Mercurial > hg > graal-compiler
annotate src/os/linux/vm/os_linux.cpp @ 17077:0a210ccd3bd3
HSAIL: test case for HSAIL deopt bug
Contributed-by: Eric Caspole <eric.caspole@amd.com>
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 09 Sep 2014 14:05:28 +0200 |
parents | b1911c1e44c8 |
children | 3eed8712d410 |
rev | line source |
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0 | 1 /* |
14909 | 2 * Copyright (c) 1999, 2013, 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" | |
52 #include "runtime/osThread.hpp" | |
53 #include "runtime/perfMemory.hpp" | |
54 #include "runtime/sharedRuntime.hpp" | |
55 #include "runtime/statSampler.hpp" | |
56 #include "runtime/stubRoutines.hpp" | |
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57 #include "runtime/thread.inline.hpp" |
1972 | 58 #include "runtime/threadCritical.hpp" |
59 #include "runtime/timer.hpp" | |
60 #include "services/attachListener.hpp" | |
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61 #include "services/memTracker.hpp" |
1972 | 62 #include "services/runtimeService.hpp" |
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63 #include "utilities/decoder.hpp" |
1972 | 64 #include "utilities/defaultStream.hpp" |
65 #include "utilities/events.hpp" | |
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66 #include "utilities/elfFile.hpp" |
1972 | 67 #include "utilities/growableArray.hpp" |
68 #include "utilities/vmError.hpp" | |
0 | 69 |
70 // put OS-includes here | |
71 # include <sys/types.h> | |
72 # include <sys/mman.h> | |
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73 # include <sys/stat.h> |
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74 # include <sys/select.h> |
0 | 75 # include <pthread.h> |
76 # include <signal.h> | |
77 # include <errno.h> | |
78 # include <dlfcn.h> | |
79 # include <stdio.h> | |
80 # include <unistd.h> | |
81 # include <sys/resource.h> | |
82 # include <pthread.h> | |
83 # include <sys/stat.h> | |
84 # include <sys/time.h> | |
85 # include <sys/times.h> | |
86 # include <sys/utsname.h> | |
87 # include <sys/socket.h> | |
88 # include <sys/wait.h> | |
89 # include <pwd.h> | |
90 # include <poll.h> | |
91 # include <semaphore.h> | |
92 # include <fcntl.h> | |
93 # include <string.h> | |
94 # include <syscall.h> | |
95 # include <sys/sysinfo.h> | |
96 # include <gnu/libc-version.h> | |
97 # include <sys/ipc.h> | |
98 # include <sys/shm.h> | |
99 # include <link.h> | |
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100 # include <stdint.h> |
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101 # include <inttypes.h> |
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102 # include <sys/ioctl.h> |
0 | 103 |
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104 // if RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling |
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105 // getrusage() is prepared to handle the associated failure. |
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106 #ifndef RUSAGE_THREAD |
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107 #define RUSAGE_THREAD (1) /* only the calling thread */ |
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108 #endif |
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109 |
0 | 110 #define MAX_PATH (2 * K) |
111 | |
112 // for timer info max values which include all bits | |
113 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
114 | |
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115 #define LARGEPAGES_BIT (1 << 6) |
0 | 116 //////////////////////////////////////////////////////////////////////////////// |
117 // global variables | |
118 julong os::Linux::_physical_memory = 0; | |
119 | |
120 address os::Linux::_initial_thread_stack_bottom = NULL; | |
121 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
122 | |
123 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
124 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
125 Mutex* os::Linux::_createThread_lock = NULL; | |
126 pthread_t os::Linux::_main_thread; | |
127 int os::Linux::_page_size = -1; | |
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128 const int os::Linux::_vm_default_page_size = (8 * K); |
0 | 129 bool os::Linux::_is_floating_stack = false; |
130 bool os::Linux::_is_NPTL = false; | |
131 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
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132 const char * os::Linux::_glibc_version = NULL; |
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133 const char * os::Linux::_libpthread_version = NULL; |
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134 pthread_condattr_t os::Linux::_condattr[1]; |
0 | 135 |
136 static jlong initial_time_count=0; | |
137 | |
138 static int clock_tics_per_sec = 100; | |
139 | |
140 // For diagnostics to print a message once. see run_periodic_checks | |
141 static sigset_t check_signal_done; | |
14909 | 142 static bool check_signals = true;; |
0 | 143 |
144 static pid_t _initial_pid = 0; | |
145 | |
146 /* Signal number used to suspend/resume a thread */ | |
147 | |
148 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
149 static int SR_signum = SIGUSR2; | |
150 sigset_t SR_sigset; | |
151 | |
242 | 152 /* Used to protect dlsym() calls */ |
153 static pthread_mutex_t dl_mutex; | |
154 | |
10405 | 155 // Declarations |
156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
157 | |
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158 #ifdef JAVASE_EMBEDDED |
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159 class MemNotifyThread: public Thread { |
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160 friend class VMStructs; |
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161 public: |
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162 virtual void run(); |
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163 |
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164 private: |
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165 static MemNotifyThread* _memnotify_thread; |
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166 int _fd; |
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167 |
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168 public: |
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169 |
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170 // Constructor |
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171 MemNotifyThread(int fd); |
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172 |
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173 // Tester |
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174 bool is_memnotify_thread() const { return true; } |
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175 |
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176 // Printing |
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177 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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178 |
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179 // Returns the single instance of the MemNotifyThread |
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180 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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181 |
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182 // Create and start the single instance of MemNotifyThread |
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183 static void start(); |
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184 }; |
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185 #endif // JAVASE_EMBEDDED |
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186 |
0 | 187 // utility functions |
188 | |
189 static int SR_initialize(); | |
190 | |
191 julong os::available_memory() { | |
192 return Linux::available_memory(); | |
193 } | |
194 | |
195 julong os::Linux::available_memory() { | |
196 // values in struct sysinfo are "unsigned long" | |
197 struct sysinfo si; | |
198 sysinfo(&si); | |
199 | |
200 return (julong)si.freeram * si.mem_unit; | |
201 } | |
202 | |
203 julong os::physical_memory() { | |
204 return Linux::physical_memory(); | |
205 } | |
206 | |
207 //////////////////////////////////////////////////////////////////////////////// | |
208 // environment support | |
209 | |
210 bool os::getenv(const char* name, char* buf, int len) { | |
211 const char* val = ::getenv(name); | |
212 if (val != NULL && strlen(val) < (size_t)len) { | |
213 strcpy(buf, val); | |
214 return true; | |
215 } | |
216 if (len > 0) buf[0] = 0; // return a null string | |
217 return false; | |
218 } | |
219 | |
220 | |
221 // Return true if user is running as root. | |
222 | |
223 bool os::have_special_privileges() { | |
224 static bool init = false; | |
225 static bool privileges = false; | |
226 if (!init) { | |
227 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
228 init = true; | |
229 } | |
230 return privileges; | |
231 } | |
232 | |
233 | |
234 #ifndef SYS_gettid | |
235 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
236 #ifdef __ia64__ | |
237 #define SYS_gettid 1105 | |
238 #elif __i386__ | |
239 #define SYS_gettid 224 | |
240 #elif __amd64__ | |
241 #define SYS_gettid 186 | |
242 #elif __sparc__ | |
243 #define SYS_gettid 143 | |
244 #else | |
245 #error define gettid for the arch | |
246 #endif | |
247 #endif | |
248 | |
249 // Cpu architecture string | |
1010 | 250 #if defined(ZERO) |
251 static char cpu_arch[] = ZERO_LIBARCH; | |
252 #elif defined(IA64) | |
0 | 253 static char cpu_arch[] = "ia64"; |
254 #elif defined(IA32) | |
255 static char cpu_arch[] = "i386"; | |
256 #elif defined(AMD64) | |
257 static char cpu_arch[] = "amd64"; | |
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258 #elif defined(ARM) |
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259 static char cpu_arch[] = "arm"; |
14909 | 260 #elif defined(PPC) |
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261 static char cpu_arch[] = "ppc"; |
0 | 262 #elif defined(SPARC) |
263 # ifdef _LP64 | |
264 static char cpu_arch[] = "sparcv9"; | |
265 # else | |
266 static char cpu_arch[] = "sparc"; | |
267 # endif | |
268 #else | |
269 #error Add appropriate cpu_arch setting | |
270 #endif | |
271 | |
272 | |
273 // pid_t gettid() | |
274 // | |
275 // Returns the kernel thread id of the currently running thread. Kernel | |
276 // thread id is used to access /proc. | |
277 // | |
278 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
279 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
280 // | |
281 pid_t os::Linux::gettid() { | |
282 int rslt = syscall(SYS_gettid); | |
283 if (rslt == -1) { | |
284 // old kernel, no NPTL support | |
285 return getpid(); | |
286 } else { | |
287 return (pid_t)rslt; | |
288 } | |
289 } | |
290 | |
291 // Most versions of linux have a bug where the number of processors are | |
292 // determined by looking at the /proc file system. In a chroot environment, | |
293 // the system call returns 1. This causes the VM to act as if it is | |
294 // a single processor and elide locking (see is_MP() call). | |
295 static bool unsafe_chroot_detected = false; | |
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296 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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297 "Java may be unstable running multithreaded in a chroot " |
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298 "environment on Linux when /proc filesystem is not mounted."; |
0 | 299 |
300 void os::Linux::initialize_system_info() { | |
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301 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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302 if (processor_count() == 1) { |
0 | 303 pid_t pid = os::Linux::gettid(); |
304 char fname[32]; | |
305 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
306 FILE *fp = fopen(fname, "r"); | |
307 if (fp == NULL) { | |
308 unsafe_chroot_detected = true; | |
309 } else { | |
310 fclose(fp); | |
311 } | |
312 } | |
313 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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314 assert(processor_count() > 0, "linux error"); |
0 | 315 } |
316 | |
317 void os::init_system_properties_values() { | |
318 // char arch[12]; | |
319 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
320 | |
321 // The next steps are taken in the product version: | |
322 // | |
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323 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 324 // This library should be located at: |
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325 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 326 // |
327 // If "/jre/lib/" appears at the right place in the path, then we | |
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328 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 329 // |
330 // Otherwise exit with message: "Could not create the Java virtual machine." | |
331 // | |
332 // The following extra steps are taken in the debugging version: | |
333 // | |
334 // If "/jre/lib/" does NOT appear at the right place in the path | |
335 // instead of exit check for $JAVA_HOME environment variable. | |
336 // | |
337 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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338 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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339 // it looks like libjvm.so is installed there |
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340 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 341 // |
342 // Otherwise exit. | |
343 // | |
344 // Important note: if the location of libjvm.so changes this | |
345 // code needs to be changed accordingly. | |
346 | |
347 // The next few definitions allow the code to be verbatim: | |
6197 | 348 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
0 | 349 #define getenv(n) ::getenv(n) |
350 | |
351 /* | |
352 * See ld(1): | |
353 * The linker uses the following search paths to locate required | |
354 * shared libraries: | |
355 * 1: ... | |
356 * ... | |
357 * 7: The default directories, normally /lib and /usr/lib. | |
358 */ | |
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359 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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360 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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361 #else |
0 | 362 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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363 #endif |
0 | 364 |
365 #define EXTENSIONS_DIR "/lib/ext" | |
366 #define ENDORSED_DIR "/lib/endorsed" | |
367 #define REG_DIR "/usr/java/packages" | |
368 | |
369 { | |
370 /* sysclasspath, java_home, dll_dir */ | |
371 { | |
372 char *home_path; | |
373 char *dll_path; | |
374 char *pslash; | |
375 char buf[MAXPATHLEN]; | |
376 os::jvm_path(buf, sizeof(buf)); | |
377 | |
378 // Found the full path to libjvm.so. | |
379 // Now cut the path to <java_home>/jre if we can. | |
380 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
381 pslash = strrchr(buf, '/'); | |
382 if (pslash != NULL) | |
383 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
384 dll_path = malloc(strlen(buf) + 1); | |
385 if (dll_path == NULL) | |
386 return; | |
387 strcpy(dll_path, buf); | |
388 Arguments::set_dll_dir(dll_path); | |
389 | |
390 if (pslash != NULL) { | |
391 pslash = strrchr(buf, '/'); | |
392 if (pslash != NULL) { | |
393 *pslash = '\0'; /* get rid of /<arch> */ | |
394 pslash = strrchr(buf, '/'); | |
395 if (pslash != NULL) | |
396 *pslash = '\0'; /* get rid of /lib */ | |
397 } | |
398 } | |
399 | |
400 home_path = malloc(strlen(buf) + 1); | |
401 if (home_path == NULL) | |
402 return; | |
403 strcpy(home_path, buf); | |
404 Arguments::set_java_home(home_path); | |
405 | |
406 if (!set_boot_path('/', ':')) | |
407 return; | |
408 } | |
409 | |
410 /* | |
411 * Where to look for native libraries | |
412 * | |
413 * Note: Due to a legacy implementation, most of the library path | |
414 * is set in the launcher. This was to accomodate linking restrictions | |
415 * on legacy Linux implementations (which are no longer supported). | |
416 * Eventually, all the library path setting will be done here. | |
417 * | |
418 * However, to prevent the proliferation of improperly built native | |
419 * libraries, the new path component /usr/java/packages is added here. | |
420 * Eventually, all the library path setting will be done here. | |
421 */ | |
422 { | |
423 char *ld_library_path; | |
424 | |
425 /* | |
426 * Construct the invariant part of ld_library_path. Note that the | |
427 * space for the colon and the trailing null are provided by the | |
428 * nulls included by the sizeof operator (so actually we allocate | |
429 * a byte more than necessary). | |
430 */ | |
431 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + | |
432 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
433 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
434 | |
435 /* | |
436 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
437 * should always exist (until the legacy problem cited above is | |
438 * addressed). | |
439 */ | |
440 char *v = getenv("LD_LIBRARY_PATH"); | |
441 if (v != NULL) { | |
442 char *t = ld_library_path; | |
443 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
444 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
445 sprintf(ld_library_path, "%s:%s", v, t); | |
446 } | |
447 Arguments::set_library_path(ld_library_path); | |
448 } | |
449 | |
450 /* | |
451 * Extensions directories. | |
452 * | |
453 * Note that the space for the colon and the trailing null are provided | |
454 * by the nulls included by the sizeof operator (so actually one byte more | |
455 * than necessary is allocated). | |
456 */ | |
457 { | |
458 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
459 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
460 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
461 Arguments::get_java_home()); | |
462 Arguments::set_ext_dirs(buf); | |
463 } | |
464 | |
465 /* Endorsed standards default directory. */ | |
466 { | |
467 char * buf; | |
468 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
469 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
470 Arguments::set_endorsed_dirs(buf); | |
471 } | |
472 } | |
473 | |
474 #undef malloc | |
475 #undef getenv | |
476 #undef EXTENSIONS_DIR | |
477 #undef ENDORSED_DIR | |
478 | |
479 // Done | |
480 return; | |
481 } | |
482 | |
483 //////////////////////////////////////////////////////////////////////////////// | |
484 // breakpoint support | |
485 | |
486 void os::breakpoint() { | |
487 BREAKPOINT; | |
488 } | |
489 | |
490 extern "C" void breakpoint() { | |
491 // use debugger to set breakpoint here | |
492 } | |
493 | |
494 //////////////////////////////////////////////////////////////////////////////// | |
495 // signal support | |
496 | |
497 debug_only(static bool signal_sets_initialized = false); | |
498 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
499 | |
500 bool os::Linux::is_sig_ignored(int sig) { | |
501 struct sigaction oact; | |
502 sigaction(sig, (struct sigaction*)NULL, &oact); | |
503 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
504 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
505 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
506 return true; | |
507 else | |
508 return false; | |
509 } | |
510 | |
511 void os::Linux::signal_sets_init() { | |
512 // Should also have an assertion stating we are still single-threaded. | |
513 assert(!signal_sets_initialized, "Already initialized"); | |
514 // Fill in signals that are necessarily unblocked for all threads in | |
515 // the VM. Currently, we unblock the following signals: | |
516 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
517 // by -Xrs (=ReduceSignalUsage)); | |
518 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
519 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
520 // the dispositions or masks wrt these signals. | |
521 // Programs embedding the VM that want to use the above signals for their | |
522 // own purposes must, at this time, use the "-Xrs" option to prevent | |
523 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
524 // (See bug 4345157, and other related bugs). | |
525 // In reality, though, unblocking these signals is really a nop, since | |
526 // these signals are not blocked by default. | |
527 sigemptyset(&unblocked_sigs); | |
528 sigemptyset(&allowdebug_blocked_sigs); | |
529 sigaddset(&unblocked_sigs, SIGILL); | |
530 sigaddset(&unblocked_sigs, SIGSEGV); | |
531 sigaddset(&unblocked_sigs, SIGBUS); | |
532 sigaddset(&unblocked_sigs, SIGFPE); | |
533 sigaddset(&unblocked_sigs, SR_signum); | |
534 | |
535 if (!ReduceSignalUsage) { | |
536 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
537 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
538 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
539 } | |
540 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
541 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
542 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
543 } | |
544 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
545 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
546 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
547 } | |
548 } | |
549 // Fill in signals that are blocked by all but the VM thread. | |
550 sigemptyset(&vm_sigs); | |
551 if (!ReduceSignalUsage) | |
552 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
553 debug_only(signal_sets_initialized = true); | |
554 | |
555 } | |
556 | |
557 // These are signals that are unblocked while a thread is running Java. | |
558 // (For some reason, they get blocked by default.) | |
559 sigset_t* os::Linux::unblocked_signals() { | |
560 assert(signal_sets_initialized, "Not initialized"); | |
561 return &unblocked_sigs; | |
562 } | |
563 | |
564 // These are the signals that are blocked while a (non-VM) thread is | |
565 // running Java. Only the VM thread handles these signals. | |
566 sigset_t* os::Linux::vm_signals() { | |
567 assert(signal_sets_initialized, "Not initialized"); | |
568 return &vm_sigs; | |
569 } | |
570 | |
571 // These are signals that are blocked during cond_wait to allow debugger in | |
572 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
573 assert(signal_sets_initialized, "Not initialized"); | |
574 return &allowdebug_blocked_sigs; | |
575 } | |
576 | |
577 void os::Linux::hotspot_sigmask(Thread* thread) { | |
578 | |
579 //Save caller's signal mask before setting VM signal mask | |
580 sigset_t caller_sigmask; | |
581 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
582 | |
583 OSThread* osthread = thread->osthread(); | |
584 osthread->set_caller_sigmask(caller_sigmask); | |
585 | |
586 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
587 | |
588 if (!ReduceSignalUsage) { | |
589 if (thread->is_VM_thread()) { | |
590 // Only the VM thread handles BREAK_SIGNAL ... | |
591 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
592 } else { | |
593 // ... all other threads block BREAK_SIGNAL | |
594 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
595 } | |
596 } | |
597 } | |
598 | |
599 ////////////////////////////////////////////////////////////////////////////// | |
600 // detecting pthread library | |
601 | |
602 void os::Linux::libpthread_init() { | |
603 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
604 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
605 // generic name for earlier versions. | |
606 // Define macros here so we can build HotSpot on old systems. | |
607 # ifndef _CS_GNU_LIBC_VERSION | |
608 # define _CS_GNU_LIBC_VERSION 2 | |
609 # endif | |
610 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
611 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
612 # endif | |
613 | |
614 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
615 if (n > 0) { | |
6197 | 616 char *str = (char *)malloc(n, mtInternal); |
0 | 617 confstr(_CS_GNU_LIBC_VERSION, str, n); |
618 os::Linux::set_glibc_version(str); | |
619 } else { | |
620 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
621 static char _gnu_libc_version[32]; | |
622 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
623 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
624 os::Linux::set_glibc_version(_gnu_libc_version); | |
625 } | |
626 | |
627 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
628 if (n > 0) { | |
6197 | 629 char *str = (char *)malloc(n, mtInternal); |
0 | 630 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
631 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
632 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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633 // is the case. LinuxThreads has a hard limit on max number of threads. |
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634 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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635 // On the other hand, NPTL does not have such a limit, sysconf() |
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636 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 637 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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638 strstr(str, "NPTL") && |
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639 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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640 free(str); |
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641 os::Linux::set_libpthread_version("linuxthreads"); |
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642 } else { |
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643 os::Linux::set_libpthread_version(str); |
0 | 644 } |
645 } else { | |
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646 // glibc before 2.3.2 only has LinuxThreads. |
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647 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 648 } |
649 | |
650 if (strstr(libpthread_version(), "NPTL")) { | |
651 os::Linux::set_is_NPTL(); | |
652 } else { | |
653 os::Linux::set_is_LinuxThreads(); | |
654 } | |
655 | |
656 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
657 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
658 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
659 os::Linux::set_is_floating_stack(); | |
660 } | |
661 } | |
662 | |
663 ///////////////////////////////////////////////////////////////////////////// | |
664 // thread stack | |
665 | |
666 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
667 // to the stack guard, caller should block all signals. | |
668 // | |
669 // MAP_GROWSDOWN: | |
670 // A special mmap() flag that is used to implement thread stacks. It tells | |
671 // kernel that the memory region should extend downwards when needed. This | |
672 // allows early versions of LinuxThreads to only mmap the first few pages | |
673 // when creating a new thread. Linux kernel will automatically expand thread | |
674 // stack as needed (on page faults). | |
675 // | |
676 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
677 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
678 // region, it's hard to tell if the fault is due to a legitimate stack | |
679 // access or because of reading/writing non-exist memory (e.g. buffer | |
680 // overrun). As a rule, if the fault happens below current stack pointer, | |
681 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
682 // application (see Linux kernel fault.c). | |
683 // | |
684 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
685 // stack overflow detection. | |
686 // | |
687 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
688 // not use this flag. However, the stack of initial thread is not created | |
689 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
690 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
691 // and then attach the thread to JVM. | |
692 // | |
693 // To get around the problem and allow stack banging on Linux, we need to | |
694 // manually expand thread stack after receiving the SIGSEGV. | |
695 // | |
696 // There are two ways to expand thread stack to address "bottom", we used | |
697 // both of them in JVM before 1.5: | |
698 // 1. adjust stack pointer first so that it is below "bottom", and then | |
699 // touch "bottom" | |
700 // 2. mmap() the page in question | |
701 // | |
702 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
703 // if current sp is already near the lower end of page 101, and we need to | |
704 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
705 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
706 // That will destroy the mmap() frame and cause VM to crash. | |
707 // | |
708 // The following code works by adjusting sp first, then accessing the "bottom" | |
709 // page to force a page fault. Linux kernel will then automatically expand the | |
710 // stack mapping. | |
711 // | |
712 // _expand_stack_to() assumes its frame size is less than page size, which | |
713 // should always be true if the function is not inlined. | |
714 | |
715 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
716 #define NOINLINE | |
717 #else | |
718 #define NOINLINE __attribute__ ((noinline)) | |
719 #endif | |
720 | |
721 static void _expand_stack_to(address bottom) NOINLINE; | |
722 | |
723 static void _expand_stack_to(address bottom) { | |
724 address sp; | |
725 size_t size; | |
726 volatile char *p; | |
727 | |
728 // Adjust bottom to point to the largest address within the same page, it | |
729 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
730 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
731 bottom += os::Linux::page_size() - 1; | |
732 | |
733 // sp might be slightly above current stack pointer; if that's the case, we | |
734 // will alloca() a little more space than necessary, which is OK. Don't use | |
735 // os::current_stack_pointer(), as its result can be slightly below current | |
736 // stack pointer, causing us to not alloca enough to reach "bottom". | |
737 sp = (address)&sp; | |
738 | |
739 if (sp > bottom) { | |
740 size = sp - bottom; | |
741 p = (volatile char *)alloca(size); | |
742 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
743 p[0] = '\0'; | |
744 } | |
745 } | |
746 | |
747 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
748 assert(t!=NULL, "just checking"); | |
749 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
750 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
751 | |
752 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
753 sigset_t mask_all, old_sigset; | |
754 sigfillset(&mask_all); | |
755 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
756 _expand_stack_to(addr); | |
757 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
758 return true; | |
759 } | |
760 return false; | |
761 } | |
762 | |
763 ////////////////////////////////////////////////////////////////////////////// | |
764 // create new thread | |
765 | |
766 static address highest_vm_reserved_address(); | |
767 | |
768 // check if it's safe to start a new thread | |
769 static bool _thread_safety_check(Thread* thread) { | |
770 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
771 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
772 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
773 // allocated (MAP_FIXED) from high address space. Every thread stack | |
774 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
775 // it to other values if they rebuild LinuxThreads). | |
776 // | |
777 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
778 // the memory region has already been mmap'ed. That means if we have too | |
779 // many threads and/or very large heap, eventually thread stack will | |
780 // collide with heap. | |
781 // | |
782 // Here we try to prevent heap/stack collision by comparing current | |
783 // stack bottom with the highest address that has been mmap'ed by JVM | |
784 // plus a safety margin for memory maps created by native code. | |
785 // | |
786 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
787 // | |
788 if (ThreadSafetyMargin > 0) { | |
789 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
790 | |
791 // not safe if our stack extends below the safety margin | |
792 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
793 } else { | |
794 return true; | |
795 } | |
796 } else { | |
797 // Floating stack LinuxThreads or NPTL: | |
798 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
799 // there's not enough space left, pthread_create() will fail. If we come | |
800 // here, that means enough space has been reserved for stack. | |
801 return true; | |
802 } | |
803 } | |
804 | |
805 // Thread start routine for all newly created threads | |
806 static void *java_start(Thread *thread) { | |
807 // Try to randomize the cache line index of hot stack frames. | |
808 // This helps when threads of the same stack traces evict each other's | |
809 // cache lines. The threads can be either from the same JVM instance, or | |
810 // from different JVM instances. The benefit is especially true for | |
811 // processors with hyperthreading technology. | |
812 static int counter = 0; | |
813 int pid = os::current_process_id(); | |
814 alloca(((pid ^ counter++) & 7) * 128); | |
815 | |
816 ThreadLocalStorage::set_thread(thread); | |
817 | |
818 OSThread* osthread = thread->osthread(); | |
819 Monitor* sync = osthread->startThread_lock(); | |
820 | |
821 // non floating stack LinuxThreads needs extra check, see above | |
822 if (!_thread_safety_check(thread)) { | |
823 // notify parent thread | |
824 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
825 osthread->set_state(ZOMBIE); | |
826 sync->notify_all(); | |
827 return NULL; | |
828 } | |
829 | |
830 // thread_id is kernel thread id (similar to Solaris LWP id) | |
831 osthread->set_thread_id(os::Linux::gettid()); | |
832 | |
833 if (UseNUMA) { | |
834 int lgrp_id = os::numa_get_group_id(); | |
835 if (lgrp_id != -1) { | |
836 thread->set_lgrp_id(lgrp_id); | |
837 } | |
838 } | |
839 // initialize signal mask for this thread | |
840 os::Linux::hotspot_sigmask(thread); | |
841 | |
842 // initialize floating point control register | |
843 os::Linux::init_thread_fpu_state(); | |
844 | |
845 // handshaking with parent thread | |
846 { | |
847 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
848 | |
849 // notify parent thread | |
850 osthread->set_state(INITIALIZED); | |
851 sync->notify_all(); | |
852 | |
853 // wait until os::start_thread() | |
854 while (osthread->get_state() == INITIALIZED) { | |
855 sync->wait(Mutex::_no_safepoint_check_flag); | |
856 } | |
857 } | |
858 | |
859 // call one more level start routine | |
860 thread->run(); | |
861 | |
862 return 0; | |
863 } | |
864 | |
865 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
866 assert(thread->osthread() == NULL, "caller responsible"); | |
867 | |
868 // Allocate the OSThread object | |
869 OSThread* osthread = new OSThread(NULL, NULL); | |
870 if (osthread == NULL) { | |
871 return false; | |
872 } | |
873 | |
874 // set the correct thread state | |
875 osthread->set_thread_type(thr_type); | |
876 | |
877 // Initial state is ALLOCATED but not INITIALIZED | |
878 osthread->set_state(ALLOCATED); | |
879 | |
880 thread->set_osthread(osthread); | |
881 | |
882 // init thread attributes | |
883 pthread_attr_t attr; | |
884 pthread_attr_init(&attr); | |
885 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
886 | |
887 // stack size | |
888 if (os::Linux::supports_variable_stack_size()) { | |
889 // calculate stack size if it's not specified by caller | |
890 if (stack_size == 0) { | |
891 stack_size = os::Linux::default_stack_size(thr_type); | |
892 | |
893 switch (thr_type) { | |
894 case os::java_thread: | |
1867
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895 // Java threads use ThreadStackSize which default value can be |
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896 // changed with the flag -Xss |
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897 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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898 stack_size = JavaThread::stack_size_at_create(); |
0 | 899 break; |
900 case os::compiler_thread: | |
901 if (CompilerThreadStackSize > 0) { | |
902 stack_size = (size_t)(CompilerThreadStackSize * K); | |
903 break; | |
904 } // else fall through: | |
905 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
906 case os::vm_thread: | |
907 case os::pgc_thread: | |
908 case os::cgc_thread: | |
909 case os::watcher_thread: | |
910 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
911 break; | |
912 } | |
913 } | |
914 | |
915 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
916 pthread_attr_setstacksize(&attr, stack_size); | |
917 } else { | |
918 // let pthread_create() pick the default value. | |
919 } | |
920 | |
921 // glibc guard page | |
922 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
923 | |
924 ThreadState state; | |
925 | |
926 { | |
927 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
928 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
929 if (lock) { | |
930 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
931 } | |
932 | |
933 pthread_t tid; | |
934 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
935 | |
936 pthread_attr_destroy(&attr); | |
937 | |
938 if (ret != 0) { | |
939 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
940 perror("pthread_create()"); | |
941 } | |
942 // Need to clean up stuff we've allocated so far | |
943 thread->set_osthread(NULL); | |
944 delete osthread; | |
945 if (lock) os::Linux::createThread_lock()->unlock(); | |
946 return false; | |
947 } | |
948 | |
949 // Store pthread info into the OSThread | |
950 osthread->set_pthread_id(tid); | |
951 | |
952 // Wait until child thread is either initialized or aborted | |
953 { | |
954 Monitor* sync_with_child = osthread->startThread_lock(); | |
955 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
956 while ((state = osthread->get_state()) == ALLOCATED) { | |
957 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
958 } | |
959 } | |
960 | |
961 if (lock) { | |
962 os::Linux::createThread_lock()->unlock(); | |
963 } | |
964 } | |
965 | |
966 // Aborted due to thread limit being reached | |
967 if (state == ZOMBIE) { | |
968 thread->set_osthread(NULL); | |
969 delete osthread; | |
970 return false; | |
971 } | |
972 | |
973 // The thread is returned suspended (in state INITIALIZED), | |
974 // and is started higher up in the call chain | |
975 assert(state == INITIALIZED, "race condition"); | |
976 return true; | |
977 } | |
978 | |
979 ///////////////////////////////////////////////////////////////////////////// | |
980 // attach existing thread | |
981 | |
982 // bootstrap the main thread | |
983 bool os::create_main_thread(JavaThread* thread) { | |
984 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
985 return create_attached_thread(thread); | |
986 } | |
987 | |
988 bool os::create_attached_thread(JavaThread* thread) { | |
989 #ifdef ASSERT | |
990 thread->verify_not_published(); | |
991 #endif | |
992 | |
993 // Allocate the OSThread object | |
994 OSThread* osthread = new OSThread(NULL, NULL); | |
995 | |
996 if (osthread == NULL) { | |
997 return false; | |
998 } | |
999 | |
1000 // Store pthread info into the OSThread | |
1001 osthread->set_thread_id(os::Linux::gettid()); | |
1002 osthread->set_pthread_id(::pthread_self()); | |
1003 | |
1004 // initialize floating point control register | |
1005 os::Linux::init_thread_fpu_state(); | |
1006 | |
1007 // Initial thread state is RUNNABLE | |
1008 osthread->set_state(RUNNABLE); | |
1009 | |
1010 thread->set_osthread(osthread); | |
1011 | |
1012 if (UseNUMA) { | |
1013 int lgrp_id = os::numa_get_group_id(); | |
1014 if (lgrp_id != -1) { | |
1015 thread->set_lgrp_id(lgrp_id); | |
1016 } | |
1017 } | |
1018 | |
1019 if (os::Linux::is_initial_thread()) { | |
1020 // If current thread is initial thread, its stack is mapped on demand, | |
1021 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
1022 // the entire stack region to avoid SEGV in stack banging. | |
1023 // It is also useful to get around the heap-stack-gap problem on SuSE | |
1024 // kernel (see 4821821 for details). We first expand stack to the top | |
1025 // of yellow zone, then enable stack yellow zone (order is significant, | |
1026 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
1027 // is no gap between the last two virtual memory regions. | |
1028 | |
1029 JavaThread *jt = (JavaThread *)thread; | |
1030 address addr = jt->stack_yellow_zone_base(); | |
1031 assert(addr != NULL, "initialization problem?"); | |
1032 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
1033 | |
1034 osthread->set_expanding_stack(); | |
1035 os::Linux::manually_expand_stack(jt, addr); | |
1036 osthread->clear_expanding_stack(); | |
1037 } | |
1038 | |
1039 // initialize signal mask for this thread | |
1040 // and save the caller's signal mask | |
1041 os::Linux::hotspot_sigmask(thread); | |
1042 | |
1043 return true; | |
1044 } | |
1045 | |
1046 void os::pd_start_thread(Thread* thread) { | |
1047 OSThread * osthread = thread->osthread(); | |
1048 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
1049 Monitor* sync_with_child = osthread->startThread_lock(); | |
1050 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
1051 sync_with_child->notify(); | |
1052 } | |
1053 | |
1054 // Free Linux resources related to the OSThread | |
1055 void os::free_thread(OSThread* osthread) { | |
1056 assert(osthread != NULL, "osthread not set"); | |
1057 | |
1058 if (Thread::current()->osthread() == osthread) { | |
1059 // Restore caller's signal mask | |
1060 sigset_t sigmask = osthread->caller_sigmask(); | |
1061 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1062 } | |
1063 | |
1064 delete osthread; | |
1065 } | |
1066 | |
1067 ////////////////////////////////////////////////////////////////////////////// | |
1068 // thread local storage | |
1069 | |
1070 int os::allocate_thread_local_storage() { | |
1071 pthread_key_t key; | |
1072 int rslt = pthread_key_create(&key, NULL); | |
1073 assert(rslt == 0, "cannot allocate thread local storage"); | |
1074 return (int)key; | |
1075 } | |
1076 | |
1077 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1078 // on VM exit. | |
1079 void os::free_thread_local_storage(int index) { | |
1080 int rslt = pthread_key_delete((pthread_key_t)index); | |
1081 assert(rslt == 0, "invalid index"); | |
1082 } | |
1083 | |
1084 void os::thread_local_storage_at_put(int index, void* value) { | |
1085 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1086 assert(rslt == 0, "pthread_setspecific failed"); | |
1087 } | |
1088 | |
1089 extern "C" Thread* get_thread() { | |
1090 return ThreadLocalStorage::thread(); | |
1091 } | |
1092 | |
1093 ////////////////////////////////////////////////////////////////////////////// | |
1094 // initial thread | |
1095 | |
1096 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1097 bool os::Linux::is_initial_thread(void) { | |
1098 char dummy; | |
1099 // If called before init complete, thread stack bottom will be null. | |
1100 // Can be called if fatal error occurs before initialization. | |
1101 if (initial_thread_stack_bottom() == NULL) return false; | |
1102 assert(initial_thread_stack_bottom() != NULL && | |
1103 initial_thread_stack_size() != 0, | |
1104 "os::init did not locate initial thread's stack region"); | |
1105 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1106 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1107 return true; | |
1108 else return false; | |
1109 } | |
1110 | |
1111 // Find the virtual memory area that contains addr | |
1112 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1113 FILE *fp = fopen("/proc/self/maps", "r"); | |
1114 if (fp) { | |
1115 address low, high; | |
1116 while (!feof(fp)) { | |
1117 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1118 if (low <= addr && addr < high) { | |
1119 if (vma_low) *vma_low = low; | |
1120 if (vma_high) *vma_high = high; | |
1121 fclose (fp); | |
1122 return true; | |
1123 } | |
1124 } | |
1125 for (;;) { | |
1126 int ch = fgetc(fp); | |
1127 if (ch == EOF || ch == (int)'\n') break; | |
1128 } | |
1129 } | |
1130 fclose(fp); | |
1131 } | |
1132 return false; | |
1133 } | |
1134 | |
1135 // Locate initial thread stack. This special handling of initial thread stack | |
1136 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1137 // bogus value for initial thread. | |
1138 void os::Linux::capture_initial_stack(size_t max_size) { | |
1139 // stack size is the easy part, get it from RLIMIT_STACK | |
1140 size_t stack_size; | |
1141 struct rlimit rlim; | |
1142 getrlimit(RLIMIT_STACK, &rlim); | |
1143 stack_size = rlim.rlim_cur; | |
1144 | |
1145 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1146 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1147 // so we won't install guard page on ld.so's data section. | |
1148 stack_size -= 2 * page_size(); | |
1149 | |
1150 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1151 // 7.1, in both cases we will get 2G in return value. | |
1152 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1153 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1154 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1155 // in case other parts in glibc still assumes 2M max stack size. | |
1156 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1157 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1158 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1159 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1160 // Try to figure out where the stack base (top) is. This is harder. |
1161 // | |
1162 // When an application is started, glibc saves the initial stack pointer in | |
1163 // a global variable "__libc_stack_end", which is then used by system | |
1164 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1165 // variable is available since the very early days. However, because it is | |
1166 // a private interface, it could disappear in the future. | |
1167 // | |
1168 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1169 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1170 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1171 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1172 // /proc/<pid>/stat could change in the future (though unlikely). | |
1173 // | |
1174 // We try __libc_stack_end first. If that doesn't work, look for | |
1175 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1176 // as a hint, which should work well in most cases. | |
1177 | |
1178 uintptr_t stack_start; | |
1179 | |
1180 // try __libc_stack_end first | |
1181 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1182 if (p && *p) { | |
1183 stack_start = *p; | |
1184 } else { | |
1185 // see if we can get the start_stack field from /proc/self/stat | |
1186 FILE *fp; | |
1187 int pid; | |
1188 char state; | |
1189 int ppid; | |
1190 int pgrp; | |
1191 int session; | |
1192 int nr; | |
1193 int tpgrp; | |
1194 unsigned long flags; | |
1195 unsigned long minflt; | |
1196 unsigned long cminflt; | |
1197 unsigned long majflt; | |
1198 unsigned long cmajflt; | |
1199 unsigned long utime; | |
1200 unsigned long stime; | |
1201 long cutime; | |
1202 long cstime; | |
1203 long prio; | |
1204 long nice; | |
1205 long junk; | |
1206 long it_real; | |
1207 uintptr_t start; | |
1208 uintptr_t vsize; | |
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1209 intptr_t rss; |
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1210 uintptr_t rsslim; |
0 | 1211 uintptr_t scodes; |
1212 uintptr_t ecode; | |
1213 int i; | |
1214 | |
1215 // Figure what the primordial thread stack base is. Code is inspired | |
1216 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1217 // followed by command name surrounded by parentheses, state, etc. | |
1218 char stat[2048]; | |
1219 int statlen; | |
1220 | |
1221 fp = fopen("/proc/self/stat", "r"); | |
1222 if (fp) { | |
1223 statlen = fread(stat, 1, 2047, fp); | |
1224 stat[statlen] = '\0'; | |
1225 fclose(fp); | |
1226 | |
1227 // Skip pid and the command string. Note that we could be dealing with | |
1228 // weird command names, e.g. user could decide to rename java launcher | |
1229 // to "java 1.4.2 :)", then the stat file would look like | |
1230 // 1234 (java 1.4.2 :)) R ... ... | |
1231 // We don't really need to know the command string, just find the last | |
1232 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1233 char * s = strrchr(stat, ')'); | |
1234 | |
1235 i = 0; | |
1236 if (s) { | |
1237 // Skip blank chars | |
1238 do s++; while (isspace(*s)); | |
1239 | |
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1240 #define _UFM UINTX_FORMAT |
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1241 #define _DFM INTX_FORMAT |
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1242 |
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1243 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1244 /* 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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1245 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 | 1246 &state, /* 3 %c */ |
1247 &ppid, /* 4 %d */ | |
1248 &pgrp, /* 5 %d */ | |
1249 &session, /* 6 %d */ | |
1250 &nr, /* 7 %d */ | |
1251 &tpgrp, /* 8 %d */ | |
1252 &flags, /* 9 %lu */ | |
1253 &minflt, /* 10 %lu */ | |
1254 &cminflt, /* 11 %lu */ | |
1255 &majflt, /* 12 %lu */ | |
1256 &cmajflt, /* 13 %lu */ | |
1257 &utime, /* 14 %lu */ | |
1258 &stime, /* 15 %lu */ | |
1259 &cutime, /* 16 %ld */ | |
1260 &cstime, /* 17 %ld */ | |
1261 &prio, /* 18 %ld */ | |
1262 &nice, /* 19 %ld */ | |
1263 &junk, /* 20 %ld */ | |
1264 &it_real, /* 21 %ld */ | |
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1265 &start, /* 22 UINTX_FORMAT */ |
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1266 &vsize, /* 23 UINTX_FORMAT */ |
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1267 &rss, /* 24 INTX_FORMAT */ |
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1268 &rsslim, /* 25 UINTX_FORMAT */ |
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1269 &scodes, /* 26 UINTX_FORMAT */ |
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1270 &ecode, /* 27 UINTX_FORMAT */ |
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1271 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1272 } |
1273 | |
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1274 #undef _UFM |
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1275 #undef _DFM |
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1276 |
0 | 1277 if (i != 28 - 2) { |
1278 assert(false, "Bad conversion from /proc/self/stat"); | |
1279 // product mode - assume we are the initial thread, good luck in the | |
1280 // embedded case. | |
1281 warning("Can't detect initial thread stack location - bad conversion"); | |
1282 stack_start = (uintptr_t) &rlim; | |
1283 } | |
1284 } else { | |
1285 // For some reason we can't open /proc/self/stat (for example, running on | |
1286 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1287 // most cases, so don't abort: | |
1288 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1289 stack_start = (uintptr_t) &rlim; | |
1290 } | |
1291 } | |
1292 | |
1293 // Now we have a pointer (stack_start) very close to the stack top, the | |
1294 // next thing to do is to figure out the exact location of stack top. We | |
1295 // can find out the virtual memory area that contains stack_start by | |
1296 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1297 // and its upper limit is the real stack top. (again, this would fail if | |
1298 // running inside chroot, because /proc may not exist.) | |
1299 | |
1300 uintptr_t stack_top; | |
1301 address low, high; | |
1302 if (find_vma((address)stack_start, &low, &high)) { | |
1303 // success, "high" is the true stack top. (ignore "low", because initial | |
1304 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1305 stack_top = (uintptr_t)high; | |
1306 } else { | |
1307 // failed, likely because /proc/self/maps does not exist | |
1308 warning("Can't detect initial thread stack location - find_vma failed"); | |
1309 // best effort: stack_start is normally within a few pages below the real | |
1310 // stack top, use it as stack top, and reduce stack size so we won't put | |
1311 // guard page outside stack. | |
1312 stack_top = stack_start; | |
1313 stack_size -= 16 * page_size(); | |
1314 } | |
1315 | |
1316 // stack_top could be partially down the page so align it | |
1317 stack_top = align_size_up(stack_top, page_size()); | |
1318 | |
1319 if (max_size && stack_size > max_size) { | |
1320 _initial_thread_stack_size = max_size; | |
1321 } else { | |
1322 _initial_thread_stack_size = stack_size; | |
1323 } | |
1324 | |
1325 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1326 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1327 } | |
1328 | |
1329 //////////////////////////////////////////////////////////////////////////////// | |
1330 // time support | |
1331 | |
1332 // Time since start-up in seconds to a fine granularity. | |
1333 // Used by VMSelfDestructTimer and the MemProfiler. | |
1334 double os::elapsedTime() { | |
1335 | |
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1336 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution |
0 | 1337 } |
1338 | |
1339 jlong os::elapsed_counter() { | |
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1340 return javaTimeNanos() - initial_time_count; |
0 | 1341 } |
1342 | |
1343 jlong os::elapsed_frequency() { | |
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1344 return NANOSECS_PER_SEC; // nanosecond resolution |
0 | 1345 } |
1346 | |
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1347 bool os::supports_vtime() { return true; } |
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1348 bool os::enable_vtime() { return false; } |
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1349 bool os::vtime_enabled() { return false; } |
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1350 |
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1351 double os::elapsedVTime() { |
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1352 struct rusage usage; |
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1353 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1354 if (retval == 0) { |
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1355 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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1356 } else { |
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1357 // better than nothing, but not much |
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1358 return elapsedTime(); |
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1359 } |
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1360 } |
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1361 |
61 | 1362 jlong os::javaTimeMillis() { |
0 | 1363 timeval time; |
1364 int status = gettimeofday(&time, NULL); | |
1365 assert(status != -1, "linux error"); | |
1366 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1367 } | |
1368 | |
1369 #ifndef CLOCK_MONOTONIC | |
1370 #define CLOCK_MONOTONIC (1) | |
1371 #endif | |
1372 | |
1373 void os::Linux::clock_init() { | |
1374 // we do dlopen's in this particular order due to bug in linux | |
1375 // dynamical loader (see 6348968) leading to crash on exit | |
1376 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1377 if (handle == NULL) { | |
1378 handle = dlopen("librt.so", RTLD_LAZY); | |
1379 } | |
1380 | |
1381 if (handle) { | |
1382 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1383 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1384 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1385 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1386 if (clock_getres_func && clock_gettime_func) { | |
1387 // See if monotonic clock is supported by the kernel. Note that some | |
1388 // early implementations simply return kernel jiffies (updated every | |
1389 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1390 // for nano time (though the monotonic property is still nice to have). | |
1391 // It's fixed in newer kernels, however clock_getres() still returns | |
1392 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1393 // resolution for now. Hopefully as people move to new kernels, this | |
1394 // won't be a problem. | |
1395 struct timespec res; | |
1396 struct timespec tp; | |
1397 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1398 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1399 // yes, monotonic clock is supported | |
1400 _clock_gettime = clock_gettime_func; | |
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1401 return; |
0 | 1402 } else { |
1403 // close librt if there is no monotonic clock | |
1404 dlclose(handle); | |
1405 } | |
1406 } | |
1407 } | |
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1408 warning("No monotonic clock was available - timed services may " \ |
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1409 "be adversely affected if the time-of-day clock changes"); |
0 | 1410 } |
1411 | |
1412 #ifndef SYS_clock_getres | |
1413 | |
1414 #if defined(IA32) || defined(AMD64) | |
1415 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1416 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1417 #else |
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1418 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1419 #define sys_clock_getres(x,y) -1 |
0 | 1420 #endif |
1421 | |
1681
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1422 #else |
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1423 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1424 #endif |
1425 | |
1426 void os::Linux::fast_thread_clock_init() { | |
1427 if (!UseLinuxPosixThreadCPUClocks) { | |
1428 return; | |
1429 } | |
1430 clockid_t clockid; | |
1431 struct timespec tp; | |
1432 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1433 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1434 | |
1435 // Switch to using fast clocks for thread cpu time if | |
1436 // the sys_clock_getres() returns 0 error code. | |
1437 // Note, that some kernels may support the current thread | |
1438 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1439 // returned by the pthread_getcpuclockid(). | |
1440 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1441 // must return at least tp.tv_sec == 0 which means a resolution | |
1442 // better than 1 sec. This is extra check for reliability. | |
1443 | |
1444 if(pthread_getcpuclockid_func && | |
1445 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1446 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1447 | |
1448 _supports_fast_thread_cpu_time = true; | |
1449 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1450 } | |
1451 } | |
1452 | |
1453 jlong os::javaTimeNanos() { | |
14909 | 1454 if (Linux::supports_monotonic_clock()) { |
0 | 1455 struct timespec tp; |
1456 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1457 assert(status == 0, "gettime error"); | |
1458 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1459 return result; | |
1460 } else { | |
1461 timeval time; | |
1462 int status = gettimeofday(&time, NULL); | |
1463 assert(status != -1, "linux error"); | |
1464 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1465 return 1000 * usecs; | |
1466 } | |
1467 } | |
1468 | |
1469 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
14909 | 1470 if (Linux::supports_monotonic_clock()) { |
0 | 1471 info_ptr->max_value = ALL_64_BITS; |
1472 | |
1473 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1474 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1475 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1476 } else { | |
1477 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1478 info_ptr->max_value = ALL_64_BITS; | |
1479 | |
1480 // gettimeofday is a real time clock so it skips | |
1481 info_ptr->may_skip_backward = true; | |
1482 info_ptr->may_skip_forward = true; | |
1483 } | |
1484 | |
1485 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1486 } | |
1487 | |
1488 // Return the real, user, and system times in seconds from an | |
1489 // arbitrary fixed point in the past. | |
1490 bool os::getTimesSecs(double* process_real_time, | |
1491 double* process_user_time, | |
1492 double* process_system_time) { | |
1493 struct tms ticks; | |
1494 clock_t real_ticks = times(&ticks); | |
1495 | |
1496 if (real_ticks == (clock_t) (-1)) { | |
1497 return false; | |
1498 } else { | |
1499 double ticks_per_second = (double) clock_tics_per_sec; | |
1500 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1501 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1502 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1503 | |
1504 return true; | |
1505 } | |
1506 } | |
1507 | |
1508 | |
1509 char * os::local_time_string(char *buf, size_t buflen) { | |
1510 struct tm t; | |
1511 time_t long_time; | |
1512 time(&long_time); | |
1513 localtime_r(&long_time, &t); | |
1514 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1515 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1516 t.tm_hour, t.tm_min, t.tm_sec); | |
1517 return buf; | |
1518 } | |
1519 | |
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1520 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1521 return localtime_r(clock, res); |
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1522 } |
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1523 |
0 | 1524 //////////////////////////////////////////////////////////////////////////////// |
1525 // runtime exit support | |
1526 | |
1527 // Note: os::shutdown() might be called very early during initialization, or | |
1528 // called from signal handler. Before adding something to os::shutdown(), make | |
1529 // sure it is async-safe and can handle partially initialized VM. | |
1530 void os::shutdown() { | |
1531 | |
1532 // allow PerfMemory to attempt cleanup of any persistent resources | |
1533 perfMemory_exit(); | |
1534 | |
1535 // needs to remove object in file system | |
1536 AttachListener::abort(); | |
1537 | |
1538 // flush buffered output, finish log files | |
1539 ostream_abort(); | |
1540 | |
1541 // Check for abort hook | |
1542 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1543 if (abort_hook != NULL) { | |
1544 abort_hook(); | |
1545 } | |
1546 | |
1547 } | |
1548 | |
1549 // Note: os::abort() might be called very early during initialization, or | |
1550 // called from signal handler. Before adding something to os::abort(), make | |
1551 // sure it is async-safe and can handle partially initialized VM. | |
1552 void os::abort(bool dump_core) { | |
1553 os::shutdown(); | |
1554 if (dump_core) { | |
1555 #ifndef PRODUCT | |
1556 fdStream out(defaultStream::output_fd()); | |
1557 out.print_raw("Current thread is "); | |
1558 char buf[16]; | |
1559 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1560 out.print_raw_cr(buf); | |
1561 out.print_raw_cr("Dumping core ..."); | |
1562 #endif | |
1563 ::abort(); // dump core | |
1564 } | |
1565 | |
1566 ::exit(1); | |
1567 } | |
1568 | |
1569 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1570 void os::die() { | |
1571 // _exit() on LinuxThreads only kills current thread | |
1572 ::abort(); | |
1573 } | |
1574 | |
1575 // unused on linux for now. | |
1576 void os::set_error_file(const char *logfile) {} | |
1577 | |
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1578 |
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|
1579 // This method is a copy of JDK's sysGetLastErrorString |
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1580 // from src/solaris/hpi/src/system_md.c |
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1581 |
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|
1582 size_t os::lasterror(char *buf, size_t len) { |
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|
1583 |
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|
1584 if (errno == 0) return 0; |
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|
1585 |
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|
1586 const char *s = ::strerror(errno); |
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diff
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|
1587 size_t n = ::strlen(s); |
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|
1588 if (n >= len) { |
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|
1589 n = len - 1; |
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|
1590 } |
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diff
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|
1591 ::strncpy(buf, s, n); |
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diff
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|
1592 buf[n] = '\0'; |
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|
1593 return n; |
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|
1594 } |
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|
1595 |
0 | 1596 intx os::current_thread_id() { return (intx)pthread_self(); } |
1597 int os::current_process_id() { | |
1598 | |
1599 // Under the old linux thread library, linux gives each thread | |
1600 // its own process id. Because of this each thread will return | |
1601 // a different pid if this method were to return the result | |
1602 // of getpid(2). Linux provides no api that returns the pid | |
1603 // of the launcher thread for the vm. This implementation | |
1604 // returns a unique pid, the pid of the launcher thread | |
1605 // that starts the vm 'process'. | |
1606 | |
1607 // Under the NPTL, getpid() returns the same pid as the | |
1608 // launcher thread rather than a unique pid per thread. | |
1609 // Use gettid() if you want the old pre NPTL behaviour. | |
1610 | |
1611 // if you are looking for the result of a call to getpid() that | |
1612 // returns a unique pid for the calling thread, then look at the | |
1613 // OSThread::thread_id() method in osThread_linux.hpp file | |
1614 | |
1615 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1616 } | |
1617 | |
1618 // DLL functions | |
1619 | |
1620 const char* os::dll_file_extension() { return ".so"; } | |
1621 | |
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|
1622 // This must be hard coded because it's the system's temporary |
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1623 // directory not the java application's temp directory, ala java.io.tmpdir. |
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|
1624 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1625 |
691 | 1626 static bool file_exists(const char* filename) { |
1627 struct stat statbuf; | |
1628 if (filename == NULL || strlen(filename) == 0) { | |
1629 return false; | |
1630 } | |
1631 return os::stat(filename, &statbuf) == 0; | |
1632 } | |
1633 | |
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|
1634 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1635 const char* pname, const char* fname) { |
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|
1636 bool retval = false; |
691 | 1637 // Copied from libhpi |
242 | 1638 const size_t pnamelen = pname ? strlen(pname) : 0; |
1639 | |
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|
1640 // Return error on buffer overflow. |
242 | 1641 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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diff
changeset
|
1642 return retval; |
242 | 1643 } |
1644 | |
1645 if (pnamelen == 0) { | |
691 | 1646 snprintf(buffer, buflen, "lib%s.so", fname); |
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6825
diff
changeset
|
1647 retval = true; |
691 | 1648 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1649 int n; | |
1650 char** pelements = split_path(pname, &n); | |
9059
17bf4d428955
8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
ccheung
parents:
8812
diff
changeset
|
1651 if (pelements == NULL) { |
9062 | 1652 return false; |
9059
17bf4d428955
8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
ccheung
parents:
8812
diff
changeset
|
1653 } |
691 | 1654 for (int i = 0 ; i < n ; i++) { |
1655 // Really shouldn't be NULL, but check can't hurt | |
1656 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1657 continue; // skip the empty path values | |
1658 } | |
1659 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1660 if (file_exists(buffer)) { | |
6966
6cb0d32b828b
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parents:
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diff
changeset
|
1661 retval = true; |
691 | 1662 break; |
1663 } | |
1664 } | |
1665 // release the storage | |
1666 for (int i = 0 ; i < n ; i++) { | |
1667 if (pelements[i] != NULL) { | |
6197 | 1668 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1669 } |
1670 } | |
1671 if (pelements != NULL) { | |
6197 | 1672 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1673 } |
242 | 1674 } else { |
691 | 1675 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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bpittore
parents:
6825
diff
changeset
|
1676 retval = true; |
6cb0d32b828b
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bpittore
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diff
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|
1677 } |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
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diff
changeset
|
1678 return retval; |
242 | 1679 } |
1680 | |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
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changeset
|
1681 // check if addr is inside libjvm.so |
0 | 1682 bool os::address_is_in_vm(address addr) { |
1683 static address libjvm_base_addr; | |
1684 Dl_info dlinfo; | |
1685 | |
1686 if (libjvm_base_addr == NULL) { | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1687 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1688 libjvm_base_addr = (address)dlinfo.dli_fbase; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1689 } |
0 | 1690 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1691 } | |
1692 | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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changeset
|
1693 if (dladdr((void *)addr, &dlinfo) != 0) { |
0 | 1694 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1695 } | |
1696 | |
1697 return false; | |
1698 } | |
1699 | |
1700 bool os::dll_address_to_function_name(address addr, char *buf, | |
1701 int buflen, int *offset) { | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1702 // buf is not optional, but offset is optional |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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|
1703 assert(buf != NULL, "sanity check"); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1704 |
0 | 1705 Dl_info dlinfo; |
1706 | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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|
1707 if (dladdr((void*)addr, &dlinfo) != 0) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1708 // see if we have a matching symbol |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
changeset
|
1709 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
59b052799158
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dcubed
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|
1710 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
zgu
parents:
1972
diff
changeset
|
1711 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
zgu
parents:
1972
diff
changeset
|
1712 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1713 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1714 return true; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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diff
changeset
|
1715 } |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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changeset
|
1716 // no matching symbol so try for just file info |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1717 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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changeset
|
1718 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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changeset
|
1719 buf, buflen, offset, dlinfo.dli_fname)) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
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diff
changeset
|
1720 return true; |
59b052799158
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changeset
|
1721 } |
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
zgu
parents:
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diff
changeset
|
1722 } |
11092
59b052799158
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changeset
|
1723 } |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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changeset
|
1724 |
59b052799158
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changeset
|
1725 buf[0] = '\0'; |
2022
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7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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parents:
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diff
changeset
|
1726 if (offset != NULL) *offset = -1; |
2d4762ec74af
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changeset
|
1727 return false; |
0 | 1728 } |
1729 | |
1730 struct _address_to_library_name { | |
1731 address addr; // input : memory address | |
1732 size_t buflen; // size of fname | |
1733 char* fname; // output: library name | |
1734 address base; // library base addr | |
1735 }; | |
1736 | |
1737 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1738 size_t size, void *data) { | |
1739 int i; | |
1740 bool found = false; | |
1741 address libbase = NULL; | |
1742 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1743 | |
1744 // iterate through all loadable segments | |
1745 for (i = 0; i < info->dlpi_phnum; i++) { | |
1746 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1747 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1748 // base address of a library is the lowest address of its loaded | |
1749 // segments. | |
1750 if (libbase == NULL || libbase > segbase) { | |
1751 libbase = segbase; | |
1752 } | |
1753 // see if 'addr' is within current segment | |
1754 if (segbase <= d->addr && | |
1755 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1756 found = true; | |
1757 } | |
1758 } | |
1759 } | |
1760 | |
1761 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1762 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1763 // can figure out executable name from argv[0]. | |
1764 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1765 d->base = libbase; | |
1766 if (d->fname) { | |
1767 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1768 } | |
1769 return 1; | |
1770 } | |
1771 return 0; | |
1772 } | |
1773 | |
1774 bool os::dll_address_to_library_name(address addr, char* buf, | |
1775 int buflen, int* offset) { | |
11092
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|
1776 // buf is not optional, but offset is optional |
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|
1777 assert(buf != NULL, "sanity check"); |
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|
1778 |
0 | 1779 Dl_info dlinfo; |
1780 struct _address_to_library_name data; | |
1781 | |
1782 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1783 // to wrong library name if the .so file has a base address != NULL. Here | |
1784 // we iterate through the program headers of all loaded libraries to find | |
1785 // out which library 'addr' really belongs to. This workaround can be | |
1786 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1787 data.addr = addr; | |
1788 data.fname = buf; | |
1789 data.buflen = buflen; | |
1790 data.base = NULL; | |
1791 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1792 | |
1793 if (rslt) { | |
1794 // buf already contains library name | |
1795 if (offset) *offset = addr - data.base; | |
1796 return true; | |
11092
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|
1797 } |
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|
1798 if (dladdr((void*)addr, &dlinfo) != 0) { |
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|
1799 if (dlinfo.dli_fname != NULL) { |
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|
1800 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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|
1801 } |
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|
1802 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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|
1803 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1804 } |
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|
1805 return true; |
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|
1806 } |
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|
1807 |
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|
1808 buf[0] = '\0'; |
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|
1809 if (offset) *offset = -1; |
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|
1810 return false; |
0 | 1811 } |
1812 | |
1813 // Loads .dll/.so and | |
1814 // in case of error it checks if .dll/.so was built for the | |
1815 // same architecture as Hotspot is running on | |
1816 | |
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1817 |
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|
1818 // Remember the stack's state. The Linux dynamic linker will change |
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1819 // the stack to 'executable' at most once, so we must safepoint only once. |
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|
1820 bool os::Linux::_stack_is_executable = false; |
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1821 |
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1822 // VM operation that loads a library. This is necessary if stack protection |
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1823 // of the Java stacks can be lost during loading the library. If we |
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1824 // do not stop the Java threads, they can stack overflow before the stacks |
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1825 // are protected again. |
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|
1826 class VM_LinuxDllLoad: public VM_Operation { |
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|
1827 private: |
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1828 const char *_filename; |
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|
1829 char *_ebuf; |
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|
1830 int _ebuflen; |
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1831 void *_lib; |
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1832 public: |
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|
1833 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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|
1834 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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|
1835 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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|
1836 void doit() { |
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|
1837 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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|
1838 os::Linux::_stack_is_executable = true; |
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|
1839 } |
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|
1840 void* loaded_library() { return _lib; } |
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|
1841 }; |
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|
1842 |
0 | 1843 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1844 { | |
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|
1845 void * result = NULL; |
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|
1846 bool load_attempted = false; |
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|
1847 |
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|
1848 // Check whether the library to load might change execution rights |
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|
1849 // of the stack. If they are changed, the protection of the stack |
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|
1850 // guard pages will be lost. We need a safepoint to fix this. |
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|
1851 // |
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|
1852 // See Linux man page execstack(8) for more info. |
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|
1853 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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|
1854 ElfFile ef(filename); |
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|
1855 if (!ef.specifies_noexecstack()) { |
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1856 if (!is_init_completed()) { |
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1857 os::Linux::_stack_is_executable = true; |
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1858 // This is OK - No Java threads have been created yet, and hence no |
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1859 // stack guard pages to fix. |
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1860 // |
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1861 // This should happen only when you are building JDK7 using a very |
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1862 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1863 // |
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1864 // Dynamic loader will make all stacks executable after |
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1865 // this function returns, and will not do that again. |
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1866 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1867 } else { |
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1868 warning("You have loaded library %s which might have disabled stack guard. " |
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1869 "The VM will try to fix the stack guard now.\n" |
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1870 "It's highly recommended that you fix the library with " |
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1871 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1872 filename); |
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1873 |
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1874 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1875 JavaThread *jt = JavaThread::current(); |
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1876 if (jt->thread_state() != _thread_in_native) { |
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1877 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1878 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1879 warning("Unable to fix stack guard. Giving up."); |
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1880 } else { |
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1881 if (!LoadExecStackDllInVMThread) { |
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1882 // This is for the case where the DLL has an static |
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1883 // constructor function that executes JNI code. We cannot |
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1884 // load such DLLs in the VMThread. |
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1885 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1886 } |
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1887 |
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1888 ThreadInVMfromNative tiv(jt); |
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1889 debug_only(VMNativeEntryWrapper vew;) |
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1890 |
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1891 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1892 VMThread::execute(&op); |
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1893 if (LoadExecStackDllInVMThread) { |
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1894 result = op.loaded_library(); |
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1895 } |
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1896 load_attempted = true; |
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1897 } |
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1898 } |
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1899 } |
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1900 } |
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1901 |
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1902 if (!load_attempted) { |
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1903 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1904 } |
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1905 |
0 | 1906 if (result != NULL) { |
1907 // Successful loading | |
1908 return result; | |
1909 } | |
1910 | |
1911 Elf32_Ehdr elf_head; | |
1912 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1913 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1914 | |
1915 if (diag_msg_max_length==0) { | |
1916 // No more space in ebuf for additional diagnostics message | |
1917 return NULL; | |
1918 } | |
1919 | |
1920 | |
1921 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1922 | |
1923 if (file_descriptor < 0) { | |
1924 // Can't open library, report dlerror() message | |
1925 return NULL; | |
1926 } | |
1927 | |
1928 bool failed_to_read_elf_head= | |
1929 (sizeof(elf_head)!= | |
1930 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1931 | |
1932 ::close(file_descriptor); | |
1933 if (failed_to_read_elf_head) { | |
1934 // file i/o error - report dlerror() msg | |
1935 return NULL; | |
1936 } | |
1937 | |
1938 typedef struct { | |
1939 Elf32_Half code; // Actual value as defined in elf.h | |
1940 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1941 char elf_class; // 32 or 64 bit | |
1942 char endianess; // MSB or LSB | |
1943 char* name; // String representation | |
1944 } arch_t; | |
1945 | |
1946 #ifndef EM_486 | |
1947 #define EM_486 6 /* Intel 80486 */ | |
1948 #endif | |
1949 | |
1950 static const arch_t arch_array[]={ | |
1951 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1952 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1953 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1954 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1955 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1956 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1957 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1958 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1010 | 1959 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
1960 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1961 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1962 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1963 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1964 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1965 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1966 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1967 }; |
1968 | |
1969 #if (defined IA32) | |
1970 static Elf32_Half running_arch_code=EM_386; | |
1971 #elif (defined AMD64) | |
1972 static Elf32_Half running_arch_code=EM_X86_64; | |
1973 #elif (defined IA64) | |
1974 static Elf32_Half running_arch_code=EM_IA_64; | |
1975 #elif (defined __sparc) && (defined _LP64) | |
1976 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1977 #elif (defined __sparc) && (!defined _LP64) | |
1978 static Elf32_Half running_arch_code=EM_SPARC; | |
1979 #elif (defined __powerpc64__) | |
1980 static Elf32_Half running_arch_code=EM_PPC64; | |
1981 #elif (defined __powerpc__) | |
1982 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1983 #elif (defined ARM) |
1984 static Elf32_Half running_arch_code=EM_ARM; | |
1985 #elif (defined S390) | |
1986 static Elf32_Half running_arch_code=EM_S390; | |
1987 #elif (defined ALPHA) | |
1988 static Elf32_Half running_arch_code=EM_ALPHA; | |
1989 #elif (defined MIPSEL) | |
1990 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1991 #elif (defined PARISC) | |
1992 static Elf32_Half running_arch_code=EM_PARISC; | |
1993 #elif (defined MIPS) | |
1994 static Elf32_Half running_arch_code=EM_MIPS; | |
1995 #elif (defined M68K) | |
1996 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1997 #else |
1998 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1999 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 2000 #endif |
2001 | |
2002 // Identify compatability class for VM's architecture and library's architecture | |
2003 // Obtain string descriptions for architectures | |
2004 | |
2005 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
2006 int running_arch_index=-1; | |
2007 | |
2008 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
2009 if (running_arch_code == arch_array[i].code) { | |
2010 running_arch_index = i; | |
2011 } | |
2012 if (lib_arch.code == arch_array[i].code) { | |
2013 lib_arch.compat_class = arch_array[i].compat_class; | |
2014 lib_arch.name = arch_array[i].name; | |
2015 } | |
2016 } | |
2017 | |
2018 assert(running_arch_index != -1, | |
2019 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
2020 if (running_arch_index == -1) { | |
2021 // Even though running architecture detection failed | |
2022 // we may still continue with reporting dlerror() message | |
2023 return NULL; | |
2024 } | |
2025 | |
2026 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
2027 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
2028 return NULL; | |
2029 } | |
2030 | |
1010 | 2031 #ifndef S390 |
0 | 2032 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
2033 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
2034 return NULL; | |
2035 } | |
1010 | 2036 #endif // !S390 |
0 | 2037 |
2038 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
2039 if ( lib_arch.name!=NULL ) { | |
2040 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2041 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
2042 lib_arch.name, arch_array[running_arch_index].name); | |
2043 } else { | |
2044 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2045 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
2046 lib_arch.code, | |
2047 arch_array[running_arch_index].name); | |
2048 } | |
2049 } | |
2050 | |
2051 return NULL; | |
2052 } | |
2053 | |
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2054 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2055 void * result = ::dlopen(filename, RTLD_LAZY); |
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2056 if (result == NULL) { |
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2057 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2058 ebuf[ebuflen-1] = '\0'; |
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2059 } |
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2060 return result; |
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2061 } |
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2062 |
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2063 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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2064 void * result = NULL; |
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2065 if (LoadExecStackDllInVMThread) { |
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2066 result = dlopen_helper(filename, ebuf, ebuflen); |
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2067 } |
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2068 |
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2069 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2070 // library that requires an executable stack, or which does not have this |
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2071 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2072 // read protection of the guard pages gets lost. |
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2073 // |
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2074 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2075 // may have been queued at the same time. |
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2076 |
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2077 if (!_stack_is_executable) { |
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2078 JavaThread *jt = Threads::first(); |
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2079 |
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2080 while (jt) { |
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2081 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2082 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2083 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2084 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2085 warning("Attempt to reguard stack yellow zone failed."); |
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2086 } |
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7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2087 } |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2088 jt = jt->next(); |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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8675
diff
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|
2089 } |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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diff
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|
2090 } |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2091 |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2092 return result; |
9058789475af
7107135: Stack guard pages are no more protected after loading a shared library with executable stack
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|
2093 } |
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|
2094 |
242 | 2095 /* |
2096 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2097 * chances are you might want to run the generated bits against glibc-2.0 | |
2098 * libdl.so, so always use locking for any version of glibc. | |
2099 */ | |
2100 void* os::dll_lookup(void* handle, const char* name) { | |
2101 pthread_mutex_lock(&dl_mutex); | |
2102 void* res = dlsym(handle, name); | |
2103 pthread_mutex_unlock(&dl_mutex); | |
2104 return res; | |
2105 } | |
0 | 2106 |
2107 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
2108 static bool _print_ascii_file(const char* filename, outputStream* st) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
2109 int fd = ::open(filename, O_RDONLY); |
0 | 2110 if (fd == -1) { |
2111 return false; | |
2112 } | |
2113 | |
2114 char buf[32]; | |
2115 int bytes; | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
2116 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2117 st->print_raw(buf, bytes); |
2118 } | |
2119 | |
1980
828eafbd85cc
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|
2120 ::close(fd); |
0 | 2121 |
2122 return true; | |
2123 } | |
2124 | |
2125 void os::print_dll_info(outputStream *st) { | |
2126 st->print_cr("Dynamic libraries:"); | |
2127 | |
2128 char fname[32]; | |
2129 pid_t pid = os::Linux::gettid(); | |
2130 | |
2131 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2132 | |
2133 if (!_print_ascii_file(fname, st)) { | |
2134 st->print("Can not get library information for pid = %d\n", pid); | |
2135 } | |
2136 } | |
2137 | |
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|
2138 void os::print_os_info_brief(outputStream* st) { |
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|
2139 os::Linux::print_distro_info(st); |
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|
2140 |
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|
2141 os::Posix::print_uname_info(st); |
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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 } |
0 | 2146 |
2147 void os::print_os_info(outputStream* st) { | |
2148 st->print("OS:"); | |
2149 | |
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|
2150 os::Linux::print_distro_info(st); |
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|
2151 |
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|
2152 os::Posix::print_uname_info(st); |
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|
2153 |
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|
2154 // Print warning if unsafe chroot environment detected |
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|
2155 if (unsafe_chroot_detected) { |
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|
2156 st->print("WARNING!! "); |
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|
2157 st->print_cr(unstable_chroot_error); |
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|
2158 } |
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|
2159 |
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|
2160 os::Linux::print_libversion_info(st); |
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|
2161 |
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|
2162 os::Posix::print_rlimit_info(st); |
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|
2163 |
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|
2164 os::Posix::print_load_average(st); |
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|
2165 |
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|
2166 os::Linux::print_full_memory_info(st); |
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|
2167 } |
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|
2168 |
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|
2169 // 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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parents:
12211
diff
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|
2170 // 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"
dcubed
parents:
12211
diff
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|
2171 // 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"
dcubed
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12211
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|
2172 // 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"
dcubed
parents:
12211
diff
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|
2173 // /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"
dcubed
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12211
diff
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|
2174 // /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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|
2175 // 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"
dcubed
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diff
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|
2176 // 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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12211
diff
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|
2177 // 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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12211
diff
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|
2178 // redhat-release file. |
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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|
2179 // 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"
dcubed
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12211
diff
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|
2180 // search for redhat-release needs to be before lsb-release. |
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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|
2181 // 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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12211
diff
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|
2182 // before the older style release files. |
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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|
2183 // 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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12211
diff
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|
2184 // 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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12211
diff
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|
2185 // 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"
dcubed
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12211
diff
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|
2186 // standard that has been replaced by the lsb-release and os-release files. |
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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|
2187 // 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"
dcubed
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12211
diff
changeset
|
2188 // 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"
dcubed
parents:
12211
diff
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|
2189 // "Debian " is printed before the contents of the debian_version file. |
6080
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|
2190 void os::Linux::print_distro_info(outputStream* st) { |
12212
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
parents:
12211
diff
changeset
|
2191 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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parents:
12211
diff
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|
2192 !_print_ascii_file("/etc/mandriva-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
parents:
12211
diff
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|
2193 !_print_ascii_file("/etc/mandrake-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
parents:
12211
diff
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|
2194 !_print_ascii_file("/etc/sun-release", st) && |
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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|
2195 !_print_ascii_file("/etc/redhat-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
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12211
diff
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|
2196 !_print_ascii_file("/etc/lsb-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
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12211
diff
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|
2197 !_print_ascii_file("/etc/SuSE-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
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12211
diff
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|
2198 !_print_ascii_file("/etc/turbolinux-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
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12211
diff
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|
2199 !_print_ascii_file("/etc/gentoo-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
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12211
diff
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|
2200 !_print_ascii_file("/etc/ltib-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
parents:
12211
diff
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|
2201 !_print_ascii_file("/etc/angstrom-version", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
dcubed
parents:
12211
diff
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|
2202 !_print_ascii_file("/etc/system-release", st) && |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
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|
2203 !_print_ascii_file("/etc/os-release", st)) { |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
diff
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|
2204 |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2205 if (file_exists("/etc/debian_version")) { |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
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|
2206 st->print("Debian "); |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
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|
2207 _print_ascii_file("/etc/debian_version", st); |
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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|
2208 } else { |
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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|
2209 st->print("Linux"); |
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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12211
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|
2210 } |
4472884d8b37
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|
2211 } |
4472884d8b37
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|
2212 st->cr(); |
6080
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7165755: OS Information much longer on linux than other platforms
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|
2213 } |
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|
2214 |
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|
2215 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2216 // libc, pthread |
2217 st->print("libc:"); | |
2218 st->print(os::Linux::glibc_version()); st->print(" "); | |
2219 st->print(os::Linux::libpthread_version()); st->print(" "); | |
2220 if (os::Linux::is_LinuxThreads()) { | |
2221 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2222 } | |
2223 st->cr(); | |
6080
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|
2224 } |
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|
2225 |
7432b9db36ff
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|
2226 void os::Linux::print_full_memory_info(outputStream* st) { |
7432b9db36ff
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|
2227 st->print("\n/proc/meminfo:\n"); |
7432b9db36ff
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|
2228 _print_ascii_file("/proc/meminfo", st); |
7432b9db36ff
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|
2229 st->cr(); |
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
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3358
diff
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|
2230 } |
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
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diff
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|
2231 |
0 | 2232 void os::print_memory_info(outputStream* st) { |
2233 | |
2234 st->print("Memory:"); | |
2235 st->print(" %dk page", os::vm_page_size()>>10); | |
2236 | |
2237 // values in struct sysinfo are "unsigned long" | |
2238 struct sysinfo si; | |
2239 sysinfo(&si); | |
2240 | |
2241 st->print(", physical " UINT64_FORMAT "k", | |
2242 os::physical_memory() >> 10); | |
2243 st->print("(" UINT64_FORMAT "k free)", | |
2244 os::available_memory() >> 10); | |
2245 st->print(", swap " UINT64_FORMAT "k", | |
2246 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2247 st->print("(" UINT64_FORMAT "k free)", | |
2248 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2249 st->cr(); | |
2250 } | |
2251 | |
6080
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|
2252 void os::pd_print_cpu_info(outputStream* st) { |
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|
2253 st->print("\n/proc/cpuinfo:\n"); |
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|
2254 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
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|
2255 st->print(" <Not Available>"); |
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|
2256 } |
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|
2257 st->cr(); |
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|
2258 } |
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|
2259 |
14909 | 2260 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific |
2261 // but they're the same for all the linux arch that we support | |
2262 // and they're the same for solaris but there's no common place to put this. | |
2263 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
2264 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
2265 "ILL_COPROC", "ILL_BADSTK" }; | |
2266 | |
2267 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
2268 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
2269 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
2270 | |
2271 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
2272 | |
2273 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
2274 | |
0 | 2275 void os::print_siginfo(outputStream* st, void* siginfo) { |
14909 | 2276 st->print("siginfo:"); |
2277 | |
2278 const int buflen = 100; | |
2279 char buf[buflen]; | |
2280 siginfo_t *si = (siginfo_t*)siginfo; | |
2281 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
2282 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
2283 st->print("si_errno=%s", buf); | |
2284 } else { | |
2285 st->print("si_errno=%d", si->si_errno); | |
2286 } | |
2287 const int c = si->si_code; | |
2288 assert(c > 0, "unexpected si_code"); | |
2289 switch (si->si_signo) { | |
2290 case SIGILL: | |
2291 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
2292 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2293 break; | |
2294 case SIGFPE: | |
2295 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
2296 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2297 break; | |
2298 case SIGSEGV: | |
2299 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
2300 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2301 break; | |
2302 case SIGBUS: | |
2303 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
2304 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2305 break; | |
2306 default: | |
2307 st->print(", si_code=%d", si->si_code); | |
2308 // no si_addr | |
2309 } | |
2310 | |
2311 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
0 | 2312 UseSharedSpaces) { |
2313 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2314 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2315 st->print("\n\nError accessing class data sharing archive." \ | |
2316 " Mapped file inaccessible during execution, " \ | |
2317 " possible disk/network problem."); | |
2318 } | |
2319 } | |
2320 st->cr(); | |
2321 } | |
2322 | |
2323 | |
2324 static void print_signal_handler(outputStream* st, int sig, | |
2325 char* buf, size_t buflen); | |
2326 | |
2327 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2328 st->print_cr("Signal Handlers:"); | |
2329 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2330 print_signal_handler(st, SIGBUS , buf, buflen); | |
2331 print_signal_handler(st, SIGFPE , buf, buflen); | |
2332 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2333 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2334 print_signal_handler(st, SIGILL , buf, buflen); | |
2335 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2336 print_signal_handler(st, SR_signum, buf, buflen); | |
2337 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2338 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2339 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2340 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
2341 } | |
2342 | |
2343 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2344 | |
7456
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7206
diff
changeset
|
2345 // Find the full path to the current module, libjvm.so |
1642 | 2346 void os::jvm_path(char *buf, jint buflen) { |
0 | 2347 // Error checking. |
1642 | 2348 if (buflen < MAXPATHLEN) { |
0 | 2349 assert(false, "must use a large-enough buffer"); |
2350 buf[0] = '\0'; | |
2351 return; | |
2352 } | |
2353 // Lazy resolve the path to current module. | |
2354 if (saved_jvm_path[0] != 0) { | |
2355 strcpy(buf, saved_jvm_path); | |
2356 return; | |
2357 } | |
2358 | |
2359 char dli_fname[MAXPATHLEN]; | |
2360 bool ret = dll_address_to_library_name( | |
2361 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2362 dli_fname, sizeof(dli_fname), NULL); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2363 assert(ret, "cannot locate libjvm"); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2364 char *rp = NULL; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2365 if (ret && dli_fname[0] != '\0') { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2366 rp = realpath(dli_fname, buf); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2367 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2368 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2369 return; |
0 | 2370 |
14909 | 2371 if (Arguments::created_by_gamma_launcher()) { |
2372 // Support for the gamma launcher. Typical value for buf is | |
2373 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2374 // the right place in the string, then assume we are installed in a JDK and | |
2375 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2376 // up the path so it looks like libjvm.so is installed there (append a | |
2377 // fake suffix hotspot/libjvm.so). | |
0 | 2378 const char *p = buf + strlen(buf) - 1; |
2379 for (int count = 0; p > buf && count < 5; ++count) { | |
2380 for (--p; p > buf && *p != '/'; --p) | |
2381 /* empty */ ; | |
2382 } | |
2383 | |
2384 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2385 // Look for JAVA_HOME in the environment. | |
2386 char* java_home_var = ::getenv("JAVA_HOME"); | |
2387 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2388 char* jrelib_p; |
2389 int len; | |
2390 | |
7456
7d42f3b08300
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dcubed
parents:
7206
diff
changeset
|
2391 // Check the current module name "libjvm.so". |
0 | 2392 p = strrchr(buf, '/'); |
2393 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2394 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2395 rp = realpath(java_home_var, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2396 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2397 return; |
1642 | 2398 |
2399 // determine if this is a legacy image or modules image | |
2400 // modules image doesn't have "jre" subdirectory | |
2401 len = strlen(buf); | |
2402 jrelib_p = buf + len; | |
2403 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2404 if (0 != access(buf, F_OK)) { | |
2405 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2406 } | |
2407 | |
0 | 2408 if (0 == access(buf, F_OK)) { |
7456
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dcubed
parents:
7206
diff
changeset
|
2409 // Use current module name "libjvm.so" |
1642 | 2410 len = strlen(buf); |
7456
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dcubed
parents:
7206
diff
changeset
|
2411 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2412 } else { |
2413 // Go back to path of .so | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2414 rp = realpath(dli_fname, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2415 if (rp == NULL) |
513
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xlu
parents:
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diff
changeset
|
2416 return; |
0 | 2417 } |
2418 } | |
2419 } | |
2420 } | |
2421 | |
2422 strcpy(saved_jvm_path, buf); | |
2423 } | |
2424 | |
2425 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2426 // no prefix required, not even "_" | |
2427 } | |
2428 | |
2429 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2430 // no suffix required | |
2431 } | |
2432 | |
2433 //////////////////////////////////////////////////////////////////////////////// | |
2434 // sun.misc.Signal support | |
2435 | |
2436 static volatile jint sigint_count = 0; | |
2437 | |
2438 static void | |
2439 UserHandler(int sig, void *siginfo, void *context) { | |
2440 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2441 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2442 // don't want to flood the manager thread with sem_post requests. | |
2443 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2444 return; | |
2445 | |
2446 // Ctrl-C is pressed during error reporting, likely because the error | |
2447 // handler fails to abort. Let VM die immediately. | |
2448 if (sig == SIGINT && is_error_reported()) { | |
2449 os::die(); | |
2450 } | |
2451 | |
2452 os::signal_notify(sig); | |
2453 } | |
2454 | |
2455 void* os::user_handler() { | |
2456 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2457 } | |
2458 | |
10405 | 2459 class Semaphore : public StackObj { |
2460 public: | |
2461 Semaphore(); | |
2462 ~Semaphore(); | |
2463 void signal(); | |
2464 void wait(); | |
2465 bool trywait(); | |
2466 bool timedwait(unsigned int sec, int nsec); | |
2467 private: | |
2468 sem_t _semaphore; | |
2469 }; | |
2470 | |
2471 | |
2472 Semaphore::Semaphore() { | |
2473 sem_init(&_semaphore, 0, 0); | |
2474 } | |
2475 | |
2476 Semaphore::~Semaphore() { | |
2477 sem_destroy(&_semaphore); | |
2478 } | |
2479 | |
2480 void Semaphore::signal() { | |
2481 sem_post(&_semaphore); | |
2482 } | |
2483 | |
2484 void Semaphore::wait() { | |
2485 sem_wait(&_semaphore); | |
2486 } | |
2487 | |
2488 bool Semaphore::trywait() { | |
2489 return sem_trywait(&_semaphore) == 0; | |
2490 } | |
2491 | |
2492 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
2493 struct timespec ts; | |
2494 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
2495 | |
2496 while (1) { | |
2497 int result = sem_timedwait(&_semaphore, &ts); | |
2498 if (result == 0) { | |
2499 return true; | |
2500 } else if (errno == EINTR) { | |
2501 continue; | |
2502 } else if (errno == ETIMEDOUT) { | |
2503 return false; | |
2504 } else { | |
2505 return false; | |
2506 } | |
2507 } | |
2508 } | |
2509 | |
0 | 2510 extern "C" { |
2511 typedef void (*sa_handler_t)(int); | |
2512 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2513 } | |
2514 | |
2515 void* os::signal(int signal_number, void* handler) { | |
2516 struct sigaction sigAct, oldSigAct; | |
2517 | |
2518 sigfillset(&(sigAct.sa_mask)); | |
2519 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2520 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2521 | |
2522 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2523 // -1 means registration failed | |
2524 return (void *)-1; | |
2525 } | |
2526 | |
2527 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2528 } | |
2529 | |
2530 void os::signal_raise(int signal_number) { | |
2531 ::raise(signal_number); | |
2532 } | |
2533 | |
2534 /* | |
2535 * The following code is moved from os.cpp for making this | |
2536 * code platform specific, which it is by its very nature. | |
2537 */ | |
2538 | |
2539 // Will be modified when max signal is changed to be dynamic | |
2540 int os::sigexitnum_pd() { | |
2541 return NSIG; | |
2542 } | |
2543 | |
2544 // a counter for each possible signal value | |
2545 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2546 | |
2547 // Linux(POSIX) specific hand shaking semaphore. | |
2548 static sem_t sig_sem; | |
10405 | 2549 static Semaphore sr_semaphore; |
0 | 2550 |
2551 void os::signal_init_pd() { | |
2552 // Initialize signal structures | |
2553 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2554 | |
2555 // Initialize signal semaphore | |
2556 ::sem_init(&sig_sem, 0, 0); | |
2557 } | |
2558 | |
2559 void os::signal_notify(int sig) { | |
2560 Atomic::inc(&pending_signals[sig]); | |
2561 ::sem_post(&sig_sem); | |
2562 } | |
2563 | |
2564 static int check_pending_signals(bool wait) { | |
2565 Atomic::store(0, &sigint_count); | |
2566 for (;;) { | |
2567 for (int i = 0; i < NSIG + 1; i++) { | |
2568 jint n = pending_signals[i]; | |
2569 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2570 return i; | |
2571 } | |
2572 } | |
2573 if (!wait) { | |
2574 return -1; | |
2575 } | |
2576 JavaThread *thread = JavaThread::current(); | |
2577 ThreadBlockInVM tbivm(thread); | |
2578 | |
2579 bool threadIsSuspended; | |
2580 do { | |
2581 thread->set_suspend_equivalent(); | |
2582 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2583 ::sem_wait(&sig_sem); | |
2584 | |
2585 // were we externally suspended while we were waiting? | |
2586 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2587 if (threadIsSuspended) { | |
2588 // | |
2589 // The semaphore has been incremented, but while we were waiting | |
2590 // another thread suspended us. We don't want to continue running | |
2591 // while suspended because that would surprise the thread that | |
2592 // suspended us. | |
2593 // | |
2594 ::sem_post(&sig_sem); | |
2595 | |
2596 thread->java_suspend_self(); | |
2597 } | |
2598 } while (threadIsSuspended); | |
2599 } | |
2600 } | |
2601 | |
2602 int os::signal_lookup() { | |
2603 return check_pending_signals(false); | |
2604 } | |
2605 | |
2606 int os::signal_wait() { | |
2607 return check_pending_signals(true); | |
2608 } | |
2609 | |
2610 //////////////////////////////////////////////////////////////////////////////// | |
2611 // Virtual Memory | |
2612 | |
2613 int os::vm_page_size() { | |
2614 // Seems redundant as all get out | |
2615 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2616 return os::Linux::page_size(); | |
2617 } | |
2618 | |
2619 // Solaris allocates memory by pages. | |
2620 int os::vm_allocation_granularity() { | |
2621 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2622 return os::Linux::page_size(); | |
2623 } | |
2624 | |
2625 // Rationale behind this function: | |
2626 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2627 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2628 // samples for JITted code. Here we create private executable mapping over the code cache | |
2629 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2630 // info for the reporting script by storing timestamp and location of symbol | |
2631 void linux_wrap_code(char* base, size_t size) { | |
2632 static volatile jint cnt = 0; | |
2633 | |
2634 if (!UseOprofile) { | |
2635 return; | |
2636 } | |
2637 | |
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
coleenp
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1353
diff
changeset
|
2638 char buf[PATH_MAX+1]; |
0 | 2639 int num = Atomic::add(1, &cnt); |
2640 | |
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2641 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
|
2642 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2643 unlink(buf); |
2644 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2645 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2646 |
2647 if (fd != -1) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2648 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2649 if (rv != (off_t)-1) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2650 if (::write(fd, "", 1) == 1) { |
0 | 2651 mmap(base, size, |
2652 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2653 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2654 } | |
2655 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2656 ::close(fd); |
0 | 2657 unlink(buf); |
2658 } | |
2659 } | |
2660 | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2661 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
|
2662 // 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
|
2663 // 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
|
2664 // 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
|
2665 // 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
|
2666 // 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:
10405
diff
changeset
|
2667 switch (err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2668 case EBADF: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2669 case EINVAL: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2670 case ENOTSUP: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2671 // let the caller deal with these errors |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2672 return true; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2673 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2674 default: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2675 // 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
|
2676 // 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
|
2677 // structures think they have the same memory mapped. The worst |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2678 // scenario is if both the VM and a library think they have the |
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|
2679 // same memory mapped. |
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|
2680 return false; |
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|
2681 } |
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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 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2684 static void warn_fail_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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|
2685 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2686 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2687 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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|
2688 strerror(err), err); |
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|
2689 } |
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|
2690 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2691 static void warn_fail_commit_memory(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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|
2692 size_t alignment_hint, bool exec, |
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|
2693 int err) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2694 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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|
2695 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2696 alignment_hint, exec, strerror(err), err); |
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|
2697 } |
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|
2698 |
0 | 2699 // NOTE: Linux kernel does not really reserve the pages for us. |
2700 // All it does is to check if there are enough free pages | |
2701 // left at the time of mmap(). This could be a potential | |
2702 // problem. | |
10969
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|
2703 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
656 | 2704 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2705 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2706 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2707 if (res != (uintptr_t) MAP_FAILED) { |
2708 if (UseNUMAInterleaving) { | |
2709 numa_make_global(addr, size); | |
2710 } | |
10969
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|
2711 return 0; |
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|
2712 } |
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|
2713 |
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|
2714 int err = errno; // save errno from mmap() call above |
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|
2715 |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2716 if (!recoverable_mmap_error(err)) { |
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|
2717 warn_fail_commit_memory(addr, size, exec, err); |
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|
2718 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2719 } |
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|
2720 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2721 return err; |
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|
2722 } |
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|
2723 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2724 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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|
2725 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
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|
2726 } |
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|
2727 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2728 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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|
2729 const char* mesg) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2730 assert(mesg != NULL, "mesg must be specified"); |
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|
2731 int err = os::Linux::commit_memory_impl(addr, size, exec); |
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|
2732 if (err != 0) { |
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|
2733 // the caller wants all commit errors to exit with the specified mesg: |
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|
2734 warn_fail_commit_memory(addr, size, exec, err); |
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|
2735 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2736 } |
0 | 2737 } |
2738 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
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|
2739 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2740 #ifndef MAP_HUGETLB |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2741 #define MAP_HUGETLB 0x40000 |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2742 #endif |
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changeset
|
2743 |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2744 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
139667d9836a
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|
2745 #ifndef MADV_HUGEPAGE |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2746 #define MADV_HUGEPAGE 14 |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2747 #endif |
139667d9836a
7034464: Support transparent large pages on Linux
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changeset
|
2748 |
10969
a837fa3d3f86
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changeset
|
2749 int os::Linux::commit_memory_impl(char* addr, size_t size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2750 size_t alignment_hint, bool exec) { |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
2751 int err = os::Linux::commit_memory_impl(addr, size, exec); |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2752 if (err == 0) { |
3913
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
parents:
3887
diff
changeset
|
2753 realign_memory(addr, size, alignment_hint); |
10969
a837fa3d3f86
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diff
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|
2754 } |
a837fa3d3f86
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|
2755 return err; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2756 } |
a837fa3d3f86
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|
2757 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2758 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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changeset
|
2759 bool exec) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2760 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
a837fa3d3f86
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|
2761 } |
a837fa3d3f86
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|
2762 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2763 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
a837fa3d3f86
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changeset
|
2764 size_t alignment_hint, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2765 const char* mesg) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2766 assert(mesg != NULL, "mesg must be specified"); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2767 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2768 if (err != 0) { |
a837fa3d3f86
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changeset
|
2769 // the caller wants all commit errors to exit with the specified mesg: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2770 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2771 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
a837fa3d3f86
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diff
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|
2772 } |
0 | 2773 } |
2774 | |
6197 | 2775 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
12110
4c84d351cca9
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|
2776 if (UseTransparentHugePages && alignment_hint > (size_t)vm_page_size()) { |
3286
139667d9836a
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|
2777 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
139667d9836a
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2302
diff
changeset
|
2778 // be supported or the memory may already be backed by huge pages. |
139667d9836a
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diff
changeset
|
2779 ::madvise(addr, bytes, MADV_HUGEPAGE); |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2780 } |
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diff
changeset
|
2781 } |
141 | 2782 |
6197 | 2783 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
iveresov
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5909
diff
changeset
|
2784 // 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
iveresov
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5909
diff
changeset
|
2785 // 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
iveresov
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5909
diff
changeset
|
2786 // 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
iveresov
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5909
diff
changeset
|
2787 // 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
iveresov
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5909
diff
changeset
|
2788 // allow that in any case. |
12110
4c84d351cca9
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stefank
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diff
changeset
|
2789 if (alignment_hint <= (size_t)os::vm_page_size() || can_commit_large_page_memory()) { |
10969
a837fa3d3f86
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diff
changeset
|
2790 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
5937
cf956638b844
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5909
diff
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|
2791 } |
141 | 2792 } |
2793 | |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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356
diff
changeset
|
2794 void os::numa_make_global(char *addr, size_t bytes) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
2795 Linux::numa_interleave_memory(addr, bytes); |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
2796 } |
141 | 2797 |
12176
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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11092
diff
changeset
|
2798 // Define for numa_set_bind_policy(int). Setting the argument to 0 will set the |
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2799 // bind policy to MPOL_PREFERRED for the current thread. |
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2800 #define USE_MPOL_PREFERRED 0 |
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2801 |
141 | 2802 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
12176
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2803 // To make NUMA and large pages more robust when both enabled, we need to ease |
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2804 // the requirements on where the memory should be allocated. MPOL_BIND is the |
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2805 // default policy and it will force memory to be allocated on the specified |
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2806 // node. Changing this to MPOL_PREFERRED will prefer to allocate the memory on |
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2807 // the specified node, but will not force it. Using this policy will prevent |
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2808 // getting SIGBUS when trying to allocate large pages on NUMA nodes with no |
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|
2809 // free large pages. |
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2810 Linux::numa_set_bind_policy(USE_MPOL_PREFERRED); |
141 | 2811 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); |
2812 } | |
2813 | |
2814 bool os::numa_topology_changed() { return false; } | |
2815 | |
2816 size_t os::numa_get_groups_num() { | |
2817 int max_node = Linux::numa_max_node(); | |
2818 return max_node > 0 ? max_node + 1 : 1; | |
2819 } | |
2820 | |
2821 int os::numa_get_group_id() { | |
2822 int cpu_id = Linux::sched_getcpu(); | |
2823 if (cpu_id != -1) { | |
2824 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2825 if (lgrp_id != -1) { | |
2826 return lgrp_id; | |
2827 } | |
0 | 2828 } |
2829 return 0; | |
2830 } | |
2831 | |
141 | 2832 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2833 for (size_t i = 0; i < size; i++) { | |
2834 ids[i] = i; | |
2835 } | |
2836 return size; | |
2837 } | |
2838 | |
0 | 2839 bool os::get_page_info(char *start, page_info* info) { |
2840 return false; | |
2841 } | |
2842 | |
2843 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2844 return end; | |
2845 } | |
2846 | |
3826 | 2847 |
2848 int os::Linux::sched_getcpu_syscall(void) { | |
2849 unsigned int cpu; | |
2850 int retval = -1; | |
2851 | |
2852 #if defined(IA32) | |
3887
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2853 # ifndef SYS_getcpu |
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2854 # define SYS_getcpu 318 |
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2855 # endif |
3826 | 2856 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2857 #elif defined(AMD64) | |
3887
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2858 // Unfortunately we have to bring all these macros here from vsyscall.h |
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2859 // to be able to compile on old linuxes. |
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2860 # define __NR_vgetcpu 2 |
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2861 # define VSYSCALL_START (-10UL << 20) |
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2862 # define VSYSCALL_SIZE 1024 |
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2863 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2864 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2865 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2866 retval = vgetcpu(&cpu, NULL, NULL); | |
2867 #endif | |
2868 | |
2869 return (retval == -1) ? retval : cpu; | |
2870 } | |
2871 | |
2191 | 2872 // Something to do with the numa-aware allocator needs these symbols |
2873 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2874 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2875 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2876 |
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2877 |
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2878 // If we are running with libnuma version > 2, then we should |
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2879 // be trying to use symbols with versions 1.1 |
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2880 // If we are running with earlier version, which did not have symbol versions, |
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2881 // we should use the base version. |
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2882 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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2883 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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2884 if (f == NULL) { |
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2885 f = dlsym(handle, name); |
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2886 } |
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2887 return f; |
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|
2888 } |
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2889 |
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2890 bool os::Linux::libnuma_init() { |
141 | 2891 // sched_getcpu() should be in libc. |
2892 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2893 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2894 | |
3826 | 2895 // If it's not, try a direct syscall. |
2896 if (sched_getcpu() == -1) | |
2897 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2898 | |
141 | 2899 if (sched_getcpu() != -1) { // Does it work? |
267
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2900 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2901 if (handle != NULL) { |
2902 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
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2903 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2904 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
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2905 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2906 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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2907 libnuma_dlsym(handle, "numa_available"))); |
141 | 2908 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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2909 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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2910 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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2911 libnuma_dlsym(handle, "numa_interleave_memory"))); |
12176
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2912 set_numa_set_bind_policy(CAST_TO_FN_PTR(numa_set_bind_policy_func_t, |
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|
2913 libnuma_dlsym(handle, "numa_set_bind_policy"))); |
462
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2914 |
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2915 |
141 | 2916 if (numa_available() != -1) { |
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2917 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2918 // Create a cpu -> node mapping |
6197 | 2919 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2920 rebuild_cpu_to_node_map(); |
462
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2921 return true; |
141 | 2922 } |
2923 } | |
2924 } | |
462
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2925 return false; |
141 | 2926 } |
2927 | |
2928 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2929 // The table is later used in get_node_by_cpu(). | |
2930 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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2931 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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2932 // in libnuma (possible values are starting from 16, |
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2933 // and continuing up with every other power of 2, but less |
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2934 // than the maximum number of CPUs supported by kernel), and |
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2935 // is a subject to change (in libnuma version 2 the requirements |
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2936 // are more reasonable) we'll just hardcode the number they use |
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2937 // in the library. |
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2938 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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2939 |
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2940 size_t cpu_num = os::active_processor_count(); |
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2941 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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2942 size_t cpu_map_valid_size = |
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2943 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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2944 |
141 | 2945 cpu_to_node()->clear(); |
2946 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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2947 size_t node_num = numa_get_groups_num(); |
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2948 |
6197 | 2949 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
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|
2950 for (size_t i = 0; i < node_num; i++) { |
141 | 2951 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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|
2952 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2953 if (cpu_map[j] != 0) { |
462
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|
2954 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2955 if (cpu_map[j] & (1UL << k)) { |
462
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|
2956 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2957 } |
2958 } | |
2959 } | |
2960 } | |
2961 } | |
2962 } | |
6197 | 2963 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2964 } |
2965 | |
2966 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2967 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2968 return cpu_to_node()->at(cpu_id); | |
2969 } | |
2970 return -1; | |
2971 } | |
2972 | |
2973 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2974 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2975 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2976 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2977 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2978 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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2979 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
12176
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2980 os::Linux::numa_set_bind_policy_func_t os::Linux::_numa_set_bind_policy; |
462
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2981 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2982 |
6197 | 2983 bool os::pd_uncommit_memory(char* addr, size_t size) { |
1681
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|
2984 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
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|
2985 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
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|
2986 return res != (uintptr_t) MAP_FAILED; |
0 | 2987 } |
2988 | |
12144
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|
2989 static |
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|
2990 address get_stack_commited_bottom(address bottom, size_t size) { |
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|
2991 address nbot = bottom; |
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|
2992 address ntop = bottom + size; |
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|
2993 |
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2994 size_t page_sz = os::vm_page_size(); |
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|
2995 unsigned pages = size / page_sz; |
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|
2996 |
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|
2997 unsigned char vec[1]; |
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|
2998 unsigned imin = 1, imax = pages + 1, imid; |
14909 | 2999 int mincore_return_value; |
12144
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|
3000 |
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|
3001 while (imin < imax) { |
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|
3002 imid = (imax + imin) / 2; |
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|
3003 nbot = ntop - (imid * page_sz); |
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|
3004 |
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|
3005 // Use a trick with mincore to check whether the page is mapped or not. |
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|
3006 // mincore sets vec to 1 if page resides in memory and to 0 if page |
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3007 // is swapped output but if page we are asking for is unmapped |
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3008 // it returns -1,ENOMEM |
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3009 mincore_return_value = mincore(nbot, page_sz, vec); |
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|
3010 |
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|
3011 if (mincore_return_value == -1) { |
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3012 // Page is not mapped go up |
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|
3013 // to find first mapped page |
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|
3014 if (errno != EAGAIN) { |
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|
3015 assert(errno == ENOMEM, "Unexpected mincore errno"); |
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|
3016 imax = imid; |
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|
3017 } |
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|
3018 } else { |
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|
3019 // Page is mapped go down |
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|
3020 // to find first not mapped page |
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3021 imin = imid + 1; |
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|
3022 } |
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|
3023 } |
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|
3024 |
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3025 nbot = nbot + page_sz; |
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|
3026 |
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3027 // Adjust stack bottom one page up if last checked page is not mapped |
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|
3028 if (mincore_return_value == -1) { |
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3029 nbot = nbot + page_sz; |
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|
3030 } |
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|
3031 |
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|
3032 return nbot; |
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|
3033 } |
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|
3034 |
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|
3035 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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3036 // Linux uses a growable mapping for the stack, and if the mapping for |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3037 // 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
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3038 // stack cannot grow beyond the pages where the stack guard was |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
3039 // mapped. If at some point later in the process the stack expands to |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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3040 // that point, the Linux kernel cannot expand the stack any further |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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3041 // because the guard pages are in the way, and a segfault occurs. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3042 // |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3043 // 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
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3044 // a region (leaving a hole) that's already part of the stack mapping, |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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|
3045 // 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
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|
3046 // 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
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|
3047 // 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
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|
3048 // create_stack_guard_pages() is called. |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
3049 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3050 // 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
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|
3051 // 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
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|
3052 // 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
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|
3053 // 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
|
3054 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
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diff
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|
3055 // 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
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|
3056 // 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
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|
3057 // 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
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1123
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|
3058 // munmap() the guard pages we don't leave a hole in the stack |
12144
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|
3059 // mapping. This only affects the main/initial thread |
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|
3060 |
6197 | 3061 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
12144
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|
3062 |
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|
3063 if (os::Linux::is_initial_thread()) { |
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|
3064 // As we manually grow stack up to bottom inside create_attached_thread(), |
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|
3065 // it's likely that os::Linux::initial_thread_stack_bottom is mapped and |
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|
3066 // we don't need to do anything special. |
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|
3067 // Check it first, before calling heavy function. |
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|
3068 uintptr_t stack_extent = (uintptr_t) os::Linux::initial_thread_stack_bottom(); |
d8e99408faad
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|
3069 unsigned char vec[1]; |
d8e99408faad
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|
3070 |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
3071 if (mincore((address)stack_extent, os::vm_page_size(), vec) == -1) { |
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|
3072 // Fallback to slow path on all errors, including EAGAIN |
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|
3073 stack_extent = (uintptr_t) get_stack_commited_bottom( |
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|
3074 os::Linux::initial_thread_stack_bottom(), |
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|
3075 (size_t)addr - stack_extent); |
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|
3076 } |
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|
3077 |
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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|
3078 if (stack_extent < (uintptr_t)addr) { |
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|
3079 ::munmap((void*)stack_extent, (uintptr_t)(addr - stack_extent)); |
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|
3080 } |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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diff
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|
3081 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
3082 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3083 return os::commit_memory(addr, size, !ExecMem); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
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|
3084 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3085 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
changeset
|
3086 // 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
|
3087 // 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
|
3088 // affects the main/initial thread, but guard against future OS changes |
12144
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|
3089 // It's safe to always unmap guard pages for initial thread because we |
d8e99408faad
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|
3090 // always place it right after end of the mapped region |
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|
3091 |
1320
3b3d12e645e7
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|
3092 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3093 uintptr_t stack_extent, stack_base; |
12144
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|
3094 |
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|
3095 if (os::Linux::is_initial_thread()) { |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3096 return ::munmap(addr, size) == 0; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
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diff
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|
3097 } |
3b3d12e645e7
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1123
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|
3098 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3099 return os::uncommit_memory(addr, size); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
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|
3100 } |
3b3d12e645e7
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|
3101 |
0 | 3102 static address _highest_vm_reserved_address = NULL; |
3103 | |
3104 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
3105 // at 'requested_addr'. If there are existing memory mappings at the same | |
3106 // location, however, they will be overwritten. If 'fixed' is false, | |
3107 // 'requested_addr' is only treated as a hint, the return value may or | |
3108 // may not start from the requested address. Unlike Linux mmap(), this | |
3109 // function returns NULL to indicate failure. | |
3110 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
3111 char * addr; | |
3112 int flags; | |
3113 | |
3114 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
3115 if (fixed) { | |
3116 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
3117 flags |= MAP_FIXED; | |
3118 } | |
3119 | |
10157 | 3120 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
3121 // touch an uncommitted page. Otherwise, the read/write might | |
3122 // succeed if we have enough swap space to back the physical page. | |
3123 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
0 | 3124 flags, -1, 0); |
3125 | |
3126 if (addr != MAP_FAILED) { | |
3127 // anon_mmap() should only get called during VM initialization, | |
3128 // don't need lock (actually we can skip locking even it can be called | |
3129 // from multiple threads, because _highest_vm_reserved_address is just a | |
3130 // hint about the upper limit of non-stack memory regions.) | |
3131 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
3132 _highest_vm_reserved_address = (address)addr + bytes; | |
3133 } | |
3134 } | |
3135 | |
3136 return addr == MAP_FAILED ? NULL : addr; | |
3137 } | |
3138 | |
3139 // Don't update _highest_vm_reserved_address, because there might be memory | |
3140 // regions above addr + size. If so, releasing a memory region only creates | |
3141 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
3142 // | |
3143 static int anon_munmap(char * addr, size_t size) { | |
3144 return ::munmap(addr, size) == 0; | |
3145 } | |
3146 | |
6197 | 3147 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 3148 size_t alignment_hint) { |
3149 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
3150 } | |
3151 | |
6197 | 3152 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 3153 return anon_munmap(addr, size); |
3154 } | |
3155 | |
3156 static address highest_vm_reserved_address() { | |
3157 return _highest_vm_reserved_address; | |
3158 } | |
3159 | |
3160 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
3161 // Linux wants the mprotect address argument to be page aligned. | |
3162 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
3163 | |
3164 // According to SUSv3, mprotect() should only be used with mappings | |
3165 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
3166 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
3167 // protection of malloc'ed or statically allocated memory). Check the | |
3168 // caller if you hit this assert. | |
3169 assert(addr == bottom, "sanity check"); | |
3170 | |
3171 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
3172 return ::mprotect(bottom, size, prot) == 0; | |
3173 } | |
3174 | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3175 // Set protections specified |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3176 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
|
3177 bool is_committed) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3178 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3179 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3180 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3181 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3182 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3183 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
|
3184 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3185 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3186 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3187 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3188 return linux_mprotect(addr, bytes, p); |
0 | 3189 } |
3190 | |
3191 bool os::guard_memory(char* addr, size_t size) { | |
3192 return linux_mprotect(addr, size, PROT_NONE); | |
3193 } | |
3194 | |
3195 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
|
3196 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 3197 } |
3198 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3199 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
|
3200 bool result = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3201 void *p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3202 MAP_ANONYMOUS|MAP_PRIVATE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3203 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3204 if (p != MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3205 void *aligned_p = align_ptr_up(p, page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3206 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3207 result = madvise(aligned_p, page_size, MADV_HUGEPAGE) == 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3208 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3209 munmap(p, page_size * 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3210 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3211 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3212 if (warn && !result) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3213 warning("TransparentHugePages is not supported by the operating system."); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3214 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3215 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3216 return result; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3217 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3218 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3219 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
|
3220 bool result = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3221 void *p = mmap(NULL, page_size, PROT_READ|PROT_WRITE, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3222 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3223 -1, 0); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3224 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3225 if (p != MAP_FAILED) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3226 // 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
|
3227 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3228 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3229 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3230 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3231 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3232 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3233 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3234 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3235 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3236 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3237 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3238 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3239 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3240 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3241 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3242 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3243 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3244 munmap(p, page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3245 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3246 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3247 if (warn && !result) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3248 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3249 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3250 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3251 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3252 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3253 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3254 /* |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3255 * 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
|
3256 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3257 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3258 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3259 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3260 * - (bit 1) anonymous shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3261 * - (bit 2) file-backed private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3262 * - (bit 3) file-backed shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3263 * - (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
|
3264 * effective only if the bit 2 is cleared) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3265 * - (bit 5) hugetlb private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3266 * - (bit 6) hugetlb shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3267 */ |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3268 static void set_coredump_filter(void) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3269 FILE *f; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3270 long cdm; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3271 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3272 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3273 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3274 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3275 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3276 if (fscanf(f, "%lx", &cdm) != 1) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3277 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3278 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3279 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3280 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3281 rewind(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3282 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3283 if ((cdm & LARGEPAGES_BIT) == 0) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3284 cdm |= LARGEPAGES_BIT; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3285 fprintf(f, "%#lx", cdm); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3286 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3287 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3288 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3289 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3290 |
0 | 3291 // Large page support |
3292 | |
3293 static size_t _large_page_size = 0; | |
3294 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3295 size_t os::Linux::find_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3296 size_t large_page_size = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3297 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3298 // 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
|
3299 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3300 // 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
|
3301 // page as large as 256M. |
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 // 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
|
3304 // for a line with the following format: |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3305 // Hugepagesize: 2048 kB |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3306 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3307 // 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
|
3308 // 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
|
3309 // the processor. |
0 | 3310 |
1010 | 3311 #ifndef ZERO |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3312 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
|
3313 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3314 #endif // ZERO |
0 | 3315 |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3316 FILE *fp = fopen("/proc/meminfo", "r"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3317 if (fp) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3318 while (!feof(fp)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3319 int x = 0; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3320 char buf[16]; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3321 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3322 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3323 large_page_size = x * K; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3324 break; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3325 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3326 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3327 // skip to next line |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3328 for (;;) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3329 int ch = fgetc(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3330 if (ch == EOF || ch == (int)'\n') break; |
0 | 3331 } |
3332 } | |
3333 } | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3334 fclose(fp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3335 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3336 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3337 if (!FLAG_IS_DEFAULT(LargePageSizeInBytes) && LargePageSizeInBytes != large_page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3338 warning("Setting LargePageSizeInBytes has no effect on this OS. Large page size is " |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3339 SIZE_FORMAT "%s.", byte_size_in_proper_unit(large_page_size), |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3340 proper_unit_for_byte_size(large_page_size)); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3341 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3342 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3343 return large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3344 } |
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3345 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3346 size_t os::Linux::setup_large_page_size() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3347 _large_page_size = Linux::find_large_page_size(); |
0 | 3348 const size_t default_page_size = (size_t)Linux::page_size(); |
3349 if (_large_page_size > default_page_size) { | |
3350 _page_sizes[0] = _large_page_size; | |
3351 _page_sizes[1] = default_page_size; | |
3352 _page_sizes[2] = 0; | |
3353 } | |
12110
4c84d351cca9
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diff
changeset
|
3354 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3355 return _large_page_size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3356 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3357 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3358 bool os::Linux::setup_large_page_type(size_t page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3359 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3360 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3361 FLAG_IS_DEFAULT(UseTransparentHugePages)) { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
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12252
diff
changeset
|
3362 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
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diff
changeset
|
3363 // 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
|
3364 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3365 // Try UseHugeTLBFS and then UseSHM. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3366 UseHugeTLBFS = UseSHM = true; |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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12252
diff
changeset
|
3367 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3368 // Don't try UseTransparentHugePages since there are known |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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parents:
12252
diff
changeset
|
3369 // performance issues with it turned on. This might change in the future. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
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diff
changeset
|
3370 UseTransparentHugePages = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3371 } |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3372 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3373 if (UseTransparentHugePages) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3374 bool warn_on_failure = !FLAG_IS_DEFAULT(UseTransparentHugePages); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3375 if (transparent_huge_pages_sanity_check(warn_on_failure, page_size)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3376 UseHugeTLBFS = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3377 UseSHM = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3378 return true; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3379 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3380 UseTransparentHugePages = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3381 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3382 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3383 if (UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3384 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3385 if (hugetlbfs_sanity_check(warn_on_failure, page_size)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3386 UseSHM = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3387 return true; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3388 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3389 UseHugeTLBFS = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3390 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3391 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3392 return UseSHM; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3393 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3394 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3395 void os::large_page_init() { |
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3396 if (!UseLargePages && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3397 !UseTransparentHugePages && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3398 !UseHugeTLBFS && |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3399 !UseSHM) { |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3400 // Not using large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3401 return; |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3402 } |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3403 |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
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parents:
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diff
changeset
|
3404 if (!FLAG_IS_DEFAULT(UseLargePages) && !UseLargePages) { |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3405 // The user explicitly turned off large pages. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3406 // Ignore the rest of the large pages flags. |
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3407 UseTransparentHugePages = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3408 UseHugeTLBFS = false; |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3409 UseSHM = false; |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3410 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3411 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3412 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3413 size_t large_page_size = Linux::setup_large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3414 UseLargePages = Linux::setup_large_page_type(large_page_size); |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3415 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3416 set_coredump_filter(); |
0 | 3417 } |
3418 | |
3419 #ifndef SHM_HUGETLB | |
3420 #define SHM_HUGETLB 04000 | |
3421 #endif | |
3422 | |
12110
4c84d351cca9
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|
3423 char* os::Linux::reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
656 | 3424 // "exec" is passed in but not used. Creating the shared image for |
3425 // 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
|
3426 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3427 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3428 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3429 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { |
4c84d351cca9
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changeset
|
3430 return NULL; // Fallback to small pages. |
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diff
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|
3431 } |
0 | 3432 |
3433 key_t key = IPC_PRIVATE; | |
3434 char *addr; | |
3435 | |
3436 bool warn_on_failure = UseLargePages && | |
3437 (!FLAG_IS_DEFAULT(UseLargePages) || | |
12110
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|
3438 !FLAG_IS_DEFAULT(UseSHM) || |
0 | 3439 !FLAG_IS_DEFAULT(LargePageSizeInBytes) |
3440 ); | |
3441 char msg[128]; | |
3442 | |
3443 // Create a large shared memory region to attach to based on size. | |
3444 // Currently, size is the total size of the heap | |
3445 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
3446 if (shmid == -1) { | |
3447 // Possible reasons for shmget failure: | |
3448 // 1. shmmax is too small for Java heap. | |
3449 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
3450 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
3451 // 2. not enough large page memory. | |
3452 // > check available large pages: cat /proc/meminfo | |
3453 // > increase amount of large pages: | |
3454 // echo new_value > /proc/sys/vm/nr_hugepages | |
3455 // Note 1: different Linux may use different name for this property, | |
3456 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
3457 // Note 2: it's possible there's enough physical memory available but | |
3458 // they are so fragmented after a long run that they can't | |
3459 // coalesce into large pages. Try to reserve large pages when | |
3460 // the system is still "fresh". | |
3461 if (warn_on_failure) { | |
3462 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
3463 warning(msg); | |
3464 } | |
3465 return NULL; | |
3466 } | |
3467 | |
3468 // attach to the region | |
1537
79bf863697eb
6951686: Using large pages on Linux prevents zero based compressed oops
kvn
parents:
1500
diff
changeset
|
3469 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 3470 int err = errno; |
3471 | |
3472 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3473 // will be deleted when it's detached by shmdt() or when the process | |
3474 // terminates. If shmat() is not successful this will remove the shared | |
3475 // segment immediately. | |
3476 shmctl(shmid, IPC_RMID, NULL); | |
3477 | |
3478 if ((intptr_t)addr == -1) { | |
3479 if (warn_on_failure) { | |
3480 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
3481 warning(msg); | |
3482 } | |
3483 return NULL; | |
3484 } | |
3485 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3486 return addr; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3487 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3488 |
4c84d351cca9
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changeset
|
3489 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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changeset
|
3490 assert(error == ENOMEM, "Only expect to fail if no memory is available"); |
4c84d351cca9
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changeset
|
3491 |
4c84d351cca9
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diff
changeset
|
3492 bool warn_on_failure = UseLargePages && |
4c84d351cca9
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changeset
|
3493 (!FLAG_IS_DEFAULT(UseLargePages) || |
4c84d351cca9
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changeset
|
3494 !FLAG_IS_DEFAULT(UseHugeTLBFS) || |
4c84d351cca9
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changeset
|
3495 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); |
4c84d351cca9
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changeset
|
3496 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3497 if (warn_on_failure) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3498 char msg[128]; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3499 jio_snprintf(msg, sizeof(msg), "Failed to reserve large pages memory req_addr: " |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3500 PTR_FORMAT " bytes: " SIZE_FORMAT " (errno = %d).", req_addr, bytes, error); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3501 warning(msg); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3502 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3503 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3504 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3505 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
|
3506 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3507 assert(is_size_aligned(bytes, os::large_page_size()), "Unaligned size"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3508 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
|
3509 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3510 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3511 char* addr = (char*)::mmap(req_addr, bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3512 MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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11092
diff
changeset
|
3513 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
11092
diff
changeset
|
3514 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3515 if (addr == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3516 warn_on_large_pages_failure(req_addr, bytes, errno); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3517 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3518 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3519 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3520 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
|
3521 |
0 | 3522 return addr; |
3523 } | |
3524 | |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3525 char* os::Linux::reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3526 size_t large_page_size = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3527 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3528 assert(bytes >= large_page_size, "Shouldn't allocate large pages for small sizes"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3529 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3530 // Allocate small pages. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3531 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3532 char* start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3533 if (req_addr != NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
11092
diff
changeset
|
3534 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3535 assert(is_size_aligned(bytes, alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3536 start = os::reserve_memory(bytes, req_addr); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3537 assert(start == NULL || start == req_addr, "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3538 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3539 start = os::reserve_memory_aligned(bytes, alignment); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3540 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3541 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3542 if (start == NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3543 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3544 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3545 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3546 assert(is_ptr_aligned(start, alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3547 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3548 // os::reserve_memory_special will record this memory area. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3549 // Need to release it here to prevent overlapping reservations. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3550 MemTracker::record_virtual_memory_release((address)start, bytes); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3551 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3552 char* end = start + bytes; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3553 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3554 // Find the regions of the allocated chunk that can be promoted to large pages. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3555 char* lp_start = (char*)align_ptr_up(start, large_page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3556 char* lp_end = (char*)align_ptr_down(end, large_page_size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3557 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3558 size_t lp_bytes = lp_end - lp_start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3559 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3560 assert(is_size_aligned(lp_bytes, large_page_size), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3561 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3562 if (lp_bytes == 0) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3563 // The mapped region doesn't even span the start and the end of a large page. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3564 // Fall back to allocate a non-special area. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3565 ::munmap(start, end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3566 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3567 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3568 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3569 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3570 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3571 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3572 void* result; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3573 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3574 if (start != lp_start) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3575 result = ::mmap(start, lp_start - start, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3576 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3577 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3578 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3579 ::munmap(lp_start, end - lp_start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3580 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3581 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3582 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3583 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3584 result = ::mmap(lp_start, lp_bytes, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3585 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED|MAP_HUGETLB, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3586 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3587 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3588 warn_on_large_pages_failure(req_addr, bytes, errno); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3589 // If the mmap above fails, the large pages region will be unmapped and we |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3590 // have regions before and after with small pages. Release these regions. |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3591 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3592 // | mapped | unmapped | mapped | |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3593 // ^ ^ ^ ^ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3594 // start lp_start lp_end end |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3595 // |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3596 ::munmap(start, lp_start - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3597 ::munmap(lp_end, end - lp_end); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3598 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3599 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3600 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3601 if (lp_end != end) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3602 result = ::mmap(lp_end, end - lp_end, prot, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3603 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3604 -1, 0); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3605 if (result == MAP_FAILED) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3606 ::munmap(start, lp_end - start); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3607 return NULL; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3608 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3609 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3610 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3611 return start; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3612 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3613 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3614 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()
stefank
parents:
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diff
changeset
|
3615 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3616 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3617 assert(is_power_of_2(alignment), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3618 assert(is_power_of_2(os::large_page_size()), "Must be"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3619 assert(bytes >= os::large_page_size(), "Shouldn't allocate large pages for small sizes"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3620 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3621 if (is_size_aligned(bytes, os::large_page_size()) && alignment <= os::large_page_size()) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3622 return reserve_memory_special_huge_tlbfs_only(bytes, req_addr, exec); |
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|
3623 } else { |
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3624 return reserve_memory_special_huge_tlbfs_mixed(bytes, alignment, req_addr, exec); |
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|
3625 } |
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|
3626 } |
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|
3627 |
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|
3628 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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3629 assert(UseLargePages, "only for large pages"); |
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|
3630 |
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|
3631 char* addr; |
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|
3632 if (UseSHM) { |
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3633 addr = os::Linux::reserve_memory_special_shm(bytes, alignment, req_addr, exec); |
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3634 } else { |
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|
3635 assert(UseHugeTLBFS, "must be"); |
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3636 addr = os::Linux::reserve_memory_special_huge_tlbfs(bytes, alignment, req_addr, exec); |
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|
3637 } |
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|
3638 |
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|
3639 if (addr != NULL) { |
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|
3640 if (UseNUMAInterleaving) { |
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|
3641 numa_make_global(addr, bytes); |
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3642 } |
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|
3643 |
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|
3644 // The memory is committed |
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|
3645 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
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|
3646 } |
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|
3647 |
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|
3648 return addr; |
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|
3649 } |
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|
3650 |
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|
3651 bool os::Linux::release_memory_special_shm(char* base, size_t bytes) { |
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3652 // detaching the SHM segment will also delete it, see reserve_memory_special_shm() |
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3653 return shmdt(base) == 0; |
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|
3654 } |
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|
3655 |
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|
3656 bool os::Linux::release_memory_special_huge_tlbfs(char* base, size_t bytes) { |
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3657 return pd_release_memory(base, bytes); |
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|
3658 } |
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|
3659 |
0 | 3660 bool os::release_memory_special(char* base, size_t bytes) { |
12110
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|
3661 assert(UseLargePages, "only for large pages"); |
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|
3662 |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
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|
3663 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
12110
4c84d351cca9
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|
3664 |
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|
3665 bool res; |
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|
3666 if (UseSHM) { |
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|
3667 res = os::Linux::release_memory_special_shm(base, bytes); |
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|
3668 } else { |
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|
3669 assert(UseHugeTLBFS, "must be"); |
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3670 res = os::Linux::release_memory_special_huge_tlbfs(base, bytes); |
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|
3671 } |
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|
3672 |
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|
3673 if (res) { |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
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|
3674 tkr.record((address)base, bytes); |
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
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|
3675 } else { |
10986
1f4355cee9a2
8013651: NMT: reserve/release sequence id's in incorrect order due to race
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|
3676 tkr.discard(); |
12110
4c84d351cca9
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|
3677 } |
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|
3678 |
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|
3679 return res; |
0 | 3680 } |
3681 | |
3682 size_t os::large_page_size() { | |
3683 return _large_page_size; | |
3684 } | |
3685 | |
12110
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|
3686 // With SysV SHM the entire memory region must be allocated as shared |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
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|
3687 // memory. |
12110
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|
3688 // HugeTLBFS allows application to commit large page memory on demand. |
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|
3689 // However, when committing memory with HugeTLBFS fails, the region |
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|
3690 // that was supposed to be committed will lose the old reservation |
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|
3691 // and allow other threads to steal that memory region. Because of this |
4c84d351cca9
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|
3692 // behavior we can't commit HugeTLBFS memory. |
0 | 3693 bool os::can_commit_large_page_memory() { |
12110
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|
3694 return UseTransparentHugePages; |
0 | 3695 } |
3696 | |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
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62
diff
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|
3697 bool os::can_execute_large_page_memory() { |
12110
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|
3698 return UseTransparentHugePages || UseHugeTLBFS; |
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
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|
3699 } |
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
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|
3700 |
0 | 3701 // Reserve memory at an arbitrary address, only if that area is |
3702 // available (and not reserved for something else). | |
3703 | |
6197 | 3704 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3705 const int max_tries = 10; |
3706 char* base[max_tries]; | |
3707 size_t size[max_tries]; | |
3708 const size_t gap = 0x000000; | |
3709 | |
3710 // Assert only that the size is a multiple of the page size, since | |
3711 // that's all that mmap requires, and since that's all we really know | |
3712 // about at this low abstraction level. If we need higher alignment, | |
3713 // we can either pass an alignment to this method or verify alignment | |
3714 // in one of the methods further up the call chain. See bug 5044738. | |
3715 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3716 | |
3717 // Repeatedly allocate blocks until the block is allocated at the | |
3718 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3719 // automatically update _highest_vm_reserved_address if the call is | |
3720 // successful. The variable tracks the highest memory address every reserved | |
3721 // by JVM. It is used to detect heap-stack collision if running with | |
3722 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3723 // space than needed, it could confuse the collision detecting code. To | |
3724 // solve the problem, save current _highest_vm_reserved_address and | |
3725 // calculate the correct value before return. | |
3726 address old_highest = _highest_vm_reserved_address; | |
3727 | |
3728 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3729 // if kernel honors the hint then we can return immediately. | |
3730 char * addr = anon_mmap(requested_addr, bytes, false); | |
3731 if (addr == requested_addr) { | |
3732 return requested_addr; | |
3733 } | |
3734 | |
3735 if (addr != NULL) { | |
3736 // mmap() is successful but it fails to reserve at the requested address | |
3737 anon_munmap(addr, bytes); | |
3738 } | |
3739 | |
3740 int i; | |
3741 for (i = 0; i < max_tries; ++i) { | |
3742 base[i] = reserve_memory(bytes); | |
3743 | |
3744 if (base[i] != NULL) { | |
3745 // Is this the block we wanted? | |
3746 if (base[i] == requested_addr) { | |
3747 size[i] = bytes; | |
3748 break; | |
3749 } | |
3750 | |
3751 // Does this overlap the block we wanted? Give back the overlapped | |
3752 // parts and try again. | |
3753 | |
3754 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3755 if (top_overlap >= 0 && top_overlap < bytes) { | |
3756 unmap_memory(base[i], top_overlap); | |
3757 base[i] += top_overlap; | |
3758 size[i] = bytes - top_overlap; | |
3759 } else { | |
3760 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3761 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3762 unmap_memory(requested_addr, bottom_overlap); | |
3763 size[i] = bytes - bottom_overlap; | |
3764 } else { | |
3765 size[i] = bytes; | |
3766 } | |
3767 } | |
3768 } | |
3769 } | |
3770 | |
3771 // Give back the unused reserved pieces. | |
3772 | |
3773 for (int j = 0; j < i; ++j) { | |
3774 if (base[j] != NULL) { | |
3775 unmap_memory(base[j], size[j]); | |
3776 } | |
3777 } | |
3778 | |
3779 if (i < max_tries) { | |
3780 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3781 return requested_addr; | |
3782 } else { | |
3783 _highest_vm_reserved_address = old_highest; | |
3784 return NULL; | |
3785 } | |
3786 } | |
3787 | |
3788 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3789 return ::read(fd, buf, nBytes); | |
3790 } | |
3791 | |
14909 | 3792 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. |
3793 // Solaris uses poll(), linux uses park(). | |
3794 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3795 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3796 // SIGSEGV, see 4355769. | |
3797 | |
3798 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3799 assert(thread == Thread::current(), "thread consistency check"); | |
3800 | |
3801 ParkEvent * const slp = thread->_SleepEvent ; | |
3802 slp->reset() ; | |
3803 OrderAccess::fence() ; | |
3804 | |
3805 if (interruptible) { | |
3806 jlong prevtime = javaTimeNanos(); | |
3807 | |
3808 for (;;) { | |
3809 if (os::is_interrupted(thread, true)) { | |
3810 return OS_INTRPT; | |
3811 } | |
3812 | |
3813 jlong newtime = javaTimeNanos(); | |
3814 | |
3815 if (newtime - prevtime < 0) { | |
3816 // time moving backwards, should only happen if no monotonic clock | |
3817 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3818 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3819 } else { | |
3820 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; | |
3821 } | |
3822 | |
3823 if(millis <= 0) { | |
3824 return OS_OK; | |
3825 } | |
3826 | |
3827 prevtime = newtime; | |
3828 | |
3829 { | |
3830 assert(thread->is_Java_thread(), "sanity check"); | |
3831 JavaThread *jt = (JavaThread *) thread; | |
3832 ThreadBlockInVM tbivm(jt); | |
3833 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3834 | |
3835 jt->set_suspend_equivalent(); | |
3836 // cleared by handle_special_suspend_equivalent_condition() or | |
3837 // java_suspend_self() via check_and_wait_while_suspended() | |
3838 | |
3839 slp->park(millis); | |
3840 | |
3841 // were we externally suspended while we were waiting? | |
3842 jt->check_and_wait_while_suspended(); | |
3843 } | |
3844 } | |
3845 } else { | |
3846 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3847 jlong prevtime = javaTimeNanos(); | |
3848 | |
3849 for (;;) { | |
3850 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3851 // the 1st iteration ... | |
3852 jlong newtime = javaTimeNanos(); | |
3853 | |
3854 if (newtime - prevtime < 0) { | |
3855 // time moving backwards, should only happen if no monotonic clock | |
3856 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3857 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3858 } else { | |
3859 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; | |
3860 } | |
3861 | |
3862 if(millis <= 0) break ; | |
3863 | |
3864 prevtime = newtime; | |
3865 slp->park(millis); | |
3866 } | |
3867 return OS_OK ; | |
3868 } | |
3869 } | |
3870 | |
3871 int os::naked_sleep() { | |
3872 // %% make the sleep time an integer flag. for now use 1 millisec. | |
3873 return os::sleep(Thread::current(), 1, false); | |
0 | 3874 } |
3875 | |
3876 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3877 void os::infinite_sleep() { | |
3878 while (true) { // sleep forever ... | |
3879 ::sleep(100); // ... 100 seconds at a time | |
3880 } | |
3881 } | |
3882 | |
3883 // Used to convert frequent JVM_Yield() to nops | |
3884 bool os::dont_yield() { | |
3885 return DontYieldALot; | |
3886 } | |
3887 | |
3888 void os::yield() { | |
3889 sched_yield(); | |
3890 } | |
3891 | |
3892 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3893 | |
3894 void os::yield_all(int attempts) { | |
3895 // Yields to all threads, including threads with lower priorities | |
3896 // Threads on Linux are all with same priority. The Solaris style | |
3897 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3898 sched_yield(); | |
3899 } | |
3900 | |
3901 // Called from the tight loops to possibly influence time-sharing heuristics | |
3902 void os::loop_breaker(int attempts) { | |
3903 os::yield_all(attempts); | |
3904 } | |
3905 | |
3906 //////////////////////////////////////////////////////////////////////////////// | |
3907 // thread priority support | |
3908 | |
3909 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3910 // only supports dynamic priority, static priority must be zero. For real-time | |
3911 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3912 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3913 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3914 // of 5 runs - Sep 2005). | |
3915 // | |
3916 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3917 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3918 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3919 // threads. It has always been the case, but could change in the future. For | |
3920 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3921 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3922 | |
4854
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
phh
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4803
diff
changeset
|
3923 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3924 19, // 0 Entry should never be used |
3925 | |
3926 4, // 1 MinPriority | |
3927 3, // 2 | |
3928 2, // 3 | |
3929 | |
3930 1, // 4 | |
3931 0, // 5 NormPriority | |
3932 -1, // 6 | |
3933 | |
3934 -2, // 7 | |
3935 -3, // 8 | |
3936 -4, // 9 NearMaxPriority | |
3937 | |
4854
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
phh
parents:
4803
diff
changeset
|
3938 -5, // 10 MaxPriority |
de268c8a8075
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3939 |
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3940 -5 // 11 CriticalPriority |
0 | 3941 }; |
3942 | |
3943 static int prio_init() { | |
3944 if (ThreadPriorityPolicy == 1) { | |
3945 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3946 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3947 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3948 if (geteuid() != 0) { | |
3949 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3950 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3951 } | |
3952 ThreadPriorityPolicy = 0; | |
3953 } | |
3954 } | |
4854
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|
3955 if (UseCriticalJavaThreadPriority) { |
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|
3956 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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|
3957 } |
0 | 3958 return 0; |
3959 } | |
3960 | |
3961 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3962 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3963 | |
3964 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3965 return (ret == 0) ? OS_OK : OS_ERR; | |
3966 } | |
3967 | |
3968 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3969 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3970 *priority_ptr = java_to_os_priority[NormPriority]; | |
3971 return OS_OK; | |
3972 } | |
3973 | |
3974 errno = 0; | |
3975 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3976 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3977 } | |
3978 | |
3979 // Hint to the underlying OS that a task switch would not be good. | |
3980 // Void return because it's a hint and can fail. | |
3981 void os::hint_no_preempt() {} | |
3982 | |
3983 //////////////////////////////////////////////////////////////////////////////// | |
3984 // suspend/resume support | |
3985 | |
3986 // the low-level signal-based suspend/resume support is a remnant from the | |
3987 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3988 // within hotspot. Now there is a single use-case for this: | |
3989 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3990 // that runs in the watcher thread. | |
3991 // The remaining code is greatly simplified from the more general suspension | |
3992 // code that used to be used. | |
3993 // | |
3994 // The protocol is quite simple: | |
3995 // - suspend: | |
3996 // - sends a signal to the target thread | |
3997 // - polls the suspend state of the osthread using a yield loop | |
3998 // - target thread signal handler (SR_handler) sets suspend state | |
3999 // and blocks in sigsuspend until continued | |
4000 // - resume: | |
4001 // - sets target osthread state to continue | |
4002 // - sends signal to end the sigsuspend loop in the SR_handler | |
4003 // | |
4004 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
4005 // | |
4006 | |
4007 static void resume_clear_context(OSThread *osthread) { | |
4008 osthread->set_ucontext(NULL); | |
4009 osthread->set_siginfo(NULL); | |
4010 } | |
4011 | |
4012 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
4013 osthread->set_ucontext(context); | |
4014 osthread->set_siginfo(siginfo); | |
4015 } | |
4016 | |
4017 // | |
4018 // Handler function invoked when a thread's execution is suspended or | |
4019 // resumed. We have to be careful that only async-safe functions are | |
4020 // called here (Note: most pthread functions are not async safe and | |
4021 // should be avoided.) | |
4022 // | |
4023 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
4024 // interface point of view, but sigwait() prevents the signal hander | |
4025 // from being run. libpthread would get very confused by not having | |
4026 // its signal handlers run and prevents sigwait()'s use with the | |
4027 // mutex granting granting signal. | |
4028 // | |
10405 | 4029 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
0 | 4030 // |
4031 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
4032 // Save and restore errno to avoid confusing native code with EINTR | |
4033 // after sigsuspend. | |
4034 int old_errno = errno; | |
4035 | |
4036 Thread* thread = Thread::current(); | |
4037 OSThread* osthread = thread->osthread(); | |
10405 | 4038 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
4039 | |
4040 os::SuspendResume::State current = osthread->sr.state(); | |
4041 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
0 | 4042 suspend_save_context(osthread, siginfo, context); |
4043 | |
10405 | 4044 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
4045 os::SuspendResume::State state = osthread->sr.suspended(); | |
4046 if (state == os::SuspendResume::SR_SUSPENDED) { | |
4047 sigset_t suspend_set; // signals for sigsuspend() | |
4048 | |
4049 // get current set of blocked signals and unblock resume signal | |
4050 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
4051 sigdelset(&suspend_set, SR_signum); | |
4052 | |
4053 sr_semaphore.signal(); | |
4054 // wait here until we are resumed | |
4055 while (1) { | |
4056 sigsuspend(&suspend_set); | |
4057 | |
4058 os::SuspendResume::State result = osthread->sr.running(); | |
4059 if (result == os::SuspendResume::SR_RUNNING) { | |
4060 sr_semaphore.signal(); | |
4061 break; | |
4062 } | |
4063 } | |
4064 | |
4065 } else if (state == os::SuspendResume::SR_RUNNING) { | |
4066 // request was cancelled, continue | |
4067 } else { | |
4068 ShouldNotReachHere(); | |
4069 } | |
0 | 4070 |
4071 resume_clear_context(osthread); | |
10405 | 4072 } else if (current == os::SuspendResume::SR_RUNNING) { |
4073 // request was cancelled, continue | |
4074 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4075 // ignore | |
0 | 4076 } else { |
10405 | 4077 // ignore |
0 | 4078 } |
4079 | |
4080 errno = old_errno; | |
4081 } | |
4082 | |
4083 | |
4084 static int SR_initialize() { | |
4085 struct sigaction act; | |
4086 char *s; | |
4087 /* Get signal number to use for suspend/resume */ | |
4088 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
4089 int sig = ::strtol(s, 0, 10); | |
4090 if (sig > 0 || sig < _NSIG) { | |
4091 SR_signum = sig; | |
4092 } | |
4093 } | |
4094 | |
4095 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
4096 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
4097 | |
4098 sigemptyset(&SR_sigset); | |
4099 sigaddset(&SR_sigset, SR_signum); | |
4100 | |
4101 /* Set up signal handler for suspend/resume */ | |
4102 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
4103 act.sa_handler = (void (*)(int)) SR_handler; | |
4104 | |
4105 // SR_signum is blocked by default. | |
4106 // 4528190 - We also need to block pthread restart signal (32 on all | |
4107 // supported Linux platforms). Note that LinuxThreads need to block | |
4108 // this signal for all threads to work properly. So we don't have | |
4109 // to use hard-coded signal number when setting up the mask. | |
4110 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
4111 | |
4112 if (sigaction(SR_signum, &act, 0) == -1) { | |
4113 return -1; | |
4114 } | |
4115 | |
4116 // Save signal flag | |
4117 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
4118 return 0; | |
4119 } | |
4120 | |
10405 | 4121 static int sr_notify(OSThread* osthread) { |
4122 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
4123 assert_status(status == 0, status, "pthread_kill"); | |
4124 return status; | |
4125 } | |
4126 | |
4127 // "Randomly" selected value for how long we want to spin | |
4128 // before bailing out on suspending a thread, also how often | |
4129 // we send a signal to a thread we want to resume | |
4130 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
4131 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
0 | 4132 |
4133 // returns true on success and false on error - really an error is fatal | |
4134 // but this seems the normal response to library errors | |
4135 static bool do_suspend(OSThread* osthread) { | |
10405 | 4136 assert(osthread->sr.is_running(), "thread should be running"); |
4137 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
4138 | |
0 | 4139 // mark as suspended and send signal |
10405 | 4140 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
4141 // failed to switch, state wasn't running? | |
4142 ShouldNotReachHere(); | |
4143 return false; | |
4144 } | |
4145 | |
4146 if (sr_notify(osthread) != 0) { | |
4147 ShouldNotReachHere(); | |
4148 } | |
4149 | |
4150 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
4151 while (true) { | |
4152 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4153 break; | |
4154 } else { | |
4155 // timeout | |
4156 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
4157 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
4158 return false; | |
4159 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
4160 // make sure that we consume the signal on the semaphore as well | |
4161 sr_semaphore.wait(); | |
4162 break; | |
4163 } else { | |
4164 ShouldNotReachHere(); | |
4165 return false; | |
4166 } | |
0 | 4167 } |
10405 | 4168 } |
4169 | |
4170 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
4171 return true; | |
0 | 4172 } |
4173 | |
4174 static void do_resume(OSThread* osthread) { | |
4175 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 4176 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
4177 | |
4178 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
4179 // failed to switch to WAKEUP_REQUEST | |
4180 ShouldNotReachHere(); | |
4181 return; | |
4182 } | |
4183 | |
4184 while (true) { | |
4185 if (sr_notify(osthread) == 0) { | |
4186 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
4187 if (osthread->sr.is_running()) { | |
4188 return; | |
4189 } | |
4190 } | |
4191 } else { | |
4192 ShouldNotReachHere(); | |
0 | 4193 } |
4194 } | |
10405 | 4195 |
4196 guarantee(osthread->sr.is_running(), "Must be running!"); | |
0 | 4197 } |
4198 | |
14909 | 4199 //////////////////////////////////////////////////////////////////////////////// |
4200 // interrupt support | |
4201 | |
4202 void os::interrupt(Thread* thread) { | |
4203 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4204 "possibility of dangling Thread pointer"); | |
4205 | |
4206 OSThread* osthread = thread->osthread(); | |
4207 | |
4208 if (!osthread->interrupted()) { | |
4209 osthread->set_interrupted(true); | |
4210 // More than one thread can get here with the same value of osthread, | |
4211 // resulting in multiple notifications. We do, however, want the store | |
4212 // to interrupted() to be visible to other threads before we execute unpark(). | |
4213 OrderAccess::fence(); | |
4214 ParkEvent * const slp = thread->_SleepEvent ; | |
4215 if (slp != NULL) slp->unpark() ; | |
4216 } | |
4217 | |
4218 // For JSR166. Unpark even if interrupt status already was set | |
4219 if (thread->is_Java_thread()) | |
4220 ((JavaThread*)thread)->parker()->unpark(); | |
4221 | |
4222 ParkEvent * ev = thread->_ParkEvent ; | |
4223 if (ev != NULL) ev->unpark() ; | |
4224 | |
4225 } | |
4226 | |
4227 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
4228 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
4229 "possibility of dangling Thread pointer"); | |
4230 | |
4231 OSThread* osthread = thread->osthread(); | |
4232 | |
4233 bool interrupted = osthread->interrupted(); | |
4234 | |
4235 if (interrupted && clear_interrupted) { | |
4236 osthread->set_interrupted(false); | |
4237 // consider thread->_SleepEvent->reset() ... optional optimization | |
4238 } | |
4239 | |
4240 return interrupted; | |
4241 } | |
4242 | |
0 | 4243 /////////////////////////////////////////////////////////////////////////////////// |
4244 // signal handling (except suspend/resume) | |
4245 | |
4246 // This routine may be used by user applications as a "hook" to catch signals. | |
4247 // The user-defined signal handler must pass unrecognized signals to this | |
4248 // routine, and if it returns true (non-zero), then the signal handler must | |
4249 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
4250 // routine will never retun false (zero), but instead will execute a VM panic | |
4251 // routine kill the process. | |
4252 // | |
4253 // If this routine returns false, it is OK to call it again. This allows | |
4254 // the user-defined signal handler to perform checks either before or after | |
4255 // the VM performs its own checks. Naturally, the user code would be making | |
4256 // a serious error if it tried to handle an exception (such as a null check | |
4257 // or breakpoint) that the VM was generating for its own correct operation. | |
4258 // | |
4259 // This routine may recognize any of the following kinds of signals: | |
4260 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
4261 // It should be consulted by handlers for any of those signals. | |
4262 // | |
4263 // The caller of this routine must pass in the three arguments supplied | |
4264 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
4265 // field of the structure passed to sigaction(). This routine assumes that | |
4266 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
4267 // | |
4268 // Note that the VM will print warnings if it detects conflicting signal | |
4269 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
4270 // | |
2191 | 4271 extern "C" JNIEXPORT int |
0 | 4272 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
4273 void* ucontext, int abort_if_unrecognized); | |
4274 | |
4275 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
4276 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 4277 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 4278 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 4279 errno = orig_errno; |
0 | 4280 } |
4281 | |
4282 | |
4283 // This boolean allows users to forward their own non-matching signals | |
4284 // to JVM_handle_linux_signal, harmlessly. | |
4285 bool os::Linux::signal_handlers_are_installed = false; | |
4286 | |
4287 // For signal-chaining | |
4288 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
4289 unsigned int os::Linux::sigs = 0; | |
4290 bool os::Linux::libjsig_is_loaded = false; | |
4291 typedef struct sigaction *(*get_signal_t)(int); | |
4292 get_signal_t os::Linux::get_signal_action = NULL; | |
4293 | |
4294 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
4295 struct sigaction *actp = NULL; | |
4296 | |
4297 if (libjsig_is_loaded) { | |
4298 // Retrieve the old signal handler from libjsig | |
4299 actp = (*get_signal_action)(sig); | |
4300 } | |
4301 if (actp == NULL) { | |
4302 // Retrieve the preinstalled signal handler from jvm | |
4303 actp = get_preinstalled_handler(sig); | |
4304 } | |
4305 | |
4306 return actp; | |
4307 } | |
4308 | |
4309 static bool call_chained_handler(struct sigaction *actp, int sig, | |
4310 siginfo_t *siginfo, void *context) { | |
4311 // Call the old signal handler | |
4312 if (actp->sa_handler == SIG_DFL) { | |
4313 // It's more reasonable to let jvm treat it as an unexpected exception | |
4314 // instead of taking the default action. | |
4315 return false; | |
4316 } else if (actp->sa_handler != SIG_IGN) { | |
4317 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
4318 // automaticlly block the signal | |
4319 sigaddset(&(actp->sa_mask), sig); | |
4320 } | |
4321 | |
4322 sa_handler_t hand; | |
4323 sa_sigaction_t sa; | |
4324 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
4325 // retrieve the chained handler | |
4326 if (siginfo_flag_set) { | |
4327 sa = actp->sa_sigaction; | |
4328 } else { | |
4329 hand = actp->sa_handler; | |
4330 } | |
4331 | |
4332 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
4333 actp->sa_handler = SIG_DFL; | |
4334 } | |
4335 | |
4336 // try to honor the signal mask | |
4337 sigset_t oset; | |
4338 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
4339 | |
4340 // call into the chained handler | |
4341 if (siginfo_flag_set) { | |
4342 (*sa)(sig, siginfo, context); | |
4343 } else { | |
4344 (*hand)(sig); | |
4345 } | |
4346 | |
4347 // restore the signal mask | |
4348 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
4349 } | |
4350 // Tell jvm's signal handler the signal is taken care of. | |
4351 return true; | |
4352 } | |
4353 | |
4354 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
4355 bool chained = false; | |
4356 // signal-chaining | |
4357 if (UseSignalChaining) { | |
4358 struct sigaction *actp = get_chained_signal_action(sig); | |
4359 if (actp != NULL) { | |
4360 chained = call_chained_handler(actp, sig, siginfo, context); | |
4361 } | |
4362 } | |
4363 return chained; | |
4364 } | |
4365 | |
4366 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
4367 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
4368 return &sigact[sig]; | |
4369 } | |
4370 return NULL; | |
4371 } | |
4372 | |
4373 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
4374 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4375 sigact[sig] = oldAct; | |
4376 sigs |= (unsigned int)1 << sig; | |
4377 } | |
4378 | |
4379 // for diagnostic | |
4380 int os::Linux::sigflags[MAXSIGNUM]; | |
4381 | |
4382 int os::Linux::get_our_sigflags(int sig) { | |
4383 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4384 return sigflags[sig]; | |
4385 } | |
4386 | |
4387 void os::Linux::set_our_sigflags(int sig, int flags) { | |
4388 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4389 sigflags[sig] = flags; | |
4390 } | |
4391 | |
4392 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
4393 // Check for overwrite. | |
4394 struct sigaction oldAct; | |
4395 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
4396 | |
4397 void* oldhand = oldAct.sa_sigaction | |
4398 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4399 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4400 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
4401 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
4402 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
4403 if (AllowUserSignalHandlers || !set_installed) { | |
4404 // Do not overwrite; user takes responsibility to forward to us. | |
4405 return; | |
4406 } else if (UseSignalChaining) { | |
4407 // save the old handler in jvm | |
4408 save_preinstalled_handler(sig, oldAct); | |
4409 // libjsig also interposes the sigaction() call below and saves the | |
4410 // old sigaction on it own. | |
4411 } else { | |
1490
f03d0a26bf83
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1353
diff
changeset
|
4412 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
f03d0a26bf83
6888954: argument formatting for assert() and friends
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1353
diff
changeset
|
4413 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 4414 } |
4415 } | |
4416 | |
4417 struct sigaction sigAct; | |
4418 sigfillset(&(sigAct.sa_mask)); | |
4419 sigAct.sa_handler = SIG_DFL; | |
4420 if (!set_installed) { | |
4421 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4422 } else { | |
4423 sigAct.sa_sigaction = signalHandler; | |
4424 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4425 } | |
4426 // Save flags, which are set by ours | |
4427 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4428 sigflags[sig] = sigAct.sa_flags; | |
4429 | |
4430 int ret = sigaction(sig, &sigAct, &oldAct); | |
4431 assert(ret == 0, "check"); | |
4432 | |
4433 void* oldhand2 = oldAct.sa_sigaction | |
4434 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4435 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4436 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
4437 } | |
4438 | |
4439 // install signal handlers for signals that HotSpot needs to | |
4440 // handle in order to support Java-level exception handling. | |
4441 | |
4442 void os::Linux::install_signal_handlers() { | |
4443 if (!signal_handlers_are_installed) { | |
4444 signal_handlers_are_installed = true; | |
4445 | |
4446 // signal-chaining | |
4447 typedef void (*signal_setting_t)(); | |
4448 signal_setting_t begin_signal_setting = NULL; | |
4449 signal_setting_t end_signal_setting = NULL; | |
4450 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4451 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
4452 if (begin_signal_setting != NULL) { | |
4453 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4454 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
4455 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
4456 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
4457 libjsig_is_loaded = true; | |
4458 assert(UseSignalChaining, "should enable signal-chaining"); | |
4459 } | |
4460 if (libjsig_is_loaded) { | |
4461 // Tell libjsig jvm is setting signal handlers | |
4462 (*begin_signal_setting)(); | |
4463 } | |
4464 | |
4465 set_signal_handler(SIGSEGV, true); | |
4466 set_signal_handler(SIGPIPE, true); | |
4467 set_signal_handler(SIGBUS, true); | |
4468 set_signal_handler(SIGILL, true); | |
4469 set_signal_handler(SIGFPE, true); | |
4470 set_signal_handler(SIGXFSZ, true); | |
4471 | |
4472 if (libjsig_is_loaded) { | |
4473 // Tell libjsig jvm finishes setting signal handlers | |
4474 (*end_signal_setting)(); | |
4475 } | |
4476 | |
4477 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3956
3607aac85aa9
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3913
diff
changeset
|
4478 // and if UserSignalHandler is installed all bets are off. |
3607aac85aa9
7051189: Need to suppress info message if -xcheck:jni used with libjsig.so
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parents:
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diff
changeset
|
4479 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 4480 if (CheckJNICalls) { |
4481 if (libjsig_is_loaded) { | |
3956
3607aac85aa9
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kevinw
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diff
changeset
|
4482 if (PrintJNIResolving) { |
3607aac85aa9
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diff
changeset
|
4483 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
3607aac85aa9
7051189: Need to suppress info message if -xcheck:jni used with libjsig.so
kevinw
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diff
changeset
|
4484 } |
0 | 4485 check_signals = false; |
4486 } | |
4487 if (AllowUserSignalHandlers) { | |
3956
3607aac85aa9
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kevinw
parents:
3913
diff
changeset
|
4488 if (PrintJNIResolving) { |
3607aac85aa9
7051189: Need to suppress info message if -xcheck:jni used with libjsig.so
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diff
changeset
|
4489 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
3607aac85aa9
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kevinw
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diff
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|
4490 } |
0 | 4491 check_signals = false; |
4492 } | |
4493 } | |
4494 } | |
4495 } | |
4496 | |
4497 // This is the fastest way to get thread cpu time on Linux. | |
4498 // Returns cpu time (user+sys) for any thread, not only for current. | |
4499 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
4500 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4501 // For reference, please, see IEEE Std 1003.1-2004: | |
4502 // http://www.unix.org/single_unix_specification | |
4503 | |
4504 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4505 struct timespec tp; | |
4506 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4507 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4508 | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
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diff
changeset
|
4509 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4510 } |
4511 | |
4512 ///// | |
4513 // glibc on Linux platform uses non-documented flag | |
4514 // to indicate, that some special sort of signal | |
4515 // trampoline is used. | |
4516 // We will never set this flag, and we should | |
4517 // ignore this flag in our diagnostic | |
4518 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4519 #undef SIGNIFICANT_SIGNAL_MASK | |
4520 #endif | |
4521 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4522 | |
4523 static const char* get_signal_handler_name(address handler, | |
4524 char* buf, int buflen) { | |
4525 int offset; | |
4526 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
4527 if (found) { | |
4528 // skip directory names | |
4529 const char *p1, *p2; | |
4530 p1 = buf; | |
4531 size_t len = strlen(os::file_separator()); | |
4532 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4533 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4534 } else { | |
4535 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4536 } | |
4537 return buf; | |
4538 } | |
4539 | |
4540 static void print_signal_handler(outputStream* st, int sig, | |
4541 char* buf, size_t buflen) { | |
4542 struct sigaction sa; | |
4543 | |
4544 sigaction(sig, NULL, &sa); | |
4545 | |
4546 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4547 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4548 | |
4549 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4550 | |
4551 address handler = (sa.sa_flags & SA_SIGINFO) | |
4552 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4553 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4554 | |
4555 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4556 st->print("SIG_DFL"); | |
4557 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4558 st->print("SIG_IGN"); | |
4559 } else { | |
4560 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4561 } | |
4562 | |
14909 | 4563 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); |
0 | 4564 |
4565 address rh = VMError::get_resetted_sighandler(sig); | |
4566 // May be, handler was resetted by VMError? | |
4567 if(rh != NULL) { | |
4568 handler = rh; | |
4569 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4570 } | |
4571 | |
14909 | 4572 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); |
0 | 4573 |
4574 // Check: is it our handler? | |
4575 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4576 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4577 // It is our signal handler | |
4578 // check for flags, reset system-used one! | |
4579 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4580 st->print( | |
4581 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4582 os::Linux::get_our_sigflags(sig)); | |
4583 } | |
4584 } | |
4585 st->cr(); | |
4586 } | |
4587 | |
4588 | |
4589 #define DO_SIGNAL_CHECK(sig) \ | |
4590 if (!sigismember(&check_signal_done, sig)) \ | |
4591 os::Linux::check_signal_handler(sig) | |
4592 | |
4593 // This method is a periodic task to check for misbehaving JNI applications | |
4594 // under CheckJNI, we can add any periodic checks here | |
4595 | |
4596 void os::run_periodic_checks() { | |
4597 | |
4598 if (check_signals == false) return; | |
4599 | |
4600 // SEGV and BUS if overridden could potentially prevent | |
4601 // generation of hs*.log in the event of a crash, debugging | |
4602 // such a case can be very challenging, so we absolutely | |
4603 // check the following for a good measure: | |
4604 DO_SIGNAL_CHECK(SIGSEGV); | |
4605 DO_SIGNAL_CHECK(SIGILL); | |
4606 DO_SIGNAL_CHECK(SIGFPE); | |
4607 DO_SIGNAL_CHECK(SIGBUS); | |
4608 DO_SIGNAL_CHECK(SIGPIPE); | |
4609 DO_SIGNAL_CHECK(SIGXFSZ); | |
14909 | 4610 |
0 | 4611 |
4612 // ReduceSignalUsage allows the user to override these handlers | |
4613 // see comments at the very top and jvm_solaris.h | |
4614 if (!ReduceSignalUsage) { | |
4615 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4616 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4617 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4618 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4619 } | |
4620 | |
4621 DO_SIGNAL_CHECK(SR_signum); | |
4622 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4623 } | |
4624 | |
4625 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4626 | |
4627 static os_sigaction_t os_sigaction = NULL; | |
4628 | |
4629 void os::Linux::check_signal_handler(int sig) { | |
4630 char buf[O_BUFLEN]; | |
4631 address jvmHandler = NULL; | |
4632 | |
4633 | |
4634 struct sigaction act; | |
4635 if (os_sigaction == NULL) { | |
4636 // only trust the default sigaction, in case it has been interposed | |
4637 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4638 if (os_sigaction == NULL) return; | |
4639 } | |
4640 | |
4641 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4642 | |
4643 | |
4644 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4645 | |
4646 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4647 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4648 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4649 | |
4650 | |
4651 switch(sig) { | |
4652 case SIGSEGV: | |
4653 case SIGBUS: | |
4654 case SIGFPE: | |
4655 case SIGPIPE: | |
4656 case SIGILL: | |
4657 case SIGXFSZ: | |
4658 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4659 break; | |
4660 | |
4661 case SHUTDOWN1_SIGNAL: | |
4662 case SHUTDOWN2_SIGNAL: | |
4663 case SHUTDOWN3_SIGNAL: | |
4664 case BREAK_SIGNAL: | |
4665 jvmHandler = (address)user_handler(); | |
4666 break; | |
4667 | |
4668 case INTERRUPT_SIGNAL: | |
4669 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4670 break; | |
4671 | |
4672 default: | |
4673 if (sig == SR_signum) { | |
4674 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4675 } else { | |
4676 return; | |
4677 } | |
4678 break; | |
4679 } | |
4680 | |
4681 if (thisHandler != jvmHandler) { | |
4682 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4683 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4684 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4685 // No need to check this sig any longer | |
4686 sigaddset(&check_signal_done, sig); | |
4687 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4688 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4689 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4690 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4691 // No need to check this sig any longer | |
4692 sigaddset(&check_signal_done, sig); | |
4693 } | |
4694 | |
4695 // Dump all the signal | |
4696 if (sigismember(&check_signal_done, sig)) { | |
4697 print_signal_handlers(tty, buf, O_BUFLEN); | |
4698 } | |
4699 } | |
4700 | |
4701 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4702 | |
4703 extern bool signal_name(int signo, char* buf, size_t len); | |
4704 | |
4705 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4706 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4707 // signal | |
4708 if (!signal_name(exception_code, buf, size)) { | |
4709 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4710 } | |
4711 return buf; | |
4712 } else { | |
4713 return NULL; | |
4714 } | |
4715 } | |
4716 | |
4717 // this is called _before_ the most of global arguments have been parsed | |
4718 void os::init(void) { | |
4719 char dummy; /* used to get a guess on initial stack address */ | |
4720 // first_hrtime = gethrtime(); | |
4721 | |
4722 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4723 // is different than the pid of the java launcher thread. | |
4724 // So, on Linux, the launcher thread pid is passed to the VM | |
4725 // via the sun.java.launcher.pid property. | |
4726 // Use this property instead of getpid() if it was correctly passed. | |
4727 // See bug 6351349. | |
4728 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4729 | |
4730 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4731 | |
4732 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4733 | |
4734 init_random(1234567); | |
4735 | |
4736 ThreadCritical::initialize(); | |
4737 | |
4738 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4739 if (Linux::page_size() == -1) { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
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|
4740 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4741 strerror(errno))); |
0 | 4742 } |
4743 init_page_sizes((size_t) Linux::page_size()); | |
4744 | |
4745 Linux::initialize_system_info(); | |
4746 | |
4747 // main_thread points to the aboriginal thread | |
4748 Linux::_main_thread = pthread_self(); | |
4749 | |
4750 Linux::clock_init(); | |
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12840
diff
changeset
|
4751 initial_time_count = javaTimeNanos(); |
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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parents:
12182
diff
changeset
|
4752 |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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parents:
12182
diff
changeset
|
4753 // 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
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parents:
12182
diff
changeset
|
4754 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
|
4755 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
|
4756 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
|
4757 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
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parents:
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diff
changeset
|
4758 } |
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 // Only set the clock if CLOCK_MONOTONIC is available |
14909 | 4760 if (Linux::supports_monotonic_clock()) { |
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
|
4761 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
|
4762 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
|
4763 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
|
4764 " - 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
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12182
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changeset
|
4765 } else { |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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parents:
12182
diff
changeset
|
4766 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
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12182
diff
changeset
|
4767 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
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diff
changeset
|
4768 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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diff
changeset
|
4769 } |
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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diff
changeset
|
4770 // 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
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changeset
|
4771 |
242 | 4772 pthread_mutex_init(&dl_mutex, NULL); |
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
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diff
changeset
|
4773 |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
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10157
diff
changeset
|
4774 // 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
|
4775 // 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
|
4776 // 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
|
4777 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
|
4778 StackYellowPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4779 StackRedPages = 1; |
b4081e9714ec
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vladidan
parents:
10157
diff
changeset
|
4780 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
b4081e9714ec
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vladidan
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diff
changeset
|
4781 } |
0 | 4782 } |
4783 | |
4784 // To install functions for atexit system call | |
4785 extern "C" { | |
4786 static void perfMemory_exit_helper() { | |
4787 perfMemory_exit(); | |
4788 } | |
4789 } | |
4790 | |
4791 // this is called _after_ the global arguments have been parsed | |
4792 jint os::init_2(void) | |
4793 { | |
4794 Linux::fast_thread_clock_init(); | |
4795 | |
4796 // Allocate a single page and mark it as readable for safepoint polling | |
4797 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4798 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4799 | |
4800 os::set_polling_page( polling_page ); | |
4801 | |
4802 #ifndef PRODUCT | |
4803 if(Verbose && PrintMiscellaneous) | |
4804 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4805 #endif | |
4806 | |
4807 if (!UseMembar) { | |
4808 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
|
4809 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
0 | 4810 os::set_memory_serialize_page( mem_serialize_page ); |
4811 | |
4812 #ifndef PRODUCT | |
4813 if(Verbose && PrintMiscellaneous) | |
4814 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4815 #endif | |
4816 } | |
4817 | |
4818 // initialize suspend/resume support - must do this before signal_sets_init() | |
4819 if (SR_initialize() != 0) { | |
4820 perror("SR_initialize failed"); | |
4821 return JNI_ERR; | |
4822 } | |
4823 | |
4824 Linux::signal_sets_init(); | |
4825 Linux::install_signal_handlers(); | |
4826 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4827 // 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
|
4828 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4829 // 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
|
4830 // 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
|
4831 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4832 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
|
4833 (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
|
4834 (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
|
4835 |
0 | 4836 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4837 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4838 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4839 tty->print_cr("\nThe stack size specified is too small, " |
4840 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4841 os::Linux::min_stack_allowed/ K); |
0 | 4842 return JNI_ERR; |
4843 } | |
4844 | |
4845 // Make the stack size a multiple of the page size so that | |
4846 // the yellow/red zones can be guarded. | |
4847 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4848 vm_page_size())); | |
4849 | |
4850 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4851 | |
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
|
4852 #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
|
4853 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
|
4854 #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
|
4855 |
0 | 4856 Linux::libpthread_init(); |
4857 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4858 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4859 Linux::glibc_version(), Linux::libpthread_version(), | |
4860 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4861 } | |
4862 | |
141 | 4863 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4864 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
|
4865 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4866 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4867 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
|
4868 // 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
|
4869 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4870 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4871 } |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4872 // 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
|
4873 // 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
|
4874 // 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
|
4875 // disable adaptive resizing. |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4876 if (UseNUMA && UseLargePages && !can_commit_large_page_memory()) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4877 if (FLAG_IS_DEFAULT(UseNUMA)) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4878 UseNUMA = false; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4879 } else { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4880 if (FLAG_IS_DEFAULT(UseLargePages) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4881 FLAG_IS_DEFAULT(UseSHM) && |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4882 FLAG_IS_DEFAULT(UseHugeTLBFS)) { |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4883 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4884 } else { |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4885 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
|
4886 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4887 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4888 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4889 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4890 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4891 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4892 UseNUMA = true; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4893 } |
141 | 4894 } |
4895 | |
0 | 4896 if (MaxFDLimit) { |
4897 // set the number of file descriptors to max. print out error | |
4898 // if getrlimit/setrlimit fails but continue regardless. | |
4899 struct rlimit nbr_files; | |
4900 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4901 if (status != 0) { | |
4902 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4903 perror("os::init_2 getrlimit failed"); | |
4904 } else { | |
4905 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4906 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4907 if (status != 0) { | |
4908 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4909 perror("os::init_2 setrlimit failed"); | |
4910 } | |
4911 } | |
4912 } | |
4913 | |
4914 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4915 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4916 | |
4917 // at-exit methods are called in the reverse order of their registration. | |
4918 // atexit functions are called on return from main or as a result of a | |
4919 // call to exit(3C). There can be only 32 of these functions registered | |
4920 // and atexit() does not set errno. | |
4921 | |
4922 if (PerfAllowAtExitRegistration) { | |
4923 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4924 // atexit functions can be delayed until process exit time, which | |
4925 // can be problematic for embedded VM situations. Embedded VMs should | |
4926 // call DestroyJavaVM() to assure that VM resources are released. | |
4927 | |
4928 // note: perfMemory_exit_helper atexit function may be removed in | |
4929 // the future if the appropriate cleanup code can be added to the | |
4930 // VM_Exit VMOperation's doit method. | |
4931 if (atexit(perfMemory_exit_helper) != 0) { | |
14909 | 4932 warning("os::init2 atexit(perfMemory_exit_helper) failed"); |
0 | 4933 } |
4934 } | |
4935 | |
4936 // initialize thread priority policy | |
4937 prio_init(); | |
4938 | |
4939 return JNI_OK; | |
4940 } | |
4941 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4942 // this is called at the end of vm_initialization |
14909 | 4943 void os::init_3(void) |
4944 { | |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4945 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4946 // Start the MemNotifyThread |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4947 if (LowMemoryProtection) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4948 MemNotifyThread::start(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4949 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4950 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4951 #endif |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4952 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4953 |
0 | 4954 // Mark the polling page as unreadable |
4955 void os::make_polling_page_unreadable(void) { | |
4956 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4957 fatal("Could not disable polling page"); | |
4958 }; | |
4959 | |
4960 // Mark the polling page as readable | |
4961 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4962 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4963 fatal("Could not enable polling page"); |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4964 } |
0 | 4965 }; |
4966 | |
4967 int os::active_processor_count() { | |
4968 // Linux doesn't yet have a (official) notion of processor sets, | |
4969 // so just return the number of online processors. | |
4970 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4971 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4972 return online_cpus; | |
4973 } | |
4974 | |
4006 | 4975 void os::set_native_thread_name(const char *name) { |
4976 // Not yet implemented. | |
4977 return; | |
4978 } | |
4979 | |
0 | 4980 bool os::distribute_processes(uint length, uint* distribution) { |
4981 // Not yet implemented. | |
4982 return false; | |
4983 } | |
4984 | |
4985 bool os::bind_to_processor(uint processor_id) { | |
4986 // Not yet implemented. | |
4987 return false; | |
4988 } | |
4989 | |
4990 /// | |
4991 | |
10405 | 4992 void os::SuspendedThreadTask::internal_do_task() { |
4993 if (do_suspend(_thread->osthread())) { | |
4994 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
4995 do_task(context); | |
4996 do_resume(_thread->osthread()); | |
4997 } | |
4998 } | |
4999 | |
5000 class PcFetcher : public os::SuspendedThreadTask { | |
5001 public: | |
5002 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
5003 ExtendedPC result(); | |
5004 protected: | |
5005 void do_task(const os::SuspendedThreadTaskContext& context); | |
5006 private: | |
5007 ExtendedPC _epc; | |
5008 }; | |
5009 | |
5010 ExtendedPC PcFetcher::result() { | |
5011 guarantee(is_done(), "task is not done yet."); | |
5012 return _epc; | |
5013 } | |
5014 | |
5015 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
5016 Thread* thread = context.thread(); | |
5017 OSThread* osthread = thread->osthread(); | |
5018 if (osthread->ucontext() != NULL) { | |
5019 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
5020 } else { | |
5021 // NULL context is unexpected, double-check this is the VMThread | |
5022 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
5023 } | |
5024 } | |
5025 | |
0 | 5026 // Suspends the target using the signal mechanism and then grabs the PC before |
5027 // resuming the target. Used by the flat-profiler only | |
5028 ExtendedPC os::get_thread_pc(Thread* thread) { | |
5029 // Make sure that it is called by the watcher for the VMThread | |
5030 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
5031 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
5032 | |
10405 | 5033 PcFetcher fetcher(thread); |
5034 fetcher.run(); | |
5035 return fetcher.result(); | |
0 | 5036 } |
5037 | |
16719
b1911c1e44c8
Dump disassembly in crash log
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14909
diff
changeset
|
5038 address os::get_pc(void* context) { |
b1911c1e44c8
Dump disassembly in crash log
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14909
diff
changeset
|
5039 ucontext_t *uc = (ucontext_t*)context; |
b1911c1e44c8
Dump disassembly in crash log
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14909
diff
changeset
|
5040 return os::Linux::ucontext_get_pc(uc); |
b1911c1e44c8
Dump disassembly in crash log
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14909
diff
changeset
|
5041 } |
b1911c1e44c8
Dump disassembly in crash log
Tom Rodriguez <tom.rodriguez@oracle.com>
parents:
14909
diff
changeset
|
5042 |
0 | 5043 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) |
5044 { | |
5045 if (is_NPTL()) { | |
5046 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5047 } else { | |
5048 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
5049 // word back to default 64bit precision if condvar is signaled. Java | |
5050 // wants 53bit precision. Save and restore current value. | |
5051 int fpu = get_fpu_control_word(); | |
5052 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
5053 set_fpu_control_word(fpu); | |
5054 return status; | |
5055 } | |
5056 } | |
5057 | |
5058 //////////////////////////////////////////////////////////////////////////////// | |
5059 // debug support | |
5060 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5061 bool os::find(address addr, outputStream* st) { |
0 | 5062 Dl_info dlinfo; |
5063 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
|
5064 if (dladdr(addr, &dlinfo) != 0) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5065 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
|
5066 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5067 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 5068 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
|
5069 } else if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5070 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 5071 } else { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5072 st->print("<absolute address>"); |
0 | 5073 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5074 if (dlinfo.dli_fname != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5075 st->print(" in %s", dlinfo.dli_fname); |
0 | 5076 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5077 if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5078 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 5079 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5080 st->cr(); |
0 | 5081 |
5082 if (Verbose) { | |
5083 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
5084 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
|
5085 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 5086 address lowest = (address) dlinfo.dli_sname; |
5087 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
5088 if (begin < lowest) begin = lowest; | |
5089 Dl_info dlinfo2; | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5090 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
0 | 5091 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
5092 end = (address) dlinfo2.dli_saddr; | |
1681
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parents:
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changeset
|
5093 Disassembler::decode(begin, end, st); |
0 | 5094 } |
5095 return true; | |
5096 } | |
5097 return false; | |
5098 } | |
5099 | |
5100 //////////////////////////////////////////////////////////////////////////////// | |
5101 // misc | |
5102 | |
5103 // This does not do anything on Linux. This is basically a hook for being | |
5104 // able to use structured exception handling (thread-local exception filters) | |
5105 // on, e.g., Win32. | |
5106 void | |
5107 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
5108 JavaCallArguments* args, Thread* thread) { | |
5109 f(value, method, args, thread); | |
5110 } | |
5111 | |
5112 void os::print_statistics() { | |
5113 } | |
5114 | |
5115 int os::message_box(const char* title, const char* message) { | |
5116 int i; | |
5117 fdStream err(defaultStream::error_fd()); | |
5118 for (i = 0; i < 78; i++) err.print_raw("="); | |
5119 err.cr(); | |
5120 err.print_raw_cr(title); | |
5121 for (i = 0; i < 78; i++) err.print_raw("-"); | |
5122 err.cr(); | |
5123 err.print_raw_cr(message); | |
5124 for (i = 0; i < 78; i++) err.print_raw("="); | |
5125 err.cr(); | |
5126 | |
5127 char buf[16]; | |
5128 // Prevent process from exiting upon "read error" without consuming all CPU | |
5129 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
5130 | |
5131 return buf[0] == 'y' || buf[0] == 'Y'; | |
5132 } | |
5133 | |
5134 int os::stat(const char *path, struct stat *sbuf) { | |
5135 char pathbuf[MAX_PATH]; | |
5136 if (strlen(path) > MAX_PATH - 1) { | |
5137 errno = ENAMETOOLONG; | |
5138 return -1; | |
5139 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5140 os::native_path(strcpy(pathbuf, path)); |
0 | 5141 return ::stat(pathbuf, sbuf); |
5142 } | |
5143 | |
5144 bool os::check_heap(bool force) { | |
5145 return true; | |
5146 } | |
5147 | |
5148 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
5149 return ::vsnprintf(buf, count, format, args); | |
5150 } | |
5151 | |
5152 // Is a (classpath) directory empty? | |
5153 bool os::dir_is_empty(const char* path) { | |
5154 DIR *dir = NULL; | |
5155 struct dirent *ptr; | |
5156 | |
5157 dir = opendir(path); | |
5158 if (dir == NULL) return true; | |
5159 | |
5160 /* Scan the directory */ | |
5161 bool result = true; | |
5162 char buf[sizeof(struct dirent) + MAX_PATH]; | |
5163 while (result && (ptr = ::readdir(dir)) != NULL) { | |
5164 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
5165 result = false; | |
5166 } | |
5167 } | |
5168 closedir(dir); | |
5169 return result; | |
5170 } | |
5171 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5172 // This code originates from JDK's sysOpen and open64_w |
828eafbd85cc
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diff
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|
5173 // from src/solaris/hpi/src/system_md.c |
828eafbd85cc
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1972
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|
5174 |
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6348631: remove the use of the HPI library from Hotspot
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|
5175 #ifndef O_DELETE |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
5176 #define O_DELETE 0x10000 |
828eafbd85cc
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ikrylov
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1972
diff
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|
5177 #endif |
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|
5178 |
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diff
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|
5179 // Open a file. Unlink the file immediately after open returns |
828eafbd85cc
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ikrylov
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diff
changeset
|
5180 // if the specified oflag has the O_DELETE flag set. |
828eafbd85cc
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ikrylov
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1972
diff
changeset
|
5181 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
828eafbd85cc
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ikrylov
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1972
diff
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|
5182 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5183 int os::open(const char *path, int oflag, int mode) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
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|
5184 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
5185 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
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|
5186 errno = ENAMETOOLONG; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
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|
5187 return -1; |
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 int fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5190 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5191 oflag = oflag & ~O_DELETE; |
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
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1972
diff
changeset
|
5193 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5194 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5195 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5196 //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
|
5197 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5198 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5199 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5200 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5201 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5202 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5203 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5204 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5205 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5206 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5207 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5208 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5209 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5210 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5211 } |
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 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5214 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5215 * 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
|
5216 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5217 * 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
|
5218 * 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
|
5219 * 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
|
5220 * UNIXProcess.c), and this in turn might: |
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 * - 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
|
5223 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5224 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5225 * - 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
|
5226 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5227 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5228 * (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
|
5229 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5230 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5231 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5232 * 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
|
5233 * 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
|
5234 * 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
|
5235 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5236 #ifdef FD_CLOEXEC |
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 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5239 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5240 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5241 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5242 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5243 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5244 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5245 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5246 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5247 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5248 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5249 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5250 |
0 | 5251 // create binary file, rewriting existing file if required |
5252 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
5253 int oflags = O_WRONLY | O_CREAT; | |
5254 if (!rewrite_existing) { | |
5255 oflags |= O_EXCL; | |
5256 } | |
5257 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
5258 } | |
5259 | |
5260 // return current position of file pointer | |
5261 jlong os::current_file_offset(int fd) { | |
5262 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
5263 } | |
5264 | |
5265 // move file pointer to the specified offset | |
5266 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
5267 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
5268 } | |
5269 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5270 // This code originates from JDK's sysAvailable |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5271 // 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
|
5272 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5273 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5274 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5275 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5276 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5277 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
5278 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5279 mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5280 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
|
5281 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5282 * 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
|
5283 * 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
|
5284 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5285 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5286 int n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5287 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5288 *bytes = n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5289 return 1; |
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 } |
828eafbd85cc
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diff
changeset
|
5292 } |
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diff
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|
5293 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
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diff
changeset
|
5294 return 0; |
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diff
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|
5295 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
828eafbd85cc
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diff
changeset
|
5296 return 0; |
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diff
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|
5297 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
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diff
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|
5298 return 0; |
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diff
changeset
|
5299 } |
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6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5300 *bytes = end - cur; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5301 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
5302 } |
828eafbd85cc
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diff
changeset
|
5303 |
2033
03e1b9fce89d
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changeset
|
5304 int os::socket_available(int fd, jint *pbytes) { |
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diff
changeset
|
5305 // Linux doc says EINTR not returned, unlike Solaris |
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|
5306 int ret = ::ioctl(fd, FIONREAD, pbytes); |
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diff
changeset
|
5307 |
03e1b9fce89d
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diff
changeset
|
5308 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
03e1b9fce89d
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2023
diff
changeset
|
5309 // is expected to return 0 on failure and 1 on success to the jdk. |
03e1b9fce89d
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diff
changeset
|
5310 return (ret < 0) ? 0 : 1; |
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7003707: need to remove (some) system include files from the HotSpot header files
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parents:
2023
diff
changeset
|
5311 } |
03e1b9fce89d
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|
5312 |
0 | 5313 // Map a block of memory. |
6197 | 5314 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5315 char *addr, size_t bytes, bool read_only, |
5316 bool allow_exec) { | |
5317 int prot; | |
5909 | 5318 int flags = MAP_PRIVATE; |
0 | 5319 |
5320 if (read_only) { | |
5321 prot = PROT_READ; | |
5322 } else { | |
5323 prot = PROT_READ | PROT_WRITE; | |
5324 } | |
5325 | |
5326 if (allow_exec) { | |
5327 prot |= PROT_EXEC; | |
5328 } | |
5329 | |
5330 if (addr != NULL) { | |
5331 flags |= MAP_FIXED; | |
5332 } | |
5333 | |
5334 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
5335 fd, file_offset); | |
5336 if (mapped_address == MAP_FAILED) { | |
5337 return NULL; | |
5338 } | |
5339 return mapped_address; | |
5340 } | |
5341 | |
5342 | |
5343 // Remap a block of memory. | |
6197 | 5344 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5345 char *addr, size_t bytes, bool read_only, |
5346 bool allow_exec) { | |
5347 // same as map_memory() on this OS | |
5348 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
5349 allow_exec); | |
5350 } | |
5351 | |
5352 | |
5353 // Unmap a block of memory. | |
6197 | 5354 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 5355 return munmap(addr, bytes) == 0; |
5356 } | |
5357 | |
5358 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
5359 | |
5360 static clockid_t thread_cpu_clockid(Thread* thread) { | |
5361 pthread_t tid = thread->osthread()->pthread_id(); | |
5362 clockid_t clockid; | |
5363 | |
5364 // Get thread clockid | |
5365 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
5366 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
5367 return clockid; | |
5368 } | |
5369 | |
5370 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
5371 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
5372 // of a thread. | |
5373 // | |
5374 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
5375 // the fast estimate available on the platform. | |
5376 | |
5377 jlong os::current_thread_cpu_time() { | |
5378 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5379 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5380 } else { | |
5381 // return user + sys since the cost is the same | |
5382 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
5383 } | |
5384 } | |
5385 | |
5386 jlong os::thread_cpu_time(Thread* thread) { | |
5387 // consistent with what current_thread_cpu_time() returns | |
5388 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5389 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5390 } else { | |
5391 return slow_thread_cpu_time(thread, true /* user + sys */); | |
5392 } | |
5393 } | |
5394 | |
5395 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
5396 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5397 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5398 } else { | |
5399 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
5400 } | |
5401 } | |
5402 | |
5403 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5404 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5405 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5406 } else { | |
5407 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
5408 } | |
5409 } | |
5410 | |
5411 // | |
5412 // -1 on error. | |
5413 // | |
5414 | |
5415 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5416 static bool proc_task_unchecked = true; | |
5417 static const char *proc_stat_path = "/proc/%d/stat"; | |
5418 pid_t tid = thread->osthread()->thread_id(); | |
5419 char *s; | |
5420 char stat[2048]; | |
5421 int statlen; | |
5422 char proc_name[64]; | |
5423 int count; | |
5424 long sys_time, user_time; | |
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|
5425 char cdummy; |
0 | 5426 int idummy; |
5427 long ldummy; | |
5428 FILE *fp; | |
5429 | |
5430 // The /proc/<tid>/stat aggregates per-process usage on | |
5431 // new Linux kernels 2.6+ where NPTL is supported. | |
5432 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
5433 // See bug 6328462. | |
8099
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diff
changeset
|
5434 // There possibly can be cases where there is no directory |
4c1d8002ffb1
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diff
changeset
|
5435 // /proc/self/task, so we check its availability. |
0 | 5436 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
5437 // This is executed only once | |
5438 proc_task_unchecked = false; | |
5439 fp = fopen("/proc/self/task", "r"); | |
5440 if (fp != NULL) { | |
5441 proc_stat_path = "/proc/self/task/%d/stat"; | |
5442 fclose(fp); | |
5443 } | |
5444 } | |
5445 | |
5446 sprintf(proc_name, proc_stat_path, tid); | |
5447 fp = fopen(proc_name, "r"); | |
5448 if ( fp == NULL ) return -1; | |
5449 statlen = fread(stat, 1, 2047, fp); | |
5450 stat[statlen] = '\0'; | |
5451 fclose(fp); | |
5452 | |
5453 // Skip pid and the command string. Note that we could be dealing with | |
5454 // weird command names, e.g. user could decide to rename java launcher | |
5455 // to "java 1.4.2 :)", then the stat file would look like | |
5456 // 1234 (java 1.4.2 :)) R ... ... | |
5457 // We don't really need to know the command string, just find the last | |
5458 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
5459 s = strrchr(stat, ')'); | |
5460 if (s == NULL ) return -1; | |
5461 | |
5462 // Skip blank chars | |
5463 do s++; while (isspace(*s)); | |
5464 | |
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|
5465 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
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|
5466 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 5467 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
5468 &user_time, &sys_time); | |
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|
5469 if ( count != 13 ) return -1; |
0 | 5470 if (user_sys_cpu_time) { |
5471 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
5472 } else { | |
5473 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
5474 } | |
5475 } | |
5476 | |
5477 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5478 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5479 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5480 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5481 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5482 } | |
5483 | |
5484 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5485 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5486 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5487 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5488 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5489 } | |
5490 | |
5491 bool os::is_thread_cpu_time_supported() { | |
5492 return true; | |
5493 } | |
5494 | |
5495 // System loadavg support. Returns -1 if load average cannot be obtained. | |
5496 // Linux doesn't yet have a (official) notion of processor sets, | |
5497 // so just return the system wide load average. | |
5498 int os::loadavg(double loadavg[], int nelem) { | |
5499 return ::getloadavg(loadavg, nelem); | |
5500 } | |
5501 | |
5502 void os::pause() { | |
5503 char filename[MAX_PATH]; | |
5504 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
5505 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
5506 } else { | |
5507 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
5508 } | |
5509 | |
5510 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
5511 if (fd != -1) { | |
5512 struct stat buf; | |
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diff
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|
5513 ::close(fd); |
0 | 5514 while (::stat(filename, &buf) == 0) { |
5515 (void)::poll(NULL, 0, 100); | |
5516 } | |
5517 } else { | |
5518 jio_fprintf(stderr, | |
5519 "Could not open pause file '%s', continuing immediately.\n", filename); | |
5520 } | |
5521 } | |
5522 | |
5523 | |
5524 // Refer to the comments in os_solaris.cpp park-unpark. | |
5525 // | |
5526 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
5527 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
5528 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
5529 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
5530 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
5531 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
5532 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
5533 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
5534 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
5535 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
5536 // of libpthread avoids the problem, but isn't practical. | |
5537 // | |
5538 // Possible remedies: | |
5539 // | |
5540 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
5541 // This is palliative and probabilistic, however. If the thread is preempted | |
5542 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
5543 // than the minimum period may have passed, and the abstime may be stale (in the | |
5544 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
5545 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
5546 // | |
5547 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
5548 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
5549 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
5550 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
5551 // thread. | |
5552 // | |
5553 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
5554 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
5555 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
5556 // This also works well. In fact it avoids kernel-level scalability impediments | |
5557 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
5558 // timers in a graceful fashion. | |
5559 // | |
5560 // 4. When the abstime value is in the past it appears that control returns | |
5561 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5562 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5563 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5564 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5565 // It may be possible to avoid reinitialization by checking the return | |
5566 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5567 // condvar we must establish the invariant that cond_signal() is only called | |
5568 // within critical sections protected by the adjunct mutex. This prevents | |
5569 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5570 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5571 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5572 // | |
5573 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5574 // structure when a condvar is used or initialized. cond_destroy() would | |
5575 // release the helper structure. Our reinitialize-after-timedwait fix | |
5576 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5577 // | |
5578 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5579 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5580 // and only enabling the work-around for vulnerable environments. | |
5581 | |
5582 // utility to compute the abstime argument to timedwait: | |
5583 // millis is the relative timeout time | |
5584 // abstime will be the absolute timeout time | |
5585 // TODO: replace compute_abstime() with unpackTime() | |
5586 | |
5587 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5588 if (millis < 0) millis = 0; | |
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5589 |
0 | 5590 jlong seconds = millis / 1000; |
5591 millis %= 1000; | |
5592 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5593 seconds = 50000000; | |
5594 } | |
12211
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5595 |
14909 | 5596 if (os::Linux::supports_monotonic_clock()) { |
12211
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|
5597 struct timespec now; |
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|
5598 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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|
5599 assert_status(status == 0, status, "clock_gettime"); |
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5600 abstime->tv_sec = now.tv_sec + seconds; |
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|
5601 long nanos = now.tv_nsec + millis * NANOSECS_PER_MILLISEC; |
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|
5602 if (nanos >= NANOSECS_PER_SEC) { |
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|
5603 abstime->tv_sec += 1; |
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5604 nanos -= NANOSECS_PER_SEC; |
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|
5605 } |
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|
5606 abstime->tv_nsec = nanos; |
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5607 } else { |
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|
5608 struct timeval now; |
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|
5609 int status = gettimeofday(&now, NULL); |
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|
5610 assert(status == 0, "gettimeofday"); |
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5611 abstime->tv_sec = now.tv_sec + seconds; |
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5612 long usec = now.tv_usec + millis * 1000; |
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|
5613 if (usec >= 1000000) { |
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|
5614 abstime->tv_sec += 1; |
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|
5615 usec -= 1000000; |
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5616 } |
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5617 abstime->tv_nsec = usec * 1000; |
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5618 } |
0 | 5619 return abstime; |
5620 } | |
5621 | |
5622 | |
5623 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5624 // Conceptually TryPark() should be equivalent to park(0). | |
5625 | |
5626 int os::PlatformEvent::TryPark() { | |
5627 for (;;) { | |
5628 const int v = _Event ; | |
5629 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5630 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5631 } | |
5632 } | |
5633 | |
5634 void os::PlatformEvent::park() { // AKA "down()" | |
5635 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5636 // may call park(). | |
5637 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5638 int v ; | |
5639 for (;;) { | |
5640 v = _Event ; | |
5641 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5642 } | |
5643 guarantee (v >= 0, "invariant") ; | |
5644 if (v == 0) { | |
5645 // Do this the hard way by blocking ... | |
5646 int status = pthread_mutex_lock(_mutex); | |
5647 assert_status(status == 0, status, "mutex_lock"); | |
5648 guarantee (_nParked == 0, "invariant") ; | |
5649 ++ _nParked ; | |
5650 while (_Event < 0) { | |
5651 status = pthread_cond_wait(_cond, _mutex); | |
5652 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5653 // Treat this the same as if the wait was interrupted | |
5654 if (status == ETIME) { status = EINTR; } | |
5655 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5656 } | |
5657 -- _nParked ; | |
5658 | |
5659 _Event = 0 ; | |
5660 status = pthread_mutex_unlock(_mutex); | |
5661 assert_status(status == 0, status, "mutex_unlock"); | |
7629
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5662 // Paranoia to ensure our locked and lock-free paths interact |
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5663 // correctly with each other. |
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5664 OrderAccess::fence(); |
0 | 5665 } |
5666 guarantee (_Event >= 0, "invariant") ; | |
5667 } | |
5668 | |
5669 int os::PlatformEvent::park(jlong millis) { | |
5670 guarantee (_nParked == 0, "invariant") ; | |
5671 | |
5672 int v ; | |
5673 for (;;) { | |
5674 v = _Event ; | |
5675 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5676 } | |
5677 guarantee (v >= 0, "invariant") ; | |
5678 if (v != 0) return OS_OK ; | |
5679 | |
5680 // We do this the hard way, by blocking the thread. | |
5681 // Consider enforcing a minimum timeout value. | |
5682 struct timespec abst; | |
5683 compute_abstime(&abst, millis); | |
5684 | |
5685 int ret = OS_TIMEOUT; | |
5686 int status = pthread_mutex_lock(_mutex); | |
5687 assert_status(status == 0, status, "mutex_lock"); | |
5688 guarantee (_nParked == 0, "invariant") ; | |
5689 ++_nParked ; | |
5690 | |
5691 // Object.wait(timo) will return because of | |
5692 // (a) notification | |
5693 // (b) timeout | |
5694 // (c) thread.interrupt | |
5695 // | |
5696 // Thread.interrupt and object.notify{All} both call Event::set. | |
5697 // That is, we treat thread.interrupt as a special case of notification. | |
5698 // The underlying Solaris implementation, cond_timedwait, admits | |
5699 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5700 // JVM from making those visible to Java code. As such, we must | |
5701 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5702 // | |
5703 // TODO: properly differentiate simultaneous notify+interrupt. | |
5704 // In that case, we should propagate the notify to another waiter. | |
5705 | |
5706 while (_Event < 0) { | |
5707 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5708 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5709 pthread_cond_destroy (_cond); | |
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5710 pthread_cond_init (_cond, os::Linux::condAttr()) ; |
0 | 5711 } |
5712 assert_status(status == 0 || status == EINTR || | |
5713 status == ETIME || status == ETIMEDOUT, | |
5714 status, "cond_timedwait"); | |
5715 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5716 if (status == ETIME || status == ETIMEDOUT) break ; | |
5717 // We consume and ignore EINTR and spurious wakeups. | |
5718 } | |
5719 --_nParked ; | |
5720 if (_Event >= 0) { | |
5721 ret = OS_OK; | |
5722 } | |
5723 _Event = 0 ; | |
5724 status = pthread_mutex_unlock(_mutex); | |
5725 assert_status(status == 0, status, "mutex_unlock"); | |
5726 assert (_nParked == 0, "invariant") ; | |
7629
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5727 // Paranoia to ensure our locked and lock-free paths interact |
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5728 // correctly with each other. |
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5729 OrderAccess::fence(); |
0 | 5730 return ret; |
5731 } | |
5732 | |
5733 void os::PlatformEvent::unpark() { | |
7629
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5734 // Transitions for _Event: |
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5735 // 0 :=> 1 |
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5736 // 1 :=> 1 |
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5737 // -1 :=> either 0 or 1; must signal target thread |
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5738 // That is, we can safely transition _Event from -1 to either |
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5739 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5740 // unpark() calls. |
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5741 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5742 // |
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5743 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5744 // that it will take two back-to-back park() calls for the owning |
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5745 // thread to block. This has the benefit of forcing a spurious return |
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5746 // from the first park() call after an unpark() call which will help |
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5747 // shake out uses of park() and unpark() without condition variables. |
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5748 |
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5749 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5750 |
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5751 // Wait for the thread associated with the event to vacate |
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5752 int status = pthread_mutex_lock(_mutex); |
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5753 assert_status(status == 0, status, "mutex_lock"); |
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5754 int AnyWaiters = _nParked; |
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5755 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5756 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5757 AnyWaiters = 0; |
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5758 pthread_cond_signal(_cond); |
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5759 } |
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5760 status = pthread_mutex_unlock(_mutex); |
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5761 assert_status(status == 0, status, "mutex_unlock"); |
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5762 if (AnyWaiters != 0) { |
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5763 status = pthread_cond_signal(_cond); |
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5764 assert_status(status == 0, status, "cond_signal"); |
0 | 5765 } |
5766 | |
5767 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5768 // This is safe and avoids a common class of futile wakeups. In rare | |
5769 // circumstances this can cause a thread to return prematurely from | |
5770 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5771 // simply re-test the condition and re-park itself. | |
5772 } | |
5773 | |
5774 | |
5775 // JSR166 | |
5776 // ------------------------------------------------------- | |
5777 | |
5778 /* | |
5779 * The solaris and linux implementations of park/unpark are fairly | |
5780 * conservative for now, but can be improved. They currently use a | |
5781 * mutex/condvar pair, plus a a count. | |
5782 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5783 * sets count to 1 and signals condvar. Only one thread ever waits | |
5784 * on the condvar. Contention seen when trying to park implies that someone | |
5785 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5786 * is no need to track notifications. | |
5787 */ | |
5788 | |
5789 #define MAX_SECS 100000000 | |
5790 /* | |
5791 * This code is common to linux and solaris and will be moved to a | |
5792 * common place in dolphin. | |
5793 * | |
5794 * The passed in time value is either a relative time in nanoseconds | |
5795 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5796 * into suitable seconds and nanoseconds components and stored in the | |
5797 * given timespec structure. | |
5798 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5799 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5800 * overflow if times way in the future are given. Further on Solaris versions | |
5801 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5802 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5803 * As it will be 28 years before "now + 100000000" will overflow we can | |
5804 * ignore overflow and just impose a hard-limit on seconds using the value | |
5805 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5806 * years from "now". | |
5807 */ | |
5808 | |
5809 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5810 assert (time > 0, "convertTime"); | |
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5811 time_t max_secs = 0; |
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5812 |
14909 | 5813 if (!os::Linux::supports_monotonic_clock() || isAbsolute) { |
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5814 struct timeval now; |
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5815 int status = gettimeofday(&now, NULL); |
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5816 assert(status == 0, "gettimeofday"); |
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5817 |
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5818 max_secs = now.tv_sec + MAX_SECS; |
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5819 |
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5820 if (isAbsolute) { |
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5821 jlong secs = time / 1000; |
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5822 if (secs > max_secs) { |
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5823 absTime->tv_sec = max_secs; |
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5824 } else { |
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5825 absTime->tv_sec = secs; |
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5826 } |
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5827 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; |
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5828 } else { |
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5829 jlong secs = time / NANOSECS_PER_SEC; |
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5830 if (secs >= MAX_SECS) { |
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5831 absTime->tv_sec = max_secs; |
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5832 absTime->tv_nsec = 0; |
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5833 } else { |
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5834 absTime->tv_sec = now.tv_sec + secs; |
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5835 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; |
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5836 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
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5837 absTime->tv_nsec -= NANOSECS_PER_SEC; |
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5838 ++absTime->tv_sec; // note: this must be <= max_secs |
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5839 } |
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5840 } |
0 | 5841 } |
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5842 } else { |
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5843 // must be relative using monotonic clock |
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5844 struct timespec now; |
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5845 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
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5846 assert_status(status == 0, status, "clock_gettime"); |
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5847 max_secs = now.tv_sec + MAX_SECS; |
0 | 5848 jlong secs = time / NANOSECS_PER_SEC; |
5849 if (secs >= MAX_SECS) { | |
5850 absTime->tv_sec = max_secs; | |
5851 absTime->tv_nsec = 0; | |
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5852 } else { |
0 | 5853 absTime->tv_sec = now.tv_sec + secs; |
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|
5854 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_nsec; |
0 | 5855 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
5856 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5857 ++absTime->tv_sec; // note: this must be <= max_secs | |
5858 } | |
5859 } | |
5860 } | |
5861 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5862 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5863 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5864 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5865 } | |
5866 | |
5867 void Parker::park(bool isAbsolute, jlong time) { | |
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diff
changeset
|
5868 // Ideally we'd do something useful while spinning, such |
22ba8c8ce6a6
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diff
changeset
|
5869 // as calling unpackTime(). |
22ba8c8ce6a6
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diff
changeset
|
5870 |
0 | 5871 // Optional fast-path check: |
5872 // Return immediately if a permit is available. | |
7629
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diff
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|
5873 // We depend on Atomic::xchg() having full barrier semantics |
22ba8c8ce6a6
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|
5874 // since we are doing a lock-free update to _counter. |
22ba8c8ce6a6
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diff
changeset
|
5875 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5876 |
5877 Thread* thread = Thread::current(); | |
5878 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5879 JavaThread *jt = (JavaThread *)thread; | |
5880 | |
5881 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5882 // Check interrupt before trying to wait | |
5883 if (Thread::is_interrupted(thread, false)) { | |
5884 return; | |
5885 } | |
5886 | |
5887 // Next, demultiplex/decode time arguments | |
5888 timespec absTime; | |
1865
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diff
changeset
|
5889 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5890 return; |
5891 } | |
5892 if (time > 0) { | |
5893 unpackTime(&absTime, isAbsolute, time); | |
5894 } | |
5895 | |
5896 | |
5897 // Enter safepoint region | |
5898 // Beware of deadlocks such as 6317397. | |
5899 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5900 // In particular a thread must never block on the Threads_lock while | |
5901 // holding the Parker:: mutex. If safepoints are pending both the | |
5902 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5903 ThreadBlockInVM tbivm(jt); | |
5904 | |
5905 // Don't wait if cannot get lock since interference arises from | |
5906 // unblocking. Also. check interrupt before trying wait | |
5907 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5908 return; | |
5909 } | |
5910 | |
5911 int status ; | |
5912 if (_counter > 0) { // no wait needed | |
5913 _counter = 0; | |
5914 status = pthread_mutex_unlock(_mutex); | |
5915 assert (status == 0, "invariant") ; | |
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|
5916 // Paranoia to ensure our locked and lock-free paths interact |
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|
5917 // correctly with each other and Java-level accesses. |
1117
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6822370: ReentrantReadWriteLock: threads hung when there are no threads holding onto the lock (Netra x4450)
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diff
changeset
|
5918 OrderAccess::fence(); |
0 | 5919 return; |
5920 } | |
5921 | |
5922 #ifdef ASSERT | |
5923 // Don't catch signals while blocked; let the running threads have the signals. | |
5924 // (This allows a debugger to break into the running thread.) | |
5925 sigset_t oldsigs; | |
5926 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5927 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5928 #endif | |
5929 | |
5930 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5931 jt->set_suspend_equivalent(); | |
5932 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5933 | |
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|
5934 assert(_cur_index == -1, "invariant"); |
0 | 5935 if (time == 0) { |
12211
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|
5936 _cur_index = REL_INDEX; // arbitrary choice when not timed |
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|
5937 status = pthread_cond_wait (&_cond[_cur_index], _mutex) ; |
0 | 5938 } else { |
12211
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|
5939 _cur_index = isAbsolute ? ABS_INDEX : REL_INDEX; |
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|
5940 status = os::Linux::safe_cond_timedwait (&_cond[_cur_index], _mutex, &absTime) ; |
0 | 5941 if (status != 0 && WorkAroundNPTLTimedWaitHang) { |
12211
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|
5942 pthread_cond_destroy (&_cond[_cur_index]) ; |
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|
5943 pthread_cond_init (&_cond[_cur_index], isAbsolute ? NULL : os::Linux::condAttr()); |
0 | 5944 } |
5945 } | |
12211
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|
5946 _cur_index = -1; |
0 | 5947 assert_status(status == 0 || status == EINTR || |
5948 status == ETIME || status == ETIMEDOUT, | |
5949 status, "cond_timedwait"); | |
5950 | |
5951 #ifdef ASSERT | |
5952 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5953 #endif | |
5954 | |
5955 _counter = 0 ; | |
5956 status = pthread_mutex_unlock(_mutex) ; | |
5957 assert_status(status == 0, status, "invariant") ; | |
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|
5958 // Paranoia to ensure our locked and lock-free paths interact |
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diff
changeset
|
5959 // correctly with each other and Java-level accesses. |
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diff
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|
5960 OrderAccess::fence(); |
22ba8c8ce6a6
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changeset
|
5961 |
0 | 5962 // If externally suspended while waiting, re-suspend |
5963 if (jt->handle_special_suspend_equivalent_condition()) { | |
5964 jt->java_suspend_self(); | |
5965 } | |
5966 } | |
5967 | |
5968 void Parker::unpark() { | |
5969 int s, status ; | |
5970 status = pthread_mutex_lock(_mutex); | |
5971 assert (status == 0, "invariant") ; | |
5972 s = _counter; | |
5973 _counter = 1; | |
5974 if (s < 1) { | |
12211
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|
5975 // thread might be parked |
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|
5976 if (_cur_index != -1) { |
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changeset
|
5977 // thread is definitely parked |
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|
5978 if (WorkAroundNPTLTimedWaitHang) { |
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|
5979 status = pthread_cond_signal (&_cond[_cur_index]); |
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|
5980 assert (status == 0, "invariant"); |
0 | 5981 status = pthread_mutex_unlock(_mutex); |
12211
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|
5982 assert (status == 0, "invariant"); |
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|
5983 } else { |
0 | 5984 status = pthread_mutex_unlock(_mutex); |
12211
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|
5985 assert (status == 0, "invariant"); |
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|
5986 status = pthread_cond_signal (&_cond[_cur_index]); |
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|
5987 assert (status == 0, "invariant"); |
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|
5988 } |
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|
5989 } else { |
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|
5990 pthread_mutex_unlock(_mutex); |
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|
5991 assert (status == 0, "invariant") ; |
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|
5992 } |
0 | 5993 } else { |
5994 pthread_mutex_unlock(_mutex); | |
5995 assert (status == 0, "invariant") ; | |
5996 } | |
5997 } | |
5998 | |
5999 | |
6000 extern char** environ; | |
6001 | |
6002 #ifndef __NR_fork | |
6003 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
6004 #endif | |
6005 | |
6006 #ifndef __NR_execve | |
6007 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
6008 #endif | |
6009 | |
6010 // Run the specified command in a separate process. Return its exit value, | |
6011 // or -1 on failure (e.g. can't fork a new process). | |
6012 // Unlike system(), this function can be called from signal handler. It | |
6013 // doesn't block SIGINT et al. | |
6014 int os::fork_and_exec(char* cmd) { | |
199
f139919897d2
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xlu
parents:
141
diff
changeset
|
6015 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 6016 |
6017 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
6018 // pthread_atfork handlers and reset pthread library. All we need is a | |
6019 // separate process to execve. Make a direct syscall to fork process. | |
6020 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
6021 // the best... | |
6022 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
6023 IA64_ONLY(fork();) | |
6024 | |
6025 if (pid < 0) { | |
6026 // fork failed | |
6027 return -1; | |
6028 | |
6029 } else if (pid == 0) { | |
6030 // child process | |
6031 | |
6032 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
6033 // first to kill every thread on the thread list. Because this list is | |
6034 // not reset by fork() (see notes above), execve() will instead kill | |
6035 // every thread in the parent process. We know this is the only thread | |
6036 // in the new process, so make a system call directly. | |
6037 // IA64 should use normal execve() from glibc to match the glibc fork() | |
6038 // above. | |
6039 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
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f139919897d2
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parents:
141
diff
changeset
|
6040 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 6041 |
6042 // execve failed | |
6043 _exit(-1); | |
6044 | |
6045 } else { | |
6046 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
6047 // care about the actual exit code, for now. | |
6048 | |
6049 int status; | |
6050 | |
6051 // Wait for the child process to exit. This returns immediately if | |
6052 // the child has already exited. */ | |
6053 while (waitpid(pid, &status, 0) < 0) { | |
6054 switch (errno) { | |
6055 case ECHILD: return 0; | |
6056 case EINTR: break; | |
6057 default: return -1; | |
6058 } | |
6059 } | |
6060 | |
6061 if (WIFEXITED(status)) { | |
6062 // The child exited normally; get its exit code. | |
6063 return WEXITSTATUS(status); | |
6064 } else if (WIFSIGNALED(status)) { | |
6065 // The child exited because of a signal | |
6066 // The best value to return is 0x80 + signal number, | |
6067 // because that is what all Unix shells do, and because | |
6068 // it allows callers to distinguish between process exit and | |
6069 // process death by signal. | |
6070 return 0x80 + WTERMSIG(status); | |
6071 } else { | |
6072 // Unknown exit code; pass it through | |
6073 return status; | |
6074 } | |
6075 } | |
6076 } | |
1681
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diff
changeset
|
6077 |
126ea7725993
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diff
changeset
|
6078 // is_headless_jre() |
126ea7725993
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1642
diff
changeset
|
6079 // |
4082
36b057451829
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dholmes
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4006
diff
changeset
|
6080 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
1681
126ea7725993
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parents:
1642
diff
changeset
|
6081 // in order to report if we are running in a headless jre |
126ea7725993
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diff
changeset
|
6082 // |
4082
36b057451829
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4006
diff
changeset
|
6083 // Since JDK8 xawt/libmawt.so was moved into the same directory |
36b057451829
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dholmes
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4006
diff
changeset
|
6084 // as libawt.so, and renamed libawt_xawt.so |
36b057451829
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4006
diff
changeset
|
6085 // |
1681
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diff
changeset
|
6086 bool os::is_headless_jre() { |
126ea7725993
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diff
changeset
|
6087 struct stat statbuf; |
126ea7725993
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1642
diff
changeset
|
6088 char buf[MAXPATHLEN]; |
126ea7725993
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diff
changeset
|
6089 char libmawtpath[MAXPATHLEN]; |
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changeset
|
6090 const char *xawtstr = "/xawt/libmawt.so"; |
4082
36b057451829
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|
6091 const char *new_xawtstr = "/libawt_xawt.so"; |
1681
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diff
changeset
|
6092 char *p; |
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diff
changeset
|
6093 |
126ea7725993
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diff
changeset
|
6094 // Get path to libjvm.so |
126ea7725993
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diff
changeset
|
6095 os::jvm_path(buf, sizeof(buf)); |
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diff
changeset
|
6096 |
126ea7725993
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diff
changeset
|
6097 // Get rid of libjvm.so |
126ea7725993
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diff
changeset
|
6098 p = strrchr(buf, '/'); |
126ea7725993
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diff
changeset
|
6099 if (p == NULL) return false; |
126ea7725993
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diff
changeset
|
6100 else *p = '\0'; |
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changeset
|
6101 |
126ea7725993
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diff
changeset
|
6102 // Get rid of client or server |
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diff
changeset
|
6103 p = strrchr(buf, '/'); |
126ea7725993
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diff
changeset
|
6104 if (p == NULL) return false; |
126ea7725993
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1642
diff
changeset
|
6105 else *p = '\0'; |
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diff
changeset
|
6106 |
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diff
changeset
|
6107 // check xawt/libmawt.so |
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diff
changeset
|
6108 strcpy(libmawtpath, buf); |
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diff
changeset
|
6109 strcat(libmawtpath, xawtstr); |
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diff
changeset
|
6110 if (::stat(libmawtpath, &statbuf) == 0) return false; |
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|
6111 |
4082
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diff
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|
6112 // check libawt_xawt.so |
1681
126ea7725993
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diff
changeset
|
6113 strcpy(libmawtpath, buf); |
4082
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|
6114 strcat(libmawtpath, new_xawtstr); |
1681
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diff
changeset
|
6115 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6116 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6117 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6118 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6119 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6120 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6121 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6122 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
|
6123 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6124 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6125 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6126 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6127 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6128 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6129 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6130 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6131 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6132 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6133 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6134 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6135 // A thread to watch the '/dev/mem_notify' device, which will tell us when the OS is running low on memory. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6136 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6137 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6138 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6139 // ctor |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6140 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6141 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6142 assert(memnotify_thread() == NULL, "we can only allocate one MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6143 _fd = fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6144 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6145 if (os::create_thread(this, os::os_thread)) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6146 _memnotify_thread = this; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6147 os::set_priority(this, NearMaxPriority); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6148 os::start_thread(this); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6149 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6150 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6151 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6152 // Where all the work gets done |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6153 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6154 void MemNotifyThread::run() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6155 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6156 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6157 // Set up the select arguments |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6158 fd_set rfds; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6159 if (_fd != -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6160 FD_ZERO(&rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6161 FD_SET(_fd, &rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6162 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6163 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6164 // Now wait for the mem_notify device to wake up |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6165 while (1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6166 // Wait for the mem_notify device to signal us.. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6167 int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6168 if (rc == -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6169 perror("select!\n"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6170 break; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6171 } else if (rc) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6172 //ssize_t free_before = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6173 //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6174 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6175 // The kernel is telling us there is not much memory left... |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6176 // try to do something about that |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6177 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6178 // If we are not already in a GC, try one. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6179 if (!Universe::heap()->is_gc_active()) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6180 Universe::heap()->collect(GCCause::_allocation_failure); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6181 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6182 //ssize_t free_after = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6183 //tty->print ("Post-Notify: Free: %dK\n",free_after/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6184 //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6185 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6186 // We might want to do something like the following if we find the GC's are not helping... |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6187 // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6188 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6189 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6190 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6191 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6192 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6193 // See if the /dev/mem_notify device exists, and if so, start a thread to monitor it. |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6194 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6195 void MemNotifyThread::start() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6196 int fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6197 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6198 if (fd < 0) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6199 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6200 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6201 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6202 if (memnotify_thread() == NULL) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6203 new MemNotifyThread(fd); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6204 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6205 } |
10405 | 6206 |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6207 #endif // JAVASE_EMBEDDED |
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6208 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6209 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6210 /////////////// Unit tests /////////////// |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6211 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6212 #ifndef PRODUCT |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6213 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6214 #define test_log(...) \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6215 do {\ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6216 if (VerboseInternalVMTests) { \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6217 tty->print_cr(__VA_ARGS__); \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6218 tty->flush(); \ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6219 }\ |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6220 } while (false) |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6221 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6222 class TestReserveMemorySpecial : AllStatic { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6223 public: |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6224 static void small_page_write(void* addr, size_t size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6225 size_t page_size = os::vm_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6226 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6227 char* end = (char*)addr + size; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6228 for (char* p = (char*)addr; p < end; p += page_size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6229 *p = 1; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6230 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6231 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6232 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6233 static void test_reserve_memory_special_huge_tlbfs_only(size_t size) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
6234 if (!UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6235 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6236 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6237 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6238 test_log("test_reserve_memory_special_huge_tlbfs_only(" SIZE_FORMAT ")", size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6239 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6240 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_only(size, NULL, false); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6241 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6242 if (addr != NULL) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6243 small_page_write(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6244 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6245 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6246 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6247 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6248 |
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|
6249 static void test_reserve_memory_special_huge_tlbfs_only() { |
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|
6250 if (!UseHugeTLBFS) { |
4c84d351cca9
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|
6251 return; |
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|
6252 } |
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diff
changeset
|
6253 |
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changeset
|
6254 size_t lp = os::large_page_size(); |
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changeset
|
6255 |
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diff
changeset
|
6256 for (size_t size = lp; size <= lp * 10; size += lp) { |
4c84d351cca9
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changeset
|
6257 test_reserve_memory_special_huge_tlbfs_only(size); |
4c84d351cca9
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|
6258 } |
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diff
changeset
|
6259 } |
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diff
changeset
|
6260 |
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changeset
|
6261 static void test_reserve_memory_special_huge_tlbfs_mixed(size_t size, size_t alignment) { |
4c84d351cca9
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|
6262 if (!UseHugeTLBFS) { |
4c84d351cca9
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|
6263 return; |
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diff
changeset
|
6264 } |
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diff
changeset
|
6265 |
4c84d351cca9
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changeset
|
6266 test_log("test_reserve_memory_special_huge_tlbfs_mixed(" SIZE_FORMAT ", " SIZE_FORMAT ")", |
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changeset
|
6267 size, alignment); |
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diff
changeset
|
6268 |
4c84d351cca9
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changeset
|
6269 assert(size >= os::large_page_size(), "Incorrect input to test"); |
4c84d351cca9
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changeset
|
6270 |
4c84d351cca9
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changeset
|
6271 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, NULL, false); |
4c84d351cca9
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changeset
|
6272 |
4c84d351cca9
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diff
changeset
|
6273 if (addr != NULL) { |
4c84d351cca9
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changeset
|
6274 small_page_write(addr, size); |
4c84d351cca9
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diff
changeset
|
6275 |
4c84d351cca9
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diff
changeset
|
6276 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
4c84d351cca9
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changeset
|
6277 } |
4c84d351cca9
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diff
changeset
|
6278 } |
4c84d351cca9
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diff
changeset
|
6279 |
4c84d351cca9
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changeset
|
6280 static void test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(size_t size) { |
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changeset
|
6281 size_t lp = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6282 size_t ag = os::vm_allocation_granularity(); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6283 |
4c84d351cca9
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diff
changeset
|
6284 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6285 test_reserve_memory_special_huge_tlbfs_mixed(size, alignment); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6286 } |
4c84d351cca9
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diff
changeset
|
6287 } |
4c84d351cca9
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diff
changeset
|
6288 |
4c84d351cca9
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diff
changeset
|
6289 static void test_reserve_memory_special_huge_tlbfs_mixed() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6290 size_t lp = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6291 size_t ag = os::vm_allocation_granularity(); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6292 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6293 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6294 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + ag); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6295 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + lp / 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6296 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6297 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + ag); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6298 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 - ag); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6299 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + lp / 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
6300 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6301 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10 + lp / 2); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6302 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6303 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6304 static void test_reserve_memory_special_huge_tlbfs() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6305 if (!UseHugeTLBFS) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6306 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6307 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6308 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6309 test_reserve_memory_special_huge_tlbfs_only(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6310 test_reserve_memory_special_huge_tlbfs_mixed(); |
4c84d351cca9
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diff
changeset
|
6311 } |
4c84d351cca9
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diff
changeset
|
6312 |
4c84d351cca9
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diff
changeset
|
6313 static void test_reserve_memory_special_shm(size_t size, size_t alignment) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6314 if (!UseSHM) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6315 return; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6316 } |
4c84d351cca9
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diff
changeset
|
6317 |
4c84d351cca9
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diff
changeset
|
6318 test_log("test_reserve_memory_special_shm(" SIZE_FORMAT ", " SIZE_FORMAT ")", size, alignment); |
4c84d351cca9
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changeset
|
6319 |
4c84d351cca9
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diff
changeset
|
6320 char* addr = os::Linux::reserve_memory_special_shm(size, alignment, NULL, false); |
4c84d351cca9
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diff
changeset
|
6321 |
4c84d351cca9
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diff
changeset
|
6322 if (addr != NULL) { |
4c84d351cca9
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parents:
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diff
changeset
|
6323 assert(is_ptr_aligned(addr, alignment), "Check"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6324 assert(is_ptr_aligned(addr, os::large_page_size()), "Check"); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6325 |
4c84d351cca9
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diff
changeset
|
6326 small_page_write(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6327 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6328 os::Linux::release_memory_special_shm(addr, size); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6329 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6330 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6331 |
4c84d351cca9
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changeset
|
6332 static void test_reserve_memory_special_shm() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6333 size_t lp = os::large_page_size(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6334 size_t ag = os::vm_allocation_granularity(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6335 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6336 for (size_t size = ag; size < lp * 3; size += ag) { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6337 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
4c84d351cca9
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changeset
|
6338 test_reserve_memory_special_shm(size, alignment); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6339 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6340 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6341 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
6342 |
4c84d351cca9
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diff
changeset
|
6343 static void test() { |
4c84d351cca9
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changeset
|
6344 test_reserve_memory_special_huge_tlbfs(); |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6345 test_reserve_memory_special_shm(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6346 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6347 }; |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6348 |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6349 void TestReserveMemorySpecial_test() { |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6350 TestReserveMemorySpecial::test(); |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
6351 } |
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
6352 |
4c84d351cca9
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changeset
|
6353 #endif |