 | |
6053 // Run the specified command in a separate process. Return its exit value, | |
6054 // or -1 on failure (e.g. can't fork a new process). | |
6055 // Unlike system(), this function can be called from signal handler. It | |
6056 // doesn't block SIGINT et al. | |
6057 int os::fork_and_exec(char* cmd) { | |
199
f139919897d2
6681796: hotspot build failure on gcc 4.2.x (ubuntu 8.04) w/ openjdk 6
xlu
parents:
141
diff
changeset
|
6058 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 6059 |
22989
915ca3e9d15e
8078470: [Linux] Replace syscall use in os::fork_and_exec with glibc fork() and execve()
dholmes
parents:
22883
diff
changeset
|
6060 pid_t pid = fork(); |
0 | 6061 |
6062 if (pid < 0) { | |
6063 // fork failed | |
6064 return -1; | |
6065 | |
6066 } else if (pid == 0) { | |
6067 // child process | |
6068 | |
22989
915ca3e9d15e
8078470: [Linux] Replace syscall use in os::fork_and_exec with glibc fork() and execve()
dholmes
parents:
22883
diff
changeset
|
6069 execve("/bin/sh", (char* const*)argv, environ); |
0 | 6070 |
6071 // execve failed | |
6072 _exit(-1); | |
6073 | |
6074 } else { | |
6075 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
6076 // care about the actual exit code, for now. | |
6077 | |
6078 int status; | |
6079 | |
6080 // Wait for the child process to exit. This returns immediately if | |
6081 // the child has already exited. */ | |
6082 while (waitpid(pid, &status, 0) < 0) { | |
6083 switch (errno) { | |
6084 case ECHILD: return 0; | |
6085 case EINTR: break; | |
6086 default: return -1; | |
6087 } | |
6088 } | |
6089 | |
6090 if (WIFEXITED(status)) { | |
6091 // The child exited normally; get its exit code. | |
6092 return WEXITSTATUS(status); | |
6093 } else if (WIFSIGNALED(status)) { | |
6094 // The child exited because of a signal | |
6095 // The best value to return is 0x80 + signal number, | |
6096 // because that is what all Unix shells do, and because | |
6097 // it allows callers to distinguish between process exit and | |
6098 // process death by signal. | |
6099 return 0x80 + WTERMSIG(status); | |
6100 } else { | |
6101 // Unknown exit code; pass it through | |
6102 return status; | |
6103 } | |
6104 } | |
6105 } | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6106 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6107 // is_headless_jre() |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6108 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6109 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6110 // in order to report if we are running in a headless jre |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6111 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6112 // Since JDK8 xawt/libmawt.so was moved into the same directory |
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6113 // as libawt.so, and renamed libawt_xawt.so |
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6114 // |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6115 bool os::is_headless_jre() { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6116 struct stat statbuf; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6117 char buf[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6118 char libmawtpath[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6119 const char *xawtstr = "/xawt/libmawt.so"; |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6120 const char *new_xawtstr = "/libawt_xawt.so"; |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6121 char *p; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6122 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6123 // Get path to libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6124 os::jvm_path(buf, sizeof(buf)); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6125 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6126 // Get rid of libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6127 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6128 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6129 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6130 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6131 // Get rid of client or server |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6132 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6133 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6134 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6135 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6136 // check xawt/libmawt.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6137 strcpy(libmawtpath, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6138 strcat(libmawtpath, xawtstr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6139 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6140 |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6141 // check libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6142 strcpy(libmawtpath, buf); |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6143 strcat(libmawtpath, new_xawtstr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
6144 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6145 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6146 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6147 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6148 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6149 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6150 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6151 int os::get_core_path(char* buffer, size_t bufferSize) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6152 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6153 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6154 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6155 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6156 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6157 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6158 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6159 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6160 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6161 |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6162 /////////////// Unit tests /////////////// |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6163 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6164 #ifndef PRODUCT |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6165 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6166 #define test_log(...) \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6167 do {\ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6168 if (VerboseInternalVMTests) { \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6169 tty->print_cr(__VA_ARGS__); \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6170 tty->flush(); \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6171 }\ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6172 } while (false) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6173 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6174 class TestReserveMemorySpecial : AllStatic { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6175 public: |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6176 static void small_page_write(void* addr, size_t size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6177 size_t page_size = os::vm_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6178 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6179 char* end = (char*)addr + size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6180 for (char* p = (char*)addr; p < end; p += page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6181 *p = 1; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6182 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6183 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6184 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6185 static void test_reserve_memory_special_huge_tlbfs_only(size_t size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6186 if (!UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6187 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6188 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6189 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6190 test_log("test_reserve_memory_special_huge_tlbfs_only(" SIZE_FORMAT ")", size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6191 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6192 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_only(size, NULL, false); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6193 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6194 if (addr != NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6195 small_page_write(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6196 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6197 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6198 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6199 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6200 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6201 static void test_reserve_memory_special_huge_tlbfs_only() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6202 if (!UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6203 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6204 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6205 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6206 size_t lp = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6207 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6208 for (size_t size = lp; size <= lp * 10; size += lp) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6209 test_reserve_memory_special_huge_tlbfs_only(size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6210 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6211 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6212 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6213 static void test_reserve_memory_special_huge_tlbfs_mixed() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6214 size_t lp = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6215 size_t ag = os::vm_allocation_granularity(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6216 |
24006
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6217 // sizes to test |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6218 const size_t sizes[] = { |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6219 lp, lp + ag, lp + lp / 2, lp * 2, |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6220 lp * 2 + ag, lp * 2 - ag, lp * 2 + lp / 2, |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6221 lp * 10, lp * 10 + lp / 2 |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6222 }; |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6223 const int num_sizes = sizeof(sizes) / sizeof(size_t); |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6224 |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6225 // For each size/alignment combination, we test three scenarios: |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6226 // 1) with req_addr == NULL |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6227 // 2) with a non-null req_addr at which we expect to successfully allocate |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6228 // 3) with a non-null req_addr which contains a pre-existing mapping, at which we |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6229 // expect the allocation to either fail or to ignore req_addr |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6230 |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6231 // Pre-allocate two areas; they shall be as large as the largest allocation |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6232 // and aligned to the largest alignment we will be testing. |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6233 const size_t mapping_size = sizes[num_sizes - 1] * 2; |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6234 char* const mapping1 = (char*) ::mmap(NULL, mapping_size, |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
parents:
23822
diff
changeset
|
6235 PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, |
44c8fe602a5e
8077276: allocating heap with UseLargePages and HugeTLBFS may trash existing memory mappings (linux)
stuefe
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6236 -1, 0); |
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6237 assert(mapping1 != MAP_FAILED, "should work"); |
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|
6238 |
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6239 char* const mapping2 = (char*) ::mmap(NULL, mapping_size, |
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6240 PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, |
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6241 -1, 0); |
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|
6242 assert(mapping2 != MAP_FAILED, "should work"); |
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|
6243 |
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6244 // Unmap the first mapping, but leave the second mapping intact: the first |
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6245 // mapping will serve as a value for a "good" req_addr (case 2). The second |
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6246 // mapping, still intact, as "bad" req_addr (case 3). |
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6247 ::munmap(mapping1, mapping_size); |
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|
6248 |
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|
6249 // Case 1 |
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|
6250 test_log("%s, req_addr NULL:", __FUNCTION__); |
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|
6251 test_log("size align result"); |
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6252 |
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|
6253 for (int i = 0; i < num_sizes; i++) { |
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|
6254 const size_t size = sizes[i]; |
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6255 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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|
6256 char* p = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, NULL, false); |
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|
6257 test_log(SIZE_FORMAT_HEX " " SIZE_FORMAT_HEX " -> " PTR_FORMAT " %s", |
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|
6258 size, alignment, p, (p != NULL ? "" : "(failed)")); |
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|
6259 if (p != NULL) { |
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|
6260 assert(is_ptr_aligned(p, alignment), "must be"); |
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|
6261 small_page_write(p, size); |
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|
6262 os::Linux::release_memory_special_huge_tlbfs(p, size); |
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|
6263 } |
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|
6264 } |
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|
6265 } |
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|
6266 |
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|
6267 // Case 2 |
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|
6268 test_log("%s, req_addr non-NULL:", __FUNCTION__); |
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|
6269 test_log("size align req_addr result"); |
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|
6270 |
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|
6271 for (int i = 0; i < num_sizes; i++) { |
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|
6272 const size_t size = sizes[i]; |
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|
6273 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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|
6274 char* const req_addr = (char*) align_ptr_up(mapping1, alignment); |
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|
6275 char* p = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, req_addr, false); |
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|
6276 test_log(SIZE_FORMAT_HEX " " SIZE_FORMAT_HEX " " PTR_FORMAT " -> " PTR_FORMAT " %s", |
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|
6277 size, alignment, req_addr, p, |
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|
6278 ((p != NULL ? (p == req_addr ? "(exact match)" : "") : "(failed)"))); |
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|
6279 if (p != NULL) { |
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|
6280 assert(p == req_addr, "must be"); |
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|
6281 small_page_write(p, size); |
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|
6282 os::Linux::release_memory_special_huge_tlbfs(p, size); |
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|
6283 } |
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|
6284 } |
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|
6285 } |
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|
6286 |
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|
6287 // Case 3 |
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|
6288 test_log("%s, req_addr non-NULL with preexisting mapping:", __FUNCTION__); |
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|
6289 test_log("size align req_addr result"); |
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|
6290 |
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changeset
|
6291 for (int i = 0; i < num_sizes; i++) { |
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|
6292 const size_t size = sizes[i]; |
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|
6293 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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|
6294 char* const req_addr = (char*) align_ptr_up(mapping2, alignment); |
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|
6295 char* p = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, req_addr, false); |
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|
6296 test_log(SIZE_FORMAT_HEX " " SIZE_FORMAT_HEX " " PTR_FORMAT " -> " PTR_FORMAT " %s", |
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|
6297 size, alignment, req_addr, p, |
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|
6298 ((p != NULL ? "" : "(failed)"))); |
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|
6299 // as the area around req_addr contains already existing mappings, the API should always |
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|
6300 // return NULL (as per contract, it cannot return another address) |
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|
6301 assert(p == NULL, "must be"); |
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|
6302 } |
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|
6303 } |
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|
6304 |
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changeset
|
6305 ::munmap(mapping2, mapping_size); |
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|
6306 |
12110
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|
6307 } |
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changeset
|
6308 |
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changeset
|
6309 static void test_reserve_memory_special_huge_tlbfs() { |
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|
6310 if (!UseHugeTLBFS) { |
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|
6311 return; |
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|
6312 } |
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changeset
|
6313 |
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|
6314 test_reserve_memory_special_huge_tlbfs_only(); |
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|
6315 test_reserve_memory_special_huge_tlbfs_mixed(); |
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|
6316 } |
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changeset
|
6317 |
4c84d351cca9
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changeset
|
6318 static void test_reserve_memory_special_shm(size_t size, size_t alignment) { |
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|
6319 if (!UseSHM) { |
4c84d351cca9
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changeset
|
6320 return; |
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changeset
|
6321 } |
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changeset
|
6322 |
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changeset
|
6323 test_log("test_reserve_memory_special_shm(" SIZE_FORMAT ", " SIZE_FORMAT ")", size, alignment); |
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changeset
|
6324 |
4c84d351cca9
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changeset
|
6325 char* addr = os::Linux::reserve_memory_special_shm(size, alignment, NULL, false); |
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changeset
|
6326 |
4c84d351cca9
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changeset
|
6327 if (addr != NULL) { |
4c84d351cca9
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changeset
|
6328 assert(is_ptr_aligned(addr, alignment), "Check"); |
4c84d351cca9
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changeset
|
6329 assert(is_ptr_aligned(addr, os::large_page_size()), "Check"); |
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changeset
|
6330 |
4c84d351cca9
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changeset
|
6331 small_page_write(addr, size); |
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changeset
|
6332 |
4c84d351cca9
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changeset
|
6333 os::Linux::release_memory_special_shm(addr, size); |
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changeset
|
6334 } |
4c84d351cca9
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diff
changeset
|
6335 } |
4c84d351cca9
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changeset
|
6336 |
4c84d351cca9
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changeset
|
6337 static void test_reserve_memory_special_shm() { |
4c84d351cca9
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changeset
|
6338 size_t lp = os::large_page_size(); |
4c84d351cca9
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changeset
|
6339 size_t ag = os::vm_allocation_granularity(); |
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changeset
|
6340 |
4c84d351cca9
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changeset
|
6341 for (size_t size = ag; size < lp * 3; size += ag) { |
4c84d351cca9
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changeset
|
6342 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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changeset
|
6343 test_reserve_memory_special_shm(size, alignment); |
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changeset
|
6344 } |
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changeset
|
6345 } |
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changeset
|
6346 } |
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changeset
|
6347 |
4c84d351cca9
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changeset
|
6348 static void test() { |
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6349 test_reserve_memory_special_huge_tlbfs(); |
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6350 test_reserve_memory_special_shm(); |
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6351 } |
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6352 }; |
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6353 |
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6354 void TestReserveMemorySpecial_test() { |
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6355 TestReserveMemorySpecial::test(); |
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6356 } |
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6357 |
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6358 #endif |