Mercurial > hg > truffle
annotate src/os/linux/vm/os_linux.cpp @ 20590:c47fcf523fff
8042428: CompileQueue::free_all() code is incorrect
Summary: Free task after getting next pointer of freelist.
Reviewed-by: kvn, adlertz
author | anoll |
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date | Tue, 06 May 2014 09:52:38 +0200 |
parents | 6e0cb14ce59b |
children | 7848fc12602b |
rev | line source |
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0 | 1 /* |
17765 | 2 * Copyright (c) 1999, 2014, 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 | |
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163 #ifdef JAVASE_EMBEDDED |
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164 class MemNotifyThread: public Thread { |
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165 friend class VMStructs; |
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166 public: |
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167 virtual void run(); |
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168 |
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169 private: |
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170 static MemNotifyThread* _memnotify_thread; |
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171 int _fd; |
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172 |
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173 public: |
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174 |
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175 // Constructor |
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176 MemNotifyThread(int fd); |
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177 |
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178 // Tester |
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179 bool is_memnotify_thread() const { return true; } |
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180 |
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181 // Printing |
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182 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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183 |
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184 // Returns the single instance of the MemNotifyThread |
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185 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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186 |
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187 // Create and start the single instance of MemNotifyThread |
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188 static void start(); |
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189 }; |
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190 #endif // JAVASE_EMBEDDED |
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191 |
0 | 192 // utility functions |
193 | |
194 static int SR_initialize(); | |
195 | |
196 julong os::available_memory() { | |
197 return Linux::available_memory(); | |
198 } | |
199 | |
200 julong os::Linux::available_memory() { | |
201 // values in struct sysinfo are "unsigned long" | |
202 struct sysinfo si; | |
203 sysinfo(&si); | |
204 | |
205 return (julong)si.freeram * si.mem_unit; | |
206 } | |
207 | |
208 julong os::physical_memory() { | |
209 return Linux::physical_memory(); | |
210 } | |
211 | |
212 //////////////////////////////////////////////////////////////////////////////// | |
213 // environment support | |
214 | |
215 bool os::getenv(const char* name, char* buf, int len) { | |
216 const char* val = ::getenv(name); | |
217 if (val != NULL && strlen(val) < (size_t)len) { | |
218 strcpy(buf, val); | |
219 return true; | |
220 } | |
221 if (len > 0) buf[0] = 0; // return a null string | |
222 return false; | |
223 } | |
224 | |
225 | |
226 // Return true if user is running as root. | |
227 | |
228 bool os::have_special_privileges() { | |
229 static bool init = false; | |
230 static bool privileges = false; | |
231 if (!init) { | |
232 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
233 init = true; | |
234 } | |
235 return privileges; | |
236 } | |
237 | |
238 | |
239 #ifndef SYS_gettid | |
240 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
241 #ifdef __ia64__ | |
242 #define SYS_gettid 1105 | |
243 #elif __i386__ | |
244 #define SYS_gettid 224 | |
245 #elif __amd64__ | |
246 #define SYS_gettid 186 | |
247 #elif __sparc__ | |
248 #define SYS_gettid 143 | |
249 #else | |
250 #error define gettid for the arch | |
251 #endif | |
252 #endif | |
253 | |
254 // Cpu architecture string | |
1010 | 255 #if defined(ZERO) |
256 static char cpu_arch[] = ZERO_LIBARCH; | |
257 #elif defined(IA64) | |
0 | 258 static char cpu_arch[] = "ia64"; |
259 #elif defined(IA32) | |
260 static char cpu_arch[] = "i386"; | |
261 #elif defined(AMD64) | |
262 static char cpu_arch[] = "amd64"; | |
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263 #elif defined(ARM) |
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264 static char cpu_arch[] = "arm"; |
14390 | 265 #elif defined(PPC32) |
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266 static char cpu_arch[] = "ppc"; |
14391 | 267 #elif defined(PPC64) |
268 static char cpu_arch[] = "ppc64"; | |
0 | 269 #elif defined(SPARC) |
270 # ifdef _LP64 | |
271 static char cpu_arch[] = "sparcv9"; | |
272 # else | |
273 static char cpu_arch[] = "sparc"; | |
274 # endif | |
275 #else | |
276 #error Add appropriate cpu_arch setting | |
277 #endif | |
278 | |
279 | |
280 // pid_t gettid() | |
281 // | |
282 // Returns the kernel thread id of the currently running thread. Kernel | |
283 // thread id is used to access /proc. | |
284 // | |
285 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
286 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
287 // | |
288 pid_t os::Linux::gettid() { | |
289 int rslt = syscall(SYS_gettid); | |
290 if (rslt == -1) { | |
291 // old kernel, no NPTL support | |
292 return getpid(); | |
293 } else { | |
294 return (pid_t)rslt; | |
295 } | |
296 } | |
297 | |
298 // Most versions of linux have a bug where the number of processors are | |
299 // determined by looking at the /proc file system. In a chroot environment, | |
300 // the system call returns 1. This causes the VM to act as if it is | |
301 // a single processor and elide locking (see is_MP() call). | |
302 static bool unsafe_chroot_detected = false; | |
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303 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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304 "Java may be unstable running multithreaded in a chroot " |
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305 "environment on Linux when /proc filesystem is not mounted."; |
0 | 306 |
307 void os::Linux::initialize_system_info() { | |
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308 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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309 if (processor_count() == 1) { |
0 | 310 pid_t pid = os::Linux::gettid(); |
311 char fname[32]; | |
312 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
313 FILE *fp = fopen(fname, "r"); | |
314 if (fp == NULL) { | |
315 unsafe_chroot_detected = true; | |
316 } else { | |
317 fclose(fp); | |
318 } | |
319 } | |
320 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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321 assert(processor_count() > 0, "linux error"); |
0 | 322 } |
323 | |
324 void os::init_system_properties_values() { | |
325 // The next steps are taken in the product version: | |
326 // | |
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327 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 328 // This library should be located at: |
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329 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 330 // |
331 // If "/jre/lib/" appears at the right place in the path, then we | |
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332 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 333 // |
334 // Otherwise exit with message: "Could not create the Java virtual machine." | |
335 // | |
336 // The following extra steps are taken in the debugging version: | |
337 // | |
338 // If "/jre/lib/" does NOT appear at the right place in the path | |
339 // instead of exit check for $JAVA_HOME environment variable. | |
340 // | |
341 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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342 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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343 // it looks like libjvm.so is installed there |
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344 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 345 // |
346 // Otherwise exit. | |
347 // | |
348 // Important note: if the location of libjvm.so changes this | |
349 // code needs to be changed accordingly. | |
350 | |
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351 // See ld(1): |
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352 // The linker uses the following search paths to locate required |
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353 // shared libraries: |
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354 // 1: ... |
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355 // ... |
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356 // 7: The default directories, normally /lib and /usr/lib. |
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357 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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358 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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359 #else |
0 | 360 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
509
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361 #endif |
0 | 362 |
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363 // Base path of extensions installed on the system. |
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364 #define SYS_EXT_DIR "/usr/java/packages" |
0 | 365 #define EXTENSIONS_DIR "/lib/ext" |
366 #define ENDORSED_DIR "/lib/endorsed" | |
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367 |
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368 // Buffer that fits several sprintfs. |
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369 // Note that the space for the colon and the trailing null are provided |
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370 // by the nulls included by the sizeof operator. |
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371 const size_t bufsize = |
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372 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
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373 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir |
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374 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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375 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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376 |
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377 // sysclasspath, java_home, dll_dir |
0 | 378 { |
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379 char *pslash; |
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380 os::jvm_path(buf, bufsize); |
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381 |
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382 // Found the full path to libjvm.so. |
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383 // Now cut the path to <java_home>/jre if we can. |
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384 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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385 pslash = strrchr(buf, '/'); |
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386 if (pslash != NULL) { |
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387 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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388 } |
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389 Arguments::set_dll_dir(buf); |
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390 |
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391 if (pslash != NULL) { |
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392 pslash = strrchr(buf, '/'); |
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393 if (pslash != NULL) { |
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394 *pslash = '\0'; // Get rid of /<arch>. |
0 | 395 pslash = strrchr(buf, '/'); |
396 if (pslash != NULL) { | |
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397 *pslash = '\0'; // Get rid of /lib. |
0 | 398 } |
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399 } |
0 | 400 } |
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401 Arguments::set_java_home(buf); |
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402 set_boot_path('/', ':'); |
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403 } |
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404 |
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405 // Where to look for native libraries. |
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406 // |
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407 // Note: Due to a legacy implementation, most of the library path |
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408 // is set in the launcher. This was to accomodate linking restrictions |
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409 // on legacy Linux implementations (which are no longer supported). |
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410 // Eventually, all the library path setting will be done here. |
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411 // |
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412 // However, to prevent the proliferation of improperly built native |
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413 // libraries, the new path component /usr/java/packages is added here. |
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414 // Eventually, all the library path setting will be done here. |
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415 { |
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416 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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417 // should always exist (until the legacy problem cited above is |
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418 // addressed). |
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419 const char *v = ::getenv("LD_LIBRARY_PATH"); |
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420 const char *v_colon = ":"; |
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421 if (v == NULL) { v = ""; v_colon = ""; } |
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422 // That's +1 for the colon and +1 for the trailing '\0'. |
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423 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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424 strlen(v) + 1 + |
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425 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
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426 mtInternal); |
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427 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
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428 Arguments::set_library_path(ld_library_path); |
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429 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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430 } |
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431 |
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432 // Extensions directories. |
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433 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
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434 Arguments::set_ext_dirs(buf); |
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435 |
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436 // Endorsed standards default directory. |
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437 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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438 Arguments::set_endorsed_dirs(buf); |
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439 |
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440 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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441 |
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442 #undef DEFAULT_LIBPATH |
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443 #undef SYS_EXT_DIR |
0 | 444 #undef EXTENSIONS_DIR |
445 #undef ENDORSED_DIR | |
446 } | |
447 | |
448 //////////////////////////////////////////////////////////////////////////////// | |
449 // breakpoint support | |
450 | |
451 void os::breakpoint() { | |
452 BREAKPOINT; | |
453 } | |
454 | |
455 extern "C" void breakpoint() { | |
456 // use debugger to set breakpoint here | |
457 } | |
458 | |
459 //////////////////////////////////////////////////////////////////////////////// | |
460 // signal support | |
461 | |
462 debug_only(static bool signal_sets_initialized = false); | |
463 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
464 | |
465 bool os::Linux::is_sig_ignored(int sig) { | |
466 struct sigaction oact; | |
467 sigaction(sig, (struct sigaction*)NULL, &oact); | |
468 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
469 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
470 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
471 return true; | |
472 else | |
473 return false; | |
474 } | |
475 | |
476 void os::Linux::signal_sets_init() { | |
477 // Should also have an assertion stating we are still single-threaded. | |
478 assert(!signal_sets_initialized, "Already initialized"); | |
479 // Fill in signals that are necessarily unblocked for all threads in | |
480 // the VM. Currently, we unblock the following signals: | |
481 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
482 // by -Xrs (=ReduceSignalUsage)); | |
483 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
484 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
485 // the dispositions or masks wrt these signals. | |
486 // Programs embedding the VM that want to use the above signals for their | |
487 // own purposes must, at this time, use the "-Xrs" option to prevent | |
488 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
489 // (See bug 4345157, and other related bugs). | |
490 // In reality, though, unblocking these signals is really a nop, since | |
491 // these signals are not blocked by default. | |
492 sigemptyset(&unblocked_sigs); | |
493 sigemptyset(&allowdebug_blocked_sigs); | |
494 sigaddset(&unblocked_sigs, SIGILL); | |
495 sigaddset(&unblocked_sigs, SIGSEGV); | |
496 sigaddset(&unblocked_sigs, SIGBUS); | |
497 sigaddset(&unblocked_sigs, SIGFPE); | |
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498 #if defined(PPC64) |
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499 sigaddset(&unblocked_sigs, SIGTRAP); |
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500 #endif |
0 | 501 sigaddset(&unblocked_sigs, SR_signum); |
502 | |
503 if (!ReduceSignalUsage) { | |
504 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
505 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
506 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
507 } | |
508 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
509 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
510 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
511 } | |
512 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
513 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
514 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
515 } | |
516 } | |
517 // Fill in signals that are blocked by all but the VM thread. | |
518 sigemptyset(&vm_sigs); | |
519 if (!ReduceSignalUsage) | |
520 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
521 debug_only(signal_sets_initialized = true); | |
522 | |
523 } | |
524 | |
525 // These are signals that are unblocked while a thread is running Java. | |
526 // (For some reason, they get blocked by default.) | |
527 sigset_t* os::Linux::unblocked_signals() { | |
528 assert(signal_sets_initialized, "Not initialized"); | |
529 return &unblocked_sigs; | |
530 } | |
531 | |
532 // These are the signals that are blocked while a (non-VM) thread is | |
533 // running Java. Only the VM thread handles these signals. | |
534 sigset_t* os::Linux::vm_signals() { | |
535 assert(signal_sets_initialized, "Not initialized"); | |
536 return &vm_sigs; | |
537 } | |
538 | |
539 // These are signals that are blocked during cond_wait to allow debugger in | |
540 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
541 assert(signal_sets_initialized, "Not initialized"); | |
542 return &allowdebug_blocked_sigs; | |
543 } | |
544 | |
545 void os::Linux::hotspot_sigmask(Thread* thread) { | |
546 | |
547 //Save caller's signal mask before setting VM signal mask | |
548 sigset_t caller_sigmask; | |
549 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
550 | |
551 OSThread* osthread = thread->osthread(); | |
552 osthread->set_caller_sigmask(caller_sigmask); | |
553 | |
554 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
555 | |
556 if (!ReduceSignalUsage) { | |
557 if (thread->is_VM_thread()) { | |
558 // Only the VM thread handles BREAK_SIGNAL ... | |
559 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
560 } else { | |
561 // ... all other threads block BREAK_SIGNAL | |
562 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
563 } | |
564 } | |
565 } | |
566 | |
567 ////////////////////////////////////////////////////////////////////////////// | |
568 // detecting pthread library | |
569 | |
570 void os::Linux::libpthread_init() { | |
571 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
572 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
573 // generic name for earlier versions. | |
574 // Define macros here so we can build HotSpot on old systems. | |
575 # ifndef _CS_GNU_LIBC_VERSION | |
576 # define _CS_GNU_LIBC_VERSION 2 | |
577 # endif | |
578 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
579 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
580 # endif | |
581 | |
582 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
583 if (n > 0) { | |
6197 | 584 char *str = (char *)malloc(n, mtInternal); |
0 | 585 confstr(_CS_GNU_LIBC_VERSION, str, n); |
586 os::Linux::set_glibc_version(str); | |
587 } else { | |
588 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
589 static char _gnu_libc_version[32]; | |
590 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
591 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
592 os::Linux::set_glibc_version(_gnu_libc_version); | |
593 } | |
594 | |
595 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
596 if (n > 0) { | |
6197 | 597 char *str = (char *)malloc(n, mtInternal); |
0 | 598 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
599 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
600 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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601 // is the case. LinuxThreads has a hard limit on max number of threads. |
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602 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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603 // On the other hand, NPTL does not have such a limit, sysconf() |
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604 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 605 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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606 strstr(str, "NPTL") && |
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607 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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608 free(str); |
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609 os::Linux::set_libpthread_version("linuxthreads"); |
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610 } else { |
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611 os::Linux::set_libpthread_version(str); |
0 | 612 } |
613 } else { | |
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614 // glibc before 2.3.2 only has LinuxThreads. |
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615 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 616 } |
617 | |
618 if (strstr(libpthread_version(), "NPTL")) { | |
619 os::Linux::set_is_NPTL(); | |
620 } else { | |
621 os::Linux::set_is_LinuxThreads(); | |
622 } | |
623 | |
624 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
625 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
626 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
627 os::Linux::set_is_floating_stack(); | |
628 } | |
629 } | |
630 | |
631 ///////////////////////////////////////////////////////////////////////////// | |
632 // thread stack | |
633 | |
634 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
635 // to the stack guard, caller should block all signals. | |
636 // | |
637 // MAP_GROWSDOWN: | |
638 // A special mmap() flag that is used to implement thread stacks. It tells | |
639 // kernel that the memory region should extend downwards when needed. This | |
640 // allows early versions of LinuxThreads to only mmap the first few pages | |
641 // when creating a new thread. Linux kernel will automatically expand thread | |
642 // stack as needed (on page faults). | |
643 // | |
644 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
645 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
646 // region, it's hard to tell if the fault is due to a legitimate stack | |
647 // access or because of reading/writing non-exist memory (e.g. buffer | |
648 // overrun). As a rule, if the fault happens below current stack pointer, | |
649 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
650 // application (see Linux kernel fault.c). | |
651 // | |
652 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
653 // stack overflow detection. | |
654 // | |
655 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
656 // not use this flag. However, the stack of initial thread is not created | |
657 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
658 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
659 // and then attach the thread to JVM. | |
660 // | |
661 // To get around the problem and allow stack banging on Linux, we need to | |
662 // manually expand thread stack after receiving the SIGSEGV. | |
663 // | |
664 // There are two ways to expand thread stack to address "bottom", we used | |
665 // both of them in JVM before 1.5: | |
666 // 1. adjust stack pointer first so that it is below "bottom", and then | |
667 // touch "bottom" | |
668 // 2. mmap() the page in question | |
669 // | |
670 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
671 // if current sp is already near the lower end of page 101, and we need to | |
672 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
673 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
674 // That will destroy the mmap() frame and cause VM to crash. | |
675 // | |
676 // The following code works by adjusting sp first, then accessing the "bottom" | |
677 // page to force a page fault. Linux kernel will then automatically expand the | |
678 // stack mapping. | |
679 // | |
680 // _expand_stack_to() assumes its frame size is less than page size, which | |
681 // should always be true if the function is not inlined. | |
682 | |
683 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
684 #define NOINLINE | |
685 #else | |
686 #define NOINLINE __attribute__ ((noinline)) | |
687 #endif | |
688 | |
689 static void _expand_stack_to(address bottom) NOINLINE; | |
690 | |
691 static void _expand_stack_to(address bottom) { | |
692 address sp; | |
693 size_t size; | |
694 volatile char *p; | |
695 | |
696 // Adjust bottom to point to the largest address within the same page, it | |
697 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
698 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
699 bottom += os::Linux::page_size() - 1; | |
700 | |
701 // sp might be slightly above current stack pointer; if that's the case, we | |
702 // will alloca() a little more space than necessary, which is OK. Don't use | |
703 // os::current_stack_pointer(), as its result can be slightly below current | |
704 // stack pointer, causing us to not alloca enough to reach "bottom". | |
705 sp = (address)&sp; | |
706 | |
707 if (sp > bottom) { | |
708 size = sp - bottom; | |
709 p = (volatile char *)alloca(size); | |
710 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
711 p[0] = '\0'; | |
712 } | |
713 } | |
714 | |
715 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
716 assert(t!=NULL, "just checking"); | |
717 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
718 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
719 | |
720 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
721 sigset_t mask_all, old_sigset; | |
722 sigfillset(&mask_all); | |
723 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
724 _expand_stack_to(addr); | |
725 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
726 return true; | |
727 } | |
728 return false; | |
729 } | |
730 | |
731 ////////////////////////////////////////////////////////////////////////////// | |
732 // create new thread | |
733 | |
734 static address highest_vm_reserved_address(); | |
735 | |
736 // check if it's safe to start a new thread | |
737 static bool _thread_safety_check(Thread* thread) { | |
738 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
739 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
740 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
741 // allocated (MAP_FIXED) from high address space. Every thread stack | |
742 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
743 // it to other values if they rebuild LinuxThreads). | |
744 // | |
745 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
746 // the memory region has already been mmap'ed. That means if we have too | |
747 // many threads and/or very large heap, eventually thread stack will | |
748 // collide with heap. | |
749 // | |
750 // Here we try to prevent heap/stack collision by comparing current | |
751 // stack bottom with the highest address that has been mmap'ed by JVM | |
752 // plus a safety margin for memory maps created by native code. | |
753 // | |
754 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
755 // | |
756 if (ThreadSafetyMargin > 0) { | |
757 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
758 | |
759 // not safe if our stack extends below the safety margin | |
760 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
761 } else { | |
762 return true; | |
763 } | |
764 } else { | |
765 // Floating stack LinuxThreads or NPTL: | |
766 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
767 // there's not enough space left, pthread_create() will fail. If we come | |
768 // here, that means enough space has been reserved for stack. | |
769 return true; | |
770 } | |
771 } | |
772 | |
773 // Thread start routine for all newly created threads | |
774 static void *java_start(Thread *thread) { | |
775 // Try to randomize the cache line index of hot stack frames. | |
776 // This helps when threads of the same stack traces evict each other's | |
777 // cache lines. The threads can be either from the same JVM instance, or | |
778 // from different JVM instances. The benefit is especially true for | |
779 // processors with hyperthreading technology. | |
780 static int counter = 0; | |
781 int pid = os::current_process_id(); | |
782 alloca(((pid ^ counter++) & 7) * 128); | |
783 | |
784 ThreadLocalStorage::set_thread(thread); | |
785 | |
786 OSThread* osthread = thread->osthread(); | |
787 Monitor* sync = osthread->startThread_lock(); | |
788 | |
789 // non floating stack LinuxThreads needs extra check, see above | |
790 if (!_thread_safety_check(thread)) { | |
791 // notify parent thread | |
792 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
793 osthread->set_state(ZOMBIE); | |
794 sync->notify_all(); | |
795 return NULL; | |
796 } | |
797 | |
798 // thread_id is kernel thread id (similar to Solaris LWP id) | |
799 osthread->set_thread_id(os::Linux::gettid()); | |
800 | |
801 if (UseNUMA) { | |
802 int lgrp_id = os::numa_get_group_id(); | |
803 if (lgrp_id != -1) { | |
804 thread->set_lgrp_id(lgrp_id); | |
805 } | |
806 } | |
807 // initialize signal mask for this thread | |
808 os::Linux::hotspot_sigmask(thread); | |
809 | |
810 // initialize floating point control register | |
811 os::Linux::init_thread_fpu_state(); | |
812 | |
813 // handshaking with parent thread | |
814 { | |
815 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
816 | |
817 // notify parent thread | |
818 osthread->set_state(INITIALIZED); | |
819 sync->notify_all(); | |
820 | |
821 // wait until os::start_thread() | |
822 while (osthread->get_state() == INITIALIZED) { | |
823 sync->wait(Mutex::_no_safepoint_check_flag); | |
824 } | |
825 } | |
826 | |
827 // call one more level start routine | |
828 thread->run(); | |
829 | |
830 return 0; | |
831 } | |
832 | |
833 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
834 assert(thread->osthread() == NULL, "caller responsible"); | |
835 | |
836 // Allocate the OSThread object | |
837 OSThread* osthread = new OSThread(NULL, NULL); | |
838 if (osthread == NULL) { | |
839 return false; | |
840 } | |
841 | |
842 // set the correct thread state | |
843 osthread->set_thread_type(thr_type); | |
844 | |
845 // Initial state is ALLOCATED but not INITIALIZED | |
846 osthread->set_state(ALLOCATED); | |
847 | |
848 thread->set_osthread(osthread); | |
849 | |
850 // init thread attributes | |
851 pthread_attr_t attr; | |
852 pthread_attr_init(&attr); | |
853 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
854 | |
855 // stack size | |
856 if (os::Linux::supports_variable_stack_size()) { | |
857 // calculate stack size if it's not specified by caller | |
858 if (stack_size == 0) { | |
859 stack_size = os::Linux::default_stack_size(thr_type); | |
860 | |
861 switch (thr_type) { | |
862 case os::java_thread: | |
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863 // Java threads use ThreadStackSize which default value can be |
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864 // changed with the flag -Xss |
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865 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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866 stack_size = JavaThread::stack_size_at_create(); |
0 | 867 break; |
868 case os::compiler_thread: | |
869 if (CompilerThreadStackSize > 0) { | |
870 stack_size = (size_t)(CompilerThreadStackSize * K); | |
871 break; | |
872 } // else fall through: | |
873 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
874 case os::vm_thread: | |
875 case os::pgc_thread: | |
876 case os::cgc_thread: | |
877 case os::watcher_thread: | |
878 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
879 break; | |
880 } | |
881 } | |
882 | |
883 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
884 pthread_attr_setstacksize(&attr, stack_size); | |
885 } else { | |
886 // let pthread_create() pick the default value. | |
887 } | |
888 | |
889 // glibc guard page | |
890 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
891 | |
892 ThreadState state; | |
893 | |
894 { | |
895 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
896 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
897 if (lock) { | |
898 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
899 } | |
900 | |
901 pthread_t tid; | |
902 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
903 | |
904 pthread_attr_destroy(&attr); | |
905 | |
906 if (ret != 0) { | |
907 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
908 perror("pthread_create()"); | |
909 } | |
910 // Need to clean up stuff we've allocated so far | |
911 thread->set_osthread(NULL); | |
912 delete osthread; | |
913 if (lock) os::Linux::createThread_lock()->unlock(); | |
914 return false; | |
915 } | |
916 | |
917 // Store pthread info into the OSThread | |
918 osthread->set_pthread_id(tid); | |
919 | |
920 // Wait until child thread is either initialized or aborted | |
921 { | |
922 Monitor* sync_with_child = osthread->startThread_lock(); | |
923 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
924 while ((state = osthread->get_state()) == ALLOCATED) { | |
925 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
926 } | |
927 } | |
928 | |
929 if (lock) { | |
930 os::Linux::createThread_lock()->unlock(); | |
931 } | |
932 } | |
933 | |
934 // Aborted due to thread limit being reached | |
935 if (state == ZOMBIE) { | |
936 thread->set_osthread(NULL); | |
937 delete osthread; | |
938 return false; | |
939 } | |
940 | |
941 // The thread is returned suspended (in state INITIALIZED), | |
942 // and is started higher up in the call chain | |
943 assert(state == INITIALIZED, "race condition"); | |
944 return true; | |
945 } | |
946 | |
947 ///////////////////////////////////////////////////////////////////////////// | |
948 // attach existing thread | |
949 | |
950 // bootstrap the main thread | |
951 bool os::create_main_thread(JavaThread* thread) { | |
952 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
953 return create_attached_thread(thread); | |
954 } | |
955 | |
956 bool os::create_attached_thread(JavaThread* thread) { | |
957 #ifdef ASSERT | |
958 thread->verify_not_published(); | |
959 #endif | |
960 | |
961 // Allocate the OSThread object | |
962 OSThread* osthread = new OSThread(NULL, NULL); | |
963 | |
964 if (osthread == NULL) { | |
965 return false; | |
966 } | |
967 | |
968 // Store pthread info into the OSThread | |
969 osthread->set_thread_id(os::Linux::gettid()); | |
970 osthread->set_pthread_id(::pthread_self()); | |
971 | |
972 // initialize floating point control register | |
973 os::Linux::init_thread_fpu_state(); | |
974 | |
975 // Initial thread state is RUNNABLE | |
976 osthread->set_state(RUNNABLE); | |
977 | |
978 thread->set_osthread(osthread); | |
979 | |
980 if (UseNUMA) { | |
981 int lgrp_id = os::numa_get_group_id(); | |
982 if (lgrp_id != -1) { | |
983 thread->set_lgrp_id(lgrp_id); | |
984 } | |
985 } | |
986 | |
987 if (os::Linux::is_initial_thread()) { | |
988 // If current thread is initial thread, its stack is mapped on demand, | |
989 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
990 // the entire stack region to avoid SEGV in stack banging. | |
991 // It is also useful to get around the heap-stack-gap problem on SuSE | |
992 // kernel (see 4821821 for details). We first expand stack to the top | |
993 // of yellow zone, then enable stack yellow zone (order is significant, | |
994 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
995 // is no gap between the last two virtual memory regions. | |
996 | |
997 JavaThread *jt = (JavaThread *)thread; | |
998 address addr = jt->stack_yellow_zone_base(); | |
999 assert(addr != NULL, "initialization problem?"); | |
1000 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
1001 | |
1002 osthread->set_expanding_stack(); | |
1003 os::Linux::manually_expand_stack(jt, addr); | |
1004 osthread->clear_expanding_stack(); | |
1005 } | |
1006 | |
1007 // initialize signal mask for this thread | |
1008 // and save the caller's signal mask | |
1009 os::Linux::hotspot_sigmask(thread); | |
1010 | |
1011 return true; | |
1012 } | |
1013 | |
1014 void os::pd_start_thread(Thread* thread) { | |
1015 OSThread * osthread = thread->osthread(); | |
1016 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
1017 Monitor* sync_with_child = osthread->startThread_lock(); | |
1018 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
1019 sync_with_child->notify(); | |
1020 } | |
1021 | |
1022 // Free Linux resources related to the OSThread | |
1023 void os::free_thread(OSThread* osthread) { | |
1024 assert(osthread != NULL, "osthread not set"); | |
1025 | |
1026 if (Thread::current()->osthread() == osthread) { | |
1027 // Restore caller's signal mask | |
1028 sigset_t sigmask = osthread->caller_sigmask(); | |
1029 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1030 } | |
1031 | |
1032 delete osthread; | |
1033 } | |
1034 | |
1035 ////////////////////////////////////////////////////////////////////////////// | |
1036 // thread local storage | |
1037 | |
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1038 // Restore the thread pointer if the destructor is called. This is in case |
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1039 // someone from JNI code sets up a destructor with pthread_key_create to run |
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1040 // detachCurrentThread on thread death. Unless we restore the thread pointer we |
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1041 // will hang or crash. When detachCurrentThread is called the key will be set |
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1042 // to null and we will not be called again. If detachCurrentThread is never |
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1043 // called we could loop forever depending on the pthread implementation. |
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1044 static void restore_thread_pointer(void* p) { |
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1045 Thread* thread = (Thread*) p; |
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1046 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); |
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1047 } |
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1048 |
0 | 1049 int os::allocate_thread_local_storage() { |
1050 pthread_key_t key; | |
17845
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1051 int rslt = pthread_key_create(&key, restore_thread_pointer); |
0 | 1052 assert(rslt == 0, "cannot allocate thread local storage"); |
1053 return (int)key; | |
1054 } | |
1055 | |
1056 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1057 // on VM exit. | |
1058 void os::free_thread_local_storage(int index) { | |
1059 int rslt = pthread_key_delete((pthread_key_t)index); | |
1060 assert(rslt == 0, "invalid index"); | |
1061 } | |
1062 | |
1063 void os::thread_local_storage_at_put(int index, void* value) { | |
1064 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1065 assert(rslt == 0, "pthread_setspecific failed"); | |
1066 } | |
1067 | |
1068 extern "C" Thread* get_thread() { | |
1069 return ThreadLocalStorage::thread(); | |
1070 } | |
1071 | |
1072 ////////////////////////////////////////////////////////////////////////////// | |
1073 // initial thread | |
1074 | |
1075 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1076 bool os::Linux::is_initial_thread(void) { | |
1077 char dummy; | |
1078 // If called before init complete, thread stack bottom will be null. | |
1079 // Can be called if fatal error occurs before initialization. | |
1080 if (initial_thread_stack_bottom() == NULL) return false; | |
1081 assert(initial_thread_stack_bottom() != NULL && | |
1082 initial_thread_stack_size() != 0, | |
1083 "os::init did not locate initial thread's stack region"); | |
1084 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1085 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1086 return true; | |
1087 else return false; | |
1088 } | |
1089 | |
1090 // Find the virtual memory area that contains addr | |
1091 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1092 FILE *fp = fopen("/proc/self/maps", "r"); | |
1093 if (fp) { | |
1094 address low, high; | |
1095 while (!feof(fp)) { | |
1096 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1097 if (low <= addr && addr < high) { | |
1098 if (vma_low) *vma_low = low; | |
1099 if (vma_high) *vma_high = high; | |
1100 fclose (fp); | |
1101 return true; | |
1102 } | |
1103 } | |
1104 for (;;) { | |
1105 int ch = fgetc(fp); | |
1106 if (ch == EOF || ch == (int)'\n') break; | |
1107 } | |
1108 } | |
1109 fclose(fp); | |
1110 } | |
1111 return false; | |
1112 } | |
1113 | |
1114 // Locate initial thread stack. This special handling of initial thread stack | |
1115 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1116 // bogus value for initial thread. | |
1117 void os::Linux::capture_initial_stack(size_t max_size) { | |
1118 // stack size is the easy part, get it from RLIMIT_STACK | |
1119 size_t stack_size; | |
1120 struct rlimit rlim; | |
1121 getrlimit(RLIMIT_STACK, &rlim); | |
1122 stack_size = rlim.rlim_cur; | |
1123 | |
1124 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1125 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1126 // so we won't install guard page on ld.so's data section. | |
1127 stack_size -= 2 * page_size(); | |
1128 | |
1129 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1130 // 7.1, in both cases we will get 2G in return value. | |
1131 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1132 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1133 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1134 // in case other parts in glibc still assumes 2M max stack size. | |
1135 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1136 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1137 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1138 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1139 // Try to figure out where the stack base (top) is. This is harder. |
1140 // | |
1141 // When an application is started, glibc saves the initial stack pointer in | |
1142 // a global variable "__libc_stack_end", which is then used by system | |
1143 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1144 // variable is available since the very early days. However, because it is | |
1145 // a private interface, it could disappear in the future. | |
1146 // | |
1147 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1148 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1149 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1150 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1151 // /proc/<pid>/stat could change in the future (though unlikely). | |
1152 // | |
1153 // We try __libc_stack_end first. If that doesn't work, look for | |
1154 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1155 // as a hint, which should work well in most cases. | |
1156 | |
1157 uintptr_t stack_start; | |
1158 | |
1159 // try __libc_stack_end first | |
1160 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1161 if (p && *p) { | |
1162 stack_start = *p; | |
1163 } else { | |
1164 // see if we can get the start_stack field from /proc/self/stat | |
1165 FILE *fp; | |
1166 int pid; | |
1167 char state; | |
1168 int ppid; | |
1169 int pgrp; | |
1170 int session; | |
1171 int nr; | |
1172 int tpgrp; | |
1173 unsigned long flags; | |
1174 unsigned long minflt; | |
1175 unsigned long cminflt; | |
1176 unsigned long majflt; | |
1177 unsigned long cmajflt; | |
1178 unsigned long utime; | |
1179 unsigned long stime; | |
1180 long cutime; | |
1181 long cstime; | |
1182 long prio; | |
1183 long nice; | |
1184 long junk; | |
1185 long it_real; | |
1186 uintptr_t start; | |
1187 uintptr_t vsize; | |
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1188 intptr_t rss; |
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1189 uintptr_t rsslim; |
0 | 1190 uintptr_t scodes; |
1191 uintptr_t ecode; | |
1192 int i; | |
1193 | |
1194 // Figure what the primordial thread stack base is. Code is inspired | |
1195 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1196 // followed by command name surrounded by parentheses, state, etc. | |
1197 char stat[2048]; | |
1198 int statlen; | |
1199 | |
1200 fp = fopen("/proc/self/stat", "r"); | |
1201 if (fp) { | |
1202 statlen = fread(stat, 1, 2047, fp); | |
1203 stat[statlen] = '\0'; | |
1204 fclose(fp); | |
1205 | |
1206 // Skip pid and the command string. Note that we could be dealing with | |
1207 // weird command names, e.g. user could decide to rename java launcher | |
1208 // to "java 1.4.2 :)", then the stat file would look like | |
1209 // 1234 (java 1.4.2 :)) R ... ... | |
1210 // We don't really need to know the command string, just find the last | |
1211 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1212 char * s = strrchr(stat, ')'); | |
1213 | |
1214 i = 0; | |
1215 if (s) { | |
1216 // Skip blank chars | |
1217 do s++; while (isspace(*s)); | |
1218 | |
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1219 #define _UFM UINTX_FORMAT |
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1220 #define _DFM INTX_FORMAT |
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1221 |
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1222 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1223 /* 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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1224 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 | 1225 &state, /* 3 %c */ |
1226 &ppid, /* 4 %d */ | |
1227 &pgrp, /* 5 %d */ | |
1228 &session, /* 6 %d */ | |
1229 &nr, /* 7 %d */ | |
1230 &tpgrp, /* 8 %d */ | |
1231 &flags, /* 9 %lu */ | |
1232 &minflt, /* 10 %lu */ | |
1233 &cminflt, /* 11 %lu */ | |
1234 &majflt, /* 12 %lu */ | |
1235 &cmajflt, /* 13 %lu */ | |
1236 &utime, /* 14 %lu */ | |
1237 &stime, /* 15 %lu */ | |
1238 &cutime, /* 16 %ld */ | |
1239 &cstime, /* 17 %ld */ | |
1240 &prio, /* 18 %ld */ | |
1241 &nice, /* 19 %ld */ | |
1242 &junk, /* 20 %ld */ | |
1243 &it_real, /* 21 %ld */ | |
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1244 &start, /* 22 UINTX_FORMAT */ |
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1245 &vsize, /* 23 UINTX_FORMAT */ |
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1246 &rss, /* 24 INTX_FORMAT */ |
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1247 &rsslim, /* 25 UINTX_FORMAT */ |
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1248 &scodes, /* 26 UINTX_FORMAT */ |
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1249 &ecode, /* 27 UINTX_FORMAT */ |
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1250 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1251 } |
1252 | |
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1253 #undef _UFM |
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1254 #undef _DFM |
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1255 |
0 | 1256 if (i != 28 - 2) { |
1257 assert(false, "Bad conversion from /proc/self/stat"); | |
1258 // product mode - assume we are the initial thread, good luck in the | |
1259 // embedded case. | |
1260 warning("Can't detect initial thread stack location - bad conversion"); | |
1261 stack_start = (uintptr_t) &rlim; | |
1262 } | |
1263 } else { | |
1264 // For some reason we can't open /proc/self/stat (for example, running on | |
1265 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1266 // most cases, so don't abort: | |
1267 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1268 stack_start = (uintptr_t) &rlim; | |
1269 } | |
1270 } | |
1271 | |
1272 // Now we have a pointer (stack_start) very close to the stack top, the | |
1273 // next thing to do is to figure out the exact location of stack top. We | |
1274 // can find out the virtual memory area that contains stack_start by | |
1275 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1276 // and its upper limit is the real stack top. (again, this would fail if | |
1277 // running inside chroot, because /proc may not exist.) | |
1278 | |
1279 uintptr_t stack_top; | |
1280 address low, high; | |
1281 if (find_vma((address)stack_start, &low, &high)) { | |
1282 // success, "high" is the true stack top. (ignore "low", because initial | |
1283 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1284 stack_top = (uintptr_t)high; | |
1285 } else { | |
1286 // failed, likely because /proc/self/maps does not exist | |
1287 warning("Can't detect initial thread stack location - find_vma failed"); | |
1288 // best effort: stack_start is normally within a few pages below the real | |
1289 // stack top, use it as stack top, and reduce stack size so we won't put | |
1290 // guard page outside stack. | |
1291 stack_top = stack_start; | |
1292 stack_size -= 16 * page_size(); | |
1293 } | |
1294 | |
1295 // stack_top could be partially down the page so align it | |
1296 stack_top = align_size_up(stack_top, page_size()); | |
1297 | |
1298 if (max_size && stack_size > max_size) { | |
1299 _initial_thread_stack_size = max_size; | |
1300 } else { | |
1301 _initial_thread_stack_size = stack_size; | |
1302 } | |
1303 | |
1304 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1305 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1306 } | |
1307 | |
1308 //////////////////////////////////////////////////////////////////////////////// | |
1309 // time support | |
1310 | |
1311 // Time since start-up in seconds to a fine granularity. | |
1312 // Used by VMSelfDestructTimer and the MemProfiler. | |
1313 double os::elapsedTime() { | |
1314 | |
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1315 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution |
0 | 1316 } |
1317 | |
1318 jlong os::elapsed_counter() { | |
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1319 return javaTimeNanos() - initial_time_count; |
0 | 1320 } |
1321 | |
1322 jlong os::elapsed_frequency() { | |
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1323 return NANOSECS_PER_SEC; // nanosecond resolution |
0 | 1324 } |
1325 | |
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1326 bool os::supports_vtime() { return true; } |
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1327 bool os::enable_vtime() { return false; } |
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1328 bool os::vtime_enabled() { return false; } |
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1329 |
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1330 double os::elapsedVTime() { |
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1331 struct rusage usage; |
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1332 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1333 if (retval == 0) { |
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1334 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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1335 } else { |
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1336 // better than nothing, but not much |
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1337 return elapsedTime(); |
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1338 } |
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1339 } |
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1340 |
61 | 1341 jlong os::javaTimeMillis() { |
0 | 1342 timeval time; |
1343 int status = gettimeofday(&time, NULL); | |
1344 assert(status != -1, "linux error"); | |
1345 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1346 } | |
1347 | |
1348 #ifndef CLOCK_MONOTONIC | |
1349 #define CLOCK_MONOTONIC (1) | |
1350 #endif | |
1351 | |
1352 void os::Linux::clock_init() { | |
1353 // we do dlopen's in this particular order due to bug in linux | |
1354 // dynamical loader (see 6348968) leading to crash on exit | |
1355 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1356 if (handle == NULL) { | |
1357 handle = dlopen("librt.so", RTLD_LAZY); | |
1358 } | |
1359 | |
1360 if (handle) { | |
1361 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1362 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1363 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1364 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1365 if (clock_getres_func && clock_gettime_func) { | |
1366 // See if monotonic clock is supported by the kernel. Note that some | |
1367 // early implementations simply return kernel jiffies (updated every | |
1368 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1369 // for nano time (though the monotonic property is still nice to have). | |
1370 // It's fixed in newer kernels, however clock_getres() still returns | |
1371 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1372 // resolution for now. Hopefully as people move to new kernels, this | |
1373 // won't be a problem. | |
1374 struct timespec res; | |
1375 struct timespec tp; | |
1376 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1377 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1378 // yes, monotonic clock is supported | |
1379 _clock_gettime = clock_gettime_func; | |
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1380 return; |
0 | 1381 } else { |
1382 // close librt if there is no monotonic clock | |
1383 dlclose(handle); | |
1384 } | |
1385 } | |
1386 } | |
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1387 warning("No monotonic clock was available - timed services may " \ |
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1388 "be adversely affected if the time-of-day clock changes"); |
0 | 1389 } |
1390 | |
1391 #ifndef SYS_clock_getres | |
1392 | |
1393 #if defined(IA32) || defined(AMD64) | |
1394 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1395 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1396 #else |
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1397 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1398 #define sys_clock_getres(x,y) -1 |
0 | 1399 #endif |
1400 | |
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1401 #else |
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1402 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1403 #endif |
1404 | |
1405 void os::Linux::fast_thread_clock_init() { | |
1406 if (!UseLinuxPosixThreadCPUClocks) { | |
1407 return; | |
1408 } | |
1409 clockid_t clockid; | |
1410 struct timespec tp; | |
1411 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1412 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1413 | |
1414 // Switch to using fast clocks for thread cpu time if | |
1415 // the sys_clock_getres() returns 0 error code. | |
1416 // Note, that some kernels may support the current thread | |
1417 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1418 // returned by the pthread_getcpuclockid(). | |
1419 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1420 // must return at least tp.tv_sec == 0 which means a resolution | |
1421 // better than 1 sec. This is extra check for reliability. | |
1422 | |
1423 if(pthread_getcpuclockid_func && | |
1424 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1425 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1426 | |
1427 _supports_fast_thread_cpu_time = true; | |
1428 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1429 } | |
1430 } | |
1431 | |
1432 jlong os::javaTimeNanos() { | |
1433 if (Linux::supports_monotonic_clock()) { | |
1434 struct timespec tp; | |
1435 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1436 assert(status == 0, "gettime error"); | |
1437 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1438 return result; | |
1439 } else { | |
1440 timeval time; | |
1441 int status = gettimeofday(&time, NULL); | |
1442 assert(status != -1, "linux error"); | |
1443 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1444 return 1000 * usecs; | |
1445 } | |
1446 } | |
1447 | |
1448 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1449 if (Linux::supports_monotonic_clock()) { | |
1450 info_ptr->max_value = ALL_64_BITS; | |
1451 | |
1452 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1453 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1454 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1455 } else { | |
1456 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1457 info_ptr->max_value = ALL_64_BITS; | |
1458 | |
1459 // gettimeofday is a real time clock so it skips | |
1460 info_ptr->may_skip_backward = true; | |
1461 info_ptr->may_skip_forward = true; | |
1462 } | |
1463 | |
1464 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1465 } | |
1466 | |
1467 // Return the real, user, and system times in seconds from an | |
1468 // arbitrary fixed point in the past. | |
1469 bool os::getTimesSecs(double* process_real_time, | |
1470 double* process_user_time, | |
1471 double* process_system_time) { | |
1472 struct tms ticks; | |
1473 clock_t real_ticks = times(&ticks); | |
1474 | |
1475 if (real_ticks == (clock_t) (-1)) { | |
1476 return false; | |
1477 } else { | |
1478 double ticks_per_second = (double) clock_tics_per_sec; | |
1479 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1480 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1481 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1482 | |
1483 return true; | |
1484 } | |
1485 } | |
1486 | |
1487 | |
1488 char * os::local_time_string(char *buf, size_t buflen) { | |
1489 struct tm t; | |
1490 time_t long_time; | |
1491 time(&long_time); | |
1492 localtime_r(&long_time, &t); | |
1493 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1494 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1495 t.tm_hour, t.tm_min, t.tm_sec); | |
1496 return buf; | |
1497 } | |
1498 | |
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1499 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1500 return localtime_r(clock, res); |
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|
1501 } |
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|
1502 |
0 | 1503 //////////////////////////////////////////////////////////////////////////////// |
1504 // runtime exit support | |
1505 | |
1506 // Note: os::shutdown() might be called very early during initialization, or | |
1507 // called from signal handler. Before adding something to os::shutdown(), make | |
1508 // sure it is async-safe and can handle partially initialized VM. | |
1509 void os::shutdown() { | |
1510 | |
1511 // allow PerfMemory to attempt cleanup of any persistent resources | |
1512 perfMemory_exit(); | |
1513 | |
1514 // needs to remove object in file system | |
1515 AttachListener::abort(); | |
1516 | |
1517 // flush buffered output, finish log files | |
1518 ostream_abort(); | |
1519 | |
1520 // Check for abort hook | |
1521 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1522 if (abort_hook != NULL) { | |
1523 abort_hook(); | |
1524 } | |
1525 | |
1526 } | |
1527 | |
1528 // Note: os::abort() might be called very early during initialization, or | |
1529 // called from signal handler. Before adding something to os::abort(), make | |
1530 // sure it is async-safe and can handle partially initialized VM. | |
1531 void os::abort(bool dump_core) { | |
1532 os::shutdown(); | |
1533 if (dump_core) { | |
1534 #ifndef PRODUCT | |
1535 fdStream out(defaultStream::output_fd()); | |
1536 out.print_raw("Current thread is "); | |
1537 char buf[16]; | |
1538 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1539 out.print_raw_cr(buf); | |
1540 out.print_raw_cr("Dumping core ..."); | |
1541 #endif | |
1542 ::abort(); // dump core | |
1543 } | |
1544 | |
1545 ::exit(1); | |
1546 } | |
1547 | |
1548 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1549 void os::die() { | |
1550 // _exit() on LinuxThreads only kills current thread | |
1551 ::abort(); | |
1552 } | |
1553 | |
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|
1554 |
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|
1555 // This method is a copy of JDK's sysGetLastErrorString |
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1556 // from src/solaris/hpi/src/system_md.c |
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|
1557 |
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|
1558 size_t os::lasterror(char *buf, size_t len) { |
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|
1559 |
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|
1560 if (errno == 0) return 0; |
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|
1561 |
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|
1562 const char *s = ::strerror(errno); |
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|
1563 size_t n = ::strlen(s); |
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|
1564 if (n >= len) { |
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|
1565 n = len - 1; |
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|
1566 } |
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|
1567 ::strncpy(buf, s, n); |
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|
1568 buf[n] = '\0'; |
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|
1569 return n; |
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|
1570 } |
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|
1571 |
0 | 1572 intx os::current_thread_id() { return (intx)pthread_self(); } |
1573 int os::current_process_id() { | |
1574 | |
1575 // Under the old linux thread library, linux gives each thread | |
1576 // its own process id. Because of this each thread will return | |
1577 // a different pid if this method were to return the result | |
1578 // of getpid(2). Linux provides no api that returns the pid | |
1579 // of the launcher thread for the vm. This implementation | |
1580 // returns a unique pid, the pid of the launcher thread | |
1581 // that starts the vm 'process'. | |
1582 | |
1583 // Under the NPTL, getpid() returns the same pid as the | |
1584 // launcher thread rather than a unique pid per thread. | |
1585 // Use gettid() if you want the old pre NPTL behaviour. | |
1586 | |
1587 // if you are looking for the result of a call to getpid() that | |
1588 // returns a unique pid for the calling thread, then look at the | |
1589 // OSThread::thread_id() method in osThread_linux.hpp file | |
1590 | |
1591 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1592 } | |
1593 | |
1594 // DLL functions | |
1595 | |
1596 const char* os::dll_file_extension() { return ".so"; } | |
1597 | |
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|
1598 // This must be hard coded because it's the system's temporary |
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|
1599 // directory not the java application's temp directory, ala java.io.tmpdir. |
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|
1600 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1601 |
691 | 1602 static bool file_exists(const char* filename) { |
1603 struct stat statbuf; | |
1604 if (filename == NULL || strlen(filename) == 0) { | |
1605 return false; | |
1606 } | |
1607 return os::stat(filename, &statbuf) == 0; | |
1608 } | |
1609 | |
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|
1610 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1611 const char* pname, const char* fname) { |
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|
1612 bool retval = false; |
691 | 1613 // Copied from libhpi |
242 | 1614 const size_t pnamelen = pname ? strlen(pname) : 0; |
1615 | |
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|
1616 // Return error on buffer overflow. |
242 | 1617 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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|
1618 return retval; |
242 | 1619 } |
1620 | |
1621 if (pnamelen == 0) { | |
691 | 1622 snprintf(buffer, buflen, "lib%s.so", fname); |
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|
1623 retval = true; |
691 | 1624 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1625 int n; | |
1626 char** pelements = split_path(pname, &n); | |
9059
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diff
changeset
|
1627 if (pelements == NULL) { |
9062 | 1628 return false; |
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17bf4d428955
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diff
changeset
|
1629 } |
691 | 1630 for (int i = 0 ; i < n ; i++) { |
1631 // Really shouldn't be NULL, but check can't hurt | |
1632 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1633 continue; // skip the empty path values | |
1634 } | |
1635 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1636 if (file_exists(buffer)) { | |
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|
1637 retval = true; |
691 | 1638 break; |
1639 } | |
1640 } | |
1641 // release the storage | |
1642 for (int i = 0 ; i < n ; i++) { | |
1643 if (pelements[i] != NULL) { | |
6197 | 1644 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1645 } |
1646 } | |
1647 if (pelements != NULL) { | |
6197 | 1648 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1649 } |
242 | 1650 } else { |
691 | 1651 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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|
1652 retval = true; |
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|
1653 } |
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1654 return retval; |
242 | 1655 } |
1656 | |
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|
1657 // check if addr is inside libjvm.so |
0 | 1658 bool os::address_is_in_vm(address addr) { |
1659 static address libjvm_base_addr; | |
1660 Dl_info dlinfo; | |
1661 | |
1662 if (libjvm_base_addr == NULL) { | |
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|
1663 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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|
1664 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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|
1665 } |
0 | 1666 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1667 } | |
1668 | |
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59b052799158
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diff
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|
1669 if (dladdr((void *)addr, &dlinfo) != 0) { |
0 | 1670 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1671 } | |
1672 | |
1673 return false; | |
1674 } | |
1675 | |
1676 bool os::dll_address_to_function_name(address addr, char *buf, | |
1677 int buflen, int *offset) { | |
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|
1678 // buf is not optional, but offset is optional |
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dcubed
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diff
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|
1679 assert(buf != NULL, "sanity check"); |
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|
1680 |
0 | 1681 Dl_info dlinfo; |
1682 | |
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diff
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|
1683 if (dladdr((void*)addr, &dlinfo) != 0) { |
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parents:
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|
1684 // see if we have a matching symbol |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1685 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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|
1686 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
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diff
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|
1687 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
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|
1688 } |
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59b052799158
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|
1689 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
59b052799158
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|
1690 return true; |
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diff
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|
1691 } |
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10986
diff
changeset
|
1692 // no matching symbol so try for just file info |
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dcubed
parents:
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diff
changeset
|
1693 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
10986
diff
changeset
|
1694 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
59b052799158
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parents:
10986
diff
changeset
|
1695 buf, buflen, offset, dlinfo.dli_fname)) { |
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parents:
10986
diff
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|
1696 return true; |
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dcubed
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diff
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|
1697 } |
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|
1698 } |
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|
1699 } |
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|
1700 |
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1701 buf[0] = '\0'; |
2022
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1702 if (offset != NULL) *offset = -1; |
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1703 return false; |
0 | 1704 } |
1705 | |
1706 struct _address_to_library_name { | |
1707 address addr; // input : memory address | |
1708 size_t buflen; // size of fname | |
1709 char* fname; // output: library name | |
1710 address base; // library base addr | |
1711 }; | |
1712 | |
1713 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1714 size_t size, void *data) { | |
1715 int i; | |
1716 bool found = false; | |
1717 address libbase = NULL; | |
1718 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1719 | |
1720 // iterate through all loadable segments | |
1721 for (i = 0; i < info->dlpi_phnum; i++) { | |
1722 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1723 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1724 // base address of a library is the lowest address of its loaded | |
1725 // segments. | |
1726 if (libbase == NULL || libbase > segbase) { | |
1727 libbase = segbase; | |
1728 } | |
1729 // see if 'addr' is within current segment | |
1730 if (segbase <= d->addr && | |
1731 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1732 found = true; | |
1733 } | |
1734 } | |
1735 } | |
1736 | |
1737 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1738 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1739 // can figure out executable name from argv[0]. | |
1740 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1741 d->base = libbase; | |
1742 if (d->fname) { | |
1743 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1744 } | |
1745 return 1; | |
1746 } | |
1747 return 0; | |
1748 } | |
1749 | |
1750 bool os::dll_address_to_library_name(address addr, char* buf, | |
1751 int buflen, int* offset) { | |
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1752 // buf is not optional, but offset is optional |
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1753 assert(buf != NULL, "sanity check"); |
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1754 |
0 | 1755 Dl_info dlinfo; |
1756 struct _address_to_library_name data; | |
1757 | |
1758 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1759 // to wrong library name if the .so file has a base address != NULL. Here | |
1760 // we iterate through the program headers of all loaded libraries to find | |
1761 // out which library 'addr' really belongs to. This workaround can be | |
1762 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1763 data.addr = addr; | |
1764 data.fname = buf; | |
1765 data.buflen = buflen; | |
1766 data.base = NULL; | |
1767 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1768 | |
1769 if (rslt) { | |
1770 // buf already contains library name | |
1771 if (offset) *offset = addr - data.base; | |
1772 return true; | |
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1773 } |
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1774 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1775 if (dlinfo.dli_fname != NULL) { |
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1776 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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1777 } |
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1778 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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1779 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1780 } |
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1781 return true; |
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|
1782 } |
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|
1783 |
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|
1784 buf[0] = '\0'; |
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1785 if (offset) *offset = -1; |
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1786 return false; |
0 | 1787 } |
1788 | |
1789 // Loads .dll/.so and | |
1790 // in case of error it checks if .dll/.so was built for the | |
1791 // same architecture as Hotspot is running on | |
1792 | |
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1793 |
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1794 // Remember the stack's state. The Linux dynamic linker will change |
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1795 // the stack to 'executable' at most once, so we must safepoint only once. |
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1796 bool os::Linux::_stack_is_executable = false; |
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1797 |
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1798 // VM operation that loads a library. This is necessary if stack protection |
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1799 // of the Java stacks can be lost during loading the library. If we |
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1800 // do not stop the Java threads, they can stack overflow before the stacks |
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1801 // are protected again. |
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1802 class VM_LinuxDllLoad: public VM_Operation { |
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1803 private: |
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1804 const char *_filename; |
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1805 char *_ebuf; |
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1806 int _ebuflen; |
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1807 void *_lib; |
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1808 public: |
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1809 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1810 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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1811 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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1812 void doit() { |
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1813 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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1814 os::Linux::_stack_is_executable = true; |
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1815 } |
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1816 void* loaded_library() { return _lib; } |
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1817 }; |
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1818 |
0 | 1819 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1820 { | |
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1821 void * result = NULL; |
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1822 bool load_attempted = false; |
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1823 |
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1824 // Check whether the library to load might change execution rights |
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1825 // of the stack. If they are changed, the protection of the stack |
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1826 // guard pages will be lost. We need a safepoint to fix this. |
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1827 // |
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1828 // See Linux man page execstack(8) for more info. |
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1829 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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1830 ElfFile ef(filename); |
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1831 if (!ef.specifies_noexecstack()) { |
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1832 if (!is_init_completed()) { |
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1833 os::Linux::_stack_is_executable = true; |
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1834 // This is OK - No Java threads have been created yet, and hence no |
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1835 // stack guard pages to fix. |
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1836 // |
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1837 // This should happen only when you are building JDK7 using a very |
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1838 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1839 // |
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1840 // Dynamic loader will make all stacks executable after |
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1841 // this function returns, and will not do that again. |
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1842 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1843 } else { |
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1844 warning("You have loaded library %s which might have disabled stack guard. " |
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1845 "The VM will try to fix the stack guard now.\n" |
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1846 "It's highly recommended that you fix the library with " |
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1847 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1848 filename); |
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1849 |
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1850 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1851 JavaThread *jt = JavaThread::current(); |
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1852 if (jt->thread_state() != _thread_in_native) { |
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1853 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1854 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1855 warning("Unable to fix stack guard. Giving up."); |
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1856 } else { |
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1857 if (!LoadExecStackDllInVMThread) { |
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1858 // This is for the case where the DLL has an static |
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1859 // constructor function that executes JNI code. We cannot |
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1860 // load such DLLs in the VMThread. |
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1861 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1862 } |
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1863 |
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1864 ThreadInVMfromNative tiv(jt); |
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1865 debug_only(VMNativeEntryWrapper vew;) |
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1866 |
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1867 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1868 VMThread::execute(&op); |
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1869 if (LoadExecStackDllInVMThread) { |
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1870 result = op.loaded_library(); |
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1871 } |
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1872 load_attempted = true; |
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1873 } |
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1874 } |
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1875 } |
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1876 } |
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1877 |
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1878 if (!load_attempted) { |
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1879 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1880 } |
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1881 |
0 | 1882 if (result != NULL) { |
1883 // Successful loading | |
1884 return result; | |
1885 } | |
1886 | |
1887 Elf32_Ehdr elf_head; | |
1888 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1889 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1890 | |
1891 if (diag_msg_max_length==0) { | |
1892 // No more space in ebuf for additional diagnostics message | |
1893 return NULL; | |
1894 } | |
1895 | |
1896 | |
1897 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1898 | |
1899 if (file_descriptor < 0) { | |
1900 // Can't open library, report dlerror() message | |
1901 return NULL; | |
1902 } | |
1903 | |
1904 bool failed_to_read_elf_head= | |
1905 (sizeof(elf_head)!= | |
1906 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1907 | |
1908 ::close(file_descriptor); | |
1909 if (failed_to_read_elf_head) { | |
1910 // file i/o error - report dlerror() msg | |
1911 return NULL; | |
1912 } | |
1913 | |
1914 typedef struct { | |
1915 Elf32_Half code; // Actual value as defined in elf.h | |
1916 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1917 char elf_class; // 32 or 64 bit | |
1918 char endianess; // MSB or LSB | |
1919 char* name; // String representation | |
1920 } arch_t; | |
1921 | |
1922 #ifndef EM_486 | |
1923 #define EM_486 6 /* Intel 80486 */ | |
1924 #endif | |
1925 | |
1926 static const arch_t arch_array[]={ | |
1927 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1928 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1929 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1930 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1931 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1932 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1933 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1934 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
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1935 #if defined(VM_LITTLE_ENDIAN) |
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1936 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2LSB, (char*)"Power PC 64"}, |
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1937 #else |
1010 | 1938 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
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1939 #endif |
1010 | 1940 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, |
1941 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1942 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1943 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1944 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1945 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1946 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1947 }; |
1948 | |
1949 #if (defined IA32) | |
1950 static Elf32_Half running_arch_code=EM_386; | |
1951 #elif (defined AMD64) | |
1952 static Elf32_Half running_arch_code=EM_X86_64; | |
1953 #elif (defined IA64) | |
1954 static Elf32_Half running_arch_code=EM_IA_64; | |
1955 #elif (defined __sparc) && (defined _LP64) | |
1956 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1957 #elif (defined __sparc) && (!defined _LP64) | |
1958 static Elf32_Half running_arch_code=EM_SPARC; | |
1959 #elif (defined __powerpc64__) | |
1960 static Elf32_Half running_arch_code=EM_PPC64; | |
1961 #elif (defined __powerpc__) | |
1962 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1963 #elif (defined ARM) |
1964 static Elf32_Half running_arch_code=EM_ARM; | |
1965 #elif (defined S390) | |
1966 static Elf32_Half running_arch_code=EM_S390; | |
1967 #elif (defined ALPHA) | |
1968 static Elf32_Half running_arch_code=EM_ALPHA; | |
1969 #elif (defined MIPSEL) | |
1970 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1971 #elif (defined PARISC) | |
1972 static Elf32_Half running_arch_code=EM_PARISC; | |
1973 #elif (defined MIPS) | |
1974 static Elf32_Half running_arch_code=EM_MIPS; | |
1975 #elif (defined M68K) | |
1976 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1977 #else |
1978 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1979 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 1980 #endif |
1981 | |
1982 // Identify compatability class for VM's architecture and library's architecture | |
1983 // Obtain string descriptions for architectures | |
1984 | |
1985 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1986 int running_arch_index=-1; | |
1987 | |
1988 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1989 if (running_arch_code == arch_array[i].code) { | |
1990 running_arch_index = i; | |
1991 } | |
1992 if (lib_arch.code == arch_array[i].code) { | |
1993 lib_arch.compat_class = arch_array[i].compat_class; | |
1994 lib_arch.name = arch_array[i].name; | |
1995 } | |
1996 } | |
1997 | |
1998 assert(running_arch_index != -1, | |
1999 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
2000 if (running_arch_index == -1) { | |
2001 // Even though running architecture detection failed | |
2002 // we may still continue with reporting dlerror() message | |
2003 return NULL; | |
2004 } | |
2005 | |
2006 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
2007 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
2008 return NULL; | |
2009 } | |
2010 | |
1010 | 2011 #ifndef S390 |
0 | 2012 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
2013 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
2014 return NULL; | |
2015 } | |
1010 | 2016 #endif // !S390 |
0 | 2017 |
2018 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
2019 if ( lib_arch.name!=NULL ) { | |
2020 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2021 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
2022 lib_arch.name, arch_array[running_arch_index].name); | |
2023 } else { | |
2024 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2025 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
2026 lib_arch.code, | |
2027 arch_array[running_arch_index].name); | |
2028 } | |
2029 } | |
2030 | |
2031 return NULL; | |
2032 } | |
2033 | |
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2034 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2035 void * result = ::dlopen(filename, RTLD_LAZY); |
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2036 if (result == NULL) { |
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2037 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2038 ebuf[ebuflen-1] = '\0'; |
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2039 } |
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2040 return result; |
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2041 } |
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2042 |
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2043 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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2044 void * result = NULL; |
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2045 if (LoadExecStackDllInVMThread) { |
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2046 result = dlopen_helper(filename, ebuf, ebuflen); |
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2047 } |
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2048 |
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2049 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2050 // library that requires an executable stack, or which does not have this |
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2051 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2052 // read protection of the guard pages gets lost. |
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2053 // |
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2054 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2055 // may have been queued at the same time. |
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2056 |
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2057 if (!_stack_is_executable) { |
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2058 JavaThread *jt = Threads::first(); |
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2059 |
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2060 while (jt) { |
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2061 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2062 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2063 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2064 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2065 warning("Attempt to reguard stack yellow zone failed."); |
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2066 } |
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2067 } |
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2068 jt = jt->next(); |
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2069 } |
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2070 } |
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2071 |
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2072 return result; |
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2073 } |
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2074 |
242 | 2075 /* |
2076 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2077 * chances are you might want to run the generated bits against glibc-2.0 | |
2078 * libdl.so, so always use locking for any version of glibc. | |
2079 */ | |
2080 void* os::dll_lookup(void* handle, const char* name) { | |
2081 pthread_mutex_lock(&dl_mutex); | |
2082 void* res = dlsym(handle, name); | |
2083 pthread_mutex_unlock(&dl_mutex); | |
2084 return res; | |
2085 } | |
0 | 2086 |
17684
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2087 void* os::get_default_process_handle() { |
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2088 return (void*)::dlopen(NULL, RTLD_LAZY); |
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2089 } |
0 | 2090 |
1980
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2091 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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2092 int fd = ::open(filename, O_RDONLY); |
0 | 2093 if (fd == -1) { |
2094 return false; | |
2095 } | |
2096 | |
2097 char buf[32]; | |
2098 int bytes; | |
1980
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2099 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2100 st->print_raw(buf, bytes); |
2101 } | |
2102 | |
1980
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2103 ::close(fd); |
0 | 2104 |
2105 return true; | |
2106 } | |
2107 | |
2108 void os::print_dll_info(outputStream *st) { | |
2109 st->print_cr("Dynamic libraries:"); | |
2110 | |
2111 char fname[32]; | |
2112 pid_t pid = os::Linux::gettid(); | |
2113 | |
2114 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2115 | |
2116 if (!_print_ascii_file(fname, st)) { | |
2117 st->print("Can not get library information for pid = %d\n", pid); | |
2118 } | |
2119 } | |
2120 | |
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2121 void os::print_os_info_brief(outputStream* st) { |
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2122 os::Linux::print_distro_info(st); |
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2123 |
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2124 os::Posix::print_uname_info(st); |
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2125 |
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2126 os::Linux::print_libversion_info(st); |
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2127 |
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2128 } |
0 | 2129 |
2130 void os::print_os_info(outputStream* st) { | |
2131 st->print("OS:"); | |
2132 | |
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2133 os::Linux::print_distro_info(st); |
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2134 |
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2135 os::Posix::print_uname_info(st); |
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2136 |
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2137 // Print warning if unsafe chroot environment detected |
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2138 if (unsafe_chroot_detected) { |
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2139 st->print("WARNING!! "); |
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2140 st->print_cr("%s", unstable_chroot_error); |
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2141 } |
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2142 |
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2143 os::Linux::print_libversion_info(st); |
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2144 |
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|
2145 os::Posix::print_rlimit_info(st); |
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7165755: OS Information much longer on linux than other platforms
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|
2146 |
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|
2147 os::Posix::print_load_average(st); |
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|
2148 |
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|
2149 os::Linux::print_full_memory_info(st); |
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|
2150 } |
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|
2151 |
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|
2152 // Try to identify popular distros. |
12212
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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diff
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|
2153 // Most Linux distributions have a /etc/XXX-release file, which contains |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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diff
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|
2154 // the OS version string. Newer Linux distributions have a /etc/lsb-release |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2155 // file that also contains the OS version string. Some have more than one |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
diff
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|
2156 // /etc/XXX-release file (e.g. Mandrake has both /etc/mandrake-release and |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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diff
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|
2157 // /etc/redhat-release.), so the order is important. |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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diff
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|
2158 // Any Linux that is based on Redhat (i.e. Oracle, Mandrake, Sun JDS...) have |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2159 // their own specific XXX-release file as well as a redhat-release file. |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2160 // Because of this the XXX-release file needs to be searched for before the |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2161 // redhat-release file. |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2162 // Since Red Hat has a lsb-release file that is not very descriptive the |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2163 // 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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|
2164 // Since the lsb-release file is the new standard it needs to be searched |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2165 // before the older style release files. |
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|
2166 // 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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|
2167 // 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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|
2168 // 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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|
2169 // 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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|
2170 // 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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|
2171 // 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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|
2172 // "Debian " is printed before the contents of the debian_version file. |
6080
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|
2173 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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|
2174 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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|
2175 !_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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|
2176 !_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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|
2177 !_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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|
2178 !_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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|
2179 !_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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|
2180 !_print_ascii_file("/etc/SuSE-release", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2181 !_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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|
2182 !_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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|
2183 !_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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|
2184 !_print_ascii_file("/etc/angstrom-version", st) && |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2185 !_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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|
2186 !_print_ascii_file("/etc/os-release", st)) { |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2187 |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2188 if (file_exists("/etc/debian_version")) { |
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6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2189 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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|
2190 _print_ascii_file("/etc/debian_version", st); |
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|
2191 } else { |
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|
2192 st->print("Linux"); |
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|
2193 } |
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|
2194 } |
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|
2195 st->cr(); |
6080
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|
2196 } |
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|
2197 |
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|
2198 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2199 // libc, pthread |
2200 st->print("libc:"); | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
2201 st->print("%s ", os::Linux::glibc_version()); |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
2202 st->print("%s ", os::Linux::libpthread_version()); |
0 | 2203 if (os::Linux::is_LinuxThreads()) { |
2204 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2205 } | |
2206 st->cr(); | |
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|
2207 } |
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|
2208 |
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|
2209 void os::Linux::print_full_memory_info(outputStream* st) { |
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|
2210 st->print("\n/proc/meminfo:\n"); |
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|
2211 _print_ascii_file("/proc/meminfo", st); |
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|
2212 st->cr(); |
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
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3358
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|
2213 } |
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|
2214 |
0 | 2215 void os::print_memory_info(outputStream* st) { |
2216 | |
2217 st->print("Memory:"); | |
2218 st->print(" %dk page", os::vm_page_size()>>10); | |
2219 | |
2220 // values in struct sysinfo are "unsigned long" | |
2221 struct sysinfo si; | |
2222 sysinfo(&si); | |
2223 | |
2224 st->print(", physical " UINT64_FORMAT "k", | |
2225 os::physical_memory() >> 10); | |
2226 st->print("(" UINT64_FORMAT "k free)", | |
2227 os::available_memory() >> 10); | |
2228 st->print(", swap " UINT64_FORMAT "k", | |
2229 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2230 st->print("(" UINT64_FORMAT "k free)", | |
2231 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2232 st->cr(); | |
2233 } | |
2234 | |
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|
2235 void os::pd_print_cpu_info(outputStream* st) { |
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|
2236 st->print("\n/proc/cpuinfo:\n"); |
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|
2237 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
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|
2238 st->print(" <Not Available>"); |
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diff
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|
2239 } |
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|
2240 st->cr(); |
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|
2241 } |
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|
2242 |
0 | 2243 void os::print_siginfo(outputStream* st, void* siginfo) { |
14410 | 2244 const siginfo_t* si = (const siginfo_t*)siginfo; |
2245 | |
2246 os::Posix::print_siginfo_brief(st, si); | |
20375
6e0cb14ce59b
8046070: Class Data Sharing clean up and refactoring
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20360
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|
2247 #if INCLUDE_CDS |
14410 | 2248 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && |
0 | 2249 UseSharedSpaces) { |
2250 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2251 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2252 st->print("\n\nError accessing class data sharing archive." \ | |
2253 " Mapped file inaccessible during execution, " \ | |
2254 " possible disk/network problem."); | |
2255 } | |
2256 } | |
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20360
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|
2257 #endif |
0 | 2258 st->cr(); |
2259 } | |
2260 | |
2261 | |
2262 static void print_signal_handler(outputStream* st, int sig, | |
2263 char* buf, size_t buflen); | |
2264 | |
2265 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2266 st->print_cr("Signal Handlers:"); | |
2267 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2268 print_signal_handler(st, SIGBUS , buf, buflen); | |
2269 print_signal_handler(st, SIGFPE , buf, buflen); | |
2270 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2271 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2272 print_signal_handler(st, SIGILL , buf, buflen); | |
2273 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2274 print_signal_handler(st, SR_signum, buf, buflen); | |
2275 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2276 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2277 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2278 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
14432
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
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14422
diff
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|
2279 #if defined(PPC64) |
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diff
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|
2280 print_signal_handler(st, SIGTRAP, buf, buflen); |
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diff
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|
2281 #endif |
0 | 2282 } |
2283 | |
2284 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2285 | |
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7d42f3b08300
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|
2286 // Find the full path to the current module, libjvm.so |
1642 | 2287 void os::jvm_path(char *buf, jint buflen) { |
0 | 2288 // Error checking. |
1642 | 2289 if (buflen < MAXPATHLEN) { |
0 | 2290 assert(false, "must use a large-enough buffer"); |
2291 buf[0] = '\0'; | |
2292 return; | |
2293 } | |
2294 // Lazy resolve the path to current module. | |
2295 if (saved_jvm_path[0] != 0) { | |
2296 strcpy(buf, saved_jvm_path); | |
2297 return; | |
2298 } | |
2299 | |
2300 char dli_fname[MAXPATHLEN]; | |
2301 bool ret = dll_address_to_library_name( | |
2302 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2303 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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|
2304 assert(ret, "cannot locate libjvm"); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
2305 char *rp = NULL; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
2306 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
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|
2307 rp = realpath(dli_fname, buf); |
59b052799158
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10986
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|
2308 } |
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126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1642
diff
changeset
|
2309 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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|
2310 return; |
0 | 2311 |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
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2204
diff
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|
2312 if (Arguments::created_by_gamma_launcher()) { |
0 | 2313 // Support for the gamma launcher. Typical value for buf is |
2314 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2315 // the right place in the string, then assume we are installed in a JDK and | |
2316 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2317 // up the path so it looks like libjvm.so is installed there (append a | |
2318 // fake suffix hotspot/libjvm.so). | |
2319 const char *p = buf + strlen(buf) - 1; | |
2320 for (int count = 0; p > buf && count < 5; ++count) { | |
2321 for (--p; p > buf && *p != '/'; --p) | |
2322 /* empty */ ; | |
2323 } | |
2324 | |
2325 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2326 // Look for JAVA_HOME in the environment. | |
2327 char* java_home_var = ::getenv("JAVA_HOME"); | |
2328 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2329 char* jrelib_p; |
2330 int len; | |
2331 | |
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7d42f3b08300
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7206
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|
2332 // Check the current module name "libjvm.so". |
0 | 2333 p = strrchr(buf, '/'); |
2334 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2335 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
1642
diff
changeset
|
2336 rp = realpath(java_home_var, buf); |
126ea7725993
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1642
diff
changeset
|
2337 if (rp == NULL) |
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2328d1d3f8cf
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diff
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|
2338 return; |
1642 | 2339 |
2340 // determine if this is a legacy image or modules image | |
2341 // modules image doesn't have "jre" subdirectory | |
2342 len = strlen(buf); | |
17567 | 2343 assert(len < buflen, "Ran out of buffer room"); |
1642 | 2344 jrelib_p = buf + len; |
2345 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2346 if (0 != access(buf, F_OK)) { | |
2347 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2348 } | |
2349 | |
0 | 2350 if (0 == access(buf, F_OK)) { |
7456
7d42f3b08300
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dcubed
parents:
7206
diff
changeset
|
2351 // Use current module name "libjvm.so" |
1642 | 2352 len = strlen(buf); |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2353 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2354 } else { |
2355 // Go back to path of .so | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2356 rp = realpath(dli_fname, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2357 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2358 return; |
0 | 2359 } |
2360 } | |
2361 } | |
2362 } | |
2363 | |
17567 | 2364 strncpy(saved_jvm_path, buf, MAXPATHLEN); |
0 | 2365 } |
2366 | |
2367 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2368 // no prefix required, not even "_" | |
2369 } | |
2370 | |
2371 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2372 // no suffix required | |
2373 } | |
2374 | |
2375 //////////////////////////////////////////////////////////////////////////////// | |
2376 // sun.misc.Signal support | |
2377 | |
2378 static volatile jint sigint_count = 0; | |
2379 | |
2380 static void | |
2381 UserHandler(int sig, void *siginfo, void *context) { | |
2382 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2383 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2384 // don't want to flood the manager thread with sem_post requests. | |
2385 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2386 return; | |
2387 | |
2388 // Ctrl-C is pressed during error reporting, likely because the error | |
2389 // handler fails to abort. Let VM die immediately. | |
2390 if (sig == SIGINT && is_error_reported()) { | |
2391 os::die(); | |
2392 } | |
2393 | |
2394 os::signal_notify(sig); | |
2395 } | |
2396 | |
2397 void* os::user_handler() { | |
2398 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2399 } | |
2400 | |
10405 | 2401 class Semaphore : public StackObj { |
2402 public: | |
2403 Semaphore(); | |
2404 ~Semaphore(); | |
2405 void signal(); | |
2406 void wait(); | |
2407 bool trywait(); | |
2408 bool timedwait(unsigned int sec, int nsec); | |
2409 private: | |
2410 sem_t _semaphore; | |
2411 }; | |
2412 | |
2413 Semaphore::Semaphore() { | |
2414 sem_init(&_semaphore, 0, 0); | |
2415 } | |
2416 | |
2417 Semaphore::~Semaphore() { | |
2418 sem_destroy(&_semaphore); | |
2419 } | |
2420 | |
2421 void Semaphore::signal() { | |
2422 sem_post(&_semaphore); | |
2423 } | |
2424 | |
2425 void Semaphore::wait() { | |
2426 sem_wait(&_semaphore); | |
2427 } | |
2428 | |
2429 bool Semaphore::trywait() { | |
2430 return sem_trywait(&_semaphore) == 0; | |
2431 } | |
2432 | |
2433 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
17738 | 2434 |
10405 | 2435 struct timespec ts; |
17738 | 2436 // Semaphore's are always associated with CLOCK_REALTIME |
2437 os::Linux::clock_gettime(CLOCK_REALTIME, &ts); | |
2438 // see unpackTime for discussion on overflow checking | |
2439 if (sec >= MAX_SECS) { | |
2440 ts.tv_sec += MAX_SECS; | |
2441 ts.tv_nsec = 0; | |
2442 } else { | |
2443 ts.tv_sec += sec; | |
2444 ts.tv_nsec += nsec; | |
2445 if (ts.tv_nsec >= NANOSECS_PER_SEC) { | |
2446 ts.tv_nsec -= NANOSECS_PER_SEC; | |
2447 ++ts.tv_sec; // note: this must be <= max_secs | |
2448 } | |
2449 } | |
10405 | 2450 |
2451 while (1) { | |
2452 int result = sem_timedwait(&_semaphore, &ts); | |
2453 if (result == 0) { | |
2454 return true; | |
2455 } else if (errno == EINTR) { | |
2456 continue; | |
2457 } else if (errno == ETIMEDOUT) { | |
2458 return false; | |
2459 } else { | |
2460 return false; | |
2461 } | |
2462 } | |
2463 } | |
2464 | |
0 | 2465 extern "C" { |
2466 typedef void (*sa_handler_t)(int); | |
2467 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2468 } | |
2469 | |
2470 void* os::signal(int signal_number, void* handler) { | |
2471 struct sigaction sigAct, oldSigAct; | |
2472 | |
2473 sigfillset(&(sigAct.sa_mask)); | |
2474 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2475 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2476 | |
2477 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2478 // -1 means registration failed | |
2479 return (void *)-1; | |
2480 } | |
2481 | |
2482 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2483 } | |
2484 | |
2485 void os::signal_raise(int signal_number) { | |
2486 ::raise(signal_number); | |
2487 } | |
2488 | |
2489 /* | |
2490 * The following code is moved from os.cpp for making this | |
2491 * code platform specific, which it is by its very nature. | |
2492 */ | |
2493 | |
2494 // Will be modified when max signal is changed to be dynamic | |
2495 int os::sigexitnum_pd() { | |
2496 return NSIG; | |
2497 } | |
2498 | |
2499 // a counter for each possible signal value | |
2500 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2501 | |
2502 // Linux(POSIX) specific hand shaking semaphore. | |
2503 static sem_t sig_sem; | |
10405 | 2504 static Semaphore sr_semaphore; |
0 | 2505 |
2506 void os::signal_init_pd() { | |
2507 // Initialize signal structures | |
2508 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2509 | |
2510 // Initialize signal semaphore | |
2511 ::sem_init(&sig_sem, 0, 0); | |
2512 } | |
2513 | |
2514 void os::signal_notify(int sig) { | |
2515 Atomic::inc(&pending_signals[sig]); | |
2516 ::sem_post(&sig_sem); | |
2517 } | |
2518 | |
2519 static int check_pending_signals(bool wait) { | |
2520 Atomic::store(0, &sigint_count); | |
2521 for (;;) { | |
2522 for (int i = 0; i < NSIG + 1; i++) { | |
2523 jint n = pending_signals[i]; | |
2524 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2525 return i; | |
2526 } | |
2527 } | |
2528 if (!wait) { | |
2529 return -1; | |
2530 } | |
2531 JavaThread *thread = JavaThread::current(); | |
2532 ThreadBlockInVM tbivm(thread); | |
2533 | |
2534 bool threadIsSuspended; | |
2535 do { | |
2536 thread->set_suspend_equivalent(); | |
2537 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2538 ::sem_wait(&sig_sem); | |
2539 | |
2540 // were we externally suspended while we were waiting? | |
2541 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2542 if (threadIsSuspended) { | |
2543 // | |
2544 // The semaphore has been incremented, but while we were waiting | |
2545 // another thread suspended us. We don't want to continue running | |
2546 // while suspended because that would surprise the thread that | |
2547 // suspended us. | |
2548 // | |
2549 ::sem_post(&sig_sem); | |
2550 | |
2551 thread->java_suspend_self(); | |
2552 } | |
2553 } while (threadIsSuspended); | |
2554 } | |
2555 } | |
2556 | |
2557 int os::signal_lookup() { | |
2558 return check_pending_signals(false); | |
2559 } | |
2560 | |
2561 int os::signal_wait() { | |
2562 return check_pending_signals(true); | |
2563 } | |
2564 | |
2565 //////////////////////////////////////////////////////////////////////////////// | |
2566 // Virtual Memory | |
2567 | |
2568 int os::vm_page_size() { | |
2569 // Seems redundant as all get out | |
2570 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2571 return os::Linux::page_size(); | |
2572 } | |
2573 | |
2574 // Solaris allocates memory by pages. | |
2575 int os::vm_allocation_granularity() { | |
2576 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2577 return os::Linux::page_size(); | |
2578 } | |
2579 | |
2580 // Rationale behind this function: | |
2581 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2582 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2583 // samples for JITted code. Here we create private executable mapping over the code cache | |
2584 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2585 // info for the reporting script by storing timestamp and location of symbol | |
2586 void linux_wrap_code(char* base, size_t size) { | |
2587 static volatile jint cnt = 0; | |
2588 | |
2589 if (!UseOprofile) { | |
2590 return; | |
2591 } | |
2592 | |
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
coleenp
parents:
1353
diff
changeset
|
2593 char buf[PATH_MAX+1]; |
0 | 2594 int num = Atomic::add(1, &cnt); |
2595 | |
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2596 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2597 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2598 unlink(buf); |
2599 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2600 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2601 |
2602 if (fd != -1) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2603 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2604 if (rv != (off_t)-1) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2605 if (::write(fd, "", 1) == 1) { |
0 | 2606 mmap(base, size, |
2607 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2608 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2609 } | |
2610 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2611 ::close(fd); |
0 | 2612 unlink(buf); |
2613 } | |
2614 } | |
2615 | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2616 static bool recoverable_mmap_error(int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2617 // See if the error is one we can let the caller handle. This |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2618 // list of errno values comes from JBS-6843484. I can't find a |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2619 // Linux man page that documents this specific set of errno |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2620 // values so while this list currently matches Solaris, it may |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2621 // change as we gain experience with this failure mode. |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
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diff
changeset
|
2622 switch (err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2623 case EBADF: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2624 case EINVAL: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2625 case ENOTSUP: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2626 // let the caller deal with these errors |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
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diff
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|
2627 return true; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2628 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2629 default: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2630 // 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
dcubed
parents:
10405
diff
changeset
|
2631 // to be lost. That can cause confusion where different data |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2632 // structures think they have the same memory mapped. The worst |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2633 // 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
dcubed
parents:
10405
diff
changeset
|
2634 // same memory mapped. |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2635 return false; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2636 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2637 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2638 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2639 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
dcubed
parents:
10405
diff
changeset
|
2640 int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2641 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2642 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2643 strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2644 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2645 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2646 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
dcubed
parents:
10405
diff
changeset
|
2647 size_t alignment_hint, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2648 int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2649 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2650 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2651 alignment_hint, exec, strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
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diff
changeset
|
2652 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2653 |
0 | 2654 // NOTE: Linux kernel does not really reserve the pages for us. |
2655 // All it does is to check if there are enough free pages | |
2656 // left at the time of mmap(). This could be a potential | |
2657 // problem. | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2658 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
656 | 2659 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2660 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2661 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2662 if (res != (uintptr_t) MAP_FAILED) { |
2663 if (UseNUMAInterleaving) { | |
2664 numa_make_global(addr, size); | |
2665 } | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2666 return 0; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2667 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2668 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2669 int err = errno; // save errno from mmap() call above |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2670 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2671 if (!recoverable_mmap_error(err)) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2672 warn_fail_commit_memory(addr, size, exec, err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2673 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2674 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2675 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2676 return err; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2677 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2678 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2679 bool os::pd_commit_memory(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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|
2680 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2681 } |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2682 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2683 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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|
2684 const char* mesg) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2685 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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|
2686 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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|
2687 if (err != 0) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2688 // the caller wants all commit errors to exit with the specified mesg: |
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|
2689 warn_fail_commit_memory(addr, size, exec, err); |
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|
2690 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2691 } |
0 | 2692 } |
2693 | |
3286
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|
2694 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
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|
2695 #ifndef MAP_HUGETLB |
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7034464: Support transparent large pages on Linux
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|
2696 #define MAP_HUGETLB 0x40000 |
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|
2697 #endif |
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|
2698 |
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|
2699 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
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|
2700 #ifndef MADV_HUGEPAGE |
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|
2701 #define MADV_HUGEPAGE 14 |
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7034464: Support transparent large pages on Linux
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|
2702 #endif |
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|
2703 |
10969
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|
2704 int os::Linux::commit_memory_impl(char* addr, size_t size, |
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|
2705 size_t alignment_hint, bool exec) { |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
2706 int err = os::Linux::commit_memory_impl(addr, size, exec); |
10969
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|
2707 if (err == 0) { |
3913
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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|
2708 realign_memory(addr, size, alignment_hint); |
10969
a837fa3d3f86
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|
2709 } |
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|
2710 return err; |
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|
2711 } |
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|
2712 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2713 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2714 bool exec) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2715 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
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|
2716 } |
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|
2717 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2718 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2719 size_t alignment_hint, bool exec, |
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|
2720 const char* mesg) { |
a837fa3d3f86
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|
2721 assert(mesg != NULL, "mesg must be specified"); |
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|
2722 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2723 if (err != 0) { |
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|
2724 // the caller wants all commit errors to exit with the specified mesg: |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2725 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2726 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2727 } |
0 | 2728 } |
2729 | |
6197 | 2730 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
12110
4c84d351cca9
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|
2731 if (UseTransparentHugePages && alignment_hint > (size_t)vm_page_size()) { |
3286
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|
2732 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2733 // be supported or the memory may already be backed by huge pages. |
139667d9836a
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|
2734 ::madvise(addr, bytes, MADV_HUGEPAGE); |
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|
2735 } |
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|
2736 } |
141 | 2737 |
6197 | 2738 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
5937
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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5909
diff
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|
2739 // This method works by doing an mmap over an existing mmaping and effectively discarding |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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5909
diff
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|
2740 // the existing pages. However it won't work for SHM-based large pages that cannot be |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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5909
diff
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|
2741 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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5909
diff
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|
2742 // small pages on top of the SHM segment. This method always works for small pages, so we |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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5909
diff
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|
2743 // allow that in any case. |
12110
4c84d351cca9
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|
2744 if (alignment_hint <= (size_t)os::vm_page_size() || can_commit_large_page_memory()) { |
10969
a837fa3d3f86
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|
2745 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
5937
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diff
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|
2746 } |
141 | 2747 } |
2748 | |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
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|
2749 void os::numa_make_global(char *addr, size_t bytes) { |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2750 Linux::numa_interleave_memory(addr, bytes); |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2751 } |
141 | 2752 |
12176
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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11092
diff
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|
2753 // Define for numa_set_bind_policy(int). Setting the argument to 0 will set the |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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diff
changeset
|
2754 // bind policy to MPOL_PREFERRED for the current thread. |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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diff
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|
2755 #define USE_MPOL_PREFERRED 0 |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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diff
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|
2756 |
141 | 2757 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
12176
88c255656030
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diff
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|
2758 // To make NUMA and large pages more robust when both enabled, we need to ease |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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diff
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|
2759 // the requirements on where the memory should be allocated. MPOL_BIND is the |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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|
2760 // default policy and it will force memory to be allocated on the specified |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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diff
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|
2761 // node. Changing this to MPOL_PREFERRED will prefer to allocate the memory on |
88c255656030
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|
2762 // the specified node, but will not force it. Using this policy will prevent |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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11092
diff
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|
2763 // getting SIGBUS when trying to allocate large pages on NUMA nodes with no |
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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11092
diff
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|
2764 // free large pages. |
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|
2765 Linux::numa_set_bind_policy(USE_MPOL_PREFERRED); |
141 | 2766 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); |
2767 } | |
2768 | |
2769 bool os::numa_topology_changed() { return false; } | |
2770 | |
2771 size_t os::numa_get_groups_num() { | |
2772 int max_node = Linux::numa_max_node(); | |
2773 return max_node > 0 ? max_node + 1 : 1; | |
2774 } | |
2775 | |
2776 int os::numa_get_group_id() { | |
2777 int cpu_id = Linux::sched_getcpu(); | |
2778 if (cpu_id != -1) { | |
2779 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2780 if (lgrp_id != -1) { | |
2781 return lgrp_id; | |
2782 } | |
0 | 2783 } |
2784 return 0; | |
2785 } | |
2786 | |
141 | 2787 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2788 for (size_t i = 0; i < size; i++) { | |
2789 ids[i] = i; | |
2790 } | |
2791 return size; | |
2792 } | |
2793 | |
0 | 2794 bool os::get_page_info(char *start, page_info* info) { |
2795 return false; | |
2796 } | |
2797 | |
2798 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2799 return end; | |
2800 } | |
2801 | |
3826 | 2802 |
2803 int os::Linux::sched_getcpu_syscall(void) { | |
2804 unsigned int cpu; | |
2805 int retval = -1; | |
2806 | |
2807 #if defined(IA32) | |
3887
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|
2808 # ifndef SYS_getcpu |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2809 # define SYS_getcpu 318 |
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|
2810 # endif |
3826 | 2811 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2812 #elif defined(AMD64) | |
3887
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7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2813 // Unfortunately we have to bring all these macros here from vsyscall.h |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2814 // to be able to compile on old linuxes. |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2815 # define __NR_vgetcpu 2 |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2816 # define VSYSCALL_START (-10UL << 20) |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2817 # define VSYSCALL_SIZE 1024 |
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7082645: Hotspot doesn't compile on old linuxes after 7060836
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|
2818 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2819 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2820 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2821 retval = vgetcpu(&cpu, NULL, NULL); | |
2822 #endif | |
2823 | |
2824 return (retval == -1) ? retval : cpu; | |
2825 } | |
2826 | |
2191 | 2827 // Something to do with the numa-aware allocator needs these symbols |
2828 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2829 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2830 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2831 |
763
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6840196: NUMA allocator: crash in fastdebug during startup on Linux
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|
2832 |
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6840196: NUMA allocator: crash in fastdebug during startup on Linux
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|
2833 // If we are running with libnuma version > 2, then we should |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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diff
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|
2834 // be trying to use symbols with versions 1.1 |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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diff
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|
2835 // If we are running with earlier version, which did not have symbol versions, |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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diff
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|
2836 // we should use the base version. |
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2837 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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2838 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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2839 if (f == NULL) { |
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2840 f = dlsym(handle, name); |
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|
2841 } |
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|
2842 return f; |
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|
2843 } |
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2844 |
462
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2845 bool os::Linux::libnuma_init() { |
141 | 2846 // sched_getcpu() should be in libc. |
2847 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2848 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2849 | |
3826 | 2850 // If it's not, try a direct syscall. |
2851 if (sched_getcpu() == -1) | |
2852 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2853 | |
141 | 2854 if (sched_getcpu() != -1) { // Does it work? |
267
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|
2855 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2856 if (handle != NULL) { |
2857 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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|
2858 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2859 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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|
2860 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2861 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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|
2862 libnuma_dlsym(handle, "numa_available"))); |
141 | 2863 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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|
2864 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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2865 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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|
2866 libnuma_dlsym(handle, "numa_interleave_memory"))); |
12176
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|
2867 set_numa_set_bind_policy(CAST_TO_FN_PTR(numa_set_bind_policy_func_t, |
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|
2868 libnuma_dlsym(handle, "numa_set_bind_policy"))); |
462
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2869 |
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2870 |
141 | 2871 if (numa_available() != -1) { |
763
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2872 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2873 // Create a cpu -> node mapping |
6197 | 2874 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2875 rebuild_cpu_to_node_map(); |
462
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|
2876 return true; |
141 | 2877 } |
2878 } | |
2879 } | |
462
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|
2880 return false; |
141 | 2881 } |
2882 | |
2883 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2884 // The table is later used in get_node_by_cpu(). | |
2885 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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|
2886 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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|
2887 // in libnuma (possible values are starting from 16, |
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|
2888 // and continuing up with every other power of 2, but less |
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|
2889 // than the maximum number of CPUs supported by kernel), and |
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|
2890 // is a subject to change (in libnuma version 2 the requirements |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2891 // are more reasonable) we'll just hardcode the number they use |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2892 // in the library. |
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|
2893 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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|
2894 |
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|
2895 size_t cpu_num = os::active_processor_count(); |
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|
2896 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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|
2897 size_t cpu_map_valid_size = |
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|
2898 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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|
2899 |
141 | 2900 cpu_to_node()->clear(); |
2901 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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|
2902 size_t node_num = numa_get_groups_num(); |
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2903 |
6197 | 2904 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
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changeset
|
2905 for (size_t i = 0; i < node_num; i++) { |
141 | 2906 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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|
2907 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2908 if (cpu_map[j] != 0) { |
462
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2909 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2910 if (cpu_map[j] & (1UL << k)) { |
462
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|
2911 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2912 } |
2913 } | |
2914 } | |
2915 } | |
2916 } | |
2917 } | |
6197 | 2918 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2919 } |
2920 | |
2921 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2922 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2923 return cpu_to_node()->at(cpu_id); | |
2924 } | |
2925 return -1; | |
2926 } | |
2927 | |
2928 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2929 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2930 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2931 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2932 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2933 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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|
2934 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
12176
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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|
2935 os::Linux::numa_set_bind_policy_func_t os::Linux::_numa_set_bind_policy; |
462
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|
2936 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2937 |
6197 | 2938 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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|
2939 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2940 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1642
diff
changeset
|
2941 return res != (uintptr_t) MAP_FAILED; |
0 | 2942 } |
2943 | |
12144
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2944 static |
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|
2945 address get_stack_commited_bottom(address bottom, size_t size) { |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2946 address nbot = bottom; |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2947 address ntop = bottom + size; |
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|
2948 |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2949 size_t page_sz = os::vm_page_size(); |
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|
2950 unsigned pages = size / page_sz; |
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|
2951 |
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diff
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|
2952 unsigned char vec[1]; |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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diff
changeset
|
2953 unsigned imin = 1, imax = pages + 1, imid; |
17765 | 2954 int mincore_return_value = 0; |
2955 | |
2956 assert(imin <= imax, "Unexpected page size"); | |
12144
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|
2957 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2958 while (imin < imax) { |
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|
2959 imid = (imax + imin) / 2; |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
2960 nbot = ntop - (imid * page_sz); |
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|
2961 |
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|
2962 // Use a trick with mincore to check whether the page is mapped or not. |
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|
2963 // mincore sets vec to 1 if page resides in memory and to 0 if page |
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|
2964 // is swapped output but if page we are asking for is unmapped |
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|
2965 // it returns -1,ENOMEM |
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|
2966 mincore_return_value = mincore(nbot, page_sz, vec); |
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|
2967 |
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|
2968 if (mincore_return_value == -1) { |
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|
2969 // Page is not mapped go up |
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|
2970 // to find first mapped page |
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|
2971 if (errno != EAGAIN) { |
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|
2972 assert(errno == ENOMEM, "Unexpected mincore errno"); |
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|
2973 imax = imid; |
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|
2974 } |
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|
2975 } else { |
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|
2976 // Page is mapped go down |
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|
2977 // to find first not mapped page |
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|
2978 imin = imid + 1; |
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|
2979 } |
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|
2980 } |
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|
2981 |
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|
2982 nbot = nbot + page_sz; |
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|
2983 |
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|
2984 // Adjust stack bottom one page up if last checked page is not mapped |
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|
2985 if (mincore_return_value == -1) { |
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|
2986 nbot = nbot + page_sz; |
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|
2987 } |
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|
2988 |
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|
2989 return nbot; |
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|
2990 } |
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|
2991 |
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|
2992 |
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3b3d12e645e7
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|
2993 // Linux uses a growable mapping for the stack, and if the mapping for |
3b3d12e645e7
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coleenp
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changeset
|
2994 // the stack guard pages is not removed when we detach a thread the |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
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changeset
|
2995 // stack cannot grow beyond the pages where the stack guard was |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2996 // 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
coleenp
parents:
1123
diff
changeset
|
2997 // that point, the Linux kernel cannot expand the stack any further |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
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|
2998 // because the guard pages are in the way, and a segfault occurs. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
2999 // |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
3000 // However, it's essential not to split the stack region by unmapping |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
3001 // 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
parents:
1123
diff
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|
3002 // 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
coleenp
parents:
1123
diff
changeset
|
3003 // the time we create them, we have to truncate the stack mapping. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3004 // So, we need to know the extent of the stack mapping when |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3005 // create_stack_guard_pages() is called. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3006 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
3007 // 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
parents:
1123
diff
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|
3008 // writing thread stacks don't use growable mappings (i.e. those |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
3009 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3010 // 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
diff
changeset
|
3011 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
changeset
|
3012 // If the (growable) stack mapping already extends beyond the point |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3013 // where we're going to put our guard pages, truncate the mapping at |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3014 // that point by munmap()ping it. This ensures that when we later |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3015 // munmap() the guard pages we don't leave a hole in the stack |
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3016 // mapping. This only affects the main/initial thread |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3017 |
6197 | 3018 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
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|
3019 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
3020 if (os::Linux::is_initial_thread()) { |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3021 // As we manually grow stack up to bottom inside create_attached_thread(), |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3022 // it's likely that os::Linux::initial_thread_stack_bottom is mapped and |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3023 // we don't need to do anything special. |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3024 // Check it first, before calling heavy function. |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3025 uintptr_t stack_extent = (uintptr_t) os::Linux::initial_thread_stack_bottom(); |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3026 unsigned char vec[1]; |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3027 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3028 if (mincore((address)stack_extent, os::vm_page_size(), vec) == -1) { |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3029 // Fallback to slow path on all errors, including EAGAIN |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3030 stack_extent = (uintptr_t) get_stack_commited_bottom( |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
3031 os::Linux::initial_thread_stack_bottom(), |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
3032 (size_t)addr - stack_extent); |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3033 } |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
3034 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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12110
diff
changeset
|
3035 if (stack_extent < (uintptr_t)addr) { |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
3036 ::munmap((void*)stack_extent, (uintptr_t)(addr - stack_extent)); |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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|
3037 } |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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diff
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|
3038 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
3039 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3040 return os::commit_memory(addr, size, !ExecMem); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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diff
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|
3041 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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diff
changeset
|
3042 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
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changeset
|
3043 // If this is a growable mapping, remove the guard pages entirely by |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3044 // munmap()ping them. If not, just call uncommit_memory(). This only |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3045 // affects the main/initial thread, but guard against future OS changes |
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3046 // It's safe to always unmap guard pages for initial thread because we |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3047 // always place it right after end of the mapped region |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3048 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
3049 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
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|
3050 uintptr_t stack_extent, stack_base; |
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3051 |
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
3052 if (os::Linux::is_initial_thread()) { |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3053 return ::munmap(addr, size) == 0; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3054 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
3055 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
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changeset
|
3056 return os::uncommit_memory(addr, size); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3057 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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1123
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changeset
|
3058 |
0 | 3059 static address _highest_vm_reserved_address = NULL; |
3060 | |
3061 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
3062 // at 'requested_addr'. If there are existing memory mappings at the same | |
3063 // location, however, they will be overwritten. If 'fixed' is false, | |
3064 // 'requested_addr' is only treated as a hint, the return value may or | |
3065 // may not start from the requested address. Unlike Linux mmap(), this | |
3066 // function returns NULL to indicate failure. | |
3067 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
3068 char * addr; | |
3069 int flags; | |
3070 | |
3071 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
3072 if (fixed) { | |
3073 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
3074 flags |= MAP_FIXED; | |
3075 } | |
3076 | |
10157 | 3077 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
3078 // touch an uncommitted page. Otherwise, the read/write might | |
3079 // succeed if we have enough swap space to back the physical page. | |
3080 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
0 | 3081 flags, -1, 0); |
3082 | |
3083 if (addr != MAP_FAILED) { | |
3084 // anon_mmap() should only get called during VM initialization, | |
3085 // don't need lock (actually we can skip locking even it can be called | |
3086 // from multiple threads, because _highest_vm_reserved_address is just a | |
3087 // hint about the upper limit of non-stack memory regions.) | |
3088 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
3089 _highest_vm_reserved_address = (address)addr + bytes; | |
3090 } | |
3091 } | |
3092 | |
3093 return addr == MAP_FAILED ? NULL : addr; | |
3094 } | |
3095 | |
3096 // Don't update _highest_vm_reserved_address, because there might be memory | |
3097 // regions above addr + size. If so, releasing a memory region only creates | |
3098 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
3099 // | |
3100 static int anon_munmap(char * addr, size_t size) { | |
3101 return ::munmap(addr, size) == 0; | |
3102 } | |
3103 | |
6197 | 3104 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 3105 size_t alignment_hint) { |
3106 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
3107 } | |
3108 | |
6197 | 3109 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 3110 return anon_munmap(addr, size); |
3111 } | |
3112 | |
3113 static address highest_vm_reserved_address() { | |
3114 return _highest_vm_reserved_address; | |
3115 } | |
3116 | |
3117 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
3118 // Linux wants the mprotect address argument to be page aligned. | |
3119 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
3120 | |
3121 // According to SUSv3, mprotect() should only be used with mappings | |
3122 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
3123 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
3124 // protection of malloc'ed or statically allocated memory). Check the | |
3125 // caller if you hit this assert. | |
3126 assert(addr == bottom, "sanity check"); | |
3127 | |
3128 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
3129 return ::mprotect(bottom, size, prot) == 0; | |
3130 } | |
3131 | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3132 // Set protections specified |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3133 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3134 bool is_committed) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3135 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3136 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3137 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3138 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3139 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3140 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
|
3141 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3142 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3143 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3144 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3145 return linux_mprotect(addr, bytes, p); |
0 | 3146 } |
3147 | |
3148 bool os::guard_memory(char* addr, size_t size) { | |
3149 return linux_mprotect(addr, size, PROT_NONE); | |
3150 } | |
3151 | |
3152 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
|
3153 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 3154 } |
3155 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3156 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
|
3157 bool result = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3158 void *p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3159 MAP_ANONYMOUS|MAP_PRIVATE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3160 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3161 if (p != MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3162 void *aligned_p = align_ptr_up(p, page_size); |
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 result = madvise(aligned_p, page_size, MADV_HUGEPAGE) == 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3165 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3166 munmap(p, page_size * 2); |
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 if (warn && !result) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3170 warning("TransparentHugePages is not supported by the operating system."); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3171 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3172 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3173 return result; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3174 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3175 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3176 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
|
3177 bool result = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3178 void *p = mmap(NULL, page_size, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3179 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3180 -1, 0); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3181 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3182 if (p != MAP_FAILED) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3183 // 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
|
3184 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3185 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3186 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3187 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3188 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3189 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3190 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3191 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3192 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3193 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3194 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3195 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3196 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3197 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3198 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3199 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3200 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3201 munmap(p, page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3202 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3203 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3204 if (warn && !result) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3205 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3206 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3207 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3208 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3209 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3210 |
2204
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 * 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
|
3213 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3214 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3215 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3216 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3217 * - (bit 1) anonymous shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3218 * - (bit 2) file-backed private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3219 * - (bit 3) file-backed shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3220 * - (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
|
3221 * effective only if the bit 2 is cleared) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3222 * - (bit 5) hugetlb private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3223 * - (bit 6) hugetlb shared memory |
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 static void set_coredump_filter(void) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3226 FILE *f; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3227 long cdm; |
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 ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3230 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3231 } |
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 if (fscanf(f, "%lx", &cdm) != 1) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3234 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3235 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3236 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3237 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3238 rewind(f); |
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 if ((cdm & LARGEPAGES_BIT) == 0) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3241 cdm |= LARGEPAGES_BIT; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3242 fprintf(f, "%#lx", cdm); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3243 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3244 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3245 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3246 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3247 |
0 | 3248 // Large page support |
3249 | |
3250 static size_t _large_page_size = 0; | |
3251 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3252 size_t os::Linux::find_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3253 size_t large_page_size = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3254 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3255 // 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
|
3256 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3257 // 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
|
3258 // page as large as 256M. |
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 // 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
|
3261 // for a line with the following format: |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3262 // Hugepagesize: 2048 kB |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3263 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3264 // 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
|
3265 // 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
|
3266 // the processor. |
0 | 3267 |
1010 | 3268 #ifndef ZERO |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3269 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
|
3270 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3271 #endif // ZERO |
0 | 3272 |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3273 FILE *fp = fopen("/proc/meminfo", "r"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3274 if (fp) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3275 while (!feof(fp)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3276 int x = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3277 char buf[16]; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3278 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3279 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3280 large_page_size = x * K; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3281 break; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3282 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3283 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3284 // skip to next line |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3285 for (;;) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3286 int ch = fgetc(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3287 if (ch == EOF || ch == (int)'\n') break; |
0 | 3288 } |
3289 } | |
3290 } | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3291 fclose(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3292 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3293 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3294 if (!FLAG_IS_DEFAULT(LargePageSizeInBytes) && LargePageSizeInBytes != large_page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3295 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
|
3296 SIZE_FORMAT "%s.", byte_size_in_proper_unit(large_page_size), |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3297 proper_unit_for_byte_size(large_page_size)); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3298 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3299 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3300 return large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3301 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3302 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3303 size_t os::Linux::setup_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3304 _large_page_size = Linux::find_large_page_size(); |
0 | 3305 const size_t default_page_size = (size_t)Linux::page_size(); |
3306 if (_large_page_size > default_page_size) { | |
3307 _page_sizes[0] = _large_page_size; | |
3308 _page_sizes[1] = default_page_size; | |
3309 _page_sizes[2] = 0; | |
3310 } | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3311 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3312 return _large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3313 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3314 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3315 bool os::Linux::setup_large_page_type(size_t page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3316 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3317 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3318 FLAG_IS_DEFAULT(UseTransparentHugePages)) { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3319 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3320 // 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
|
3321 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3322 // Try UseHugeTLBFS and then UseSHM. |
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3323 UseHugeTLBFS = UseSHM = true; |
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|
3324 |
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changeset
|
3325 // Don't try UseTransparentHugePages since there are known |
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|
3326 // performance issues with it turned on. This might change in the future. |
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|
3327 UseTransparentHugePages = false; |
12110
4c84d351cca9
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|
3328 } |
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changeset
|
3329 |
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changeset
|
3330 if (UseTransparentHugePages) { |
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|
3331 bool warn_on_failure = !FLAG_IS_DEFAULT(UseTransparentHugePages); |
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|
3332 if (transparent_huge_pages_sanity_check(warn_on_failure, page_size)) { |
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|
3333 UseHugeTLBFS = false; |
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changeset
|
3334 UseSHM = false; |
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|
3335 return true; |
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diff
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|
3336 } |
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|
3337 UseTransparentHugePages = false; |
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|
3338 } |
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changeset
|
3339 |
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changeset
|
3340 if (UseHugeTLBFS) { |
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|
3341 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
4c84d351cca9
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changeset
|
3342 if (hugetlbfs_sanity_check(warn_on_failure, page_size)) { |
4c84d351cca9
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changeset
|
3343 UseSHM = false; |
4c84d351cca9
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diff
changeset
|
3344 return true; |
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diff
changeset
|
3345 } |
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changeset
|
3346 UseHugeTLBFS = false; |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
3347 } |
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diff
changeset
|
3348 |
4c84d351cca9
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diff
changeset
|
3349 return UseSHM; |
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diff
changeset
|
3350 } |
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changeset
|
3351 |
4c84d351cca9
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changeset
|
3352 void os::large_page_init() { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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changeset
|
3353 if (!UseLargePages && |
263f2c796d6c
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12252
diff
changeset
|
3354 !UseTransparentHugePages && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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diff
changeset
|
3355 !UseHugeTLBFS && |
263f2c796d6c
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diff
changeset
|
3356 !UseSHM) { |
263f2c796d6c
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diff
changeset
|
3357 // Not using large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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12252
diff
changeset
|
3358 return; |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
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diff
changeset
|
3359 } |
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8024838: Significant slowdown due to transparent huge pages
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diff
changeset
|
3360 |
263f2c796d6c
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diff
changeset
|
3361 if (!FLAG_IS_DEFAULT(UseLargePages) && !UseLargePages) { |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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diff
changeset
|
3362 // The user explicitly turned off large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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diff
changeset
|
3363 // Ignore the rest of the large pages flags. |
263f2c796d6c
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changeset
|
3364 UseTransparentHugePages = false; |
12110
4c84d351cca9
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diff
changeset
|
3365 UseHugeTLBFS = false; |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3366 UseSHM = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3367 return; |
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diff
changeset
|
3368 } |
4c84d351cca9
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diff
changeset
|
3369 |
4c84d351cca9
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diff
changeset
|
3370 size_t large_page_size = Linux::setup_large_page_size(); |
4c84d351cca9
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|
3371 UseLargePages = Linux::setup_large_page_type(large_page_size); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
3372 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3373 set_coredump_filter(); |
0 | 3374 } |
3375 | |
3376 #ifndef SHM_HUGETLB | |
3377 #define SHM_HUGETLB 04000 | |
3378 #endif | |
3379 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
3380 char* os::Linux::reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
656 | 3381 // "exec" is passed in but not used. Creating the shared image for |
3382 // the code cache doesn't have an SHM_X executable permission to check. | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3383 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
12110
4c84d351cca9
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diff
changeset
|
3384 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
4c84d351cca9
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changeset
|
3385 |
4c84d351cca9
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diff
changeset
|
3386 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { |
4c84d351cca9
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changeset
|
3387 return NULL; // Fallback to small pages. |
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diff
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|
3388 } |
0 | 3389 |
3390 key_t key = IPC_PRIVATE; | |
3391 char *addr; | |
3392 | |
3393 bool warn_on_failure = UseLargePages && | |
3394 (!FLAG_IS_DEFAULT(UseLargePages) || | |
12110
4c84d351cca9
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changeset
|
3395 !FLAG_IS_DEFAULT(UseSHM) || |
0 | 3396 !FLAG_IS_DEFAULT(LargePageSizeInBytes) |
3397 ); | |
3398 char msg[128]; | |
3399 | |
3400 // Create a large shared memory region to attach to based on size. | |
3401 // Currently, size is the total size of the heap | |
3402 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
3403 if (shmid == -1) { | |
3404 // Possible reasons for shmget failure: | |
3405 // 1. shmmax is too small for Java heap. | |
3406 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
3407 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
3408 // 2. not enough large page memory. | |
3409 // > check available large pages: cat /proc/meminfo | |
3410 // > increase amount of large pages: | |
3411 // echo new_value > /proc/sys/vm/nr_hugepages | |
3412 // Note 1: different Linux may use different name for this property, | |
3413 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
3414 // Note 2: it's possible there's enough physical memory available but | |
3415 // they are so fragmented after a long run that they can't | |
3416 // coalesce into large pages. Try to reserve large pages when | |
3417 // the system is still "fresh". | |
3418 if (warn_on_failure) { | |
3419 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3420 warning("%s", msg); |
0 | 3421 } |
3422 return NULL; | |
3423 } | |
3424 | |
3425 // attach to the region | |
1537
79bf863697eb
6951686: Using large pages on Linux prevents zero based compressed oops
kvn
parents:
1500
diff
changeset
|
3426 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 3427 int err = errno; |
3428 | |
3429 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3430 // will be deleted when it's detached by shmdt() or when the process | |
3431 // terminates. If shmat() is not successful this will remove the shared | |
3432 // segment immediately. | |
3433 shmctl(shmid, IPC_RMID, NULL); | |
3434 | |
3435 if ((intptr_t)addr == -1) { | |
3436 if (warn_on_failure) { | |
3437 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3438 warning("%s", msg); |
0 | 3439 } |
3440 return NULL; | |
3441 } | |
3442 | |
12110
4c84d351cca9
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diff
changeset
|
3443 return addr; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3444 } |
4c84d351cca9
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diff
changeset
|
3445 |
4c84d351cca9
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diff
changeset
|
3446 static void warn_on_large_pages_failure(char* req_addr, size_t bytes, int error) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3447 assert(error == ENOMEM, "Only expect to fail if no memory is available"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3448 |
4c84d351cca9
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diff
changeset
|
3449 bool warn_on_failure = UseLargePages && |
4c84d351cca9
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diff
changeset
|
3450 (!FLAG_IS_DEFAULT(UseLargePages) || |
4c84d351cca9
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diff
changeset
|
3451 !FLAG_IS_DEFAULT(UseHugeTLBFS) || |
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changeset
|
3452 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); |
4c84d351cca9
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changeset
|
3453 |
4c84d351cca9
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diff
changeset
|
3454 if (warn_on_failure) { |
4c84d351cca9
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diff
changeset
|
3455 char msg[128]; |
4c84d351cca9
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diff
changeset
|
3456 jio_snprintf(msg, sizeof(msg), "Failed to reserve large pages memory req_addr: " |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3457 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
|
3458 warning("%s", msg); |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3459 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3460 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3461 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3462 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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diff
changeset
|
3463 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3464 assert(is_size_aligned(bytes, os::large_page_size()), "Unaligned size"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3465 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3466 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3467 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3468 char* addr = (char*)::mmap(req_addr, bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3469 MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3470 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3471 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3472 if (addr == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3473 warn_on_large_pages_failure(req_addr, bytes, errno); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3474 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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11092
diff
changeset
|
3475 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3476 |
4c84d351cca9
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diff
changeset
|
3477 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
zgu
parents:
8710
diff
changeset
|
3478 |
0 | 3479 return addr; |
3480 } | |
3481 | |
12110
4c84d351cca9
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stefank
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diff
changeset
|
3482 char* os::Linux::reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
4c84d351cca9
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|
3483 size_t large_page_size = os::large_page_size(); |
4c84d351cca9
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|
3484 |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3485 assert(bytes >= large_page_size, "Shouldn't allocate large pages for small sizes"); |
4c84d351cca9
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stefank
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diff
changeset
|
3486 |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3487 // Allocate small pages. |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3488 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3489 char* start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3490 if (req_addr != NULL) { |
4c84d351cca9
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diff
changeset
|
3491 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
4c84d351cca9
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|
3492 assert(is_size_aligned(bytes, alignment), "Must be"); |
4c84d351cca9
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changeset
|
3493 start = os::reserve_memory(bytes, req_addr); |
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|
3494 assert(start == NULL || start == req_addr, "Must be"); |
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changeset
|
3495 } else { |
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changeset
|
3496 start = os::reserve_memory_aligned(bytes, alignment); |
4c84d351cca9
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changeset
|
3497 } |
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diff
changeset
|
3498 |
4c84d351cca9
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diff
changeset
|
3499 if (start == NULL) { |
4c84d351cca9
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diff
changeset
|
3500 return NULL; |
4c84d351cca9
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diff
changeset
|
3501 } |
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changeset
|
3502 |
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changeset
|
3503 assert(is_ptr_aligned(start, alignment), "Must be"); |
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changeset
|
3504 |
20360 | 3505 if (MemTracker::tracking_level() > NMT_minimal) { |
3506 // os::reserve_memory_special will record this memory area. | |
3507 // Need to release it here to prevent overlapping reservations. | |
3508 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); | |
3509 tkr.record((address)start, bytes); | |
3510 } | |
12110
4c84d351cca9
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changeset
|
3511 |
4c84d351cca9
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diff
changeset
|
3512 char* end = start + bytes; |
4c84d351cca9
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diff
changeset
|
3513 |
4c84d351cca9
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changeset
|
3514 // Find the regions of the allocated chunk that can be promoted to large pages. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3515 char* lp_start = (char*)align_ptr_up(start, large_page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3516 char* lp_end = (char*)align_ptr_down(end, large_page_size); |
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changeset
|
3517 |
4c84d351cca9
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diff
changeset
|
3518 size_t lp_bytes = lp_end - lp_start; |
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changeset
|
3519 |
4c84d351cca9
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diff
changeset
|
3520 assert(is_size_aligned(lp_bytes, large_page_size), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3521 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3522 if (lp_bytes == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3523 // The mapped region doesn't even span the start and the end of a large page. |
4c84d351cca9
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diff
changeset
|
3524 // Fall back to allocate a non-special area. |
4c84d351cca9
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diff
changeset
|
3525 ::munmap(start, end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3526 return NULL; |
4c84d351cca9
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diff
changeset
|
3527 } |
4c84d351cca9
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diff
changeset
|
3528 |
4c84d351cca9
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changeset
|
3529 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3530 |
4c84d351cca9
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diff
changeset
|
3531 |
4c84d351cca9
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diff
changeset
|
3532 void* result; |
4c84d351cca9
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diff
changeset
|
3533 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3534 if (start != lp_start) { |
4c84d351cca9
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diff
changeset
|
3535 result = ::mmap(start, lp_start - start, prot, |
4c84d351cca9
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changeset
|
3536 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3537 -1, 0); |
4c84d351cca9
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diff
changeset
|
3538 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3539 ::munmap(lp_start, end - lp_start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3540 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3541 } |
4c84d351cca9
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diff
changeset
|
3542 } |
4c84d351cca9
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diff
changeset
|
3543 |
4c84d351cca9
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diff
changeset
|
3544 result = ::mmap(lp_start, lp_bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3545 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3546 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3547 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3548 warn_on_large_pages_failure(req_addr, bytes, errno); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3549 // 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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diff
changeset
|
3550 // have regions before and after with small pages. Release these regions. |
4c84d351cca9
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diff
changeset
|
3551 // |
4c84d351cca9
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diff
changeset
|
3552 // | mapped | unmapped | mapped | |
4c84d351cca9
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diff
changeset
|
3553 // ^ ^ ^ ^ |
4c84d351cca9
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diff
changeset
|
3554 // start lp_start lp_end end |
4c84d351cca9
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diff
changeset
|
3555 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3556 ::munmap(start, lp_start - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3557 ::munmap(lp_end, end - lp_end); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3558 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3559 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3560 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3561 if (lp_end != end) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3562 result = ::mmap(lp_end, end - lp_end, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3563 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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11092
diff
changeset
|
3564 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3565 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3566 ::munmap(start, lp_end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3567 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3568 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3569 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3570 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3571 return start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3572 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3573 |
4c84d351cca9
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stefank
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changeset
|
3574 char* os::Linux::reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3575 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3576 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3577 assert(is_power_of_2(alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3578 assert(is_power_of_2(os::large_page_size()), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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changeset
|
3579 assert(bytes >= os::large_page_size(), "Shouldn't allocate large pages for small sizes"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3580 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3581 if (is_size_aligned(bytes, os::large_page_size()) && alignment <= os::large_page_size()) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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changeset
|
3582 return reserve_memory_special_huge_tlbfs_only(bytes, req_addr, exec); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3583 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3584 return reserve_memory_special_huge_tlbfs_mixed(bytes, alignment, req_addr, exec); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3585 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3586 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3587 |
4c84d351cca9
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stefank
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diff
changeset
|
3588 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3589 assert(UseLargePages, "only for large pages"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3590 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3591 char* addr; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3592 if (UseSHM) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3593 addr = os::Linux::reserve_memory_special_shm(bytes, alignment, req_addr, exec); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3594 } else { |
4c84d351cca9
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diff
changeset
|
3595 assert(UseHugeTLBFS, "must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3596 addr = os::Linux::reserve_memory_special_huge_tlbfs(bytes, alignment, req_addr, exec); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3597 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3598 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3599 if (addr != NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3600 if (UseNUMAInterleaving) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3601 numa_make_global(addr, bytes); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3602 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3603 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3604 // The memory is committed |
20360 | 3605 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); |
12110
4c84d351cca9
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changeset
|
3606 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3607 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3608 return addr; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3609 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3610 |
4c84d351cca9
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changeset
|
3611 bool os::Linux::release_memory_special_shm(char* base, size_t bytes) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3612 // detaching the SHM segment will also delete it, see reserve_memory_special_shm() |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3613 return shmdt(base) == 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3614 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3615 |
4c84d351cca9
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changeset
|
3616 bool os::Linux::release_memory_special_huge_tlbfs(char* base, size_t bytes) { |
4c84d351cca9
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changeset
|
3617 return pd_release_memory(base, bytes); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3618 } |
4c84d351cca9
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changeset
|
3619 |
0 | 3620 bool os::release_memory_special(char* base, size_t bytes) { |
20360 | 3621 bool res; |
3622 if (MemTracker::tracking_level() > NMT_minimal) { | |
3623 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); | |
3624 res = os::Linux::release_memory_special_impl(base, bytes); | |
3625 if (res) { | |
3626 tkr.record((address)base, bytes); | |
3627 } | |
3628 | |
3629 } else { | |
3630 res = os::Linux::release_memory_special_impl(base, bytes); | |
3631 } | |
3632 return res; | |
3633 } | |
3634 | |
3635 bool os::Linux::release_memory_special_impl(char* base, size_t bytes) { | |
12110
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3636 assert(UseLargePages, "only for large pages"); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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3637 bool res; |
20360 | 3638 |
12110
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3639 if (UseSHM) { |
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|
3640 res = os::Linux::release_memory_special_shm(base, bytes); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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3641 } else { |
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3642 assert(UseHugeTLBFS, "must be"); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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3643 res = os::Linux::release_memory_special_huge_tlbfs(base, bytes); |
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3644 } |
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3645 return res; |
0 | 3646 } |
3647 | |
3648 size_t os::large_page_size() { | |
3649 return _large_page_size; | |
3650 } | |
3651 | |
12110
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3652 // With SysV SHM the entire memory region must be allocated as shared |
3286
139667d9836a
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3653 // memory. |
12110
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3654 // HugeTLBFS allows application to commit large page memory on demand. |
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3655 // However, when committing memory with HugeTLBFS fails, the region |
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3656 // that was supposed to be committed will lose the old reservation |
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3657 // and allow other threads to steal that memory region. Because of this |
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3658 // behavior we can't commit HugeTLBFS memory. |
0 | 3659 bool os::can_commit_large_page_memory() { |
12110
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3660 return UseTransparentHugePages; |
0 | 3661 } |
3662 | |
79
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6642862: Code cache allocation fails with large pages after 6588638
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|
3663 bool os::can_execute_large_page_memory() { |
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3664 return UseTransparentHugePages || UseHugeTLBFS; |
79
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3665 } |
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3666 |
0 | 3667 // Reserve memory at an arbitrary address, only if that area is |
3668 // available (and not reserved for something else). | |
3669 | |
6197 | 3670 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3671 const int max_tries = 10; |
3672 char* base[max_tries]; | |
3673 size_t size[max_tries]; | |
3674 const size_t gap = 0x000000; | |
3675 | |
3676 // Assert only that the size is a multiple of the page size, since | |
3677 // that's all that mmap requires, and since that's all we really know | |
3678 // about at this low abstraction level. If we need higher alignment, | |
3679 // we can either pass an alignment to this method or verify alignment | |
3680 // in one of the methods further up the call chain. See bug 5044738. | |
3681 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3682 | |
3683 // Repeatedly allocate blocks until the block is allocated at the | |
3684 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3685 // automatically update _highest_vm_reserved_address if the call is | |
3686 // successful. The variable tracks the highest memory address every reserved | |
3687 // by JVM. It is used to detect heap-stack collision if running with | |
3688 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3689 // space than needed, it could confuse the collision detecting code. To | |
3690 // solve the problem, save current _highest_vm_reserved_address and | |
3691 // calculate the correct value before return. | |
3692 address old_highest = _highest_vm_reserved_address; | |
3693 | |
3694 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3695 // if kernel honors the hint then we can return immediately. | |
3696 char * addr = anon_mmap(requested_addr, bytes, false); | |
3697 if (addr == requested_addr) { | |
3698 return requested_addr; | |
3699 } | |
3700 | |
3701 if (addr != NULL) { | |
3702 // mmap() is successful but it fails to reserve at the requested address | |
3703 anon_munmap(addr, bytes); | |
3704 } | |
3705 | |
3706 int i; | |
3707 for (i = 0; i < max_tries; ++i) { | |
3708 base[i] = reserve_memory(bytes); | |
3709 | |
3710 if (base[i] != NULL) { | |
3711 // Is this the block we wanted? | |
3712 if (base[i] == requested_addr) { | |
3713 size[i] = bytes; | |
3714 break; | |
3715 } | |
3716 | |
3717 // Does this overlap the block we wanted? Give back the overlapped | |
3718 // parts and try again. | |
3719 | |
3720 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3721 if (top_overlap >= 0 && top_overlap < bytes) { | |
3722 unmap_memory(base[i], top_overlap); | |
3723 base[i] += top_overlap; | |
3724 size[i] = bytes - top_overlap; | |
3725 } else { | |
3726 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3727 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3728 unmap_memory(requested_addr, bottom_overlap); | |
3729 size[i] = bytes - bottom_overlap; | |
3730 } else { | |
3731 size[i] = bytes; | |
3732 } | |
3733 } | |
3734 } | |
3735 } | |
3736 | |
3737 // Give back the unused reserved pieces. | |
3738 | |
3739 for (int j = 0; j < i; ++j) { | |
3740 if (base[j] != NULL) { | |
3741 unmap_memory(base[j], size[j]); | |
3742 } | |
3743 } | |
3744 | |
3745 if (i < max_tries) { | |
3746 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3747 return requested_addr; | |
3748 } else { | |
3749 _highest_vm_reserved_address = old_highest; | |
3750 return NULL; | |
3751 } | |
3752 } | |
3753 | |
3754 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3755 return ::read(fd, buf, nBytes); | |
3756 } | |
3757 | |
3758 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3759 // Solaris uses poll(), linux uses park(). | |
3760 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3761 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3762 // SIGSEGV, see 4355769. | |
3763 | |
3764 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3765 assert(thread == Thread::current(), "thread consistency check"); | |
3766 | |
3767 ParkEvent * const slp = thread->_SleepEvent ; | |
3768 slp->reset() ; | |
3769 OrderAccess::fence() ; | |
3770 | |
3771 if (interruptible) { | |
3772 jlong prevtime = javaTimeNanos(); | |
3773 | |
3774 for (;;) { | |
3775 if (os::is_interrupted(thread, true)) { | |
3776 return OS_INTRPT; | |
3777 } | |
3778 | |
3779 jlong newtime = javaTimeNanos(); | |
3780 | |
3781 if (newtime - prevtime < 0) { | |
3782 // time moving backwards, should only happen if no monotonic clock | |
3783 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3784 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3785 } else { | |
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3786 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3787 } |
3788 | |
3789 if(millis <= 0) { | |
3790 return OS_OK; | |
3791 } | |
3792 | |
3793 prevtime = newtime; | |
3794 | |
3795 { | |
3796 assert(thread->is_Java_thread(), "sanity check"); | |
3797 JavaThread *jt = (JavaThread *) thread; | |
3798 ThreadBlockInVM tbivm(jt); | |
3799 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3800 | |
3801 jt->set_suspend_equivalent(); | |
3802 // cleared by handle_special_suspend_equivalent_condition() or | |
3803 // java_suspend_self() via check_and_wait_while_suspended() | |
3804 | |
3805 slp->park(millis); | |
3806 | |
3807 // were we externally suspended while we were waiting? | |
3808 jt->check_and_wait_while_suspended(); | |
3809 } | |
3810 } | |
3811 } else { | |
3812 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3813 jlong prevtime = javaTimeNanos(); | |
3814 | |
3815 for (;;) { | |
3816 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3817 // the 1st iteration ... | |
3818 jlong newtime = javaTimeNanos(); | |
3819 | |
3820 if (newtime - prevtime < 0) { | |
3821 // time moving backwards, should only happen if no monotonic clock | |
3822 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3823 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3824 } else { | |
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3825 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3826 } |
3827 | |
3828 if(millis <= 0) break ; | |
3829 | |
3830 prevtime = newtime; | |
3831 slp->park(millis); | |
3832 } | |
3833 return OS_OK ; | |
3834 } | |
3835 } | |
3836 | |
17706
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3837 // |
0e6af9b390af
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|
3838 // Short sleep, direct OS call. |
0e6af9b390af
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3839 // |
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3840 // Note: certain versions of Linux CFS scheduler (since 2.6.23) do not guarantee |
0e6af9b390af
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3841 // sched_yield(2) will actually give up the CPU: |
0e6af9b390af
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3842 // |
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3843 // * Alone on this pariticular CPU, keeps running. |
0e6af9b390af
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3844 // * Before the introduction of "skip_buddy" with "compat_yield" disabled |
0e6af9b390af
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3845 // (pre 2.6.39). |
0e6af9b390af
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3846 // |
0e6af9b390af
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|
3847 // So calling this with 0 is an alternative. |
0e6af9b390af
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|
3848 // |
0e6af9b390af
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|
3849 void os::naked_short_sleep(jlong ms) { |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3850 struct timespec req; |
0e6af9b390af
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|
3851 |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3852 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3853 req.tv_sec = 0; |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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changeset
|
3854 if (ms > 0) { |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3855 req.tv_nsec = (ms % 1000) * 1000000; |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3856 } |
0e6af9b390af
8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3857 else { |
0e6af9b390af
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|
3858 req.tv_nsec = 1; |
0e6af9b390af
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|
3859 } |
0e6af9b390af
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|
3860 |
0e6af9b390af
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|
3861 nanosleep(&req, NULL); |
0e6af9b390af
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|
3862 |
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|
3863 return; |
0 | 3864 } |
3865 | |
3866 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3867 void os::infinite_sleep() { | |
3868 while (true) { // sleep forever ... | |
3869 ::sleep(100); // ... 100 seconds at a time | |
3870 } | |
3871 } | |
3872 | |
3873 // Used to convert frequent JVM_Yield() to nops | |
3874 bool os::dont_yield() { | |
3875 return DontYieldALot; | |
3876 } | |
3877 | |
3878 void os::yield() { | |
3879 sched_yield(); | |
3880 } | |
3881 | |
3882 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3883 | |
3884 void os::yield_all(int attempts) { | |
3885 // Yields to all threads, including threads with lower priorities | |
3886 // Threads on Linux are all with same priority. The Solaris style | |
3887 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3888 sched_yield(); | |
3889 } | |
3890 | |
3891 // Called from the tight loops to possibly influence time-sharing heuristics | |
3892 void os::loop_breaker(int attempts) { | |
3893 os::yield_all(attempts); | |
3894 } | |
3895 | |
3896 //////////////////////////////////////////////////////////////////////////////// | |
3897 // thread priority support | |
3898 | |
3899 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3900 // only supports dynamic priority, static priority must be zero. For real-time | |
3901 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3902 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3903 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3904 // of 5 runs - Sep 2005). | |
3905 // | |
3906 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3907 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3908 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3909 // threads. It has always been the case, but could change in the future. For | |
3910 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3911 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3912 | |
4854
de268c8a8075
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|
3913 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3914 19, // 0 Entry should never be used |
3915 | |
3916 4, // 1 MinPriority | |
3917 3, // 2 | |
3918 2, // 3 | |
3919 | |
3920 1, // 4 | |
3921 0, // 5 NormPriority | |
3922 -1, // 6 | |
3923 | |
3924 -2, // 7 | |
3925 -3, // 8 | |
3926 -4, // 9 NearMaxPriority | |
3927 | |
4854
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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|
3928 -5, // 10 MaxPriority |
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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|
3929 |
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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changeset
|
3930 -5 // 11 CriticalPriority |
0 | 3931 }; |
3932 | |
3933 static int prio_init() { | |
3934 if (ThreadPriorityPolicy == 1) { | |
3935 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3936 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3937 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3938 if (geteuid() != 0) { | |
3939 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3940 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3941 } | |
3942 ThreadPriorityPolicy = 0; | |
3943 } | |
3944 } | |
4854
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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diff
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|
3945 if (UseCriticalJavaThreadPriority) { |
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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|
3946 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
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|
3947 } |
0 | 3948 return 0; |
3949 } | |
3950 | |
3951 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3952 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3953 | |
3954 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3955 return (ret == 0) ? OS_OK : OS_ERR; | |
3956 } | |
3957 | |
3958 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3959 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3960 *priority_ptr = java_to_os_priority[NormPriority]; | |
3961 return OS_OK; | |
3962 } | |
3963 | |
3964 errno = 0; | |
3965 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3966 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3967 } | |
3968 | |
3969 // Hint to the underlying OS that a task switch would not be good. | |
3970 // Void return because it's a hint and can fail. | |
3971 void os::hint_no_preempt() {} | |
3972 | |
3973 //////////////////////////////////////////////////////////////////////////////// | |
3974 // suspend/resume support | |
3975 | |
3976 // the low-level signal-based suspend/resume support is a remnant from the | |
3977 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3978 // within hotspot. Now there is a single use-case for this: | |
3979 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3980 // that runs in the watcher thread. | |
3981 // The remaining code is greatly simplified from the more general suspension | |
3982 // code that used to be used. | |
3983 // | |
3984 // The protocol is quite simple: | |
3985 // - suspend: | |
3986 // - sends a signal to the target thread | |
3987 // - polls the suspend state of the osthread using a yield loop | |
3988 // - target thread signal handler (SR_handler) sets suspend state | |
3989 // and blocks in sigsuspend until continued | |
3990 // - resume: | |
3991 // - sets target osthread state to continue | |
3992 // - sends signal to end the sigsuspend loop in the SR_handler | |
3993 // | |
3994 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3995 // | |
3996 | |
3997 static void resume_clear_context(OSThread *osthread) { | |
3998 osthread->set_ucontext(NULL); | |
3999 osthread->set_siginfo(NULL); | |
4000 } | |
4001 | |
4002 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
4003 osthread->set_ucontext(context); | |
4004 osthread->set_siginfo(siginfo); | |
4005 } | |
4006 | |
4007 // | |
4008 // Handler function invoked when a thread's execution is suspended or | |
4009 // resumed. We have to be careful that only async-safe functions are | |
4010 // called here (Note: most pthread functions are not async safe and | |
4011 // should be avoided.) | |
4012 // | |
4013 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
4014 // interface point of view, but sigwait() prevents the signal hander | |
4015 // from being run. libpthread would get very confused by not having | |
4016 // its signal handlers run and prevents sigwait()'s use with the | |
4017 // mutex granting granting signal. | |
4018 // | |
10405 | 4019 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
0 | 4020 // |
4021 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
4022 // Save and restore errno to avoid confusing native code with EINTR | |
4023 // after sigsuspend. | |
4024 int old_errno = errno; | |
4025 | |
4026 Thread* thread = Thread::current(); | |
4027 OSThread* osthread = thread->osthread(); | |
10405 | 4028 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
4029 | |
4030 os::SuspendResume::State current = osthread->sr.state(); | |
4031 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
0 | 4032 suspend_save_context(osthread, siginfo, context); |
4033 | |
10405 | 4034 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
4035 os::SuspendResume::State state = osthread->sr.suspended(); | |
4036 if (state == os::SuspendResume::SR_SUSPENDED) { | |
4037 sigset_t suspend_set; // signals for sigsuspend() | |
4038 | |
4039 // get current set of blocked signals and unblock resume signal | |
4040 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
4041 sigdelset(&suspend_set, SR_signum); | |
4042 | |
4043 sr_semaphore.signal(); | |
4044 // wait here until we are resumed | |
4045 while (1) { | |
4046 sigsuspend(&suspend_set); | |
4047 | |
4048 os::SuspendResume::State result = osthread->sr.running(); | |
4049 if (result == os::SuspendResume::SR_RUNNING) { | |
4050 sr_semaphore.signal(); | |
4051 break; | |
4052 } | |
4053 } | |
4054 | |
4055 } else if (state == os::SuspendResume::SR_RUNNING) { | |
4056 // request was cancelled, continue | |
4057 } else { | |
4058 ShouldNotReachHere(); | |
4059 } | |
0 | 4060 |
4061 resume_clear_context(osthread); | |
10405 | 4062 } else if (current == os::SuspendResume::SR_RUNNING) { |
4063 // request was cancelled, continue | |
4064 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4065 // ignore | |
0 | 4066 } else { |
10405 | 4067 // ignore |
0 | 4068 } |
4069 | |
4070 errno = old_errno; | |
4071 } | |
4072 | |
4073 | |
4074 static int SR_initialize() { | |
4075 struct sigaction act; | |
4076 char *s; | |
4077 /* Get signal number to use for suspend/resume */ | |
4078 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
4079 int sig = ::strtol(s, 0, 10); | |
4080 if (sig > 0 || sig < _NSIG) { | |
4081 SR_signum = sig; | |
4082 } | |
4083 } | |
4084 | |
4085 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
4086 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
4087 | |
4088 sigemptyset(&SR_sigset); | |
4089 sigaddset(&SR_sigset, SR_signum); | |
4090 | |
4091 /* Set up signal handler for suspend/resume */ | |
4092 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
4093 act.sa_handler = (void (*)(int)) SR_handler; | |
4094 | |
4095 // SR_signum is blocked by default. | |
4096 // 4528190 - We also need to block pthread restart signal (32 on all | |
4097 // supported Linux platforms). Note that LinuxThreads need to block | |
4098 // this signal for all threads to work properly. So we don't have | |
4099 // to use hard-coded signal number when setting up the mask. | |
4100 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
4101 | |
4102 if (sigaction(SR_signum, &act, 0) == -1) { | |
4103 return -1; | |
4104 } | |
4105 | |
4106 // Save signal flag | |
4107 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
4108 return 0; | |
4109 } | |
4110 | |
10405 | 4111 static int sr_notify(OSThread* osthread) { |
4112 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
4113 assert_status(status == 0, status, "pthread_kill"); | |
4114 return status; | |
4115 } | |
4116 | |
4117 // "Randomly" selected value for how long we want to spin | |
4118 // before bailing out on suspending a thread, also how often | |
4119 // we send a signal to a thread we want to resume | |
4120 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
4121 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
0 | 4122 |
4123 // returns true on success and false on error - really an error is fatal | |
4124 // but this seems the normal response to library errors | |
4125 static bool do_suspend(OSThread* osthread) { | |
10405 | 4126 assert(osthread->sr.is_running(), "thread should be running"); |
4127 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
4128 | |
0 | 4129 // mark as suspended and send signal |
10405 | 4130 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
4131 // failed to switch, state wasn't running? | |
4132 ShouldNotReachHere(); | |
4133 return false; | |
4134 } | |
4135 | |
4136 if (sr_notify(osthread) != 0) { | |
4137 ShouldNotReachHere(); | |
4138 } | |
4139 | |
4140 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
4141 while (true) { | |
4142 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4143 break; | |
4144 } else { | |
4145 // timeout | |
4146 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
4147 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
4148 return false; | |
4149 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
4150 // make sure that we consume the signal on the semaphore as well | |
4151 sr_semaphore.wait(); | |
4152 break; | |
4153 } else { | |
4154 ShouldNotReachHere(); | |
4155 return false; | |
4156 } | |
0 | 4157 } |
10405 | 4158 } |
4159 | |
4160 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
4161 return true; | |
0 | 4162 } |
4163 | |
4164 static void do_resume(OSThread* osthread) { | |
4165 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 4166 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
4167 | |
4168 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4169 // failed to switch to WAKEUP_REQUEST | |
4170 ShouldNotReachHere(); | |
4171 return; | |
4172 } | |
4173 | |
4174 while (true) { | |
4175 if (sr_notify(osthread) == 0) { | |
4176 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4177 if (osthread->sr.is_running()) { | |
4178 return; | |
4179 } | |
4180 } | |
4181 } else { | |
4182 ShouldNotReachHere(); | |
0 | 4183 } |
4184 } | |
10405 | 4185 |
4186 guarantee(osthread->sr.is_running(), "Must be running!"); | |
0 | 4187 } |
4188 | |
4189 //////////////////////////////////////////////////////////////////////////////// | |
4190 // interrupt support | |
4191 | |
4192 void os::interrupt(Thread* thread) { | |
4193 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4194 "possibility of dangling Thread pointer"); | |
4195 | |
4196 OSThread* osthread = thread->osthread(); | |
4197 | |
4198 if (!osthread->interrupted()) { | |
4199 osthread->set_interrupted(true); | |
4200 // More than one thread can get here with the same value of osthread, | |
4201 // resulting in multiple notifications. We do, however, want the store | |
4202 // to interrupted() to be visible to other threads before we execute unpark(). | |
4203 OrderAccess::fence(); | |
4204 ParkEvent * const slp = thread->_SleepEvent ; | |
4205 if (slp != NULL) slp->unpark() ; | |
4206 } | |
4207 | |
4208 // For JSR166. Unpark even if interrupt status already was set | |
4209 if (thread->is_Java_thread()) | |
4210 ((JavaThread*)thread)->parker()->unpark(); | |
4211 | |
4212 ParkEvent * ev = thread->_ParkEvent ; | |
4213 if (ev != NULL) ev->unpark() ; | |
4214 | |
4215 } | |
4216 | |
4217 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
4218 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4219 "possibility of dangling Thread pointer"); | |
4220 | |
4221 OSThread* osthread = thread->osthread(); | |
4222 | |
4223 bool interrupted = osthread->interrupted(); | |
4224 | |
4225 if (interrupted && clear_interrupted) { | |
4226 osthread->set_interrupted(false); | |
4227 // consider thread->_SleepEvent->reset() ... optional optimization | |
4228 } | |
4229 | |
4230 return interrupted; | |
4231 } | |
4232 | |
4233 /////////////////////////////////////////////////////////////////////////////////// | |
4234 // signal handling (except suspend/resume) | |
4235 | |
4236 // This routine may be used by user applications as a "hook" to catch signals. | |
4237 // The user-defined signal handler must pass unrecognized signals to this | |
4238 // routine, and if it returns true (non-zero), then the signal handler must | |
4239 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
4240 // routine will never retun false (zero), but instead will execute a VM panic | |
4241 // routine kill the process. | |
4242 // | |
4243 // If this routine returns false, it is OK to call it again. This allows | |
4244 // the user-defined signal handler to perform checks either before or after | |
4245 // the VM performs its own checks. Naturally, the user code would be making | |
4246 // a serious error if it tried to handle an exception (such as a null check | |
4247 // or breakpoint) that the VM was generating for its own correct operation. | |
4248 // | |
4249 // This routine may recognize any of the following kinds of signals: | |
4250 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
4251 // It should be consulted by handlers for any of those signals. | |
4252 // | |
4253 // The caller of this routine must pass in the three arguments supplied | |
4254 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
4255 // field of the structure passed to sigaction(). This routine assumes that | |
4256 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
4257 // | |
4258 // Note that the VM will print warnings if it detects conflicting signal | |
4259 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
4260 // | |
2191 | 4261 extern "C" JNIEXPORT int |
0 | 4262 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
4263 void* ucontext, int abort_if_unrecognized); | |
4264 | |
4265 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
4266 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 4267 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 4268 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 4269 errno = orig_errno; |
0 | 4270 } |
4271 | |
4272 | |
4273 // This boolean allows users to forward their own non-matching signals | |
4274 // to JVM_handle_linux_signal, harmlessly. | |
4275 bool os::Linux::signal_handlers_are_installed = false; | |
4276 | |
4277 // For signal-chaining | |
4278 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
4279 unsigned int os::Linux::sigs = 0; | |
4280 bool os::Linux::libjsig_is_loaded = false; | |
4281 typedef struct sigaction *(*get_signal_t)(int); | |
4282 get_signal_t os::Linux::get_signal_action = NULL; | |
4283 | |
4284 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
4285 struct sigaction *actp = NULL; | |
4286 | |
4287 if (libjsig_is_loaded) { | |
4288 // Retrieve the old signal handler from libjsig | |
4289 actp = (*get_signal_action)(sig); | |
4290 } | |
4291 if (actp == NULL) { | |
4292 // Retrieve the preinstalled signal handler from jvm | |
4293 actp = get_preinstalled_handler(sig); | |
4294 } | |
4295 | |
4296 return actp; | |
4297 } | |
4298 | |
4299 static bool call_chained_handler(struct sigaction *actp, int sig, | |
4300 siginfo_t *siginfo, void *context) { | |
4301 // Call the old signal handler | |
4302 if (actp->sa_handler == SIG_DFL) { | |
4303 // It's more reasonable to let jvm treat it as an unexpected exception | |
4304 // instead of taking the default action. | |
4305 return false; | |
4306 } else if (actp->sa_handler != SIG_IGN) { | |
4307 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
4308 // automaticlly block the signal | |
4309 sigaddset(&(actp->sa_mask), sig); | |
4310 } | |
4311 | |
4312 sa_handler_t hand; | |
4313 sa_sigaction_t sa; | |
4314 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
4315 // retrieve the chained handler | |
4316 if (siginfo_flag_set) { | |
4317 sa = actp->sa_sigaction; | |
4318 } else { | |
4319 hand = actp->sa_handler; | |
4320 } | |
4321 | |
4322 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
4323 actp->sa_handler = SIG_DFL; | |
4324 } | |
4325 | |
4326 // try to honor the signal mask | |
4327 sigset_t oset; | |
4328 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
4329 | |
4330 // call into the chained handler | |
4331 if (siginfo_flag_set) { | |
4332 (*sa)(sig, siginfo, context); | |
4333 } else { | |
4334 (*hand)(sig); | |
4335 } | |
4336 | |
4337 // restore the signal mask | |
4338 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
4339 } | |
4340 // Tell jvm's signal handler the signal is taken care of. | |
4341 return true; | |
4342 } | |
4343 | |
4344 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
4345 bool chained = false; | |
4346 // signal-chaining | |
4347 if (UseSignalChaining) { | |
4348 struct sigaction *actp = get_chained_signal_action(sig); | |
4349 if (actp != NULL) { | |
4350 chained = call_chained_handler(actp, sig, siginfo, context); | |
4351 } | |
4352 } | |
4353 return chained; | |
4354 } | |
4355 | |
4356 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
4357 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
4358 return &sigact[sig]; | |
4359 } | |
4360 return NULL; | |
4361 } | |
4362 | |
4363 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
4364 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4365 sigact[sig] = oldAct; | |
4366 sigs |= (unsigned int)1 << sig; | |
4367 } | |
4368 | |
4369 // for diagnostic | |
4370 int os::Linux::sigflags[MAXSIGNUM]; | |
4371 | |
4372 int os::Linux::get_our_sigflags(int sig) { | |
4373 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4374 return sigflags[sig]; | |
4375 } | |
4376 | |
4377 void os::Linux::set_our_sigflags(int sig, int flags) { | |
4378 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4379 sigflags[sig] = flags; | |
4380 } | |
4381 | |
4382 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
4383 // Check for overwrite. | |
4384 struct sigaction oldAct; | |
4385 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
4386 | |
4387 void* oldhand = oldAct.sa_sigaction | |
4388 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4389 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4390 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
4391 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
4392 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
4393 if (AllowUserSignalHandlers || !set_installed) { | |
4394 // Do not overwrite; user takes responsibility to forward to us. | |
4395 return; | |
4396 } else if (UseSignalChaining) { | |
4397 // save the old handler in jvm | |
4398 save_preinstalled_handler(sig, oldAct); | |
4399 // libjsig also interposes the sigaction() call below and saves the | |
4400 // old sigaction on it own. | |
4401 } else { | |
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|
4402 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
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|
4403 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 4404 } |
4405 } | |
4406 | |
4407 struct sigaction sigAct; | |
4408 sigfillset(&(sigAct.sa_mask)); | |
4409 sigAct.sa_handler = SIG_DFL; | |
4410 if (!set_installed) { | |
4411 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4412 } else { | |
4413 sigAct.sa_sigaction = signalHandler; | |
4414 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4415 } | |
4416 // Save flags, which are set by ours | |
4417 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4418 sigflags[sig] = sigAct.sa_flags; | |
4419 | |
4420 int ret = sigaction(sig, &sigAct, &oldAct); | |
4421 assert(ret == 0, "check"); | |
4422 | |
4423 void* oldhand2 = oldAct.sa_sigaction | |
4424 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4425 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4426 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
4427 } | |
4428 | |
4429 // install signal handlers for signals that HotSpot needs to | |
4430 // handle in order to support Java-level exception handling. | |
4431 | |
4432 void os::Linux::install_signal_handlers() { | |
4433 if (!signal_handlers_are_installed) { | |
4434 signal_handlers_are_installed = true; | |
4435 | |
4436 // signal-chaining | |
4437 typedef void (*signal_setting_t)(); | |
4438 signal_setting_t begin_signal_setting = NULL; | |
4439 signal_setting_t end_signal_setting = NULL; | |
4440 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4441 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
4442 if (begin_signal_setting != NULL) { | |
4443 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4444 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
4445 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
4446 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
4447 libjsig_is_loaded = true; | |
4448 assert(UseSignalChaining, "should enable signal-chaining"); | |
4449 } | |
4450 if (libjsig_is_loaded) { | |
4451 // Tell libjsig jvm is setting signal handlers | |
4452 (*begin_signal_setting)(); | |
4453 } | |
4454 | |
4455 set_signal_handler(SIGSEGV, true); | |
4456 set_signal_handler(SIGPIPE, true); | |
4457 set_signal_handler(SIGBUS, true); | |
4458 set_signal_handler(SIGILL, true); | |
4459 set_signal_handler(SIGFPE, true); | |
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|
4460 #if defined(PPC64) |
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|
4461 set_signal_handler(SIGTRAP, true); |
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|
4462 #endif |
0 | 4463 set_signal_handler(SIGXFSZ, true); |
4464 | |
4465 if (libjsig_is_loaded) { | |
4466 // Tell libjsig jvm finishes setting signal handlers | |
4467 (*end_signal_setting)(); | |
4468 } | |
4469 | |
4470 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
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4471 // and if UserSignalHandler is installed all bets are off. |
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4472 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 4473 if (CheckJNICalls) { |
4474 if (libjsig_is_loaded) { | |
3956
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|
4475 if (PrintJNIResolving) { |
3607aac85aa9
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|
4476 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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|
4477 } |
0 | 4478 check_signals = false; |
4479 } | |
4480 if (AllowUserSignalHandlers) { | |
3956
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3913
diff
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|
4481 if (PrintJNIResolving) { |
3607aac85aa9
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|
4482 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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|
4483 } |
0 | 4484 check_signals = false; |
4485 } | |
4486 } | |
4487 } | |
4488 } | |
4489 | |
4490 // This is the fastest way to get thread cpu time on Linux. | |
4491 // Returns cpu time (user+sys) for any thread, not only for current. | |
4492 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
4493 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4494 // For reference, please, see IEEE Std 1003.1-2004: | |
4495 // http://www.unix.org/single_unix_specification | |
4496 | |
4497 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4498 struct timespec tp; | |
4499 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4500 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4501 | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4082
diff
changeset
|
4502 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4503 } |
4504 | |
4505 ///// | |
4506 // glibc on Linux platform uses non-documented flag | |
4507 // to indicate, that some special sort of signal | |
4508 // trampoline is used. | |
4509 // We will never set this flag, and we should | |
4510 // ignore this flag in our diagnostic | |
4511 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4512 #undef SIGNIFICANT_SIGNAL_MASK | |
4513 #endif | |
4514 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4515 | |
4516 static const char* get_signal_handler_name(address handler, | |
4517 char* buf, int buflen) { | |
4518 int offset; | |
4519 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
4520 if (found) { | |
4521 // skip directory names | |
4522 const char *p1, *p2; | |
4523 p1 = buf; | |
4524 size_t len = strlen(os::file_separator()); | |
4525 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4526 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4527 } else { | |
4528 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4529 } | |
4530 return buf; | |
4531 } | |
4532 | |
4533 static void print_signal_handler(outputStream* st, int sig, | |
4534 char* buf, size_t buflen) { | |
4535 struct sigaction sa; | |
4536 | |
4537 sigaction(sig, NULL, &sa); | |
4538 | |
4539 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4540 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4541 | |
4542 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4543 | |
4544 address handler = (sa.sa_flags & SA_SIGINFO) | |
4545 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4546 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4547 | |
4548 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4549 st->print("SIG_DFL"); | |
4550 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4551 st->print("SIG_IGN"); | |
4552 } else { | |
4553 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4554 } | |
4555 | |
14410 | 4556 st->print(", sa_mask[0]="); |
4557 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
0 | 4558 |
4559 address rh = VMError::get_resetted_sighandler(sig); | |
4560 // May be, handler was resetted by VMError? | |
4561 if(rh != NULL) { | |
4562 handler = rh; | |
4563 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4564 } | |
4565 | |
14410 | 4566 st->print(", sa_flags="); |
4567 os::Posix::print_sa_flags(st, sa.sa_flags); | |
0 | 4568 |
4569 // Check: is it our handler? | |
4570 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4571 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4572 // It is our signal handler | |
4573 // check for flags, reset system-used one! | |
4574 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4575 st->print( | |
4576 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4577 os::Linux::get_our_sigflags(sig)); | |
4578 } | |
4579 } | |
4580 st->cr(); | |
4581 } | |
4582 | |
4583 | |
4584 #define DO_SIGNAL_CHECK(sig) \ | |
4585 if (!sigismember(&check_signal_done, sig)) \ | |
4586 os::Linux::check_signal_handler(sig) | |
4587 | |
4588 // This method is a periodic task to check for misbehaving JNI applications | |
4589 // under CheckJNI, we can add any periodic checks here | |
4590 | |
4591 void os::run_periodic_checks() { | |
4592 | |
4593 if (check_signals == false) return; | |
4594 | |
4595 // SEGV and BUS if overridden could potentially prevent | |
4596 // generation of hs*.log in the event of a crash, debugging | |
4597 // such a case can be very challenging, so we absolutely | |
4598 // check the following for a good measure: | |
4599 DO_SIGNAL_CHECK(SIGSEGV); | |
4600 DO_SIGNAL_CHECK(SIGILL); | |
4601 DO_SIGNAL_CHECK(SIGFPE); | |
4602 DO_SIGNAL_CHECK(SIGBUS); | |
4603 DO_SIGNAL_CHECK(SIGPIPE); | |
4604 DO_SIGNAL_CHECK(SIGXFSZ); | |
14432
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
goetz
parents:
14422
diff
changeset
|
4605 #if defined(PPC64) |
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
goetz
parents:
14422
diff
changeset
|
4606 DO_SIGNAL_CHECK(SIGTRAP); |
935bf3340572
8028470: PPC64 (part 214): linux: extend signal handler to catch SIGTRAP on ppc64.
goetz
parents:
14422
diff
changeset
|
4607 #endif |
0 | 4608 |
4609 // ReduceSignalUsage allows the user to override these handlers | |
4610 // see comments at the very top and jvm_solaris.h | |
4611 if (!ReduceSignalUsage) { | |
4612 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4613 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4614 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4615 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4616 } | |
4617 | |
4618 DO_SIGNAL_CHECK(SR_signum); | |
4619 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4620 } | |
4621 | |
4622 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4623 | |
4624 static os_sigaction_t os_sigaction = NULL; | |
4625 | |
4626 void os::Linux::check_signal_handler(int sig) { | |
4627 char buf[O_BUFLEN]; | |
4628 address jvmHandler = NULL; | |
4629 | |
4630 | |
4631 struct sigaction act; | |
4632 if (os_sigaction == NULL) { | |
4633 // only trust the default sigaction, in case it has been interposed | |
4634 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4635 if (os_sigaction == NULL) return; | |
4636 } | |
4637 | |
4638 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4639 | |
4640 | |
4641 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4642 | |
4643 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4644 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4645 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4646 | |
4647 | |
4648 switch(sig) { | |
4649 case SIGSEGV: | |
4650 case SIGBUS: | |
4651 case SIGFPE: | |
4652 case SIGPIPE: | |
4653 case SIGILL: | |
4654 case SIGXFSZ: | |
4655 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4656 break; | |
4657 | |
4658 case SHUTDOWN1_SIGNAL: | |
4659 case SHUTDOWN2_SIGNAL: | |
4660 case SHUTDOWN3_SIGNAL: | |
4661 case BREAK_SIGNAL: | |
4662 jvmHandler = (address)user_handler(); | |
4663 break; | |
4664 | |
4665 case INTERRUPT_SIGNAL: | |
4666 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4667 break; | |
4668 | |
4669 default: | |
4670 if (sig == SR_signum) { | |
4671 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4672 } else { | |
4673 return; | |
4674 } | |
4675 break; | |
4676 } | |
4677 | |
4678 if (thisHandler != jvmHandler) { | |
4679 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4680 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4681 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4682 // No need to check this sig any longer | |
4683 sigaddset(&check_signal_done, sig); | |
4684 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4685 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4686 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4687 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4688 // No need to check this sig any longer | |
4689 sigaddset(&check_signal_done, sig); | |
4690 } | |
4691 | |
4692 // Dump all the signal | |
4693 if (sigismember(&check_signal_done, sig)) { | |
4694 print_signal_handlers(tty, buf, O_BUFLEN); | |
4695 } | |
4696 } | |
4697 | |
4698 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4699 | |
4700 extern bool signal_name(int signo, char* buf, size_t len); | |
4701 | |
4702 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4703 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4704 // signal | |
4705 if (!signal_name(exception_code, buf, size)) { | |
4706 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4707 } | |
4708 return buf; | |
4709 } else { | |
4710 return NULL; | |
4711 } | |
4712 } | |
4713 | |
4714 // this is called _before_ the most of global arguments have been parsed | |
4715 void os::init(void) { | |
4716 char dummy; /* used to get a guess on initial stack address */ | |
4717 // first_hrtime = gethrtime(); | |
4718 | |
4719 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4720 // is different than the pid of the java launcher thread. | |
4721 // So, on Linux, the launcher thread pid is passed to the VM | |
4722 // via the sun.java.launcher.pid property. | |
4723 // Use this property instead of getpid() if it was correctly passed. | |
4724 // See bug 6351349. | |
4725 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4726 | |
4727 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4728 | |
4729 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4730 | |
4731 init_random(1234567); | |
4732 | |
4733 ThreadCritical::initialize(); | |
4734 | |
4735 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4736 if (Linux::page_size() == -1) { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4737 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4738 strerror(errno))); |
0 | 4739 } |
4740 init_page_sizes((size_t) Linux::page_size()); | |
4741 | |
4742 Linux::initialize_system_info(); | |
4743 | |
4744 // main_thread points to the aboriginal thread | |
4745 Linux::_main_thread = pthread_self(); | |
4746 | |
4747 Linux::clock_init(); | |
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12840
diff
changeset
|
4748 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
|
4749 |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4750 // 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
|
4751 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
|
4752 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
|
4753 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
|
4754 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
|
4755 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4756 // 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
|
4757 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
|
4758 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
|
4759 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
|
4760 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
|
4761 " - 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
|
4762 } 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
|
4763 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
|
4764 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4765 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4766 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4767 // 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
|
4768 |
242 | 4769 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
|
4770 |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4771 // 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
|
4772 // 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
|
4773 // 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
|
4774 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
|
4775 StackYellowPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4776 StackRedPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4777 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
|
4778 } |
0 | 4779 } |
4780 | |
4781 // To install functions for atexit system call | |
4782 extern "C" { | |
4783 static void perfMemory_exit_helper() { | |
4784 perfMemory_exit(); | |
4785 } | |
4786 } | |
4787 | |
4788 // this is called _after_ the global arguments have been parsed | |
4789 jint os::init_2(void) | |
4790 { | |
4791 Linux::fast_thread_clock_init(); | |
4792 | |
4793 // Allocate a single page and mark it as readable for safepoint polling | |
4794 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4795 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4796 | |
4797 os::set_polling_page( polling_page ); | |
4798 | |
4799 #ifndef PRODUCT | |
4800 if(Verbose && PrintMiscellaneous) | |
4801 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4802 #endif | |
4803 | |
4804 if (!UseMembar) { | |
4805 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
|
4806 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
0 | 4807 os::set_memory_serialize_page( mem_serialize_page ); |
4808 | |
4809 #ifndef PRODUCT | |
4810 if(Verbose && PrintMiscellaneous) | |
4811 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4812 #endif | |
4813 } | |
4814 | |
4815 // initialize suspend/resume support - must do this before signal_sets_init() | |
4816 if (SR_initialize() != 0) { | |
4817 perror("SR_initialize failed"); | |
4818 return JNI_ERR; | |
4819 } | |
4820 | |
4821 Linux::signal_sets_init(); | |
4822 Linux::install_signal_handlers(); | |
4823 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4824 // 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
|
4825 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4826 // 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
|
4827 // 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
|
4828 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4829 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
|
4830 (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
|
4831 (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
|
4832 |
0 | 4833 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4834 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4835 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4836 tty->print_cr("\nThe stack size specified is too small, " |
4837 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4838 os::Linux::min_stack_allowed/ K); |
0 | 4839 return JNI_ERR; |
4840 } | |
4841 | |
4842 // Make the stack size a multiple of the page size so that | |
4843 // the yellow/red zones can be guarded. | |
4844 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4845 vm_page_size())); | |
4846 | |
4847 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4848 | |
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
|
4849 #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
|
4850 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
|
4851 #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
|
4852 |
0 | 4853 Linux::libpthread_init(); |
4854 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4855 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4856 Linux::glibc_version(), Linux::libpthread_version(), | |
4857 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4858 } | |
4859 | |
141 | 4860 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4861 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
|
4862 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4863 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4864 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
|
4865 // 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
|
4866 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4867 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4868 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4869 // 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
|
4870 // 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
|
4871 // 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
|
4872 // disable adaptive resizing. |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4873 if (UseNUMA && UseLargePages && !can_commit_large_page_memory()) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4874 if (FLAG_IS_DEFAULT(UseNUMA)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4875 UseNUMA = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4876 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4877 if (FLAG_IS_DEFAULT(UseLargePages) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4878 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4879 FLAG_IS_DEFAULT(UseHugeTLBFS)) { |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4880 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4881 } else { |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4882 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
|
4883 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4884 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4885 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4886 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4887 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4888 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4889 UseNUMA = true; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4890 } |
141 | 4891 } |
4892 | |
0 | 4893 if (MaxFDLimit) { |
4894 // set the number of file descriptors to max. print out error | |
4895 // if getrlimit/setrlimit fails but continue regardless. | |
4896 struct rlimit nbr_files; | |
4897 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4898 if (status != 0) { | |
4899 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4900 perror("os::init_2 getrlimit failed"); | |
4901 } else { | |
4902 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4903 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4904 if (status != 0) { | |
4905 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4906 perror("os::init_2 setrlimit failed"); | |
4907 } | |
4908 } | |
4909 } | |
4910 | |
4911 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4912 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4913 | |
4914 // at-exit methods are called in the reverse order of their registration. | |
4915 // atexit functions are called on return from main or as a result of a | |
4916 // call to exit(3C). There can be only 32 of these functions registered | |
4917 // and atexit() does not set errno. | |
4918 | |
4919 if (PerfAllowAtExitRegistration) { | |
4920 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4921 // atexit functions can be delayed until process exit time, which | |
4922 // can be problematic for embedded VM situations. Embedded VMs should | |
4923 // call DestroyJavaVM() to assure that VM resources are released. | |
4924 | |
4925 // note: perfMemory_exit_helper atexit function may be removed in | |
4926 // the future if the appropriate cleanup code can be added to the | |
4927 // VM_Exit VMOperation's doit method. | |
4928 if (atexit(perfMemory_exit_helper) != 0) { | |
14391 | 4929 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
0 | 4930 } |
4931 } | |
4932 | |
4933 // initialize thread priority policy | |
4934 prio_init(); | |
4935 | |
4936 return JNI_OK; | |
4937 } | |
4938 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4939 // this is called at the end of vm_initialization |
14391 | 4940 void os::init_3(void) { |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4941 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4942 // Start the MemNotifyThread |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4943 if (LowMemoryProtection) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4944 MemNotifyThread::start(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4945 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4946 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4947 #endif |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4948 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4949 |
0 | 4950 // Mark the polling page as unreadable |
4951 void os::make_polling_page_unreadable(void) { | |
4952 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4953 fatal("Could not disable polling page"); | |
4954 }; | |
4955 | |
4956 // Mark the polling page as readable | |
4957 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4958 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4959 fatal("Could not enable polling page"); |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4960 } |
0 | 4961 }; |
4962 | |
4963 int os::active_processor_count() { | |
4964 // Linux doesn't yet have a (official) notion of processor sets, | |
4965 // so just return the number of online processors. | |
4966 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4967 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4968 return online_cpus; | |
4969 } | |
4970 | |
4006 | 4971 void os::set_native_thread_name(const char *name) { |
4972 // Not yet implemented. | |
4973 return; | |
4974 } | |
4975 | |
0 | 4976 bool os::distribute_processes(uint length, uint* distribution) { |
4977 // Not yet implemented. | |
4978 return false; | |
4979 } | |
4980 | |
4981 bool os::bind_to_processor(uint processor_id) { | |
4982 // Not yet implemented. | |
4983 return false; | |
4984 } | |
4985 | |
4986 /// | |
4987 | |
10405 | 4988 void os::SuspendedThreadTask::internal_do_task() { |
4989 if (do_suspend(_thread->osthread())) { | |
4990 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
4991 do_task(context); | |
4992 do_resume(_thread->osthread()); | |
4993 } | |
4994 } | |
4995 | |
4996 class PcFetcher : public os::SuspendedThreadTask { | |
4997 public: | |
4998 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
4999 ExtendedPC result(); | |
5000 protected: | |
5001 void do_task(const os::SuspendedThreadTaskContext& context); | |
5002 private: | |
5003 ExtendedPC _epc; | |
5004 }; | |
5005 | |
5006 ExtendedPC PcFetcher::result() { | |
5007 guarantee(is_done(), "task is not done yet."); | |
5008 return _epc; | |
5009 } | |
5010 | |
5011 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
5012 Thread* thread = context.thread(); | |
5013 OSThread* osthread = thread->osthread(); | |
5014 if (osthread->ucontext() != NULL) { | |
5015 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
5016 } else { | |
5017 // NULL context is unexpected, double-check this is the VMThread | |
5018 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
5019 } | |
5020 } | |
5021 | |
0 | 5022 // Suspends the target using the signal mechanism and then grabs the PC before |
5023 // resuming the target. Used by the flat-profiler only | |
5024 ExtendedPC os::get_thread_pc(Thread* thread) { | |
5025 // Make sure that it is called by the watcher for the VMThread | |
5026 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
5027 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
5028 | |
10405 | 5029 PcFetcher fetcher(thread); |
5030 fetcher.run(); | |
5031 return fetcher.result(); | |
0 | 5032 } |
5033 | |
5034 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
5035 { | |
5036 if (is_NPTL()) { | |
5037 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5038 } else { | |
5039 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
5040 // word back to default 64bit precision if condvar is signaled. Java | |
5041 // wants 53bit precision. Save and restore current value. | |
5042 int fpu = get_fpu_control_word(); | |
5043 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5044 set_fpu_control_word(fpu); | |
5045 return status; | |
5046 } | |
5047 } | |
5048 | |
5049 //////////////////////////////////////////////////////////////////////////////// | |
5050 // debug support | |
5051 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5052 bool os::find(address addr, outputStream* st) { |
0 | 5053 Dl_info dlinfo; |
5054 memset(&dlinfo, 0, sizeof(dlinfo)); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5055 if (dladdr(addr, &dlinfo) != 0) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5056 st->print(PTR_FORMAT ": ", addr); |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5057 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5058 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 5059 addr - (intptr_t)dlinfo.dli_saddr); |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5060 } else if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5061 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 5062 } else { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5063 st->print("<absolute address>"); |
0 | 5064 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5065 if (dlinfo.dli_fname != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5066 st->print(" in %s", dlinfo.dli_fname); |
0 | 5067 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5068 if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5069 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 5070 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5071 st->cr(); |
0 | 5072 |
5073 if (Verbose) { | |
5074 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
5075 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
5076 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 5077 address lowest = (address) dlinfo.dli_sname; |
5078 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
5079 if (begin < lowest) begin = lowest; | |
5080 Dl_info dlinfo2; | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5081 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
0 | 5082 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
5083 end = (address) dlinfo2.dli_saddr; | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5084 Disassembler::decode(begin, end, st); |
0 | 5085 } |
5086 return true; | |
5087 } | |
5088 return false; | |
5089 } | |
5090 | |
5091 //////////////////////////////////////////////////////////////////////////////// | |
5092 // misc | |
5093 | |
5094 // This does not do anything on Linux. This is basically a hook for being | |
5095 // able to use structured exception handling (thread-local exception filters) | |
5096 // on, e.g., Win32. | |
5097 void | |
5098 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
5099 JavaCallArguments* args, Thread* thread) { | |
5100 f(value, method, args, thread); | |
5101 } | |
5102 | |
5103 void os::print_statistics() { | |
5104 } | |
5105 | |
5106 int os::message_box(const char* title, const char* message) { | |
5107 int i; | |
5108 fdStream err(defaultStream::error_fd()); | |
5109 for (i = 0; i < 78; i++) err.print_raw("="); | |
5110 err.cr(); | |
5111 err.print_raw_cr(title); | |
5112 for (i = 0; i < 78; i++) err.print_raw("-"); | |
5113 err.cr(); | |
5114 err.print_raw_cr(message); | |
5115 for (i = 0; i < 78; i++) err.print_raw("="); | |
5116 err.cr(); | |
5117 | |
5118 char buf[16]; | |
5119 // Prevent process from exiting upon "read error" without consuming all CPU | |
5120 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
5121 | |
5122 return buf[0] == 'y' || buf[0] == 'Y'; | |
5123 } | |
5124 | |
5125 int os::stat(const char *path, struct stat *sbuf) { | |
5126 char pathbuf[MAX_PATH]; | |
5127 if (strlen(path) > MAX_PATH - 1) { | |
5128 errno = ENAMETOOLONG; | |
5129 return -1; | |
5130 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5131 os::native_path(strcpy(pathbuf, path)); |
0 | 5132 return ::stat(pathbuf, sbuf); |
5133 } | |
5134 | |
5135 bool os::check_heap(bool force) { | |
5136 return true; | |
5137 } | |
5138 | |
5139 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
5140 return ::vsnprintf(buf, count, format, args); | |
5141 } | |
5142 | |
5143 // Is a (classpath) directory empty? | |
5144 bool os::dir_is_empty(const char* path) { | |
5145 DIR *dir = NULL; | |
5146 struct dirent *ptr; | |
5147 | |
5148 dir = opendir(path); | |
5149 if (dir == NULL) return true; | |
5150 | |
5151 /* Scan the directory */ | |
5152 bool result = true; | |
5153 char buf[sizeof(struct dirent) + MAX_PATH]; | |
5154 while (result && (ptr = ::readdir(dir)) != NULL) { | |
5155 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
5156 result = false; | |
5157 } | |
5158 } | |
5159 closedir(dir); | |
5160 return result; | |
5161 } | |
5162 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5163 // This code originates from JDK's sysOpen and open64_w |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5164 // from src/solaris/hpi/src/system_md.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5165 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5166 #ifndef O_DELETE |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5167 #define O_DELETE 0x10000 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5168 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5169 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5170 // Open a file. Unlink the file immediately after open returns |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5171 // if the specified oflag has the O_DELETE flag set. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5172 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5173 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5174 int os::open(const char *path, int oflag, int mode) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5175 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5176 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5177 errno = ENAMETOOLONG; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5178 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5179 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5180 int fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5181 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5182 oflag = oflag & ~O_DELETE; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5183 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5184 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5185 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5186 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5187 //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
|
5188 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5189 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5190 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5191 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5192 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5193 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5194 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5195 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5196 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5197 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5198 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5199 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5200 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5201 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5202 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5203 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5204 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5205 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5206 * All file descriptors that are opened in the JVM and not |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5207 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5208 * close-on-exec flag set. If we don't set it, then careless 3rd |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5209 * party native code might fork and exec without closing all |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5210 * appropriate file descriptors (e.g. as we do in closeDescriptors in |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5211 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5212 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5213 * - cause end-of-file to fail to be detected on some file |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5214 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5215 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5216 * - might cause an fopen in the subprocess to fail on a system |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5217 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5218 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5219 * (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:
1972
diff
changeset
|
5220 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5221 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5222 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5223 * 1085341: 32-bit stdio routines should support file descriptors >255 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5224 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5225 * 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:
1972
diff
changeset
|
5226 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5227 #ifdef FD_CLOEXEC |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5228 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5229 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5230 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5231 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5232 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5233 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5234 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5235 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5236 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5237 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5238 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5239 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5240 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5241 |
0 | 5242 // create binary file, rewriting existing file if required |
5243 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
5244 int oflags = O_WRONLY | O_CREAT; | |
5245 if (!rewrite_existing) { | |
5246 oflags |= O_EXCL; | |
5247 } | |
5248 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
5249 } | |
5250 | |
5251 // return current position of file pointer | |
5252 jlong os::current_file_offset(int fd) { | |
5253 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
5254 } | |
5255 | |
5256 // move file pointer to the specified offset | |
5257 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
5258 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
5259 } | |
5260 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5261 // This code originates from JDK's sysAvailable |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5262 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5263 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5264 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5265 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5266 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5267 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5268 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5269 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5270 mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5271 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5272 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5273 * XXX: is the following call interruptible? If so, this might |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5274 * 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
|
5275 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5276 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5277 int n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5278 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5279 *bytes = n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5280 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5281 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5282 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5283 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5284 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5285 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5286 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5287 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5288 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5289 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5290 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5291 *bytes = end - cur; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5292 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5293 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5294 |
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5295 int os::socket_available(int fd, jint *pbytes) { |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5296 // Linux doc says EINTR not returned, unlike Solaris |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5297 int ret = ::ioctl(fd, FIONREAD, pbytes); |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5298 |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5299 //%% 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
|
5300 // 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
parents:
2023
diff
changeset
|
5301 return (ret < 0) ? 0 : 1; |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5302 } |
03e1b9fce89d
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diff
changeset
|
5303 |
0 | 5304 // Map a block of memory. |
6197 | 5305 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5306 char *addr, size_t bytes, bool read_only, |
5307 bool allow_exec) { | |
5308 int prot; | |
5909 | 5309 int flags = MAP_PRIVATE; |
0 | 5310 |
5311 if (read_only) { | |
5312 prot = PROT_READ; | |
5313 } else { | |
5314 prot = PROT_READ | PROT_WRITE; | |
5315 } | |
5316 | |
5317 if (allow_exec) { | |
5318 prot |= PROT_EXEC; | |
5319 } | |
5320 | |
5321 if (addr != NULL) { | |
5322 flags |= MAP_FIXED; | |
5323 } | |
5324 | |
5325 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
5326 fd, file_offset); | |
5327 if (mapped_address == MAP_FAILED) { | |
5328 return NULL; | |
5329 } | |
5330 return mapped_address; | |
5331 } | |
5332 | |
5333 | |
5334 // Remap a block of memory. | |
6197 | 5335 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5336 char *addr, size_t bytes, bool read_only, |
5337 bool allow_exec) { | |
5338 // same as map_memory() on this OS | |
5339 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
5340 allow_exec); | |
5341 } | |
5342 | |
5343 | |
5344 // Unmap a block of memory. | |
6197 | 5345 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 5346 return munmap(addr, bytes) == 0; |
5347 } | |
5348 | |
5349 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
5350 | |
5351 static clockid_t thread_cpu_clockid(Thread* thread) { | |
5352 pthread_t tid = thread->osthread()->pthread_id(); | |
5353 clockid_t clockid; | |
5354 | |
5355 // Get thread clockid | |
5356 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
5357 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
5358 return clockid; | |
5359 } | |
5360 | |
5361 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
5362 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
5363 // of a thread. | |
5364 // | |
5365 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
5366 // the fast estimate available on the platform. | |
5367 | |
5368 jlong os::current_thread_cpu_time() { | |
5369 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5370 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5371 } else { | |
5372 // return user + sys since the cost is the same | |
5373 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
5374 } | |
5375 } | |
5376 | |
5377 jlong os::thread_cpu_time(Thread* thread) { | |
5378 // consistent with what current_thread_cpu_time() returns | |
5379 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5380 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5381 } else { | |
5382 return slow_thread_cpu_time(thread, true /* user + sys */); | |
5383 } | |
5384 } | |
5385 | |
5386 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
5387 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5388 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5389 } else { | |
5390 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
5391 } | |
5392 } | |
5393 | |
5394 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5395 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5396 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5397 } else { | |
5398 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
5399 } | |
5400 } | |
5401 | |
5402 // | |
5403 // -1 on error. | |
5404 // | |
5405 | |
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|
5406 PRAGMA_DIAG_PUSH |
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|
5407 PRAGMA_FORMAT_NONLITERAL_IGNORED |
0 | 5408 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { |
5409 static bool proc_task_unchecked = true; | |
5410 static const char *proc_stat_path = "/proc/%d/stat"; | |
5411 pid_t tid = thread->osthread()->thread_id(); | |
5412 char *s; | |
5413 char stat[2048]; | |
5414 int statlen; | |
5415 char proc_name[64]; | |
5416 int count; | |
5417 long sys_time, user_time; | |
1681
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|
5418 char cdummy; |
0 | 5419 int idummy; |
5420 long ldummy; | |
5421 FILE *fp; | |
5422 | |
5423 // The /proc/<tid>/stat aggregates per-process usage on | |
5424 // new Linux kernels 2.6+ where NPTL is supported. | |
5425 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
5426 // See bug 6328462. | |
8099
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diff
changeset
|
5427 // There possibly can be cases where there is no directory |
4c1d8002ffb1
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changeset
|
5428 // /proc/self/task, so we check its availability. |
0 | 5429 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
5430 // This is executed only once | |
5431 proc_task_unchecked = false; | |
5432 fp = fopen("/proc/self/task", "r"); | |
5433 if (fp != NULL) { | |
5434 proc_stat_path = "/proc/self/task/%d/stat"; | |
5435 fclose(fp); | |
5436 } | |
5437 } | |
5438 | |
5439 sprintf(proc_name, proc_stat_path, tid); | |
5440 fp = fopen(proc_name, "r"); | |
5441 if ( fp == NULL ) return -1; | |
5442 statlen = fread(stat, 1, 2047, fp); | |
5443 stat[statlen] = '\0'; | |
5444 fclose(fp); | |
5445 | |
5446 // Skip pid and the command string. Note that we could be dealing with | |
5447 // weird command names, e.g. user could decide to rename java launcher | |
5448 // to "java 1.4.2 :)", then the stat file would look like | |
5449 // 1234 (java 1.4.2 :)) R ... ... | |
5450 // We don't really need to know the command string, just find the last | |
5451 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
5452 s = strrchr(stat, ')'); | |
5453 if (s == NULL ) return -1; | |
5454 | |
5455 // Skip blank chars | |
5456 do s++; while (isspace(*s)); | |
5457 | |
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bobv
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|
5458 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
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|
5459 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 5460 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
5461 &user_time, &sys_time); | |
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|
5462 if ( count != 13 ) return -1; |
0 | 5463 if (user_sys_cpu_time) { |
5464 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
5465 } else { | |
5466 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
5467 } | |
5468 } | |
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|
5469 PRAGMA_DIAG_POP |
0 | 5470 |
5471 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5472 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5473 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5474 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5475 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5476 } | |
5477 | |
5478 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5479 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5480 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5481 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5482 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5483 } | |
5484 | |
5485 bool os::is_thread_cpu_time_supported() { | |
5486 return true; | |
5487 } | |
5488 | |
5489 // System loadavg support. Returns -1 if load average cannot be obtained. | |
5490 // Linux doesn't yet have a (official) notion of processor sets, | |
5491 // so just return the system wide load average. | |
5492 int os::loadavg(double loadavg[], int nelem) { | |
5493 return ::getloadavg(loadavg, nelem); | |
5494 } | |
5495 | |
5496 void os::pause() { | |
5497 char filename[MAX_PATH]; | |
5498 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
5499 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
5500 } else { | |
5501 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
5502 } | |
5503 | |
5504 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
5505 if (fd != -1) { | |
5506 struct stat buf; | |
1980
828eafbd85cc
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diff
changeset
|
5507 ::close(fd); |
0 | 5508 while (::stat(filename, &buf) == 0) { |
5509 (void)::poll(NULL, 0, 100); | |
5510 } | |
5511 } else { | |
5512 jio_fprintf(stderr, | |
5513 "Could not open pause file '%s', continuing immediately.\n", filename); | |
5514 } | |
5515 } | |
5516 | |
5517 | |
5518 // Refer to the comments in os_solaris.cpp park-unpark. | |
5519 // | |
5520 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
5521 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
5522 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
5523 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
5524 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
5525 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
5526 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
5527 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
5528 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
5529 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
5530 // of libpthread avoids the problem, but isn't practical. | |
5531 // | |
5532 // Possible remedies: | |
5533 // | |
5534 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
5535 // This is palliative and probabilistic, however. If the thread is preempted | |
5536 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
5537 // than the minimum period may have passed, and the abstime may be stale (in the | |
5538 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
5539 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
5540 // | |
5541 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
5542 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
5543 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
5544 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
5545 // thread. | |
5546 // | |
5547 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
5548 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
5549 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
5550 // This also works well. In fact it avoids kernel-level scalability impediments | |
5551 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
5552 // timers in a graceful fashion. | |
5553 // | |
5554 // 4. When the abstime value is in the past it appears that control returns | |
5555 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5556 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5557 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5558 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5559 // It may be possible to avoid reinitialization by checking the return | |
5560 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5561 // condvar we must establish the invariant that cond_signal() is only called | |
5562 // within critical sections protected by the adjunct mutex. This prevents | |
5563 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5564 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5565 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5566 // | |
5567 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5568 // structure when a condvar is used or initialized. cond_destroy() would | |
5569 // release the helper structure. Our reinitialize-after-timedwait fix | |
5570 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5571 // | |
5572 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5573 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5574 // and only enabling the work-around for vulnerable environments. | |
5575 | |
5576 // utility to compute the abstime argument to timedwait: | |
5577 // millis is the relative timeout time | |
5578 // abstime will be the absolute timeout time | |
5579 // TODO: replace compute_abstime() with unpackTime() | |
5580 | |
5581 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5582 if (millis < 0) millis = 0; | |
12211
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|
5583 |
0 | 5584 jlong seconds = millis / 1000; |
5585 millis %= 1000; | |
5586 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5587 seconds = 50000000; | |
5588 } | |
12211
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5589 |
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|
5590 if (os::Linux::supports_monotonic_clock()) { |
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changeset
|
5591 struct timespec now; |
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changeset
|
5592 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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|
5593 assert_status(status == 0, status, "clock_gettime"); |
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5594 abstime->tv_sec = now.tv_sec + seconds; |
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5595 long nanos = now.tv_nsec + millis * NANOSECS_PER_MILLISEC; |
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|
5596 if (nanos >= NANOSECS_PER_SEC) { |
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|
5597 abstime->tv_sec += 1; |
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|
5598 nanos -= NANOSECS_PER_SEC; |
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|
5599 } |
2e6938dd68f2
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changeset
|
5600 abstime->tv_nsec = nanos; |
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|
5601 } else { |
2e6938dd68f2
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diff
changeset
|
5602 struct timeval now; |
2e6938dd68f2
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changeset
|
5603 int status = gettimeofday(&now, NULL); |
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changeset
|
5604 assert(status == 0, "gettimeofday"); |
2e6938dd68f2
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changeset
|
5605 abstime->tv_sec = now.tv_sec + seconds; |
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changeset
|
5606 long usec = now.tv_usec + millis * 1000; |
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changeset
|
5607 if (usec >= 1000000) { |
2e6938dd68f2
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diff
changeset
|
5608 abstime->tv_sec += 1; |
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changeset
|
5609 usec -= 1000000; |
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changeset
|
5610 } |
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|
5611 abstime->tv_nsec = usec * 1000; |
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|
5612 } |
0 | 5613 return abstime; |
5614 } | |
5615 | |
5616 | |
5617 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5618 // Conceptually TryPark() should be equivalent to park(0). | |
5619 | |
5620 int os::PlatformEvent::TryPark() { | |
5621 for (;;) { | |
5622 const int v = _Event ; | |
5623 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5624 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5625 } | |
5626 } | |
5627 | |
5628 void os::PlatformEvent::park() { // AKA "down()" | |
5629 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5630 // may call park(). | |
5631 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5632 int v ; | |
5633 for (;;) { | |
5634 v = _Event ; | |
5635 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5636 } | |
5637 guarantee (v >= 0, "invariant") ; | |
5638 if (v == 0) { | |
5639 // Do this the hard way by blocking ... | |
5640 int status = pthread_mutex_lock(_mutex); | |
5641 assert_status(status == 0, status, "mutex_lock"); | |
5642 guarantee (_nParked == 0, "invariant") ; | |
5643 ++ _nParked ; | |
5644 while (_Event < 0) { | |
5645 status = pthread_cond_wait(_cond, _mutex); | |
5646 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5647 // Treat this the same as if the wait was interrupted | |
5648 if (status == ETIME) { status = EINTR; } | |
5649 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5650 } | |
5651 -- _nParked ; | |
5652 | |
5653 _Event = 0 ; | |
5654 status = pthread_mutex_unlock(_mutex); | |
5655 assert_status(status == 0, status, "mutex_unlock"); | |
7629
22ba8c8ce6a6
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7456
diff
changeset
|
5656 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
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7456
diff
changeset
|
5657 // correctly with each other. |
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5658 OrderAccess::fence(); |
0 | 5659 } |
5660 guarantee (_Event >= 0, "invariant") ; | |
5661 } | |
5662 | |
5663 int os::PlatformEvent::park(jlong millis) { | |
5664 guarantee (_nParked == 0, "invariant") ; | |
5665 | |
5666 int v ; | |
5667 for (;;) { | |
5668 v = _Event ; | |
5669 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5670 } | |
5671 guarantee (v >= 0, "invariant") ; | |
5672 if (v != 0) return OS_OK ; | |
5673 | |
5674 // We do this the hard way, by blocking the thread. | |
5675 // Consider enforcing a minimum timeout value. | |
5676 struct timespec abst; | |
5677 compute_abstime(&abst, millis); | |
5678 | |
5679 int ret = OS_TIMEOUT; | |
5680 int status = pthread_mutex_lock(_mutex); | |
5681 assert_status(status == 0, status, "mutex_lock"); | |
5682 guarantee (_nParked == 0, "invariant") ; | |
5683 ++_nParked ; | |
5684 | |
5685 // Object.wait(timo) will return because of | |
5686 // (a) notification | |
5687 // (b) timeout | |
5688 // (c) thread.interrupt | |
5689 // | |
5690 // Thread.interrupt and object.notify{All} both call Event::set. | |
5691 // That is, we treat thread.interrupt as a special case of notification. | |
5692 // The underlying Solaris implementation, cond_timedwait, admits | |
5693 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5694 // JVM from making those visible to Java code. As such, we must | |
5695 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5696 // | |
5697 // TODO: properly differentiate simultaneous notify+interrupt. | |
5698 // In that case, we should propagate the notify to another waiter. | |
5699 | |
5700 while (_Event < 0) { | |
5701 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5702 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5703 pthread_cond_destroy (_cond); | |
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5704 pthread_cond_init (_cond, os::Linux::condAttr()) ; |
0 | 5705 } |
5706 assert_status(status == 0 || status == EINTR || | |
5707 status == ETIME || status == ETIMEDOUT, | |
5708 status, "cond_timedwait"); | |
5709 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5710 if (status == ETIME || status == ETIMEDOUT) break ; | |
5711 // We consume and ignore EINTR and spurious wakeups. | |
5712 } | |
5713 --_nParked ; | |
5714 if (_Event >= 0) { | |
5715 ret = OS_OK; | |
5716 } | |
5717 _Event = 0 ; | |
5718 status = pthread_mutex_unlock(_mutex); | |
5719 assert_status(status == 0, status, "mutex_unlock"); | |
5720 assert (_nParked == 0, "invariant") ; | |
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5721 // Paranoia to ensure our locked and lock-free paths interact |
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5722 // correctly with each other. |
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5723 OrderAccess::fence(); |
0 | 5724 return ret; |
5725 } | |
5726 | |
5727 void os::PlatformEvent::unpark() { | |
7629
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5728 // Transitions for _Event: |
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5729 // 0 :=> 1 |
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5730 // 1 :=> 1 |
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5731 // -1 :=> either 0 or 1; must signal target thread |
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5732 // That is, we can safely transition _Event from -1 to either |
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5733 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5734 // unpark() calls. |
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5735 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5736 // |
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5737 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5738 // that it will take two back-to-back park() calls for the owning |
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5739 // thread to block. This has the benefit of forcing a spurious return |
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5740 // from the first park() call after an unpark() call which will help |
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5741 // shake out uses of park() and unpark() without condition variables. |
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5742 |
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5743 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5744 |
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5745 // Wait for the thread associated with the event to vacate |
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5746 int status = pthread_mutex_lock(_mutex); |
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5747 assert_status(status == 0, status, "mutex_lock"); |
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5748 int AnyWaiters = _nParked; |
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5749 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5750 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5751 AnyWaiters = 0; |
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5752 pthread_cond_signal(_cond); |
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5753 } |
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5754 status = pthread_mutex_unlock(_mutex); |
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5755 assert_status(status == 0, status, "mutex_unlock"); |
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5756 if (AnyWaiters != 0) { |
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5757 status = pthread_cond_signal(_cond); |
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5758 assert_status(status == 0, status, "cond_signal"); |
0 | 5759 } |
5760 | |
5761 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5762 // This is safe and avoids a common class of futile wakeups. In rare | |
5763 // circumstances this can cause a thread to return prematurely from | |
5764 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5765 // simply re-test the condition and re-park itself. | |
5766 } | |
5767 | |
5768 | |
5769 // JSR166 | |
5770 // ------------------------------------------------------- | |
5771 | |
5772 /* | |
5773 * The solaris and linux implementations of park/unpark are fairly | |
5774 * conservative for now, but can be improved. They currently use a | |
5775 * mutex/condvar pair, plus a a count. | |
5776 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5777 * sets count to 1 and signals condvar. Only one thread ever waits | |
5778 * on the condvar. Contention seen when trying to park implies that someone | |
5779 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5780 * is no need to track notifications. | |
5781 */ | |
5782 | |
5783 /* | |
5784 * This code is common to linux and solaris and will be moved to a | |
5785 * common place in dolphin. | |
5786 * | |
5787 * The passed in time value is either a relative time in nanoseconds | |
5788 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5789 * into suitable seconds and nanoseconds components and stored in the | |
5790 * given timespec structure. | |
5791 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5792 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5793 * overflow if times way in the future are given. Further on Solaris versions | |
5794 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5795 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5796 * As it will be 28 years before "now + 100000000" will overflow we can | |
5797 * ignore overflow and just impose a hard-limit on seconds using the value | |
5798 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5799 * years from "now". | |
5800 */ | |
5801 | |
5802 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5803 assert (time > 0, "convertTime"); | |
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5804 time_t max_secs = 0; |
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5805 |
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5806 if (!os::Linux::supports_monotonic_clock() || isAbsolute) { |
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5807 struct timeval now; |
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5808 int status = gettimeofday(&now, NULL); |
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5809 assert(status == 0, "gettimeofday"); |
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5810 |
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5811 max_secs = now.tv_sec + MAX_SECS; |
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5812 |
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5813 if (isAbsolute) { |
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5814 jlong secs = time / 1000; |
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5815 if (secs > max_secs) { |
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5816 absTime->tv_sec = max_secs; |
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5817 } else { |
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5818 absTime->tv_sec = secs; |
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5819 } |
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5820 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; |
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5821 } else { |
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5822 jlong secs = time / NANOSECS_PER_SEC; |
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5823 if (secs >= MAX_SECS) { |
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5824 absTime->tv_sec = max_secs; |
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5825 absTime->tv_nsec = 0; |
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5826 } else { |
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5827 absTime->tv_sec = now.tv_sec + secs; |
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5828 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; |
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5829 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
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5830 absTime->tv_nsec -= NANOSECS_PER_SEC; |
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5831 ++absTime->tv_sec; // note: this must be <= max_secs |
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5832 } |
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5833 } |
0 | 5834 } |
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5835 } else { |
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5836 // must be relative using monotonic clock |
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5837 struct timespec now; |
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5838 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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5839 assert_status(status == 0, status, "clock_gettime"); |
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5840 max_secs = now.tv_sec + MAX_SECS; |
0 | 5841 jlong secs = time / NANOSECS_PER_SEC; |
5842 if (secs >= MAX_SECS) { | |
5843 absTime->tv_sec = max_secs; | |
5844 absTime->tv_nsec = 0; | |
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5845 } else { |
0 | 5846 absTime->tv_sec = now.tv_sec + secs; |
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5847 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_nsec; |
0 | 5848 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
5849 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5850 ++absTime->tv_sec; // note: this must be <= max_secs | |
5851 } | |
5852 } | |
5853 } | |
5854 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5855 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5856 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5857 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5858 } | |
5859 | |
5860 void Parker::park(bool isAbsolute, jlong time) { | |
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5861 // Ideally we'd do something useful while spinning, such |
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5862 // as calling unpackTime(). |
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|
5863 |
0 | 5864 // Optional fast-path check: |
5865 // Return immediately if a permit is available. | |
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5866 // We depend on Atomic::xchg() having full barrier semantics |
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5867 // since we are doing a lock-free update to _counter. |
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|
5868 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5869 |
5870 Thread* thread = Thread::current(); | |
5871 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5872 JavaThread *jt = (JavaThread *)thread; | |
5873 | |
5874 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5875 // Check interrupt before trying to wait | |
5876 if (Thread::is_interrupted(thread, false)) { | |
5877 return; | |
5878 } | |
5879 | |
5880 // Next, demultiplex/decode time arguments | |
5881 timespec absTime; | |
1865
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changeset
|
5882 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5883 return; |
5884 } | |
5885 if (time > 0) { | |
5886 unpackTime(&absTime, isAbsolute, time); | |
5887 } | |
5888 | |
5889 | |
5890 // Enter safepoint region | |
5891 // Beware of deadlocks such as 6317397. | |
5892 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5893 // In particular a thread must never block on the Threads_lock while | |
5894 // holding the Parker:: mutex. If safepoints are pending both the | |
5895 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5896 ThreadBlockInVM tbivm(jt); | |
5897 | |
5898 // Don't wait if cannot get lock since interference arises from | |
5899 // unblocking. Also. check interrupt before trying wait | |
5900 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5901 return; | |
5902 } | |
5903 | |
5904 int status ; | |
5905 if (_counter > 0) { // no wait needed | |
5906 _counter = 0; | |
5907 status = pthread_mutex_unlock(_mutex); | |
5908 assert (status == 0, "invariant") ; | |
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5909 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5910 // 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
|
5911 OrderAccess::fence(); |
0 | 5912 return; |
5913 } | |
5914 | |
5915 #ifdef ASSERT | |
5916 // Don't catch signals while blocked; let the running threads have the signals. | |
5917 // (This allows a debugger to break into the running thread.) | |
5918 sigset_t oldsigs; | |
5919 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5920 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5921 #endif | |
5922 | |
5923 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5924 jt->set_suspend_equivalent(); | |
5925 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5926 | |
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
|
5927 assert(_cur_index == -1, "invariant"); |
0 | 5928 if (time == 0) { |
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
|
5929 _cur_index = REL_INDEX; // arbitrary choice when not timed |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5930 status = pthread_cond_wait (&_cond[_cur_index], _mutex) ; |
0 | 5931 } else { |
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
|
5932 _cur_index = isAbsolute ? ABS_INDEX : REL_INDEX; |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5933 status = os::Linux::safe_cond_timedwait (&_cond[_cur_index], _mutex, &absTime) ; |
0 | 5934 if (status != 0 && WorkAroundNPTLTimedWaitHang) { |
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
|
5935 pthread_cond_destroy (&_cond[_cur_index]) ; |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5936 pthread_cond_init (&_cond[_cur_index], isAbsolute ? NULL : os::Linux::condAttr()); |
0 | 5937 } |
5938 } | |
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
|
5939 _cur_index = -1; |
0 | 5940 assert_status(status == 0 || status == EINTR || |
5941 status == ETIME || status == ETIMEDOUT, | |
5942 status, "cond_timedwait"); | |
5943 | |
5944 #ifdef ASSERT | |
5945 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5946 #endif | |
5947 | |
5948 _counter = 0 ; | |
5949 status = pthread_mutex_unlock(_mutex) ; | |
5950 assert_status(status == 0, status, "invariant") ; | |
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5951 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5952 // correctly with each other and Java-level accesses. |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5953 OrderAccess::fence(); |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5954 |
0 | 5955 // If externally suspended while waiting, re-suspend |
5956 if (jt->handle_special_suspend_equivalent_condition()) { | |
5957 jt->java_suspend_self(); | |
5958 } | |
5959 } | |
5960 | |
5961 void Parker::unpark() { | |
5962 int s, status ; | |
5963 status = pthread_mutex_lock(_mutex); | |
5964 assert (status == 0, "invariant") ; | |
5965 s = _counter; | |
5966 _counter = 1; | |
5967 if (s < 1) { | |
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
|
5968 // thread might be parked |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5969 if (_cur_index != -1) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5970 // thread is definitely parked |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5971 if (WorkAroundNPTLTimedWaitHang) { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5972 status = pthread_cond_signal (&_cond[_cur_index]); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5973 assert (status == 0, "invariant"); |
0 | 5974 status = pthread_mutex_unlock(_mutex); |
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
|
5975 assert (status == 0, "invariant"); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5976 } else { |
0 | 5977 status = pthread_mutex_unlock(_mutex); |
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
|
5978 assert (status == 0, "invariant"); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5979 status = pthread_cond_signal (&_cond[_cur_index]); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5980 assert (status == 0, "invariant"); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5981 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5982 } 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
|
5983 pthread_mutex_unlock(_mutex); |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5984 assert (status == 0, "invariant") ; |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5985 } |
0 | 5986 } else { |
5987 pthread_mutex_unlock(_mutex); | |
5988 assert (status == 0, "invariant") ; | |
5989 } | |
5990 } | |
5991 | |
5992 | |
5993 extern char** environ; | |
5994 | |
5995 #ifndef __NR_fork | |
5996 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
5997 #endif | |
5998 | |
5999 #ifndef __NR_execve | |
6000 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
6001 #endif | |
6002 | |
6003 // Run the specified command in a separate process. Return its exit value, | |
6004 // or -1 on failure (e.g. can't fork a new process). | |
6005 // Unlike system(), this function can be called from signal handler. It | |
6006 // doesn't block SIGINT et al. | |
6007 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
|
6008 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 6009 |
6010 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
6011 // pthread_atfork handlers and reset pthread library. All we need is a | |
6012 // separate process to execve. Make a direct syscall to fork process. | |
6013 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
6014 // the best... | |
6015 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
6016 IA64_ONLY(fork();) | |
6017 | |
6018 if (pid < 0) { | |
6019 // fork failed | |
6020 return -1; | |
6021 | |
6022 } else if (pid == 0) { | |
6023 // child process | |
6024 | |
6025 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
6026 // first to kill every thread on the thread list. Because this list is | |
6027 // not reset by fork() (see notes above), execve() will instead kill | |
6028 // every thread in the parent process. We know this is the only thread | |
6029 // in the new process, so make a system call directly. | |
6030 // IA64 should use normal execve() from glibc to match the glibc fork() | |
6031 // above. | |
6032 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
199
f139919897d2
6681796: hotspot build failure on gcc 4.2.x (ubuntu 8.04) w/ openjdk 6
xlu
parents:
141
diff
changeset
|
6033 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 6034 |
6035 // execve failed | |
6036 _exit(-1); | |
6037 | |
6038 } else { | |
6039 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
6040 // care about the actual exit code, for now. | |
6041 | |
6042 int status; | |
6043 | |
6044 // Wait for the child process to exit. This returns immediately if | |
6045 // the child has already exited. */ | |
6046 while (waitpid(pid, &status, 0) < 0) { | |
6047 switch (errno) { | |
6048 case ECHILD: return 0; | |
6049 case EINTR: break; | |
6050 default: return -1; | |
6051 } | |
6052 } | |
6053 | |
6054 if (WIFEXITED(status)) { | |
6055 // The child exited normally; get its exit code. | |
6056 return WEXITSTATUS(status); | |
6057 } else if (WIFSIGNALED(status)) { | |
6058 // The child exited because of a signal | |
6059 // The best value to return is 0x80 + signal number, | |
6060 // because that is what all Unix shells do, and because | |
6061 // it allows callers to distinguish between process exit and | |
6062 // process death by signal. | |
6063 return 0x80 + WTERMSIG(status); | |
6064 } else { | |
6065 // Unknown exit code; pass it through | |
6066 return status; | |
6067 } | |
6068 } | |
6069 } | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6070 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6071 // is_headless_jre() |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6072 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6073 // 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
|
6074 // 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
|
6075 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6076 // 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
|
6077 // 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
|
6078 // |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6079 bool os::is_headless_jre() { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6080 struct stat statbuf; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6081 char buf[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6082 char libmawtpath[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6083 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
|
6084 const char *new_xawtstr = "/libawt_xawt.so"; |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6085 char *p; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6086 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6087 // Get path to libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6088 os::jvm_path(buf, sizeof(buf)); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6089 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6090 // Get rid of libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6091 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6092 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6093 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6094 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6095 // Get rid of client or server |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6096 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6097 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6098 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6099 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6100 // check xawt/libmawt.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6101 strcpy(libmawtpath, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6102 strcat(libmawtpath, xawtstr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6103 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6104 |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6105 // check libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6106 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
|
6107 strcat(libmawtpath, new_xawtstr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6108 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6109 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6110 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6111 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6112 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6113 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6114 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6115 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
|
6116 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6117 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6118 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6119 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6120 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6121 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6122 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6123 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6124 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6125 |
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6126 #ifdef JAVASE_EMBEDDED |
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6127 // |
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6128 // A thread to watch the '/dev/mem_notify' device, which will tell us when the OS is running low on memory. |
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6129 // |
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6130 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
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6131 |
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|
6132 // ctor |
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6133 // |
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6134 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
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6135 assert(memnotify_thread() == NULL, "we can only allocate one MemNotifyThread"); |
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6136 _fd = fd; |
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6137 |
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6138 if (os::create_thread(this, os::os_thread)) { |
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6139 _memnotify_thread = this; |
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6140 os::set_priority(this, NearMaxPriority); |
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6141 os::start_thread(this); |
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|
6142 } |
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|
6143 } |
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|
6144 |
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6145 // Where all the work gets done |
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6146 // |
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6147 void MemNotifyThread::run() { |
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6148 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
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6149 |
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6150 // Set up the select arguments |
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6151 fd_set rfds; |
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|
6152 if (_fd != -1) { |
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|
6153 FD_ZERO(&rfds); |
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|
6154 FD_SET(_fd, &rfds); |
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|
6155 } |
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|
6156 |
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6157 // Now wait for the mem_notify device to wake up |
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|
6158 while (1) { |
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6159 // Wait for the mem_notify device to signal us.. |
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6160 int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL); |
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|
6161 if (rc == -1) { |
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|
6162 perror("select!\n"); |
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|
6163 break; |
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|
6164 } else if (rc) { |
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6165 //ssize_t free_before = os::available_memory(); |
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6166 //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024); |
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6167 |
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6168 // The kernel is telling us there is not much memory left... |
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|
6169 // try to do something about that |
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|
6170 |
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6171 // If we are not already in a GC, try one. |
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6172 if (!Universe::heap()->is_gc_active()) { |
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6173 Universe::heap()->collect(GCCause::_allocation_failure); |
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6174 |
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6175 //ssize_t free_after = os::available_memory(); |
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6176 //tty->print ("Post-Notify: Free: %dK\n",free_after/1024); |
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6177 //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024); |
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6178 } |
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6179 // We might want to do something like the following if we find the GC's are not helping... |
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6180 // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true); |
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6181 } |
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|
6182 } |
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|
6183 } |
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|
6184 |
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|
6185 // |
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6186 // See if the /dev/mem_notify device exists, and if so, start a thread to monitor it. |
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|
6187 // |
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6188 void MemNotifyThread::start() { |
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|
6189 int fd; |
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|
6190 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
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|
6191 if (fd < 0) { |
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|
6192 return; |
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|
6193 } |
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|
6194 |
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|
6195 if (memnotify_thread() == NULL) { |
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|
6196 new MemNotifyThread(fd); |
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|
6197 } |
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|
6198 } |
10405 | 6199 |
3802
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6200 #endif // JAVASE_EMBEDDED |
12110
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|
6201 |
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6202 |
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|
6203 /////////////// Unit tests /////////////// |
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|
6204 |
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|
6205 #ifndef PRODUCT |
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|
6206 |
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|
6207 #define test_log(...) \ |
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|
6208 do {\ |
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|
6209 if (VerboseInternalVMTests) { \ |
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|
6210 tty->print_cr(__VA_ARGS__); \ |
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|
6211 tty->flush(); \ |
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|
6212 }\ |
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|
6213 } while (false) |
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|
6214 |
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|
6215 class TestReserveMemorySpecial : AllStatic { |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
6216 public: |
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|
6217 static void small_page_write(void* addr, size_t size) { |
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|
6218 size_t page_size = os::vm_page_size(); |
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|
6219 |
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|
6220 char* end = (char*)addr + size; |
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|
6221 for (char* p = (char*)addr; p < end; p += page_size) { |
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|
6222 *p = 1; |
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|
6223 } |
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|
6224 } |
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|
6225 |
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|
6226 static void test_reserve_memory_special_huge_tlbfs_only(size_t size) { |
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6227 if (!UseHugeTLBFS) { |
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|
6228 return; |
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|
6229 } |
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|
6230 |
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|
6231 test_log("test_reserve_memory_special_huge_tlbfs_only(" SIZE_FORMAT ")", size); |
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6232 |
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|
6233 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_only(size, NULL, false); |
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|
6234 |
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|
6235 if (addr != NULL) { |
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|
6236 small_page_write(addr, size); |
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|
6237 |
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|
6238 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
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|
6239 } |
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|
6240 } |
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|
6241 |
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|
6242 static void test_reserve_memory_special_huge_tlbfs_only() { |
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|
6243 if (!UseHugeTLBFS) { |
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|
6244 return; |
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|
6245 } |
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|
6246 |
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|
6247 size_t lp = os::large_page_size(); |
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6248 |
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6249 for (size_t size = lp; size <= lp * 10; size += lp) { |
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|
6250 test_reserve_memory_special_huge_tlbfs_only(size); |
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|
6251 } |
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|
6252 } |
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|
6253 |
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|
6254 static void test_reserve_memory_special_huge_tlbfs_mixed(size_t size, size_t alignment) { |
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6255 if (!UseHugeTLBFS) { |
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6256 return; |
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|
6257 } |
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changeset
|
6258 |
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changeset
|
6259 test_log("test_reserve_memory_special_huge_tlbfs_mixed(" SIZE_FORMAT ", " SIZE_FORMAT ")", |
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|
6260 size, alignment); |
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diff
changeset
|
6261 |
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changeset
|
6262 assert(size >= os::large_page_size(), "Incorrect input to test"); |
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changeset
|
6263 |
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changeset
|
6264 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, NULL, false); |
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changeset
|
6265 |
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changeset
|
6266 if (addr != NULL) { |
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changeset
|
6267 small_page_write(addr, size); |
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diff
changeset
|
6268 |
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changeset
|
6269 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
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changeset
|
6270 } |
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diff
changeset
|
6271 } |
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diff
changeset
|
6272 |
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changeset
|
6273 static void test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(size_t size) { |
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|
6274 size_t lp = os::large_page_size(); |
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|
6275 size_t ag = os::vm_allocation_granularity(); |
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changeset
|
6276 |
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changeset
|
6277 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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|
6278 test_reserve_memory_special_huge_tlbfs_mixed(size, alignment); |
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|
6279 } |
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diff
changeset
|
6280 } |
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diff
changeset
|
6281 |
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changeset
|
6282 static void test_reserve_memory_special_huge_tlbfs_mixed() { |
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|
6283 size_t lp = os::large_page_size(); |
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changeset
|
6284 size_t ag = os::vm_allocation_granularity(); |
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diff
changeset
|
6285 |
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changeset
|
6286 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp); |
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|
6287 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + ag); |
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|
6288 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + lp / 2); |
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|
6289 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2); |
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|
6290 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + ag); |
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|
6291 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 - ag); |
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|
6292 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + lp / 2); |
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|
6293 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10); |
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changeset
|
6294 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10 + lp / 2); |
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changeset
|
6295 } |
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diff
changeset
|
6296 |
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diff
changeset
|
6297 static void test_reserve_memory_special_huge_tlbfs() { |
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|
6298 if (!UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6299 return; |
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diff
changeset
|
6300 } |
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diff
changeset
|
6301 |
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changeset
|
6302 test_reserve_memory_special_huge_tlbfs_only(); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6303 test_reserve_memory_special_huge_tlbfs_mixed(); |
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diff
changeset
|
6304 } |
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diff
changeset
|
6305 |
4c84d351cca9
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diff
changeset
|
6306 static void test_reserve_memory_special_shm(size_t size, size_t alignment) { |
4c84d351cca9
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diff
changeset
|
6307 if (!UseSHM) { |
4c84d351cca9
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parents:
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diff
changeset
|
6308 return; |
4c84d351cca9
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diff
changeset
|
6309 } |
4c84d351cca9
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diff
changeset
|
6310 |
4c84d351cca9
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diff
changeset
|
6311 test_log("test_reserve_memory_special_shm(" SIZE_FORMAT ", " SIZE_FORMAT ")", size, alignment); |
4c84d351cca9
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changeset
|
6312 |
4c84d351cca9
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diff
changeset
|
6313 char* addr = os::Linux::reserve_memory_special_shm(size, alignment, NULL, false); |
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diff
changeset
|
6314 |
4c84d351cca9
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diff
changeset
|
6315 if (addr != NULL) { |
4c84d351cca9
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changeset
|
6316 assert(is_ptr_aligned(addr, alignment), "Check"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6317 assert(is_ptr_aligned(addr, os::large_page_size()), "Check"); |
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diff
changeset
|
6318 |
4c84d351cca9
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diff
changeset
|
6319 small_page_write(addr, size); |
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diff
changeset
|
6320 |
4c84d351cca9
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diff
changeset
|
6321 os::Linux::release_memory_special_shm(addr, size); |
4c84d351cca9
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changeset
|
6322 } |
4c84d351cca9
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diff
changeset
|
6323 } |
4c84d351cca9
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diff
changeset
|
6324 |
4c84d351cca9
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changeset
|
6325 static void test_reserve_memory_special_shm() { |
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changeset
|
6326 size_t lp = os::large_page_size(); |
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changeset
|
6327 size_t ag = os::vm_allocation_granularity(); |
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diff
changeset
|
6328 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6329 for (size_t size = ag; size < lp * 3; size += ag) { |
4c84d351cca9
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changeset
|
6330 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
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changeset
|
6331 test_reserve_memory_special_shm(size, alignment); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6332 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6333 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6334 } |
4c84d351cca9
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parents:
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diff
changeset
|
6335 |
4c84d351cca9
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diff
changeset
|
6336 static void test() { |
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changeset
|
6337 test_reserve_memory_special_huge_tlbfs(); |
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changeset
|
6338 test_reserve_memory_special_shm(); |
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changeset
|
6339 } |
4c84d351cca9
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changeset
|
6340 }; |
4c84d351cca9
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changeset
|
6341 |
4c84d351cca9
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changeset
|
6342 void TestReserveMemorySpecial_test() { |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6343 TestReserveMemorySpecial::test(); |
4c84d351cca9
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changeset
|
6344 } |
4c84d351cca9
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changeset
|
6345 |
4c84d351cca9
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changeset
|
6346 #endif |