Mercurial > hg > truffle
annotate src/os/linux/vm/os_linux.cpp @ 11173:6b0fd0964b87
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 31 Jul 2013 11:00:54 +0200 |
parents | 836a62f43af9 59b052799158 |
children | cefad50507d8 |
rev | line source |
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0 | 1 /* |
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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; |
0 | 134 |
135 static jlong initial_time_count=0; | |
136 | |
137 static int clock_tics_per_sec = 100; | |
138 | |
139 // For diagnostics to print a message once. see run_periodic_checks | |
140 static sigset_t check_signal_done; | |
141 static bool check_signals = true;; | |
142 | |
143 static pid_t _initial_pid = 0; | |
144 | |
145 /* Signal number used to suspend/resume a thread */ | |
146 | |
147 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
148 static int SR_signum = SIGUSR2; | |
149 sigset_t SR_sigset; | |
150 | |
242 | 151 /* Used to protect dlsym() calls */ |
152 static pthread_mutex_t dl_mutex; | |
153 | |
10405 | 154 // Declarations |
155 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
156 | |
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157 #ifdef JAVASE_EMBEDDED |
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158 class MemNotifyThread: public Thread { |
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159 friend class VMStructs; |
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160 public: |
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161 virtual void run(); |
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162 |
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163 private: |
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164 static MemNotifyThread* _memnotify_thread; |
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165 int _fd; |
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166 |
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167 public: |
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168 |
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169 // Constructor |
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170 MemNotifyThread(int fd); |
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171 |
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172 // Tester |
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173 bool is_memnotify_thread() const { return true; } |
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174 |
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175 // Printing |
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176 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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177 |
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178 // Returns the single instance of the MemNotifyThread |
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179 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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180 |
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181 // Create and start the single instance of MemNotifyThread |
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182 static void start(); |
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183 }; |
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184 #endif // JAVASE_EMBEDDED |
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185 |
0 | 186 // utility functions |
187 | |
188 static int SR_initialize(); | |
189 | |
190 julong os::available_memory() { | |
191 return Linux::available_memory(); | |
192 } | |
193 | |
194 julong os::Linux::available_memory() { | |
195 // values in struct sysinfo are "unsigned long" | |
196 struct sysinfo si; | |
197 sysinfo(&si); | |
198 | |
199 return (julong)si.freeram * si.mem_unit; | |
200 } | |
201 | |
202 julong os::physical_memory() { | |
203 return Linux::physical_memory(); | |
204 } | |
205 | |
206 //////////////////////////////////////////////////////////////////////////////// | |
207 // environment support | |
208 | |
209 bool os::getenv(const char* name, char* buf, int len) { | |
210 const char* val = ::getenv(name); | |
211 if (val != NULL && strlen(val) < (size_t)len) { | |
212 strcpy(buf, val); | |
213 return true; | |
214 } | |
215 if (len > 0) buf[0] = 0; // return a null string | |
216 return false; | |
217 } | |
218 | |
219 | |
220 // Return true if user is running as root. | |
221 | |
222 bool os::have_special_privileges() { | |
223 static bool init = false; | |
224 static bool privileges = false; | |
225 if (!init) { | |
226 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
227 init = true; | |
228 } | |
229 return privileges; | |
230 } | |
231 | |
232 | |
233 #ifndef SYS_gettid | |
234 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
235 #ifdef __ia64__ | |
236 #define SYS_gettid 1105 | |
237 #elif __i386__ | |
238 #define SYS_gettid 224 | |
239 #elif __amd64__ | |
240 #define SYS_gettid 186 | |
241 #elif __sparc__ | |
242 #define SYS_gettid 143 | |
243 #else | |
244 #error define gettid for the arch | |
245 #endif | |
246 #endif | |
247 | |
248 // Cpu architecture string | |
1010 | 249 #if defined(ZERO) |
250 static char cpu_arch[] = ZERO_LIBARCH; | |
251 #elif defined(IA64) | |
0 | 252 static char cpu_arch[] = "ia64"; |
253 #elif defined(IA32) | |
254 static char cpu_arch[] = "i386"; | |
255 #elif defined(AMD64) | |
256 static char cpu_arch[] = "amd64"; | |
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257 #elif defined(ARM) |
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258 static char cpu_arch[] = "arm"; |
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259 #elif defined(PPC) |
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260 static char cpu_arch[] = "ppc"; |
0 | 261 #elif defined(SPARC) |
262 # ifdef _LP64 | |
263 static char cpu_arch[] = "sparcv9"; | |
264 # else | |
265 static char cpu_arch[] = "sparc"; | |
266 # endif | |
267 #else | |
268 #error Add appropriate cpu_arch setting | |
269 #endif | |
270 | |
271 | |
272 // pid_t gettid() | |
273 // | |
274 // Returns the kernel thread id of the currently running thread. Kernel | |
275 // thread id is used to access /proc. | |
276 // | |
277 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
278 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
279 // | |
280 pid_t os::Linux::gettid() { | |
281 int rslt = syscall(SYS_gettid); | |
282 if (rslt == -1) { | |
283 // old kernel, no NPTL support | |
284 return getpid(); | |
285 } else { | |
286 return (pid_t)rslt; | |
287 } | |
288 } | |
289 | |
290 // Most versions of linux have a bug where the number of processors are | |
291 // determined by looking at the /proc file system. In a chroot environment, | |
292 // the system call returns 1. This causes the VM to act as if it is | |
293 // a single processor and elide locking (see is_MP() call). | |
294 static bool unsafe_chroot_detected = false; | |
199
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295 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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296 "Java may be unstable running multithreaded in a chroot " |
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297 "environment on Linux when /proc filesystem is not mounted."; |
0 | 298 |
299 void os::Linux::initialize_system_info() { | |
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300 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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301 if (processor_count() == 1) { |
0 | 302 pid_t pid = os::Linux::gettid(); |
303 char fname[32]; | |
304 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
305 FILE *fp = fopen(fname, "r"); | |
306 if (fp == NULL) { | |
307 unsafe_chroot_detected = true; | |
308 } else { | |
309 fclose(fp); | |
310 } | |
311 } | |
312 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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313 assert(processor_count() > 0, "linux error"); |
0 | 314 } |
315 | |
316 void os::init_system_properties_values() { | |
317 // char arch[12]; | |
318 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
319 | |
320 // The next steps are taken in the product version: | |
321 // | |
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322 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 323 // This library should be located at: |
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324 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 325 // |
326 // If "/jre/lib/" appears at the right place in the path, then we | |
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327 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 328 // |
329 // Otherwise exit with message: "Could not create the Java virtual machine." | |
330 // | |
331 // The following extra steps are taken in the debugging version: | |
332 // | |
333 // If "/jre/lib/" does NOT appear at the right place in the path | |
334 // instead of exit check for $JAVA_HOME environment variable. | |
335 // | |
336 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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337 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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338 // it looks like libjvm.so is installed there |
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339 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 340 // |
341 // Otherwise exit. | |
342 // | |
343 // Important note: if the location of libjvm.so changes this | |
344 // code needs to be changed accordingly. | |
345 | |
346 // The next few definitions allow the code to be verbatim: | |
6197 | 347 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
0 | 348 #define getenv(n) ::getenv(n) |
349 | |
350 /* | |
351 * See ld(1): | |
352 * The linker uses the following search paths to locate required | |
353 * shared libraries: | |
354 * 1: ... | |
355 * ... | |
356 * 7: The default directories, normally /lib and /usr/lib. | |
357 */ | |
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358 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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359 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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360 #else |
0 | 361 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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362 #endif |
0 | 363 |
364 #define EXTENSIONS_DIR "/lib/ext" | |
365 #define ENDORSED_DIR "/lib/endorsed" | |
366 #define REG_DIR "/usr/java/packages" | |
367 | |
368 { | |
369 /* sysclasspath, java_home, dll_dir */ | |
370 { | |
371 char *home_path; | |
372 char *dll_path; | |
373 char *pslash; | |
374 char buf[MAXPATHLEN]; | |
375 os::jvm_path(buf, sizeof(buf)); | |
376 | |
377 // Found the full path to libjvm.so. | |
378 // Now cut the path to <java_home>/jre if we can. | |
379 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
380 pslash = strrchr(buf, '/'); | |
381 if (pslash != NULL) | |
382 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
383 dll_path = malloc(strlen(buf) + 1); | |
384 if (dll_path == NULL) | |
385 return; | |
386 strcpy(dll_path, buf); | |
387 Arguments::set_dll_dir(dll_path); | |
388 | |
389 if (pslash != NULL) { | |
390 pslash = strrchr(buf, '/'); | |
391 if (pslash != NULL) { | |
392 *pslash = '\0'; /* get rid of /<arch> */ | |
393 pslash = strrchr(buf, '/'); | |
394 if (pslash != NULL) | |
395 *pslash = '\0'; /* get rid of /lib */ | |
396 } | |
397 } | |
398 | |
399 home_path = malloc(strlen(buf) + 1); | |
400 if (home_path == NULL) | |
401 return; | |
402 strcpy(home_path, buf); | |
403 Arguments::set_java_home(home_path); | |
404 | |
405 if (!set_boot_path('/', ':')) | |
406 return; | |
407 } | |
408 | |
409 /* | |
410 * Where to look for native libraries | |
411 * | |
412 * Note: Due to a legacy implementation, most of the library path | |
413 * is set in the launcher. This was to accomodate linking restrictions | |
414 * on legacy Linux implementations (which are no longer supported). | |
415 * Eventually, all the library path setting will be done here. | |
416 * | |
417 * However, to prevent the proliferation of improperly built native | |
418 * libraries, the new path component /usr/java/packages is added here. | |
419 * Eventually, all the library path setting will be done here. | |
420 */ | |
421 { | |
422 char *ld_library_path; | |
423 | |
424 /* | |
425 * Construct the invariant part of ld_library_path. Note that the | |
426 * space for the colon and the trailing null are provided by the | |
427 * nulls included by the sizeof operator (so actually we allocate | |
428 * a byte more than necessary). | |
429 */ | |
430 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + | |
431 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
432 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
433 | |
434 /* | |
435 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
436 * should always exist (until the legacy problem cited above is | |
437 * addressed). | |
438 */ | |
439 char *v = getenv("LD_LIBRARY_PATH"); | |
440 if (v != NULL) { | |
441 char *t = ld_library_path; | |
442 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
443 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
444 sprintf(ld_library_path, "%s:%s", v, t); | |
445 } | |
446 Arguments::set_library_path(ld_library_path); | |
447 } | |
448 | |
449 /* | |
450 * Extensions directories. | |
451 * | |
452 * Note that the space for the colon and the trailing null are provided | |
453 * by the nulls included by the sizeof operator (so actually one byte more | |
454 * than necessary is allocated). | |
455 */ | |
456 { | |
457 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
458 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
459 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
460 Arguments::get_java_home()); | |
461 Arguments::set_ext_dirs(buf); | |
462 } | |
463 | |
464 /* Endorsed standards default directory. */ | |
465 { | |
466 char * buf; | |
467 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
468 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
469 Arguments::set_endorsed_dirs(buf); | |
470 } | |
471 } | |
472 | |
473 #undef malloc | |
474 #undef getenv | |
475 #undef EXTENSIONS_DIR | |
476 #undef ENDORSED_DIR | |
477 | |
478 // Done | |
479 return; | |
480 } | |
481 | |
482 //////////////////////////////////////////////////////////////////////////////// | |
483 // breakpoint support | |
484 | |
485 void os::breakpoint() { | |
486 BREAKPOINT; | |
487 } | |
488 | |
489 extern "C" void breakpoint() { | |
490 // use debugger to set breakpoint here | |
491 } | |
492 | |
493 //////////////////////////////////////////////////////////////////////////////// | |
494 // signal support | |
495 | |
496 debug_only(static bool signal_sets_initialized = false); | |
497 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
498 | |
499 bool os::Linux::is_sig_ignored(int sig) { | |
500 struct sigaction oact; | |
501 sigaction(sig, (struct sigaction*)NULL, &oact); | |
502 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
503 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
504 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
505 return true; | |
506 else | |
507 return false; | |
508 } | |
509 | |
510 void os::Linux::signal_sets_init() { | |
511 // Should also have an assertion stating we are still single-threaded. | |
512 assert(!signal_sets_initialized, "Already initialized"); | |
513 // Fill in signals that are necessarily unblocked for all threads in | |
514 // the VM. Currently, we unblock the following signals: | |
515 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
516 // by -Xrs (=ReduceSignalUsage)); | |
517 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
518 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
519 // the dispositions or masks wrt these signals. | |
520 // Programs embedding the VM that want to use the above signals for their | |
521 // own purposes must, at this time, use the "-Xrs" option to prevent | |
522 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
523 // (See bug 4345157, and other related bugs). | |
524 // In reality, though, unblocking these signals is really a nop, since | |
525 // these signals are not blocked by default. | |
526 sigemptyset(&unblocked_sigs); | |
527 sigemptyset(&allowdebug_blocked_sigs); | |
528 sigaddset(&unblocked_sigs, SIGILL); | |
529 sigaddset(&unblocked_sigs, SIGSEGV); | |
530 sigaddset(&unblocked_sigs, SIGBUS); | |
531 sigaddset(&unblocked_sigs, SIGFPE); | |
532 sigaddset(&unblocked_sigs, SR_signum); | |
533 | |
534 if (!ReduceSignalUsage) { | |
535 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
536 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
537 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
538 } | |
539 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
540 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
541 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
542 } | |
543 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
544 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
545 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
546 } | |
547 } | |
548 // Fill in signals that are blocked by all but the VM thread. | |
549 sigemptyset(&vm_sigs); | |
550 if (!ReduceSignalUsage) | |
551 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
552 debug_only(signal_sets_initialized = true); | |
553 | |
554 } | |
555 | |
556 // These are signals that are unblocked while a thread is running Java. | |
557 // (For some reason, they get blocked by default.) | |
558 sigset_t* os::Linux::unblocked_signals() { | |
559 assert(signal_sets_initialized, "Not initialized"); | |
560 return &unblocked_sigs; | |
561 } | |
562 | |
563 // These are the signals that are blocked while a (non-VM) thread is | |
564 // running Java. Only the VM thread handles these signals. | |
565 sigset_t* os::Linux::vm_signals() { | |
566 assert(signal_sets_initialized, "Not initialized"); | |
567 return &vm_sigs; | |
568 } | |
569 | |
570 // These are signals that are blocked during cond_wait to allow debugger in | |
571 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
572 assert(signal_sets_initialized, "Not initialized"); | |
573 return &allowdebug_blocked_sigs; | |
574 } | |
575 | |
576 void os::Linux::hotspot_sigmask(Thread* thread) { | |
577 | |
578 //Save caller's signal mask before setting VM signal mask | |
579 sigset_t caller_sigmask; | |
580 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
581 | |
582 OSThread* osthread = thread->osthread(); | |
583 osthread->set_caller_sigmask(caller_sigmask); | |
584 | |
585 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
586 | |
587 if (!ReduceSignalUsage) { | |
588 if (thread->is_VM_thread()) { | |
589 // Only the VM thread handles BREAK_SIGNAL ... | |
590 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
591 } else { | |
592 // ... all other threads block BREAK_SIGNAL | |
593 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
594 } | |
595 } | |
596 } | |
597 | |
598 ////////////////////////////////////////////////////////////////////////////// | |
599 // detecting pthread library | |
600 | |
601 void os::Linux::libpthread_init() { | |
602 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
603 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
604 // generic name for earlier versions. | |
605 // Define macros here so we can build HotSpot on old systems. | |
606 # ifndef _CS_GNU_LIBC_VERSION | |
607 # define _CS_GNU_LIBC_VERSION 2 | |
608 # endif | |
609 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
610 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
611 # endif | |
612 | |
613 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
614 if (n > 0) { | |
6197 | 615 char *str = (char *)malloc(n, mtInternal); |
0 | 616 confstr(_CS_GNU_LIBC_VERSION, str, n); |
617 os::Linux::set_glibc_version(str); | |
618 } else { | |
619 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
620 static char _gnu_libc_version[32]; | |
621 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
622 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
623 os::Linux::set_glibc_version(_gnu_libc_version); | |
624 } | |
625 | |
626 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
627 if (n > 0) { | |
6197 | 628 char *str = (char *)malloc(n, mtInternal); |
0 | 629 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
630 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
631 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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632 // is the case. LinuxThreads has a hard limit on max number of threads. |
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633 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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634 // On the other hand, NPTL does not have such a limit, sysconf() |
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635 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 636 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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637 strstr(str, "NPTL") && |
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638 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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639 free(str); |
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640 os::Linux::set_libpthread_version("linuxthreads"); |
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641 } else { |
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642 os::Linux::set_libpthread_version(str); |
0 | 643 } |
644 } else { | |
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645 // glibc before 2.3.2 only has LinuxThreads. |
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646 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 647 } |
648 | |
649 if (strstr(libpthread_version(), "NPTL")) { | |
650 os::Linux::set_is_NPTL(); | |
651 } else { | |
652 os::Linux::set_is_LinuxThreads(); | |
653 } | |
654 | |
655 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
656 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
657 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
658 os::Linux::set_is_floating_stack(); | |
659 } | |
660 } | |
661 | |
662 ///////////////////////////////////////////////////////////////////////////// | |
663 // thread stack | |
664 | |
665 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
666 // to the stack guard, caller should block all signals. | |
667 // | |
668 // MAP_GROWSDOWN: | |
669 // A special mmap() flag that is used to implement thread stacks. It tells | |
670 // kernel that the memory region should extend downwards when needed. This | |
671 // allows early versions of LinuxThreads to only mmap the first few pages | |
672 // when creating a new thread. Linux kernel will automatically expand thread | |
673 // stack as needed (on page faults). | |
674 // | |
675 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
676 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
677 // region, it's hard to tell if the fault is due to a legitimate stack | |
678 // access or because of reading/writing non-exist memory (e.g. buffer | |
679 // overrun). As a rule, if the fault happens below current stack pointer, | |
680 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
681 // application (see Linux kernel fault.c). | |
682 // | |
683 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
684 // stack overflow detection. | |
685 // | |
686 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
687 // not use this flag. However, the stack of initial thread is not created | |
688 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
689 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
690 // and then attach the thread to JVM. | |
691 // | |
692 // To get around the problem and allow stack banging on Linux, we need to | |
693 // manually expand thread stack after receiving the SIGSEGV. | |
694 // | |
695 // There are two ways to expand thread stack to address "bottom", we used | |
696 // both of them in JVM before 1.5: | |
697 // 1. adjust stack pointer first so that it is below "bottom", and then | |
698 // touch "bottom" | |
699 // 2. mmap() the page in question | |
700 // | |
701 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
702 // if current sp is already near the lower end of page 101, and we need to | |
703 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
704 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
705 // That will destroy the mmap() frame and cause VM to crash. | |
706 // | |
707 // The following code works by adjusting sp first, then accessing the "bottom" | |
708 // page to force a page fault. Linux kernel will then automatically expand the | |
709 // stack mapping. | |
710 // | |
711 // _expand_stack_to() assumes its frame size is less than page size, which | |
712 // should always be true if the function is not inlined. | |
713 | |
714 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
715 #define NOINLINE | |
716 #else | |
717 #define NOINLINE __attribute__ ((noinline)) | |
718 #endif | |
719 | |
720 static void _expand_stack_to(address bottom) NOINLINE; | |
721 | |
722 static void _expand_stack_to(address bottom) { | |
723 address sp; | |
724 size_t size; | |
725 volatile char *p; | |
726 | |
727 // Adjust bottom to point to the largest address within the same page, it | |
728 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
729 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
730 bottom += os::Linux::page_size() - 1; | |
731 | |
732 // sp might be slightly above current stack pointer; if that's the case, we | |
733 // will alloca() a little more space than necessary, which is OK. Don't use | |
734 // os::current_stack_pointer(), as its result can be slightly below current | |
735 // stack pointer, causing us to not alloca enough to reach "bottom". | |
736 sp = (address)&sp; | |
737 | |
738 if (sp > bottom) { | |
739 size = sp - bottom; | |
740 p = (volatile char *)alloca(size); | |
741 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
742 p[0] = '\0'; | |
743 } | |
744 } | |
745 | |
746 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
747 assert(t!=NULL, "just checking"); | |
748 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
749 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
750 | |
751 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
752 sigset_t mask_all, old_sigset; | |
753 sigfillset(&mask_all); | |
754 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
755 _expand_stack_to(addr); | |
756 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
757 return true; | |
758 } | |
759 return false; | |
760 } | |
761 | |
762 ////////////////////////////////////////////////////////////////////////////// | |
763 // create new thread | |
764 | |
765 static address highest_vm_reserved_address(); | |
766 | |
767 // check if it's safe to start a new thread | |
768 static bool _thread_safety_check(Thread* thread) { | |
769 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
770 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
771 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
772 // allocated (MAP_FIXED) from high address space. Every thread stack | |
773 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
774 // it to other values if they rebuild LinuxThreads). | |
775 // | |
776 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
777 // the memory region has already been mmap'ed. That means if we have too | |
778 // many threads and/or very large heap, eventually thread stack will | |
779 // collide with heap. | |
780 // | |
781 // Here we try to prevent heap/stack collision by comparing current | |
782 // stack bottom with the highest address that has been mmap'ed by JVM | |
783 // plus a safety margin for memory maps created by native code. | |
784 // | |
785 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
786 // | |
787 if (ThreadSafetyMargin > 0) { | |
788 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
789 | |
790 // not safe if our stack extends below the safety margin | |
791 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
792 } else { | |
793 return true; | |
794 } | |
795 } else { | |
796 // Floating stack LinuxThreads or NPTL: | |
797 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
798 // there's not enough space left, pthread_create() will fail. If we come | |
799 // here, that means enough space has been reserved for stack. | |
800 return true; | |
801 } | |
802 } | |
803 | |
804 // Thread start routine for all newly created threads | |
805 static void *java_start(Thread *thread) { | |
806 // Try to randomize the cache line index of hot stack frames. | |
807 // This helps when threads of the same stack traces evict each other's | |
808 // cache lines. The threads can be either from the same JVM instance, or | |
809 // from different JVM instances. The benefit is especially true for | |
810 // processors with hyperthreading technology. | |
811 static int counter = 0; | |
812 int pid = os::current_process_id(); | |
813 alloca(((pid ^ counter++) & 7) * 128); | |
814 | |
815 ThreadLocalStorage::set_thread(thread); | |
816 | |
817 OSThread* osthread = thread->osthread(); | |
818 Monitor* sync = osthread->startThread_lock(); | |
819 | |
820 // non floating stack LinuxThreads needs extra check, see above | |
821 if (!_thread_safety_check(thread)) { | |
822 // notify parent thread | |
823 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
824 osthread->set_state(ZOMBIE); | |
825 sync->notify_all(); | |
826 return NULL; | |
827 } | |
828 | |
829 // thread_id is kernel thread id (similar to Solaris LWP id) | |
830 osthread->set_thread_id(os::Linux::gettid()); | |
831 | |
832 if (UseNUMA) { | |
833 int lgrp_id = os::numa_get_group_id(); | |
834 if (lgrp_id != -1) { | |
835 thread->set_lgrp_id(lgrp_id); | |
836 } | |
837 } | |
838 // initialize signal mask for this thread | |
839 os::Linux::hotspot_sigmask(thread); | |
840 | |
841 // initialize floating point control register | |
842 os::Linux::init_thread_fpu_state(); | |
843 | |
844 // handshaking with parent thread | |
845 { | |
846 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
847 | |
848 // notify parent thread | |
849 osthread->set_state(INITIALIZED); | |
850 sync->notify_all(); | |
851 | |
852 // wait until os::start_thread() | |
853 while (osthread->get_state() == INITIALIZED) { | |
854 sync->wait(Mutex::_no_safepoint_check_flag); | |
855 } | |
856 } | |
857 | |
858 // call one more level start routine | |
859 thread->run(); | |
860 | |
861 return 0; | |
862 } | |
863 | |
864 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
865 assert(thread->osthread() == NULL, "caller responsible"); | |
866 | |
867 // Allocate the OSThread object | |
868 OSThread* osthread = new OSThread(NULL, NULL); | |
869 if (osthread == NULL) { | |
870 return false; | |
871 } | |
872 | |
873 // set the correct thread state | |
874 osthread->set_thread_type(thr_type); | |
875 | |
876 // Initial state is ALLOCATED but not INITIALIZED | |
877 osthread->set_state(ALLOCATED); | |
878 | |
879 thread->set_osthread(osthread); | |
880 | |
881 // init thread attributes | |
882 pthread_attr_t attr; | |
883 pthread_attr_init(&attr); | |
884 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
885 | |
886 // stack size | |
887 if (os::Linux::supports_variable_stack_size()) { | |
888 // calculate stack size if it's not specified by caller | |
889 if (stack_size == 0) { | |
890 stack_size = os::Linux::default_stack_size(thr_type); | |
891 | |
892 switch (thr_type) { | |
893 case os::java_thread: | |
1867
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894 // Java threads use ThreadStackSize which default value can be |
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895 // changed with the flag -Xss |
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896 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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897 stack_size = JavaThread::stack_size_at_create(); |
0 | 898 break; |
899 case os::compiler_thread: | |
900 if (CompilerThreadStackSize > 0) { | |
901 stack_size = (size_t)(CompilerThreadStackSize * K); | |
902 break; | |
903 } // else fall through: | |
904 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
905 case os::vm_thread: | |
906 case os::pgc_thread: | |
907 case os::cgc_thread: | |
908 case os::watcher_thread: | |
909 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
910 break; | |
911 } | |
912 } | |
913 | |
914 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
915 pthread_attr_setstacksize(&attr, stack_size); | |
916 } else { | |
917 // let pthread_create() pick the default value. | |
918 } | |
919 | |
920 // glibc guard page | |
921 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
922 | |
923 ThreadState state; | |
924 | |
925 { | |
926 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
927 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
928 if (lock) { | |
929 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
930 } | |
931 | |
932 pthread_t tid; | |
933 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
934 | |
935 pthread_attr_destroy(&attr); | |
936 | |
937 if (ret != 0) { | |
938 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
939 perror("pthread_create()"); | |
940 } | |
941 // Need to clean up stuff we've allocated so far | |
942 thread->set_osthread(NULL); | |
943 delete osthread; | |
944 if (lock) os::Linux::createThread_lock()->unlock(); | |
945 return false; | |
946 } | |
947 | |
948 // Store pthread info into the OSThread | |
949 osthread->set_pthread_id(tid); | |
950 | |
951 // Wait until child thread is either initialized or aborted | |
952 { | |
953 Monitor* sync_with_child = osthread->startThread_lock(); | |
954 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
955 while ((state = osthread->get_state()) == ALLOCATED) { | |
956 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
957 } | |
958 } | |
959 | |
960 if (lock) { | |
961 os::Linux::createThread_lock()->unlock(); | |
962 } | |
963 } | |
964 | |
965 // Aborted due to thread limit being reached | |
966 if (state == ZOMBIE) { | |
967 thread->set_osthread(NULL); | |
968 delete osthread; | |
969 return false; | |
970 } | |
971 | |
972 // The thread is returned suspended (in state INITIALIZED), | |
973 // and is started higher up in the call chain | |
974 assert(state == INITIALIZED, "race condition"); | |
975 return true; | |
976 } | |
977 | |
978 ///////////////////////////////////////////////////////////////////////////// | |
979 // attach existing thread | |
980 | |
981 // bootstrap the main thread | |
982 bool os::create_main_thread(JavaThread* thread) { | |
983 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
984 return create_attached_thread(thread); | |
985 } | |
986 | |
987 bool os::create_attached_thread(JavaThread* thread) { | |
988 #ifdef ASSERT | |
989 thread->verify_not_published(); | |
990 #endif | |
991 | |
992 // Allocate the OSThread object | |
993 OSThread* osthread = new OSThread(NULL, NULL); | |
994 | |
995 if (osthread == NULL) { | |
996 return false; | |
997 } | |
998 | |
999 // Store pthread info into the OSThread | |
1000 osthread->set_thread_id(os::Linux::gettid()); | |
1001 osthread->set_pthread_id(::pthread_self()); | |
1002 | |
1003 // initialize floating point control register | |
1004 os::Linux::init_thread_fpu_state(); | |
1005 | |
1006 // Initial thread state is RUNNABLE | |
1007 osthread->set_state(RUNNABLE); | |
1008 | |
1009 thread->set_osthread(osthread); | |
1010 | |
1011 if (UseNUMA) { | |
1012 int lgrp_id = os::numa_get_group_id(); | |
1013 if (lgrp_id != -1) { | |
1014 thread->set_lgrp_id(lgrp_id); | |
1015 } | |
1016 } | |
1017 | |
1018 if (os::Linux::is_initial_thread()) { | |
1019 // If current thread is initial thread, its stack is mapped on demand, | |
1020 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
1021 // the entire stack region to avoid SEGV in stack banging. | |
1022 // It is also useful to get around the heap-stack-gap problem on SuSE | |
1023 // kernel (see 4821821 for details). We first expand stack to the top | |
1024 // of yellow zone, then enable stack yellow zone (order is significant, | |
1025 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
1026 // is no gap between the last two virtual memory regions. | |
1027 | |
1028 JavaThread *jt = (JavaThread *)thread; | |
1029 address addr = jt->stack_yellow_zone_base(); | |
1030 assert(addr != NULL, "initialization problem?"); | |
1031 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
1032 | |
1033 osthread->set_expanding_stack(); | |
1034 os::Linux::manually_expand_stack(jt, addr); | |
1035 osthread->clear_expanding_stack(); | |
1036 } | |
1037 | |
1038 // initialize signal mask for this thread | |
1039 // and save the caller's signal mask | |
1040 os::Linux::hotspot_sigmask(thread); | |
1041 | |
1042 return true; | |
1043 } | |
1044 | |
1045 void os::pd_start_thread(Thread* thread) { | |
1046 OSThread * osthread = thread->osthread(); | |
1047 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
1048 Monitor* sync_with_child = osthread->startThread_lock(); | |
1049 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
1050 sync_with_child->notify(); | |
1051 } | |
1052 | |
1053 // Free Linux resources related to the OSThread | |
1054 void os::free_thread(OSThread* osthread) { | |
1055 assert(osthread != NULL, "osthread not set"); | |
1056 | |
1057 if (Thread::current()->osthread() == osthread) { | |
1058 // Restore caller's signal mask | |
1059 sigset_t sigmask = osthread->caller_sigmask(); | |
1060 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1061 } | |
1062 | |
1063 delete osthread; | |
1064 } | |
1065 | |
1066 ////////////////////////////////////////////////////////////////////////////// | |
1067 // thread local storage | |
1068 | |
1069 int os::allocate_thread_local_storage() { | |
1070 pthread_key_t key; | |
1071 int rslt = pthread_key_create(&key, NULL); | |
1072 assert(rslt == 0, "cannot allocate thread local storage"); | |
1073 return (int)key; | |
1074 } | |
1075 | |
1076 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1077 // on VM exit. | |
1078 void os::free_thread_local_storage(int index) { | |
1079 int rslt = pthread_key_delete((pthread_key_t)index); | |
1080 assert(rslt == 0, "invalid index"); | |
1081 } | |
1082 | |
1083 void os::thread_local_storage_at_put(int index, void* value) { | |
1084 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1085 assert(rslt == 0, "pthread_setspecific failed"); | |
1086 } | |
1087 | |
1088 extern "C" Thread* get_thread() { | |
1089 return ThreadLocalStorage::thread(); | |
1090 } | |
1091 | |
1092 ////////////////////////////////////////////////////////////////////////////// | |
1093 // initial thread | |
1094 | |
1095 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1096 bool os::Linux::is_initial_thread(void) { | |
1097 char dummy; | |
1098 // If called before init complete, thread stack bottom will be null. | |
1099 // Can be called if fatal error occurs before initialization. | |
1100 if (initial_thread_stack_bottom() == NULL) return false; | |
1101 assert(initial_thread_stack_bottom() != NULL && | |
1102 initial_thread_stack_size() != 0, | |
1103 "os::init did not locate initial thread's stack region"); | |
1104 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1105 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1106 return true; | |
1107 else return false; | |
1108 } | |
1109 | |
1110 // Find the virtual memory area that contains addr | |
1111 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1112 FILE *fp = fopen("/proc/self/maps", "r"); | |
1113 if (fp) { | |
1114 address low, high; | |
1115 while (!feof(fp)) { | |
1116 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1117 if (low <= addr && addr < high) { | |
1118 if (vma_low) *vma_low = low; | |
1119 if (vma_high) *vma_high = high; | |
1120 fclose (fp); | |
1121 return true; | |
1122 } | |
1123 } | |
1124 for (;;) { | |
1125 int ch = fgetc(fp); | |
1126 if (ch == EOF || ch == (int)'\n') break; | |
1127 } | |
1128 } | |
1129 fclose(fp); | |
1130 } | |
1131 return false; | |
1132 } | |
1133 | |
1134 // Locate initial thread stack. This special handling of initial thread stack | |
1135 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1136 // bogus value for initial thread. | |
1137 void os::Linux::capture_initial_stack(size_t max_size) { | |
1138 // stack size is the easy part, get it from RLIMIT_STACK | |
1139 size_t stack_size; | |
1140 struct rlimit rlim; | |
1141 getrlimit(RLIMIT_STACK, &rlim); | |
1142 stack_size = rlim.rlim_cur; | |
1143 | |
1144 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1145 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1146 // so we won't install guard page on ld.so's data section. | |
1147 stack_size -= 2 * page_size(); | |
1148 | |
1149 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1150 // 7.1, in both cases we will get 2G in return value. | |
1151 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1152 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1153 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1154 // in case other parts in glibc still assumes 2M max stack size. | |
1155 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1156 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1157 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1158 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1159 // Try to figure out where the stack base (top) is. This is harder. |
1160 // | |
1161 // When an application is started, glibc saves the initial stack pointer in | |
1162 // a global variable "__libc_stack_end", which is then used by system | |
1163 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1164 // variable is available since the very early days. However, because it is | |
1165 // a private interface, it could disappear in the future. | |
1166 // | |
1167 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1168 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1169 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1170 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1171 // /proc/<pid>/stat could change in the future (though unlikely). | |
1172 // | |
1173 // We try __libc_stack_end first. If that doesn't work, look for | |
1174 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1175 // as a hint, which should work well in most cases. | |
1176 | |
1177 uintptr_t stack_start; | |
1178 | |
1179 // try __libc_stack_end first | |
1180 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1181 if (p && *p) { | |
1182 stack_start = *p; | |
1183 } else { | |
1184 // see if we can get the start_stack field from /proc/self/stat | |
1185 FILE *fp; | |
1186 int pid; | |
1187 char state; | |
1188 int ppid; | |
1189 int pgrp; | |
1190 int session; | |
1191 int nr; | |
1192 int tpgrp; | |
1193 unsigned long flags; | |
1194 unsigned long minflt; | |
1195 unsigned long cminflt; | |
1196 unsigned long majflt; | |
1197 unsigned long cmajflt; | |
1198 unsigned long utime; | |
1199 unsigned long stime; | |
1200 long cutime; | |
1201 long cstime; | |
1202 long prio; | |
1203 long nice; | |
1204 long junk; | |
1205 long it_real; | |
1206 uintptr_t start; | |
1207 uintptr_t vsize; | |
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1208 intptr_t rss; |
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1209 uintptr_t rsslim; |
0 | 1210 uintptr_t scodes; |
1211 uintptr_t ecode; | |
1212 int i; | |
1213 | |
1214 // Figure what the primordial thread stack base is. Code is inspired | |
1215 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1216 // followed by command name surrounded by parentheses, state, etc. | |
1217 char stat[2048]; | |
1218 int statlen; | |
1219 | |
1220 fp = fopen("/proc/self/stat", "r"); | |
1221 if (fp) { | |
1222 statlen = fread(stat, 1, 2047, fp); | |
1223 stat[statlen] = '\0'; | |
1224 fclose(fp); | |
1225 | |
1226 // Skip pid and the command string. Note that we could be dealing with | |
1227 // weird command names, e.g. user could decide to rename java launcher | |
1228 // to "java 1.4.2 :)", then the stat file would look like | |
1229 // 1234 (java 1.4.2 :)) R ... ... | |
1230 // We don't really need to know the command string, just find the last | |
1231 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1232 char * s = strrchr(stat, ')'); | |
1233 | |
1234 i = 0; | |
1235 if (s) { | |
1236 // Skip blank chars | |
1237 do s++; while (isspace(*s)); | |
1238 | |
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1239 #define _UFM UINTX_FORMAT |
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1240 #define _DFM INTX_FORMAT |
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1241 |
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1242 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1243 /* 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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1244 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 | 1245 &state, /* 3 %c */ |
1246 &ppid, /* 4 %d */ | |
1247 &pgrp, /* 5 %d */ | |
1248 &session, /* 6 %d */ | |
1249 &nr, /* 7 %d */ | |
1250 &tpgrp, /* 8 %d */ | |
1251 &flags, /* 9 %lu */ | |
1252 &minflt, /* 10 %lu */ | |
1253 &cminflt, /* 11 %lu */ | |
1254 &majflt, /* 12 %lu */ | |
1255 &cmajflt, /* 13 %lu */ | |
1256 &utime, /* 14 %lu */ | |
1257 &stime, /* 15 %lu */ | |
1258 &cutime, /* 16 %ld */ | |
1259 &cstime, /* 17 %ld */ | |
1260 &prio, /* 18 %ld */ | |
1261 &nice, /* 19 %ld */ | |
1262 &junk, /* 20 %ld */ | |
1263 &it_real, /* 21 %ld */ | |
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1264 &start, /* 22 UINTX_FORMAT */ |
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1265 &vsize, /* 23 UINTX_FORMAT */ |
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1266 &rss, /* 24 INTX_FORMAT */ |
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1267 &rsslim, /* 25 UINTX_FORMAT */ |
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1268 &scodes, /* 26 UINTX_FORMAT */ |
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1269 &ecode, /* 27 UINTX_FORMAT */ |
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1270 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1271 } |
1272 | |
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1273 #undef _UFM |
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1274 #undef _DFM |
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1275 |
0 | 1276 if (i != 28 - 2) { |
1277 assert(false, "Bad conversion from /proc/self/stat"); | |
1278 // product mode - assume we are the initial thread, good luck in the | |
1279 // embedded case. | |
1280 warning("Can't detect initial thread stack location - bad conversion"); | |
1281 stack_start = (uintptr_t) &rlim; | |
1282 } | |
1283 } else { | |
1284 // For some reason we can't open /proc/self/stat (for example, running on | |
1285 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1286 // most cases, so don't abort: | |
1287 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1288 stack_start = (uintptr_t) &rlim; | |
1289 } | |
1290 } | |
1291 | |
1292 // Now we have a pointer (stack_start) very close to the stack top, the | |
1293 // next thing to do is to figure out the exact location of stack top. We | |
1294 // can find out the virtual memory area that contains stack_start by | |
1295 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1296 // and its upper limit is the real stack top. (again, this would fail if | |
1297 // running inside chroot, because /proc may not exist.) | |
1298 | |
1299 uintptr_t stack_top; | |
1300 address low, high; | |
1301 if (find_vma((address)stack_start, &low, &high)) { | |
1302 // success, "high" is the true stack top. (ignore "low", because initial | |
1303 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1304 stack_top = (uintptr_t)high; | |
1305 } else { | |
1306 // failed, likely because /proc/self/maps does not exist | |
1307 warning("Can't detect initial thread stack location - find_vma failed"); | |
1308 // best effort: stack_start is normally within a few pages below the real | |
1309 // stack top, use it as stack top, and reduce stack size so we won't put | |
1310 // guard page outside stack. | |
1311 stack_top = stack_start; | |
1312 stack_size -= 16 * page_size(); | |
1313 } | |
1314 | |
1315 // stack_top could be partially down the page so align it | |
1316 stack_top = align_size_up(stack_top, page_size()); | |
1317 | |
1318 if (max_size && stack_size > max_size) { | |
1319 _initial_thread_stack_size = max_size; | |
1320 } else { | |
1321 _initial_thread_stack_size = stack_size; | |
1322 } | |
1323 | |
1324 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1325 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1326 } | |
1327 | |
1328 //////////////////////////////////////////////////////////////////////////////// | |
1329 // time support | |
1330 | |
1331 // Time since start-up in seconds to a fine granularity. | |
1332 // Used by VMSelfDestructTimer and the MemProfiler. | |
1333 double os::elapsedTime() { | |
1334 | |
1335 return (double)(os::elapsed_counter()) * 0.000001; | |
1336 } | |
1337 | |
1338 jlong os::elapsed_counter() { | |
1339 timeval time; | |
1340 int status = gettimeofday(&time, NULL); | |
1341 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
1342 } | |
1343 | |
1344 jlong os::elapsed_frequency() { | |
1345 return (1000 * 1000); | |
1346 } | |
1347 | |
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1348 bool os::supports_vtime() { return true; } |
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1349 bool os::enable_vtime() { return false; } |
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1350 bool os::vtime_enabled() { return false; } |
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1351 |
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1352 double os::elapsedVTime() { |
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1353 struct rusage usage; |
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1354 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1355 if (retval == 0) { |
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1356 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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1357 } else { |
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1358 // better than nothing, but not much |
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1359 return elapsedTime(); |
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1360 } |
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1361 } |
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1362 |
61 | 1363 jlong os::javaTimeMillis() { |
0 | 1364 timeval time; |
1365 int status = gettimeofday(&time, NULL); | |
1366 assert(status != -1, "linux error"); | |
1367 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1368 } | |
1369 | |
1370 #ifndef CLOCK_MONOTONIC | |
1371 #define CLOCK_MONOTONIC (1) | |
1372 #endif | |
1373 | |
1374 void os::Linux::clock_init() { | |
1375 // we do dlopen's in this particular order due to bug in linux | |
1376 // dynamical loader (see 6348968) leading to crash on exit | |
1377 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1378 if (handle == NULL) { | |
1379 handle = dlopen("librt.so", RTLD_LAZY); | |
1380 } | |
1381 | |
1382 if (handle) { | |
1383 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1384 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1385 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1386 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1387 if (clock_getres_func && clock_gettime_func) { | |
1388 // See if monotonic clock is supported by the kernel. Note that some | |
1389 // early implementations simply return kernel jiffies (updated every | |
1390 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1391 // for nano time (though the monotonic property is still nice to have). | |
1392 // It's fixed in newer kernels, however clock_getres() still returns | |
1393 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1394 // resolution for now. Hopefully as people move to new kernels, this | |
1395 // won't be a problem. | |
1396 struct timespec res; | |
1397 struct timespec tp; | |
1398 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1399 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1400 // yes, monotonic clock is supported | |
1401 _clock_gettime = clock_gettime_func; | |
1402 } else { | |
1403 // close librt if there is no monotonic clock | |
1404 dlclose(handle); | |
1405 } | |
1406 } | |
1407 } | |
1408 } | |
1409 | |
1410 #ifndef SYS_clock_getres | |
1411 | |
1412 #if defined(IA32) || defined(AMD64) | |
1413 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1414 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1415 #else |
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1416 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1417 #define sys_clock_getres(x,y) -1 |
0 | 1418 #endif |
1419 | |
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1420 #else |
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1421 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1422 #endif |
1423 | |
1424 void os::Linux::fast_thread_clock_init() { | |
1425 if (!UseLinuxPosixThreadCPUClocks) { | |
1426 return; | |
1427 } | |
1428 clockid_t clockid; | |
1429 struct timespec tp; | |
1430 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1431 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1432 | |
1433 // Switch to using fast clocks for thread cpu time if | |
1434 // the sys_clock_getres() returns 0 error code. | |
1435 // Note, that some kernels may support the current thread | |
1436 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1437 // returned by the pthread_getcpuclockid(). | |
1438 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1439 // must return at least tp.tv_sec == 0 which means a resolution | |
1440 // better than 1 sec. This is extra check for reliability. | |
1441 | |
1442 if(pthread_getcpuclockid_func && | |
1443 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1444 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1445 | |
1446 _supports_fast_thread_cpu_time = true; | |
1447 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1448 } | |
1449 } | |
1450 | |
1451 jlong os::javaTimeNanos() { | |
1452 if (Linux::supports_monotonic_clock()) { | |
1453 struct timespec tp; | |
1454 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1455 assert(status == 0, "gettime error"); | |
1456 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1457 return result; | |
1458 } else { | |
1459 timeval time; | |
1460 int status = gettimeofday(&time, NULL); | |
1461 assert(status != -1, "linux error"); | |
1462 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1463 return 1000 * usecs; | |
1464 } | |
1465 } | |
1466 | |
1467 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1468 if (Linux::supports_monotonic_clock()) { | |
1469 info_ptr->max_value = ALL_64_BITS; | |
1470 | |
1471 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1472 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1473 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1474 } else { | |
1475 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1476 info_ptr->max_value = ALL_64_BITS; | |
1477 | |
1478 // gettimeofday is a real time clock so it skips | |
1479 info_ptr->may_skip_backward = true; | |
1480 info_ptr->may_skip_forward = true; | |
1481 } | |
1482 | |
1483 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1484 } | |
1485 | |
1486 // Return the real, user, and system times in seconds from an | |
1487 // arbitrary fixed point in the past. | |
1488 bool os::getTimesSecs(double* process_real_time, | |
1489 double* process_user_time, | |
1490 double* process_system_time) { | |
1491 struct tms ticks; | |
1492 clock_t real_ticks = times(&ticks); | |
1493 | |
1494 if (real_ticks == (clock_t) (-1)) { | |
1495 return false; | |
1496 } else { | |
1497 double ticks_per_second = (double) clock_tics_per_sec; | |
1498 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1499 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1500 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1501 | |
1502 return true; | |
1503 } | |
1504 } | |
1505 | |
1506 | |
1507 char * os::local_time_string(char *buf, size_t buflen) { | |
1508 struct tm t; | |
1509 time_t long_time; | |
1510 time(&long_time); | |
1511 localtime_r(&long_time, &t); | |
1512 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1513 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1514 t.tm_hour, t.tm_min, t.tm_sec); | |
1515 return buf; | |
1516 } | |
1517 | |
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1518 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1519 return localtime_r(clock, res); |
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1520 } |
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1521 |
0 | 1522 //////////////////////////////////////////////////////////////////////////////// |
1523 // runtime exit support | |
1524 | |
1525 // Note: os::shutdown() might be called very early during initialization, or | |
1526 // called from signal handler. Before adding something to os::shutdown(), make | |
1527 // sure it is async-safe and can handle partially initialized VM. | |
1528 void os::shutdown() { | |
1529 | |
1530 // allow PerfMemory to attempt cleanup of any persistent resources | |
1531 perfMemory_exit(); | |
1532 | |
1533 // needs to remove object in file system | |
1534 AttachListener::abort(); | |
1535 | |
1536 // flush buffered output, finish log files | |
1537 ostream_abort(); | |
1538 | |
1539 // Check for abort hook | |
1540 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1541 if (abort_hook != NULL) { | |
1542 abort_hook(); | |
1543 } | |
1544 | |
1545 } | |
1546 | |
1547 // Note: os::abort() might be called very early during initialization, or | |
1548 // called from signal handler. Before adding something to os::abort(), make | |
1549 // sure it is async-safe and can handle partially initialized VM. | |
1550 void os::abort(bool dump_core) { | |
1551 os::shutdown(); | |
1552 if (dump_core) { | |
1553 #ifndef PRODUCT | |
1554 fdStream out(defaultStream::output_fd()); | |
1555 out.print_raw("Current thread is "); | |
1556 char buf[16]; | |
1557 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1558 out.print_raw_cr(buf); | |
1559 out.print_raw_cr("Dumping core ..."); | |
1560 #endif | |
1561 ::abort(); // dump core | |
1562 } | |
1563 | |
1564 ::exit(1); | |
1565 } | |
1566 | |
1567 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1568 void os::die() { | |
1569 // _exit() on LinuxThreads only kills current thread | |
1570 ::abort(); | |
1571 } | |
1572 | |
1573 // unused on linux for now. | |
1574 void os::set_error_file(const char *logfile) {} | |
1575 | |
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1576 |
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1577 // This method is a copy of JDK's sysGetLastErrorString |
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1578 // from src/solaris/hpi/src/system_md.c |
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1579 |
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1580 size_t os::lasterror(char *buf, size_t len) { |
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1581 |
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1582 if (errno == 0) return 0; |
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1583 |
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1584 const char *s = ::strerror(errno); |
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1585 size_t n = ::strlen(s); |
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1586 if (n >= len) { |
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1587 n = len - 1; |
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|
1588 } |
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1589 ::strncpy(buf, s, n); |
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|
1590 buf[n] = '\0'; |
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1591 return n; |
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1592 } |
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1593 |
0 | 1594 intx os::current_thread_id() { return (intx)pthread_self(); } |
1595 int os::current_process_id() { | |
1596 | |
1597 // Under the old linux thread library, linux gives each thread | |
1598 // its own process id. Because of this each thread will return | |
1599 // a different pid if this method were to return the result | |
1600 // of getpid(2). Linux provides no api that returns the pid | |
1601 // of the launcher thread for the vm. This implementation | |
1602 // returns a unique pid, the pid of the launcher thread | |
1603 // that starts the vm 'process'. | |
1604 | |
1605 // Under the NPTL, getpid() returns the same pid as the | |
1606 // launcher thread rather than a unique pid per thread. | |
1607 // Use gettid() if you want the old pre NPTL behaviour. | |
1608 | |
1609 // if you are looking for the result of a call to getpid() that | |
1610 // returns a unique pid for the calling thread, then look at the | |
1611 // OSThread::thread_id() method in osThread_linux.hpp file | |
1612 | |
1613 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1614 } | |
1615 | |
1616 // DLL functions | |
1617 | |
1618 const char* os::dll_file_extension() { return ".so"; } | |
1619 | |
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1620 // This must be hard coded because it's the system's temporary |
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1621 // directory not the java application's temp directory, ala java.io.tmpdir. |
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1622 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1623 |
691 | 1624 static bool file_exists(const char* filename) { |
1625 struct stat statbuf; | |
1626 if (filename == NULL || strlen(filename) == 0) { | |
1627 return false; | |
1628 } | |
1629 return os::stat(filename, &statbuf) == 0; | |
1630 } | |
1631 | |
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1632 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1633 const char* pname, const char* fname) { |
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1634 bool retval = false; |
691 | 1635 // Copied from libhpi |
242 | 1636 const size_t pnamelen = pname ? strlen(pname) : 0; |
1637 | |
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1638 // Return error on buffer overflow. |
242 | 1639 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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1640 return retval; |
242 | 1641 } |
1642 | |
1643 if (pnamelen == 0) { | |
691 | 1644 snprintf(buffer, buflen, "lib%s.so", fname); |
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1645 retval = true; |
691 | 1646 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1647 int n; | |
1648 char** pelements = split_path(pname, &n); | |
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1649 if (pelements == NULL) { |
9062 | 1650 return false; |
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|
1651 } |
691 | 1652 for (int i = 0 ; i < n ; i++) { |
1653 // Really shouldn't be NULL, but check can't hurt | |
1654 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1655 continue; // skip the empty path values | |
1656 } | |
1657 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1658 if (file_exists(buffer)) { | |
6966
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|
1659 retval = true; |
691 | 1660 break; |
1661 } | |
1662 } | |
1663 // release the storage | |
1664 for (int i = 0 ; i < n ; i++) { | |
1665 if (pelements[i] != NULL) { | |
6197 | 1666 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1667 } |
1668 } | |
1669 if (pelements != NULL) { | |
6197 | 1670 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1671 } |
242 | 1672 } else { |
691 | 1673 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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|
1674 retval = true; |
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|
1675 } |
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|
1676 return retval; |
242 | 1677 } |
1678 | |
7456
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|
1679 // check if addr is inside libjvm.so |
0 | 1680 bool os::address_is_in_vm(address addr) { |
1681 static address libjvm_base_addr; | |
1682 Dl_info dlinfo; | |
1683 | |
1684 if (libjvm_base_addr == NULL) { | |
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|
1685 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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|
1686 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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|
1687 } |
0 | 1688 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1689 } | |
1690 | |
11092
59b052799158
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|
1691 if (dladdr((void *)addr, &dlinfo) != 0) { |
0 | 1692 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1693 } | |
1694 | |
1695 return false; | |
1696 } | |
1697 | |
1698 bool os::dll_address_to_function_name(address addr, char *buf, | |
1699 int buflen, int *offset) { | |
11092
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|
1700 // buf is not optional, but offset is optional |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1701 assert(buf != NULL, "sanity check"); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1702 |
0 | 1703 Dl_info dlinfo; |
1704 | |
11092
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|
1705 if (dladdr((void*)addr, &dlinfo) != 0) { |
59b052799158
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|
1706 // see if we have a matching symbol |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1707 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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|
1708 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
2022
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7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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|
1709 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
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|
1710 } |
11092
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|
1711 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
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|
1712 return true; |
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|
1713 } |
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|
1714 // no matching symbol so try for just file info |
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|
1715 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
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|
1716 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
59b052799158
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|
1717 buf, buflen, offset, dlinfo.dli_fname)) { |
59b052799158
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|
1718 return true; |
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|
1719 } |
2022
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|
1720 } |
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|
1721 } |
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|
1722 |
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|
1723 buf[0] = '\0'; |
2022
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|
1724 if (offset != NULL) *offset = -1; |
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|
1725 return false; |
0 | 1726 } |
1727 | |
1728 struct _address_to_library_name { | |
1729 address addr; // input : memory address | |
1730 size_t buflen; // size of fname | |
1731 char* fname; // output: library name | |
1732 address base; // library base addr | |
1733 }; | |
1734 | |
1735 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1736 size_t size, void *data) { | |
1737 int i; | |
1738 bool found = false; | |
1739 address libbase = NULL; | |
1740 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1741 | |
1742 // iterate through all loadable segments | |
1743 for (i = 0; i < info->dlpi_phnum; i++) { | |
1744 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1745 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1746 // base address of a library is the lowest address of its loaded | |
1747 // segments. | |
1748 if (libbase == NULL || libbase > segbase) { | |
1749 libbase = segbase; | |
1750 } | |
1751 // see if 'addr' is within current segment | |
1752 if (segbase <= d->addr && | |
1753 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1754 found = true; | |
1755 } | |
1756 } | |
1757 } | |
1758 | |
1759 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1760 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1761 // can figure out executable name from argv[0]. | |
1762 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1763 d->base = libbase; | |
1764 if (d->fname) { | |
1765 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1766 } | |
1767 return 1; | |
1768 } | |
1769 return 0; | |
1770 } | |
1771 | |
1772 bool os::dll_address_to_library_name(address addr, char* buf, | |
1773 int buflen, int* offset) { | |
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|
1774 // buf is not optional, but offset is optional |
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|
1775 assert(buf != NULL, "sanity check"); |
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|
1776 |
0 | 1777 Dl_info dlinfo; |
1778 struct _address_to_library_name data; | |
1779 | |
1780 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1781 // to wrong library name if the .so file has a base address != NULL. Here | |
1782 // we iterate through the program headers of all loaded libraries to find | |
1783 // out which library 'addr' really belongs to. This workaround can be | |
1784 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1785 data.addr = addr; | |
1786 data.fname = buf; | |
1787 data.buflen = buflen; | |
1788 data.base = NULL; | |
1789 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1790 | |
1791 if (rslt) { | |
1792 // buf already contains library name | |
1793 if (offset) *offset = addr - data.base; | |
1794 return true; | |
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|
1795 } |
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|
1796 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1797 if (dlinfo.dli_fname != NULL) { |
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|
1798 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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|
1799 } |
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|
1800 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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|
1801 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1802 } |
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|
1803 return true; |
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|
1804 } |
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|
1805 |
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|
1806 buf[0] = '\0'; |
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|
1807 if (offset) *offset = -1; |
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|
1808 return false; |
0 | 1809 } |
1810 | |
1811 // Loads .dll/.so and | |
1812 // in case of error it checks if .dll/.so was built for the | |
1813 // same architecture as Hotspot is running on | |
1814 | |
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1815 |
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1816 // Remember the stack's state. The Linux dynamic linker will change |
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1817 // the stack to 'executable' at most once, so we must safepoint only once. |
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|
1818 bool os::Linux::_stack_is_executable = false; |
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1819 |
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1820 // VM operation that loads a library. This is necessary if stack protection |
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1821 // of the Java stacks can be lost during loading the library. If we |
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1822 // do not stop the Java threads, they can stack overflow before the stacks |
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1823 // are protected again. |
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1824 class VM_LinuxDllLoad: public VM_Operation { |
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1825 private: |
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1826 const char *_filename; |
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1827 char *_ebuf; |
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|
1828 int _ebuflen; |
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1829 void *_lib; |
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1830 public: |
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1831 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1832 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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1833 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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|
1834 void doit() { |
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|
1835 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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1836 os::Linux::_stack_is_executable = true; |
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1837 } |
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1838 void* loaded_library() { return _lib; } |
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1839 }; |
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|
1840 |
0 | 1841 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1842 { | |
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1843 void * result = NULL; |
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|
1844 bool load_attempted = false; |
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|
1845 |
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|
1846 // Check whether the library to load might change execution rights |
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1847 // of the stack. If they are changed, the protection of the stack |
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1848 // guard pages will be lost. We need a safepoint to fix this. |
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|
1849 // |
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1850 // See Linux man page execstack(8) for more info. |
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|
1851 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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|
1852 ElfFile ef(filename); |
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|
1853 if (!ef.specifies_noexecstack()) { |
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1854 if (!is_init_completed()) { |
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|
1855 os::Linux::_stack_is_executable = true; |
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1856 // This is OK - No Java threads have been created yet, and hence no |
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|
1857 // stack guard pages to fix. |
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|
1858 // |
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|
1859 // This should happen only when you are building JDK7 using a very |
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1860 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1861 // |
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1862 // Dynamic loader will make all stacks executable after |
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1863 // this function returns, and will not do that again. |
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1864 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1865 } else { |
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1866 warning("You have loaded library %s which might have disabled stack guard. " |
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1867 "The VM will try to fix the stack guard now.\n" |
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1868 "It's highly recommended that you fix the library with " |
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1869 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1870 filename); |
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1871 |
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1872 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1873 JavaThread *jt = JavaThread::current(); |
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1874 if (jt->thread_state() != _thread_in_native) { |
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1875 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1876 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1877 warning("Unable to fix stack guard. Giving up."); |
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1878 } else { |
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1879 if (!LoadExecStackDllInVMThread) { |
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1880 // This is for the case where the DLL has an static |
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1881 // constructor function that executes JNI code. We cannot |
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1882 // load such DLLs in the VMThread. |
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1883 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1884 } |
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1885 |
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1886 ThreadInVMfromNative tiv(jt); |
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1887 debug_only(VMNativeEntryWrapper vew;) |
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1888 |
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1889 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1890 VMThread::execute(&op); |
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1891 if (LoadExecStackDllInVMThread) { |
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1892 result = op.loaded_library(); |
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1893 } |
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1894 load_attempted = true; |
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1895 } |
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1896 } |
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1897 } |
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1898 } |
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1899 |
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1900 if (!load_attempted) { |
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1901 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1902 } |
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1903 |
0 | 1904 if (result != NULL) { |
1905 // Successful loading | |
1906 return result; | |
1907 } | |
1908 | |
1909 Elf32_Ehdr elf_head; | |
1910 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1911 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1912 | |
1913 if (diag_msg_max_length==0) { | |
1914 // No more space in ebuf for additional diagnostics message | |
1915 return NULL; | |
1916 } | |
1917 | |
1918 | |
1919 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1920 | |
1921 if (file_descriptor < 0) { | |
1922 // Can't open library, report dlerror() message | |
1923 return NULL; | |
1924 } | |
1925 | |
1926 bool failed_to_read_elf_head= | |
1927 (sizeof(elf_head)!= | |
1928 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1929 | |
1930 ::close(file_descriptor); | |
1931 if (failed_to_read_elf_head) { | |
1932 // file i/o error - report dlerror() msg | |
1933 return NULL; | |
1934 } | |
1935 | |
1936 typedef struct { | |
1937 Elf32_Half code; // Actual value as defined in elf.h | |
1938 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1939 char elf_class; // 32 or 64 bit | |
1940 char endianess; // MSB or LSB | |
1941 char* name; // String representation | |
1942 } arch_t; | |
1943 | |
1944 #ifndef EM_486 | |
1945 #define EM_486 6 /* Intel 80486 */ | |
1946 #endif | |
1947 | |
1948 static const arch_t arch_array[]={ | |
1949 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1950 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1951 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1952 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1953 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1954 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1955 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1956 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1010 | 1957 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
1958 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1959 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1960 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1961 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1962 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1963 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1964 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1965 }; |
1966 | |
1967 #if (defined IA32) | |
1968 static Elf32_Half running_arch_code=EM_386; | |
1969 #elif (defined AMD64) | |
1970 static Elf32_Half running_arch_code=EM_X86_64; | |
1971 #elif (defined IA64) | |
1972 static Elf32_Half running_arch_code=EM_IA_64; | |
1973 #elif (defined __sparc) && (defined _LP64) | |
1974 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1975 #elif (defined __sparc) && (!defined _LP64) | |
1976 static Elf32_Half running_arch_code=EM_SPARC; | |
1977 #elif (defined __powerpc64__) | |
1978 static Elf32_Half running_arch_code=EM_PPC64; | |
1979 #elif (defined __powerpc__) | |
1980 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1981 #elif (defined ARM) |
1982 static Elf32_Half running_arch_code=EM_ARM; | |
1983 #elif (defined S390) | |
1984 static Elf32_Half running_arch_code=EM_S390; | |
1985 #elif (defined ALPHA) | |
1986 static Elf32_Half running_arch_code=EM_ALPHA; | |
1987 #elif (defined MIPSEL) | |
1988 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1989 #elif (defined PARISC) | |
1990 static Elf32_Half running_arch_code=EM_PARISC; | |
1991 #elif (defined MIPS) | |
1992 static Elf32_Half running_arch_code=EM_MIPS; | |
1993 #elif (defined M68K) | |
1994 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1995 #else |
1996 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1997 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 1998 #endif |
1999 | |
2000 // Identify compatability class for VM's architecture and library's architecture | |
2001 // Obtain string descriptions for architectures | |
2002 | |
2003 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
2004 int running_arch_index=-1; | |
2005 | |
2006 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
2007 if (running_arch_code == arch_array[i].code) { | |
2008 running_arch_index = i; | |
2009 } | |
2010 if (lib_arch.code == arch_array[i].code) { | |
2011 lib_arch.compat_class = arch_array[i].compat_class; | |
2012 lib_arch.name = arch_array[i].name; | |
2013 } | |
2014 } | |
2015 | |
2016 assert(running_arch_index != -1, | |
2017 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
2018 if (running_arch_index == -1) { | |
2019 // Even though running architecture detection failed | |
2020 // we may still continue with reporting dlerror() message | |
2021 return NULL; | |
2022 } | |
2023 | |
2024 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
2025 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
2026 return NULL; | |
2027 } | |
2028 | |
1010 | 2029 #ifndef S390 |
0 | 2030 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
2031 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
2032 return NULL; | |
2033 } | |
1010 | 2034 #endif // !S390 |
0 | 2035 |
2036 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
2037 if ( lib_arch.name!=NULL ) { | |
2038 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2039 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
2040 lib_arch.name, arch_array[running_arch_index].name); | |
2041 } else { | |
2042 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2043 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
2044 lib_arch.code, | |
2045 arch_array[running_arch_index].name); | |
2046 } | |
2047 } | |
2048 | |
2049 return NULL; | |
2050 } | |
2051 | |
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2052 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2053 void * result = ::dlopen(filename, RTLD_LAZY); |
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2054 if (result == NULL) { |
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2055 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2056 ebuf[ebuflen-1] = '\0'; |
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2057 } |
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2058 return result; |
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2059 } |
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2060 |
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2061 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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2062 void * result = NULL; |
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2063 if (LoadExecStackDllInVMThread) { |
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2064 result = dlopen_helper(filename, ebuf, ebuflen); |
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2065 } |
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2066 |
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2067 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2068 // library that requires an executable stack, or which does not have this |
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2069 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2070 // read protection of the guard pages gets lost. |
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2071 // |
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2072 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2073 // may have been queued at the same time. |
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2074 |
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2075 if (!_stack_is_executable) { |
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2076 JavaThread *jt = Threads::first(); |
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2077 |
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2078 while (jt) { |
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2079 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2080 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2081 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2082 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2083 warning("Attempt to reguard stack yellow zone failed."); |
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2084 } |
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2085 } |
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2086 jt = jt->next(); |
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2087 } |
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2088 } |
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2089 |
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2090 return result; |
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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 |
242 | 2093 /* |
2094 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2095 * chances are you might want to run the generated bits against glibc-2.0 | |
2096 * libdl.so, so always use locking for any version of glibc. | |
2097 */ | |
2098 void* os::dll_lookup(void* handle, const char* name) { | |
2099 pthread_mutex_lock(&dl_mutex); | |
2100 void* res = dlsym(handle, name); | |
2101 pthread_mutex_unlock(&dl_mutex); | |
2102 return res; | |
2103 } | |
0 | 2104 |
2105 | |
1980
828eafbd85cc
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diff
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|
2106 static bool _print_ascii_file(const char* filename, outputStream* st) { |
828eafbd85cc
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|
2107 int fd = ::open(filename, O_RDONLY); |
0 | 2108 if (fd == -1) { |
2109 return false; | |
2110 } | |
2111 | |
2112 char buf[32]; | |
2113 int bytes; | |
1980
828eafbd85cc
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|
2114 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2115 st->print_raw(buf, bytes); |
2116 } | |
2117 | |
1980
828eafbd85cc
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|
2118 ::close(fd); |
0 | 2119 |
2120 return true; | |
2121 } | |
2122 | |
2123 void os::print_dll_info(outputStream *st) { | |
2124 st->print_cr("Dynamic libraries:"); | |
2125 | |
2126 char fname[32]; | |
2127 pid_t pid = os::Linux::gettid(); | |
2128 | |
2129 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2130 | |
2131 if (!_print_ascii_file(fname, st)) { | |
2132 st->print("Can not get library information for pid = %d\n", pid); | |
2133 } | |
2134 } | |
2135 | |
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|
2136 void os::print_os_info_brief(outputStream* st) { |
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|
2137 os::Linux::print_distro_info(st); |
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|
2138 |
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|
2139 os::Posix::print_uname_info(st); |
7432b9db36ff
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diff
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|
2140 |
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|
2141 os::Linux::print_libversion_info(st); |
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|
2142 |
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|
2143 } |
0 | 2144 |
2145 void os::print_os_info(outputStream* st) { | |
2146 st->print("OS:"); | |
2147 | |
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|
2148 os::Linux::print_distro_info(st); |
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|
2149 |
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|
2150 os::Posix::print_uname_info(st); |
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|
2151 |
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|
2152 // Print warning if unsafe chroot environment detected |
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diff
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|
2153 if (unsafe_chroot_detected) { |
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|
2154 st->print("WARNING!! "); |
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|
2155 st->print_cr(unstable_chroot_error); |
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diff
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|
2156 } |
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|
2157 |
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|
2158 os::Linux::print_libversion_info(st); |
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|
2159 |
7432b9db36ff
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diff
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|
2160 os::Posix::print_rlimit_info(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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diff
changeset
|
2161 |
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diff
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|
2162 os::Posix::print_load_average(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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diff
changeset
|
2163 |
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7165755: OS Information much longer on linux than other platforms
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|
2164 os::Linux::print_full_memory_info(st); |
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diff
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|
2165 } |
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diff
changeset
|
2166 |
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7165755: OS Information much longer on linux than other platforms
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diff
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|
2167 // Try to identify popular distros. |
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diff
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|
2168 // Most Linux distributions have /etc/XXX-release file, which contains |
7432b9db36ff
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diff
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|
2169 // the OS version string. Some have more than one /etc/XXX-release file |
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|
2170 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5937
diff
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|
2171 // so the order is important. |
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diff
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|
2172 void os::Linux::print_distro_info(outputStream* st) { |
0 | 2173 if (!_print_ascii_file("/etc/mandrake-release", st) && |
2174 !_print_ascii_file("/etc/sun-release", st) && | |
2175 !_print_ascii_file("/etc/redhat-release", st) && | |
2176 !_print_ascii_file("/etc/SuSE-release", st) && | |
2177 !_print_ascii_file("/etc/turbolinux-release", st) && | |
2178 !_print_ascii_file("/etc/gentoo-release", st) && | |
1681
126ea7725993
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diff
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|
2179 !_print_ascii_file("/etc/debian_version", st) && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1642
diff
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|
2180 !_print_ascii_file("/etc/ltib-release", st) && |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
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|
2181 !_print_ascii_file("/etc/angstrom-version", st)) { |
0 | 2182 st->print("Linux"); |
2183 } | |
2184 st->cr(); | |
6080
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diff
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|
2185 } |
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diff
changeset
|
2186 |
7432b9db36ff
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|
2187 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2188 // libc, pthread |
2189 st->print("libc:"); | |
2190 st->print(os::Linux::glibc_version()); st->print(" "); | |
2191 st->print(os::Linux::libpthread_version()); st->print(" "); | |
2192 if (os::Linux::is_LinuxThreads()) { | |
2193 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2194 } | |
2195 st->cr(); | |
6080
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|
2196 } |
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diff
changeset
|
2197 |
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7165755: OS Information much longer on linux than other platforms
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|
2198 void os::Linux::print_full_memory_info(outputStream* st) { |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5937
diff
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|
2199 st->print("\n/proc/meminfo:\n"); |
7432b9db36ff
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5937
diff
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|
2200 _print_ascii_file("/proc/meminfo", st); |
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5937
diff
changeset
|
2201 st->cr(); |
3800
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
changeset
|
2202 } |
bf6481e5f96d
7061225: os::print_cpu_info() should support os-specific data
jcoomes
parents:
3358
diff
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|
2203 |
0 | 2204 void os::print_memory_info(outputStream* st) { |
2205 | |
2206 st->print("Memory:"); | |
2207 st->print(" %dk page", os::vm_page_size()>>10); | |
2208 | |
2209 // values in struct sysinfo are "unsigned long" | |
2210 struct sysinfo si; | |
2211 sysinfo(&si); | |
2212 | |
2213 st->print(", physical " UINT64_FORMAT "k", | |
2214 os::physical_memory() >> 10); | |
2215 st->print("(" UINT64_FORMAT "k free)", | |
2216 os::available_memory() >> 10); | |
2217 st->print(", swap " UINT64_FORMAT "k", | |
2218 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2219 st->print("(" UINT64_FORMAT "k free)", | |
2220 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2221 st->cr(); | |
2222 } | |
2223 | |
6080
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5937
diff
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|
2224 void os::pd_print_cpu_info(outputStream* st) { |
7432b9db36ff
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5937
diff
changeset
|
2225 st->print("\n/proc/cpuinfo:\n"); |
7432b9db36ff
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parents:
5937
diff
changeset
|
2226 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5937
diff
changeset
|
2227 st->print(" <Not Available>"); |
7432b9db36ff
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parents:
5937
diff
changeset
|
2228 } |
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5937
diff
changeset
|
2229 st->cr(); |
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5937
diff
changeset
|
2230 } |
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diff
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|
2231 |
0 | 2232 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific |
2233 // but they're the same for all the linux arch that we support | |
2234 // and they're the same for solaris but there's no common place to put this. | |
2235 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
2236 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
2237 "ILL_COPROC", "ILL_BADSTK" }; | |
2238 | |
2239 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
2240 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
2241 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
2242 | |
2243 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
2244 | |
2245 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
2246 | |
2247 void os::print_siginfo(outputStream* st, void* siginfo) { | |
2248 st->print("siginfo:"); | |
2249 | |
2250 const int buflen = 100; | |
2251 char buf[buflen]; | |
2252 siginfo_t *si = (siginfo_t*)siginfo; | |
2253 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
2254 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
2255 st->print("si_errno=%s", buf); | |
2256 } else { | |
2257 st->print("si_errno=%d", si->si_errno); | |
2258 } | |
2259 const int c = si->si_code; | |
2260 assert(c > 0, "unexpected si_code"); | |
2261 switch (si->si_signo) { | |
2262 case SIGILL: | |
2263 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
2264 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2265 break; | |
2266 case SIGFPE: | |
2267 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
2268 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2269 break; | |
2270 case SIGSEGV: | |
2271 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
2272 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2273 break; | |
2274 case SIGBUS: | |
2275 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
2276 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2277 break; | |
2278 default: | |
2279 st->print(", si_code=%d", si->si_code); | |
2280 // no si_addr | |
2281 } | |
2282 | |
2283 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
2284 UseSharedSpaces) { | |
2285 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2286 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2287 st->print("\n\nError accessing class data sharing archive." \ | |
2288 " Mapped file inaccessible during execution, " \ | |
2289 " possible disk/network problem."); | |
2290 } | |
2291 } | |
2292 st->cr(); | |
2293 } | |
2294 | |
2295 | |
2296 static void print_signal_handler(outputStream* st, int sig, | |
2297 char* buf, size_t buflen); | |
2298 | |
2299 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2300 st->print_cr("Signal Handlers:"); | |
2301 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2302 print_signal_handler(st, SIGBUS , buf, buflen); | |
2303 print_signal_handler(st, SIGFPE , buf, buflen); | |
2304 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2305 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2306 print_signal_handler(st, SIGILL , buf, buflen); | |
2307 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2308 print_signal_handler(st, SR_signum, buf, buflen); | |
2309 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2310 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2311 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2312 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
2313 } | |
2314 | |
2315 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2316 | |
7456
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7206
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|
2317 // Find the full path to the current module, libjvm.so |
1642 | 2318 void os::jvm_path(char *buf, jint buflen) { |
0 | 2319 // Error checking. |
1642 | 2320 if (buflen < MAXPATHLEN) { |
0 | 2321 assert(false, "must use a large-enough buffer"); |
2322 buf[0] = '\0'; | |
2323 return; | |
2324 } | |
2325 // Lazy resolve the path to current module. | |
2326 if (saved_jvm_path[0] != 0) { | |
2327 strcpy(buf, saved_jvm_path); | |
2328 return; | |
2329 } | |
2330 | |
2331 char dli_fname[MAXPATHLEN]; | |
2332 bool ret = dll_address_to_library_name( | |
2333 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2334 dli_fname, sizeof(dli_fname), NULL); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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diff
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|
2335 assert(ret, "cannot locate libjvm"); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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10986
diff
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|
2336 char *rp = NULL; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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10986
diff
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|
2337 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
|
2338 rp = realpath(dli_fname, buf); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
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|
2339 } |
1681
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diff
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|
2340 if (rp == NULL) |
513
2328d1d3f8cf
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477
diff
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|
2341 return; |
0 | 2342 |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2204
diff
changeset
|
2343 if (Arguments::created_by_gamma_launcher()) { |
0 | 2344 // Support for the gamma launcher. Typical value for buf is |
2345 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2346 // the right place in the string, then assume we are installed in a JDK and | |
2347 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2348 // up the path so it looks like libjvm.so is installed there (append a | |
2349 // fake suffix hotspot/libjvm.so). | |
2350 const char *p = buf + strlen(buf) - 1; | |
2351 for (int count = 0; p > buf && count < 5; ++count) { | |
2352 for (--p; p > buf && *p != '/'; --p) | |
2353 /* empty */ ; | |
2354 } | |
2355 | |
2356 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2357 // Look for JAVA_HOME in the environment. | |
2358 char* java_home_var = ::getenv("JAVA_HOME"); | |
2359 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2360 char* jrelib_p; |
2361 int len; | |
2362 | |
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7206
diff
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|
2363 // Check the current module name "libjvm.so". |
0 | 2364 p = strrchr(buf, '/'); |
2365 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2366 | |
1681
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1642
diff
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|
2367 rp = realpath(java_home_var, buf); |
126ea7725993
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1642
diff
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|
2368 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
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|
2369 return; |
1642 | 2370 |
2371 // determine if this is a legacy image or modules image | |
2372 // modules image doesn't have "jre" subdirectory | |
2373 len = strlen(buf); | |
2374 jrelib_p = buf + len; | |
2375 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2376 if (0 != access(buf, F_OK)) { | |
2377 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2378 } | |
2379 | |
0 | 2380 if (0 == access(buf, F_OK)) { |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2381 // Use current module name "libjvm.so" |
1642 | 2382 len = strlen(buf); |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2383 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2384 } else { |
2385 // Go back to path of .so | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2386 rp = realpath(dli_fname, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2387 if (rp == NULL) |
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
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diff
changeset
|
2388 return; |
0 | 2389 } |
2390 } | |
2391 } | |
2392 } | |
2393 | |
2394 strcpy(saved_jvm_path, buf); | |
2395 } | |
2396 | |
2397 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2398 // no prefix required, not even "_" | |
2399 } | |
2400 | |
2401 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2402 // no suffix required | |
2403 } | |
2404 | |
2405 //////////////////////////////////////////////////////////////////////////////// | |
2406 // sun.misc.Signal support | |
2407 | |
2408 static volatile jint sigint_count = 0; | |
2409 | |
2410 static void | |
2411 UserHandler(int sig, void *siginfo, void *context) { | |
2412 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2413 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2414 // don't want to flood the manager thread with sem_post requests. | |
2415 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2416 return; | |
2417 | |
2418 // Ctrl-C is pressed during error reporting, likely because the error | |
2419 // handler fails to abort. Let VM die immediately. | |
2420 if (sig == SIGINT && is_error_reported()) { | |
2421 os::die(); | |
2422 } | |
2423 | |
2424 os::signal_notify(sig); | |
2425 } | |
2426 | |
2427 void* os::user_handler() { | |
2428 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2429 } | |
2430 | |
10405 | 2431 class Semaphore : public StackObj { |
2432 public: | |
2433 Semaphore(); | |
2434 ~Semaphore(); | |
2435 void signal(); | |
2436 void wait(); | |
2437 bool trywait(); | |
2438 bool timedwait(unsigned int sec, int nsec); | |
2439 private: | |
2440 sem_t _semaphore; | |
2441 }; | |
2442 | |
2443 | |
2444 Semaphore::Semaphore() { | |
2445 sem_init(&_semaphore, 0, 0); | |
2446 } | |
2447 | |
2448 Semaphore::~Semaphore() { | |
2449 sem_destroy(&_semaphore); | |
2450 } | |
2451 | |
2452 void Semaphore::signal() { | |
2453 sem_post(&_semaphore); | |
2454 } | |
2455 | |
2456 void Semaphore::wait() { | |
2457 sem_wait(&_semaphore); | |
2458 } | |
2459 | |
2460 bool Semaphore::trywait() { | |
2461 return sem_trywait(&_semaphore) == 0; | |
2462 } | |
2463 | |
2464 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
2465 struct timespec ts; | |
2466 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
2467 | |
2468 while (1) { | |
2469 int result = sem_timedwait(&_semaphore, &ts); | |
2470 if (result == 0) { | |
2471 return true; | |
2472 } else if (errno == EINTR) { | |
2473 continue; | |
2474 } else if (errno == ETIMEDOUT) { | |
2475 return false; | |
2476 } else { | |
2477 return false; | |
2478 } | |
2479 } | |
2480 } | |
2481 | |
0 | 2482 extern "C" { |
2483 typedef void (*sa_handler_t)(int); | |
2484 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2485 } | |
2486 | |
2487 void* os::signal(int signal_number, void* handler) { | |
2488 struct sigaction sigAct, oldSigAct; | |
2489 | |
2490 sigfillset(&(sigAct.sa_mask)); | |
2491 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2492 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2493 | |
2494 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2495 // -1 means registration failed | |
2496 return (void *)-1; | |
2497 } | |
2498 | |
2499 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2500 } | |
2501 | |
2502 void os::signal_raise(int signal_number) { | |
2503 ::raise(signal_number); | |
2504 } | |
2505 | |
2506 /* | |
2507 * The following code is moved from os.cpp for making this | |
2508 * code platform specific, which it is by its very nature. | |
2509 */ | |
2510 | |
2511 // Will be modified when max signal is changed to be dynamic | |
2512 int os::sigexitnum_pd() { | |
2513 return NSIG; | |
2514 } | |
2515 | |
2516 // a counter for each possible signal value | |
2517 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2518 | |
2519 // Linux(POSIX) specific hand shaking semaphore. | |
2520 static sem_t sig_sem; | |
10405 | 2521 static Semaphore sr_semaphore; |
0 | 2522 |
2523 void os::signal_init_pd() { | |
2524 // Initialize signal structures | |
2525 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2526 | |
2527 // Initialize signal semaphore | |
2528 ::sem_init(&sig_sem, 0, 0); | |
2529 } | |
2530 | |
2531 void os::signal_notify(int sig) { | |
2532 Atomic::inc(&pending_signals[sig]); | |
2533 ::sem_post(&sig_sem); | |
2534 } | |
2535 | |
2536 static int check_pending_signals(bool wait) { | |
2537 Atomic::store(0, &sigint_count); | |
2538 for (;;) { | |
2539 for (int i = 0; i < NSIG + 1; i++) { | |
2540 jint n = pending_signals[i]; | |
2541 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2542 return i; | |
2543 } | |
2544 } | |
2545 if (!wait) { | |
2546 return -1; | |
2547 } | |
2548 JavaThread *thread = JavaThread::current(); | |
2549 ThreadBlockInVM tbivm(thread); | |
2550 | |
2551 bool threadIsSuspended; | |
2552 do { | |
2553 thread->set_suspend_equivalent(); | |
2554 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2555 ::sem_wait(&sig_sem); | |
2556 | |
2557 // were we externally suspended while we were waiting? | |
2558 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2559 if (threadIsSuspended) { | |
2560 // | |
2561 // The semaphore has been incremented, but while we were waiting | |
2562 // another thread suspended us. We don't want to continue running | |
2563 // while suspended because that would surprise the thread that | |
2564 // suspended us. | |
2565 // | |
2566 ::sem_post(&sig_sem); | |
2567 | |
2568 thread->java_suspend_self(); | |
2569 } | |
2570 } while (threadIsSuspended); | |
2571 } | |
2572 } | |
2573 | |
2574 int os::signal_lookup() { | |
2575 return check_pending_signals(false); | |
2576 } | |
2577 | |
2578 int os::signal_wait() { | |
2579 return check_pending_signals(true); | |
2580 } | |
2581 | |
2582 //////////////////////////////////////////////////////////////////////////////// | |
2583 // Virtual Memory | |
2584 | |
2585 int os::vm_page_size() { | |
2586 // Seems redundant as all get out | |
2587 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2588 return os::Linux::page_size(); | |
2589 } | |
2590 | |
2591 // Solaris allocates memory by pages. | |
2592 int os::vm_allocation_granularity() { | |
2593 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2594 return os::Linux::page_size(); | |
2595 } | |
2596 | |
2597 // Rationale behind this function: | |
2598 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2599 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2600 // samples for JITted code. Here we create private executable mapping over the code cache | |
2601 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2602 // info for the reporting script by storing timestamp and location of symbol | |
2603 void linux_wrap_code(char* base, size_t size) { | |
2604 static volatile jint cnt = 0; | |
2605 | |
2606 if (!UseOprofile) { | |
2607 return; | |
2608 } | |
2609 | |
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
coleenp
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1353
diff
changeset
|
2610 char buf[PATH_MAX+1]; |
0 | 2611 int num = Atomic::add(1, &cnt); |
2612 | |
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
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1325
diff
changeset
|
2613 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
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1325
diff
changeset
|
2614 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2615 unlink(buf); |
2616 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
2617 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2618 |
2619 if (fd != -1) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2620 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2621 if (rv != (off_t)-1) { |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
2622 if (::write(fd, "", 1) == 1) { |
0 | 2623 mmap(base, size, |
2624 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2625 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2626 } | |
2627 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2628 ::close(fd); |
0 | 2629 unlink(buf); |
2630 } | |
2631 } | |
2632 | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2633 static bool recoverable_mmap_error(int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
changeset
|
2634 // 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
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10405
diff
changeset
|
2635 // 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
|
2636 // Linux man page that documents this specific set of errno |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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parents:
10405
diff
changeset
|
2637 // values so while this list currently matches Solaris, it may |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2638 // change as we gain experience with this failure mode. |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2639 switch (err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2640 case EBADF: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2641 case EINVAL: |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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10405
diff
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|
2642 case ENOTSUP: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
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|
2643 // let the caller deal with these errors |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
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|
2644 return true; |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
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10405
diff
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|
2645 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
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10405
diff
changeset
|
2646 default: |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2647 // 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
|
2648 // 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
|
2649 // structures think they have the same memory mapped. The worst |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2650 // scenario is if both the VM and a library think they have the |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2651 // same memory mapped. |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2652 return false; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2653 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2654 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2655 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2656 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2657 int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2658 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2659 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2660 strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2661 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2662 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2663 static void warn_fail_commit_memory(char* addr, size_t size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2664 size_t alignment_hint, bool exec, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2665 int err) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2666 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2667 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2668 alignment_hint, exec, strerror(err), err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2669 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2670 |
0 | 2671 // NOTE: Linux kernel does not really reserve the pages for us. |
2672 // All it does is to check if there are enough free pages | |
2673 // left at the time of mmap(). This could be a potential | |
2674 // problem. | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2675 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
656 | 2676 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2677 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2678 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2679 if (res != (uintptr_t) MAP_FAILED) { |
2680 if (UseNUMAInterleaving) { | |
2681 numa_make_global(addr, size); | |
2682 } | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2683 return 0; |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2684 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2685 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2686 int err = errno; // save errno from mmap() call above |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2687 |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2688 if (!recoverable_mmap_error(err)) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2689 warn_fail_commit_memory(addr, size, exec, err); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2690 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2691 } |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2692 |
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|
2693 return err; |
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|
2694 } |
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|
2695 |
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|
2696 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
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2697 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
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|
2698 } |
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|
2699 |
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|
2700 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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|
2701 const char* mesg) { |
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|
2702 assert(mesg != NULL, "mesg must be specified"); |
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|
2703 int err = os::Linux::commit_memory_impl(addr, size, exec); |
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|
2704 if (err != 0) { |
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|
2705 // the caller wants all commit errors to exit with the specified mesg: |
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|
2706 warn_fail_commit_memory(addr, size, exec, err); |
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|
2707 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2708 } |
0 | 2709 } |
2710 | |
3286
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2711 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
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2712 #ifndef MAP_HUGETLB |
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2713 #define MAP_HUGETLB 0x40000 |
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2714 #endif |
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2715 |
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2716 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
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2717 #ifndef MADV_HUGEPAGE |
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2718 #define MADV_HUGEPAGE 14 |
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2719 #endif |
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2720 |
10969
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|
2721 int os::Linux::commit_memory_impl(char* addr, size_t size, |
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2722 size_t alignment_hint, bool exec) { |
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|
2723 int err; |
3286
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2724 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
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2725 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
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|
2726 uintptr_t res = |
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|
2727 (uintptr_t) ::mmap(addr, size, prot, |
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2728 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, |
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|
2729 -1, 0); |
3885 | 2730 if (res != (uintptr_t) MAP_FAILED) { |
2731 if (UseNUMAInterleaving) { | |
2732 numa_make_global(addr, size); | |
2733 } | |
10969
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|
2734 return 0; |
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|
2735 } |
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|
2736 |
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|
2737 err = errno; // save errno from mmap() call above |
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|
2738 |
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|
2739 if (!recoverable_mmap_error(err)) { |
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|
2740 // However, it is not clear that this loss of our reserved mapping |
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|
2741 // happens with large pages on Linux or that we cannot recover |
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|
2742 // from the loss. For now, we just issue a warning and we don't |
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|
2743 // call vm_exit_out_of_memory(). This issue is being tracked by |
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|
2744 // JBS-8007074. |
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|
2745 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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|
2746 // vm_exit_out_of_memory(size, OOM_MMAP_ERROR, |
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|
2747 // "committing reserved memory."); |
3885 | 2748 } |
3913
27702f012017
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|
2749 // Fall through and try to use small pages |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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|
2750 } |
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|
2751 |
10969
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|
2752 err = os::Linux::commit_memory_impl(addr, size, exec); |
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|
2753 if (err == 0) { |
3913
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|
2754 realign_memory(addr, size, alignment_hint); |
10969
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|
2755 } |
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|
2756 return err; |
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|
2757 } |
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|
2758 |
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|
2759 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2760 bool exec) { |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2761 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
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|
2762 } |
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|
2763 |
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|
2764 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2765 size_t alignment_hint, bool exec, |
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|
2766 const char* mesg) { |
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2767 assert(mesg != NULL, "mesg must be specified"); |
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|
2768 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2769 if (err != 0) { |
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|
2770 // the caller wants all commit errors to exit with the specified mesg: |
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|
2771 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
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|
2772 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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|
2773 } |
0 | 2774 } |
2775 | |
6197 | 2776 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3286
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|
2777 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
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|
2778 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
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|
2779 // be supported or the memory may already be backed by huge pages. |
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|
2780 ::madvise(addr, bytes, MADV_HUGEPAGE); |
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|
2781 } |
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|
2782 } |
141 | 2783 |
6197 | 2784 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
5937
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|
2785 // This method works by doing an mmap over an existing mmaping and effectively discarding |
cf956638b844
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|
2786 // the existing pages. However it won't work for SHM-based large pages that cannot be |
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|
2787 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
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|
2788 // small pages on top of the SHM segment. This method always works for small pages, so we |
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|
2789 // allow that in any case. |
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5909
diff
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|
2790 if (alignment_hint <= (size_t)os::vm_page_size() || !UseSHM) { |
10969
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|
2791 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
5937
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|
2792 } |
141 | 2793 } |
2794 | |
462
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6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
2795 void os::numa_make_global(char *addr, size_t bytes) { |
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|
2796 Linux::numa_interleave_memory(addr, bytes); |
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|
2797 } |
141 | 2798 |
2799 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2800 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); | |
2801 } | |
2802 | |
2803 bool os::numa_topology_changed() { return false; } | |
2804 | |
2805 size_t os::numa_get_groups_num() { | |
2806 int max_node = Linux::numa_max_node(); | |
2807 return max_node > 0 ? max_node + 1 : 1; | |
2808 } | |
2809 | |
2810 int os::numa_get_group_id() { | |
2811 int cpu_id = Linux::sched_getcpu(); | |
2812 if (cpu_id != -1) { | |
2813 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2814 if (lgrp_id != -1) { | |
2815 return lgrp_id; | |
2816 } | |
0 | 2817 } |
2818 return 0; | |
2819 } | |
2820 | |
141 | 2821 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2822 for (size_t i = 0; i < size; i++) { | |
2823 ids[i] = i; | |
2824 } | |
2825 return size; | |
2826 } | |
2827 | |
0 | 2828 bool os::get_page_info(char *start, page_info* info) { |
2829 return false; | |
2830 } | |
2831 | |
2832 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2833 return end; | |
2834 } | |
2835 | |
3826 | 2836 |
2837 int os::Linux::sched_getcpu_syscall(void) { | |
2838 unsigned int cpu; | |
2839 int retval = -1; | |
2840 | |
2841 #if defined(IA32) | |
3887
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|
2842 # ifndef SYS_getcpu |
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|
2843 # define SYS_getcpu 318 |
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|
2844 # endif |
3826 | 2845 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2846 #elif defined(AMD64) | |
3887
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|
2847 // Unfortunately we have to bring all these macros here from vsyscall.h |
9447b2fb6fcf
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|
2848 // to be able to compile on old linuxes. |
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|
2849 # define __NR_vgetcpu 2 |
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2850 # define VSYSCALL_START (-10UL << 20) |
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2851 # define VSYSCALL_SIZE 1024 |
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2852 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2853 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2854 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2855 retval = vgetcpu(&cpu, NULL, NULL); | |
2856 #endif | |
2857 | |
2858 return (retval == -1) ? retval : cpu; | |
2859 } | |
2860 | |
2191 | 2861 // Something to do with the numa-aware allocator needs these symbols |
2862 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2863 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2864 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2865 |
763
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2866 |
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2867 // If we are running with libnuma version > 2, then we should |
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2868 // be trying to use symbols with versions 1.1 |
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2869 // If we are running with earlier version, which did not have symbol versions, |
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2870 // we should use the base version. |
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2871 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
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2872 void *f = dlvsym(handle, name, "libnuma_1.1"); |
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2873 if (f == NULL) { |
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2874 f = dlsym(handle, name); |
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|
2875 } |
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2876 return f; |
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|
2877 } |
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2878 |
462
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2879 bool os::Linux::libnuma_init() { |
141 | 2880 // sched_getcpu() should be in libc. |
2881 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2882 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2883 | |
3826 | 2884 // If it's not, try a direct syscall. |
2885 if (sched_getcpu() == -1) | |
2886 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2887 | |
141 | 2888 if (sched_getcpu() != -1) { // Does it work? |
267
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2889 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2890 if (handle != NULL) { |
2891 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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2892 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2893 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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2894 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2895 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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2896 libnuma_dlsym(handle, "numa_available"))); |
141 | 2897 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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2898 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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2899 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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2900 libnuma_dlsym(handle, "numa_interleave_memory"))); |
462
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2901 |
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2902 |
141 | 2903 if (numa_available() != -1) { |
763
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2904 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2905 // Create a cpu -> node mapping |
6197 | 2906 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2907 rebuild_cpu_to_node_map(); |
462
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2908 return true; |
141 | 2909 } |
2910 } | |
2911 } | |
462
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2912 return false; |
141 | 2913 } |
2914 | |
2915 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2916 // The table is later used in get_node_by_cpu(). | |
2917 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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2918 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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2919 // in libnuma (possible values are starting from 16, |
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2920 // and continuing up with every other power of 2, but less |
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2921 // than the maximum number of CPUs supported by kernel), and |
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2922 // is a subject to change (in libnuma version 2 the requirements |
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2923 // are more reasonable) we'll just hardcode the number they use |
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2924 // in the library. |
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2925 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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2926 |
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2927 size_t cpu_num = os::active_processor_count(); |
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2928 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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2929 size_t cpu_map_valid_size = |
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|
2930 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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2931 |
141 | 2932 cpu_to_node()->clear(); |
2933 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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2934 size_t node_num = numa_get_groups_num(); |
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2935 |
6197 | 2936 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
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|
2937 for (size_t i = 0; i < node_num; i++) { |
141 | 2938 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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|
2939 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2940 if (cpu_map[j] != 0) { |
462
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2941 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2942 if (cpu_map[j] & (1UL << k)) { |
462
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|
2943 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2944 } |
2945 } | |
2946 } | |
2947 } | |
2948 } | |
2949 } | |
6197 | 2950 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2951 } |
2952 | |
2953 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2954 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2955 return cpu_to_node()->at(cpu_id); | |
2956 } | |
2957 return -1; | |
2958 } | |
2959 | |
2960 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2961 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2962 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2963 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2964 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2965 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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2966 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
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2967 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2968 |
6197 | 2969 bool os::pd_uncommit_memory(char* addr, size_t size) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
2970 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
126ea7725993
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|
2971 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
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|
2972 return res != (uintptr_t) MAP_FAILED; |
0 | 2973 } |
2974 | |
1320
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6929067: Stack guard pages should be removed when thread is detached
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|
2975 // 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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|
2976 // 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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|
2977 // stack cannot grow beyond the pages where the stack guard was |
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6929067: Stack guard pages should be removed when thread is detached
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|
2978 // 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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|
2979 // 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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|
2980 // 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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|
2981 // |
3b3d12e645e7
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|
2982 // However, it's essential not to split the stack region by unmapping |
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6929067: Stack guard pages should be removed when thread is detached
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|
2983 // a region (leaving a hole) that's already part of the stack mapping, |
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|
2984 // so if the stack mapping has already grown beyond the guard pages at |
3b3d12e645e7
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|
2985 // the time we create them, we have to truncate the stack mapping. |
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|
2986 // So, we need to know the extent of the stack mapping when |
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|
2987 // create_stack_guard_pages() is called. |
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|
2988 |
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|
2989 // Find the bounds of the stack mapping. Return true for success. |
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|
2990 // |
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|
2991 // We only need this for stacks that are growable: at the time of |
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|
2992 // writing thread stacks don't use growable mappings (i.e. those |
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|
2993 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
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|
2994 // only applies to the main thread. |
2469
677234770800
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|
2995 |
677234770800
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|
2996 static |
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|
2997 bool get_stack_bounds(uintptr_t *bottom, uintptr_t *top) { |
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|
2998 |
677234770800
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|
2999 char buf[128]; |
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|
3000 int fd, sz; |
677234770800
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|
3001 |
677234770800
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|
3002 if ((fd = ::open("/proc/self/maps", O_RDONLY)) < 0) { |
1320
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|
3003 return false; |
2469
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diff
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|
3004 } |
677234770800
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|
3005 |
677234770800
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|
3006 const char kw[] = "[stack]"; |
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|
3007 const int kwlen = sizeof(kw)-1; |
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|
3008 |
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|
3009 // Address part of /proc/self/maps couldn't be more than 128 bytes |
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|
3010 while ((sz = os::get_line_chars(fd, buf, sizeof(buf))) > 0) { |
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|
3011 if (sz > kwlen && ::memcmp(buf+sz-kwlen, kw, kwlen) == 0) { |
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|
3012 // Extract addresses |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3013 if (sscanf(buf, "%" SCNxPTR "-%" SCNxPTR, bottom, top) == 2) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3014 uintptr_t sp = (uintptr_t) __builtin_frame_address(0); |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3015 if (sp >= *bottom && sp <= *top) { |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3016 ::close(fd); |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3017 return true; |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3018 } |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3019 } |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3020 } |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3021 } |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3022 |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3023 ::close(fd); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3024 return false; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3025 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3026 |
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
3027 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3028 // If the (growable) stack mapping already extends beyond the point |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3029 // where we're going to put our guard pages, truncate the mapping at |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3030 // that point by munmap()ping it. This ensures that when we later |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3031 // munmap() the guard pages we don't leave a hole in the stack |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3032 // mapping. This only affects the main/initial thread, but guard |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3033 // against future OS changes |
6197 | 3034 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3035 uintptr_t stack_extent, stack_base; |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3036 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3037 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3038 assert(os::Linux::is_initial_thread(), |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3039 "growable stack in non-initial thread"); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3040 if (stack_extent < (uintptr_t)addr) |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3041 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3042 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3043 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3044 return os::commit_memory(addr, size, !ExecMem); |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3045 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3046 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3047 // 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
|
3048 // 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
|
3049 // affects the main/initial thread, but guard against future OS changes |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3050 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3051 uintptr_t stack_extent, stack_base; |
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3052 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3053 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3054 assert(os::Linux::is_initial_thread(), |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3055 "growable stack in non-initial thread"); |
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
3056 |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3057 return ::munmap(addr, size) == 0; |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3058 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3059 |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3060 return os::uncommit_memory(addr, size); |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3061 } |
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3062 |
0 | 3063 static address _highest_vm_reserved_address = NULL; |
3064 | |
3065 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
3066 // at 'requested_addr'. If there are existing memory mappings at the same | |
3067 // location, however, they will be overwritten. If 'fixed' is false, | |
3068 // 'requested_addr' is only treated as a hint, the return value may or | |
3069 // may not start from the requested address. Unlike Linux mmap(), this | |
3070 // function returns NULL to indicate failure. | |
3071 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
3072 char * addr; | |
3073 int flags; | |
3074 | |
3075 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
3076 if (fixed) { | |
3077 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
3078 flags |= MAP_FIXED; | |
3079 } | |
3080 | |
10157 | 3081 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
3082 // touch an uncommitted page. Otherwise, the read/write might | |
3083 // succeed if we have enough swap space to back the physical page. | |
3084 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
0 | 3085 flags, -1, 0); |
3086 | |
3087 if (addr != MAP_FAILED) { | |
3088 // anon_mmap() should only get called during VM initialization, | |
3089 // don't need lock (actually we can skip locking even it can be called | |
3090 // from multiple threads, because _highest_vm_reserved_address is just a | |
3091 // hint about the upper limit of non-stack memory regions.) | |
3092 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
3093 _highest_vm_reserved_address = (address)addr + bytes; | |
3094 } | |
3095 } | |
3096 | |
3097 return addr == MAP_FAILED ? NULL : addr; | |
3098 } | |
3099 | |
3100 // Don't update _highest_vm_reserved_address, because there might be memory | |
3101 // regions above addr + size. If so, releasing a memory region only creates | |
3102 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
3103 // | |
3104 static int anon_munmap(char * addr, size_t size) { | |
3105 return ::munmap(addr, size) == 0; | |
3106 } | |
3107 | |
6197 | 3108 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 3109 size_t alignment_hint) { |
3110 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
3111 } | |
3112 | |
6197 | 3113 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 3114 return anon_munmap(addr, size); |
3115 } | |
3116 | |
3117 static address highest_vm_reserved_address() { | |
3118 return _highest_vm_reserved_address; | |
3119 } | |
3120 | |
3121 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
3122 // Linux wants the mprotect address argument to be page aligned. | |
3123 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
3124 | |
3125 // According to SUSv3, mprotect() should only be used with mappings | |
3126 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
3127 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
3128 // protection of malloc'ed or statically allocated memory). Check the | |
3129 // caller if you hit this assert. | |
3130 assert(addr == bottom, "sanity check"); | |
3131 | |
3132 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
3133 return ::mprotect(bottom, size, prot) == 0; | |
3134 } | |
3135 | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3136 // Set protections specified |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3137 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
|
3138 bool is_committed) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3139 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3140 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3141 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3142 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3143 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3144 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
|
3145 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3146 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3147 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3148 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3149 return linux_mprotect(addr, bytes, p); |
0 | 3150 } |
3151 | |
3152 bool os::guard_memory(char* addr, size_t size) { | |
3153 return linux_mprotect(addr, size, PROT_NONE); | |
3154 } | |
3155 | |
3156 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
|
3157 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 3158 } |
3159 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3160 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
|
3161 bool result = false; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3162 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3163 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3164 -1, 0); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3165 |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3166 if (p != MAP_FAILED) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3167 // 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
|
3168 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3169 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3170 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3171 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3172 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3173 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3174 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3175 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3176 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3177 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3178 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3179 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3180 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3181 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3182 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3183 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3184 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3185 munmap (p, page_size); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3186 if (result) |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3187 return true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3188 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3189 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3190 if (warn) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3191 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3192 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3193 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3194 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3195 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3196 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3197 /* |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3198 * 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
|
3199 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3200 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3201 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3202 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3203 * - (bit 1) anonymous shared memory |
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3204 * - (bit 2) file-backed private memory |
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3205 * - (bit 3) file-backed shared memory |
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3206 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
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3207 * effective only if the bit 2 is cleared) |
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3208 * - (bit 5) hugetlb private memory |
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3209 * - (bit 6) hugetlb shared memory |
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3210 */ |
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|
3211 static void set_coredump_filter(void) { |
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|
3212 FILE *f; |
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|
3213 long cdm; |
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|
3214 |
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3215 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
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3216 return; |
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|
3217 } |
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|
3218 |
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3219 if (fscanf(f, "%lx", &cdm) != 1) { |
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|
3220 fclose(f); |
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|
3221 return; |
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|
3222 } |
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|
3223 |
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3224 rewind(f); |
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|
3225 |
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3226 if ((cdm & LARGEPAGES_BIT) == 0) { |
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3227 cdm |= LARGEPAGES_BIT; |
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3228 fprintf(f, "%#lx", cdm); |
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|
3229 } |
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3230 |
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3231 fclose(f); |
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|
3232 } |
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3233 |
0 | 3234 // Large page support |
3235 | |
3236 static size_t _large_page_size = 0; | |
3237 | |
3318
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3238 void os::large_page_init() { |
3286
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3239 if (!UseLargePages) { |
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3240 UseHugeTLBFS = false; |
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3241 UseSHM = false; |
3318
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3242 return; |
3286
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|
3243 } |
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3244 |
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3245 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { |
3318
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3246 // If UseLargePages is specified on the command line try both methods, |
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3247 // if it's default, then try only HugeTLBFS. |
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3248 if (FLAG_IS_DEFAULT(UseLargePages)) { |
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3249 UseHugeTLBFS = true; |
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3250 } else { |
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3251 UseHugeTLBFS = UseSHM = true; |
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3252 } |
3286
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3253 } |
0 | 3254 |
3255 if (LargePageSizeInBytes) { | |
3256 _large_page_size = LargePageSizeInBytes; | |
3257 } else { | |
3258 // large_page_size on Linux is used to round up heap size. x86 uses either | |
3259 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
3260 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
3261 // page as large as 256M. | |
3262 // | |
3263 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
3264 // for a line with the following format: | |
3265 // Hugepagesize: 2048 kB | |
3266 // | |
3267 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
3268 // format has been changed), we'll use the largest page size supported by | |
3269 // the processor. | |
3270 | |
1010 | 3271 #ifndef ZERO |
1681
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3272 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
126ea7725993
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3273 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3274 #endif // ZERO |
0 | 3275 |
3276 FILE *fp = fopen("/proc/meminfo", "r"); | |
3277 if (fp) { | |
3278 while (!feof(fp)) { | |
3279 int x = 0; | |
3280 char buf[16]; | |
3281 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
3282 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
3283 _large_page_size = x * K; | |
3284 break; | |
3285 } | |
3286 } else { | |
3287 // skip to next line | |
3288 for (;;) { | |
3289 int ch = fgetc(fp); | |
3290 if (ch == EOF || ch == (int)'\n') break; | |
3291 } | |
3292 } | |
3293 } | |
3294 fclose(fp); | |
3295 } | |
3296 } | |
3297 | |
3286
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|
3298 // print a warning if any large page related flag is specified on command line |
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3299 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
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3300 |
0 | 3301 const size_t default_page_size = (size_t)Linux::page_size(); |
3302 if (_large_page_size > default_page_size) { | |
3303 _page_sizes[0] = _large_page_size; | |
3304 _page_sizes[1] = default_page_size; | |
3305 _page_sizes[2] = 0; | |
3306 } | |
3286
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3307 UseHugeTLBFS = UseHugeTLBFS && |
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3308 Linux::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); |
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|
3309 |
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|
3310 if (UseHugeTLBFS) |
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|
3311 UseSHM = false; |
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|
3312 |
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3313 UseLargePages = UseHugeTLBFS || UseSHM; |
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|
3314 |
2204
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3315 set_coredump_filter(); |
0 | 3316 } |
3317 | |
3318 #ifndef SHM_HUGETLB | |
3319 #define SHM_HUGETLB 04000 | |
3320 #endif | |
3321 | |
656 | 3322 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { |
3323 // "exec" is passed in but not used. Creating the shared image for | |
3324 // the code cache doesn't have an SHM_X executable permission to check. | |
3286
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|
3325 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
0 | 3326 |
3327 key_t key = IPC_PRIVATE; | |
3328 char *addr; | |
3329 | |
3330 bool warn_on_failure = UseLargePages && | |
3331 (!FLAG_IS_DEFAULT(UseLargePages) || | |
3332 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
3333 ); | |
3334 char msg[128]; | |
3335 | |
3336 // Create a large shared memory region to attach to based on size. | |
3337 // Currently, size is the total size of the heap | |
3338 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
3339 if (shmid == -1) { | |
3340 // Possible reasons for shmget failure: | |
3341 // 1. shmmax is too small for Java heap. | |
3342 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
3343 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
3344 // 2. not enough large page memory. | |
3345 // > check available large pages: cat /proc/meminfo | |
3346 // > increase amount of large pages: | |
3347 // echo new_value > /proc/sys/vm/nr_hugepages | |
3348 // Note 1: different Linux may use different name for this property, | |
3349 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
3350 // Note 2: it's possible there's enough physical memory available but | |
3351 // they are so fragmented after a long run that they can't | |
3352 // coalesce into large pages. Try to reserve large pages when | |
3353 // the system is still "fresh". | |
3354 if (warn_on_failure) { | |
3355 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
3356 warning(msg); | |
3357 } | |
3358 return NULL; | |
3359 } | |
3360 | |
3361 // attach to the region | |
1537
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3362 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 3363 int err = errno; |
3364 | |
3365 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3366 // will be deleted when it's detached by shmdt() or when the process | |
3367 // terminates. If shmat() is not successful this will remove the shared | |
3368 // segment immediately. | |
3369 shmctl(shmid, IPC_RMID, NULL); | |
3370 | |
3371 if ((intptr_t)addr == -1) { | |
3372 if (warn_on_failure) { | |
3373 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
3374 warning(msg); | |
3375 } | |
3376 return NULL; | |
3377 } | |
3378 | |
3885 | 3379 if ((addr != NULL) && UseNUMAInterleaving) { |
3380 numa_make_global(addr, bytes); | |
3381 } | |
3382 | |
8711
6b803ba47588
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3383 // The memory is committed |
10986
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|
3384 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
8711
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|
3385 |
0 | 3386 return addr; |
3387 } | |
3388 | |
3389 bool os::release_memory_special(char* base, size_t bytes) { | |
10986
1f4355cee9a2
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|
3390 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
0 | 3391 // detaching the SHM segment will also delete it, see reserve_memory_special() |
3392 int rslt = shmdt(base); | |
8711
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|
3393 if (rslt == 0) { |
10986
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|
3394 tkr.record((address)base, bytes); |
8711
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|
3395 return true; |
6b803ba47588
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|
3396 } else { |
10986
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|
3397 tkr.discard(); |
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3398 return false; |
8711
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|
3399 } |
0 | 3400 } |
3401 | |
3402 size_t os::large_page_size() { | |
3403 return _large_page_size; | |
3404 } | |
3405 | |
3286
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3406 // HugeTLBFS allows application to commit large page memory on demand; |
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3407 // with SysV SHM the entire memory region must be allocated as shared |
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|
3408 // memory. |
0 | 3409 bool os::can_commit_large_page_memory() { |
3286
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3410 return UseHugeTLBFS; |
0 | 3411 } |
3412 | |
79
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|
3413 bool os::can_execute_large_page_memory() { |
3286
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|
3414 return UseHugeTLBFS; |
79
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|
3415 } |
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|
3416 |
0 | 3417 // Reserve memory at an arbitrary address, only if that area is |
3418 // available (and not reserved for something else). | |
3419 | |
6197 | 3420 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3421 const int max_tries = 10; |
3422 char* base[max_tries]; | |
3423 size_t size[max_tries]; | |
3424 const size_t gap = 0x000000; | |
3425 | |
3426 // Assert only that the size is a multiple of the page size, since | |
3427 // that's all that mmap requires, and since that's all we really know | |
3428 // about at this low abstraction level. If we need higher alignment, | |
3429 // we can either pass an alignment to this method or verify alignment | |
3430 // in one of the methods further up the call chain. See bug 5044738. | |
3431 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3432 | |
3433 // Repeatedly allocate blocks until the block is allocated at the | |
3434 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3435 // automatically update _highest_vm_reserved_address if the call is | |
3436 // successful. The variable tracks the highest memory address every reserved | |
3437 // by JVM. It is used to detect heap-stack collision if running with | |
3438 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3439 // space than needed, it could confuse the collision detecting code. To | |
3440 // solve the problem, save current _highest_vm_reserved_address and | |
3441 // calculate the correct value before return. | |
3442 address old_highest = _highest_vm_reserved_address; | |
3443 | |
3444 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3445 // if kernel honors the hint then we can return immediately. | |
3446 char * addr = anon_mmap(requested_addr, bytes, false); | |
3447 if (addr == requested_addr) { | |
3448 return requested_addr; | |
3449 } | |
3450 | |
3451 if (addr != NULL) { | |
3452 // mmap() is successful but it fails to reserve at the requested address | |
3453 anon_munmap(addr, bytes); | |
3454 } | |
3455 | |
3456 int i; | |
3457 for (i = 0; i < max_tries; ++i) { | |
3458 base[i] = reserve_memory(bytes); | |
3459 | |
3460 if (base[i] != NULL) { | |
3461 // Is this the block we wanted? | |
3462 if (base[i] == requested_addr) { | |
3463 size[i] = bytes; | |
3464 break; | |
3465 } | |
3466 | |
3467 // Does this overlap the block we wanted? Give back the overlapped | |
3468 // parts and try again. | |
3469 | |
3470 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3471 if (top_overlap >= 0 && top_overlap < bytes) { | |
3472 unmap_memory(base[i], top_overlap); | |
3473 base[i] += top_overlap; | |
3474 size[i] = bytes - top_overlap; | |
3475 } else { | |
3476 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3477 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3478 unmap_memory(requested_addr, bottom_overlap); | |
3479 size[i] = bytes - bottom_overlap; | |
3480 } else { | |
3481 size[i] = bytes; | |
3482 } | |
3483 } | |
3484 } | |
3485 } | |
3486 | |
3487 // Give back the unused reserved pieces. | |
3488 | |
3489 for (int j = 0; j < i; ++j) { | |
3490 if (base[j] != NULL) { | |
3491 unmap_memory(base[j], size[j]); | |
3492 } | |
3493 } | |
3494 | |
3495 if (i < max_tries) { | |
3496 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3497 return requested_addr; | |
3498 } else { | |
3499 _highest_vm_reserved_address = old_highest; | |
3500 return NULL; | |
3501 } | |
3502 } | |
3503 | |
3504 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3505 return ::read(fd, buf, nBytes); | |
3506 } | |
3507 | |
3508 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3509 // Solaris uses poll(), linux uses park(). | |
3510 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3511 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3512 // SIGSEGV, see 4355769. | |
3513 | |
3514 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3515 assert(thread == Thread::current(), "thread consistency check"); | |
3516 | |
3517 ParkEvent * const slp = thread->_SleepEvent ; | |
3518 slp->reset() ; | |
3519 OrderAccess::fence() ; | |
3520 | |
3521 if (interruptible) { | |
3522 jlong prevtime = javaTimeNanos(); | |
3523 | |
3524 for (;;) { | |
3525 if (os::is_interrupted(thread, true)) { | |
3526 return OS_INTRPT; | |
3527 } | |
3528 | |
3529 jlong newtime = javaTimeNanos(); | |
3530 | |
3531 if (newtime - prevtime < 0) { | |
3532 // time moving backwards, should only happen if no monotonic clock | |
3533 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3534 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3535 } else { | |
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|
3536 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3537 } |
3538 | |
3539 if(millis <= 0) { | |
3540 return OS_OK; | |
3541 } | |
3542 | |
3543 prevtime = newtime; | |
3544 | |
3545 { | |
3546 assert(thread->is_Java_thread(), "sanity check"); | |
3547 JavaThread *jt = (JavaThread *) thread; | |
3548 ThreadBlockInVM tbivm(jt); | |
3549 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3550 | |
3551 jt->set_suspend_equivalent(); | |
3552 // cleared by handle_special_suspend_equivalent_condition() or | |
3553 // java_suspend_self() via check_and_wait_while_suspended() | |
3554 | |
3555 slp->park(millis); | |
3556 | |
3557 // were we externally suspended while we were waiting? | |
3558 jt->check_and_wait_while_suspended(); | |
3559 } | |
3560 } | |
3561 } else { | |
3562 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3563 jlong prevtime = javaTimeNanos(); | |
3564 | |
3565 for (;;) { | |
3566 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3567 // the 1st iteration ... | |
3568 jlong newtime = javaTimeNanos(); | |
3569 | |
3570 if (newtime - prevtime < 0) { | |
3571 // time moving backwards, should only happen if no monotonic clock | |
3572 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3573 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3574 } else { | |
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3575 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3576 } |
3577 | |
3578 if(millis <= 0) break ; | |
3579 | |
3580 prevtime = newtime; | |
3581 slp->park(millis); | |
3582 } | |
3583 return OS_OK ; | |
3584 } | |
3585 } | |
3586 | |
3587 int os::naked_sleep() { | |
3588 // %% make the sleep time an integer flag. for now use 1 millisec. | |
3589 return os::sleep(Thread::current(), 1, false); | |
3590 } | |
3591 | |
3592 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3593 void os::infinite_sleep() { | |
3594 while (true) { // sleep forever ... | |
3595 ::sleep(100); // ... 100 seconds at a time | |
3596 } | |
3597 } | |
3598 | |
3599 // Used to convert frequent JVM_Yield() to nops | |
3600 bool os::dont_yield() { | |
3601 return DontYieldALot; | |
3602 } | |
3603 | |
3604 void os::yield() { | |
3605 sched_yield(); | |
3606 } | |
3607 | |
3608 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3609 | |
3610 void os::yield_all(int attempts) { | |
3611 // Yields to all threads, including threads with lower priorities | |
3612 // Threads on Linux are all with same priority. The Solaris style | |
3613 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3614 sched_yield(); | |
3615 } | |
3616 | |
3617 // Called from the tight loops to possibly influence time-sharing heuristics | |
3618 void os::loop_breaker(int attempts) { | |
3619 os::yield_all(attempts); | |
3620 } | |
3621 | |
3622 //////////////////////////////////////////////////////////////////////////////// | |
3623 // thread priority support | |
3624 | |
3625 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3626 // only supports dynamic priority, static priority must be zero. For real-time | |
3627 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3628 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3629 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3630 // of 5 runs - Sep 2005). | |
3631 // | |
3632 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3633 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3634 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3635 // threads. It has always been the case, but could change in the future. For | |
3636 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3637 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3638 | |
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3639 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3640 19, // 0 Entry should never be used |
3641 | |
3642 4, // 1 MinPriority | |
3643 3, // 2 | |
3644 2, // 3 | |
3645 | |
3646 1, // 4 | |
3647 0, // 5 NormPriority | |
3648 -1, // 6 | |
3649 | |
3650 -2, // 7 | |
3651 -3, // 8 | |
3652 -4, // 9 NearMaxPriority | |
3653 | |
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3654 -5, // 10 MaxPriority |
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3655 |
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3656 -5 // 11 CriticalPriority |
0 | 3657 }; |
3658 | |
3659 static int prio_init() { | |
3660 if (ThreadPriorityPolicy == 1) { | |
3661 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3662 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3663 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3664 if (geteuid() != 0) { | |
3665 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3666 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3667 } | |
3668 ThreadPriorityPolicy = 0; | |
3669 } | |
3670 } | |
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3671 if (UseCriticalJavaThreadPriority) { |
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3672 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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3673 } |
0 | 3674 return 0; |
3675 } | |
3676 | |
3677 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3678 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3679 | |
3680 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3681 return (ret == 0) ? OS_OK : OS_ERR; | |
3682 } | |
3683 | |
3684 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3685 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3686 *priority_ptr = java_to_os_priority[NormPriority]; | |
3687 return OS_OK; | |
3688 } | |
3689 | |
3690 errno = 0; | |
3691 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3692 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3693 } | |
3694 | |
3695 // Hint to the underlying OS that a task switch would not be good. | |
3696 // Void return because it's a hint and can fail. | |
3697 void os::hint_no_preempt() {} | |
3698 | |
3699 //////////////////////////////////////////////////////////////////////////////// | |
3700 // suspend/resume support | |
3701 | |
3702 // the low-level signal-based suspend/resume support is a remnant from the | |
3703 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3704 // within hotspot. Now there is a single use-case for this: | |
3705 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3706 // that runs in the watcher thread. | |
3707 // The remaining code is greatly simplified from the more general suspension | |
3708 // code that used to be used. | |
3709 // | |
3710 // The protocol is quite simple: | |
3711 // - suspend: | |
3712 // - sends a signal to the target thread | |
3713 // - polls the suspend state of the osthread using a yield loop | |
3714 // - target thread signal handler (SR_handler) sets suspend state | |
3715 // and blocks in sigsuspend until continued | |
3716 // - resume: | |
3717 // - sets target osthread state to continue | |
3718 // - sends signal to end the sigsuspend loop in the SR_handler | |
3719 // | |
3720 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3721 // | |
3722 | |
3723 static void resume_clear_context(OSThread *osthread) { | |
3724 osthread->set_ucontext(NULL); | |
3725 osthread->set_siginfo(NULL); | |
3726 } | |
3727 | |
3728 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
3729 osthread->set_ucontext(context); | |
3730 osthread->set_siginfo(siginfo); | |
3731 } | |
3732 | |
3733 // | |
3734 // Handler function invoked when a thread's execution is suspended or | |
3735 // resumed. We have to be careful that only async-safe functions are | |
3736 // called here (Note: most pthread functions are not async safe and | |
3737 // should be avoided.) | |
3738 // | |
3739 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
3740 // interface point of view, but sigwait() prevents the signal hander | |
3741 // from being run. libpthread would get very confused by not having | |
3742 // its signal handlers run and prevents sigwait()'s use with the | |
3743 // mutex granting granting signal. | |
3744 // | |
10405 | 3745 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
0 | 3746 // |
3747 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
3748 // Save and restore errno to avoid confusing native code with EINTR | |
3749 // after sigsuspend. | |
3750 int old_errno = errno; | |
3751 | |
3752 Thread* thread = Thread::current(); | |
3753 OSThread* osthread = thread->osthread(); | |
10405 | 3754 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
3755 | |
3756 os::SuspendResume::State current = osthread->sr.state(); | |
3757 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
0 | 3758 suspend_save_context(osthread, siginfo, context); |
3759 | |
10405 | 3760 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
3761 os::SuspendResume::State state = osthread->sr.suspended(); | |
3762 if (state == os::SuspendResume::SR_SUSPENDED) { | |
3763 sigset_t suspend_set; // signals for sigsuspend() | |
3764 | |
3765 // get current set of blocked signals and unblock resume signal | |
3766 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
3767 sigdelset(&suspend_set, SR_signum); | |
3768 | |
3769 sr_semaphore.signal(); | |
3770 // wait here until we are resumed | |
3771 while (1) { | |
3772 sigsuspend(&suspend_set); | |
3773 | |
3774 os::SuspendResume::State result = osthread->sr.running(); | |
3775 if (result == os::SuspendResume::SR_RUNNING) { | |
3776 sr_semaphore.signal(); | |
3777 break; | |
3778 } | |
3779 } | |
3780 | |
3781 } else if (state == os::SuspendResume::SR_RUNNING) { | |
3782 // request was cancelled, continue | |
3783 } else { | |
3784 ShouldNotReachHere(); | |
3785 } | |
0 | 3786 |
3787 resume_clear_context(osthread); | |
10405 | 3788 } else if (current == os::SuspendResume::SR_RUNNING) { |
3789 // request was cancelled, continue | |
3790 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3791 // ignore | |
0 | 3792 } else { |
10405 | 3793 // ignore |
0 | 3794 } |
3795 | |
3796 errno = old_errno; | |
3797 } | |
3798 | |
3799 | |
3800 static int SR_initialize() { | |
3801 struct sigaction act; | |
3802 char *s; | |
3803 /* Get signal number to use for suspend/resume */ | |
3804 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
3805 int sig = ::strtol(s, 0, 10); | |
3806 if (sig > 0 || sig < _NSIG) { | |
3807 SR_signum = sig; | |
3808 } | |
3809 } | |
3810 | |
3811 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
3812 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
3813 | |
3814 sigemptyset(&SR_sigset); | |
3815 sigaddset(&SR_sigset, SR_signum); | |
3816 | |
3817 /* Set up signal handler for suspend/resume */ | |
3818 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
3819 act.sa_handler = (void (*)(int)) SR_handler; | |
3820 | |
3821 // SR_signum is blocked by default. | |
3822 // 4528190 - We also need to block pthread restart signal (32 on all | |
3823 // supported Linux platforms). Note that LinuxThreads need to block | |
3824 // this signal for all threads to work properly. So we don't have | |
3825 // to use hard-coded signal number when setting up the mask. | |
3826 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
3827 | |
3828 if (sigaction(SR_signum, &act, 0) == -1) { | |
3829 return -1; | |
3830 } | |
3831 | |
3832 // Save signal flag | |
3833 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
3834 return 0; | |
3835 } | |
3836 | |
10405 | 3837 static int sr_notify(OSThread* osthread) { |
3838 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3839 assert_status(status == 0, status, "pthread_kill"); | |
3840 return status; | |
3841 } | |
3842 | |
3843 // "Randomly" selected value for how long we want to spin | |
3844 // before bailing out on suspending a thread, also how often | |
3845 // we send a signal to a thread we want to resume | |
3846 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
3847 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
0 | 3848 |
3849 // returns true on success and false on error - really an error is fatal | |
3850 // but this seems the normal response to library errors | |
3851 static bool do_suspend(OSThread* osthread) { | |
10405 | 3852 assert(osthread->sr.is_running(), "thread should be running"); |
3853 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
3854 | |
0 | 3855 // mark as suspended and send signal |
10405 | 3856 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
3857 // failed to switch, state wasn't running? | |
3858 ShouldNotReachHere(); | |
3859 return false; | |
3860 } | |
3861 | |
3862 if (sr_notify(osthread) != 0) { | |
3863 ShouldNotReachHere(); | |
3864 } | |
3865 | |
3866 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
3867 while (true) { | |
3868 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3869 break; | |
3870 } else { | |
3871 // timeout | |
3872 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
3873 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
3874 return false; | |
3875 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
3876 // make sure that we consume the signal on the semaphore as well | |
3877 sr_semaphore.wait(); | |
3878 break; | |
3879 } else { | |
3880 ShouldNotReachHere(); | |
3881 return false; | |
3882 } | |
0 | 3883 } |
10405 | 3884 } |
3885 | |
3886 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
3887 return true; | |
0 | 3888 } |
3889 | |
3890 static void do_resume(OSThread* osthread) { | |
3891 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 3892 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
3893 | |
3894 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3895 // failed to switch to WAKEUP_REQUEST | |
3896 ShouldNotReachHere(); | |
3897 return; | |
3898 } | |
3899 | |
3900 while (true) { | |
3901 if (sr_notify(osthread) == 0) { | |
3902 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3903 if (osthread->sr.is_running()) { | |
3904 return; | |
3905 } | |
3906 } | |
3907 } else { | |
3908 ShouldNotReachHere(); | |
0 | 3909 } |
3910 } | |
10405 | 3911 |
3912 guarantee(osthread->sr.is_running(), "Must be running!"); | |
0 | 3913 } |
3914 | |
3915 //////////////////////////////////////////////////////////////////////////////// | |
3916 // interrupt support | |
3917 | |
3918 void os::interrupt(Thread* thread) { | |
3919 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3920 "possibility of dangling Thread pointer"); | |
3921 | |
3922 OSThread* osthread = thread->osthread(); | |
3923 | |
3924 if (!osthread->interrupted()) { | |
3925 osthread->set_interrupted(true); | |
3926 // More than one thread can get here with the same value of osthread, | |
3927 // resulting in multiple notifications. We do, however, want the store | |
3928 // to interrupted() to be visible to other threads before we execute unpark(). | |
3929 OrderAccess::fence(); | |
3930 ParkEvent * const slp = thread->_SleepEvent ; | |
3931 if (slp != NULL) slp->unpark() ; | |
3932 } | |
3933 | |
3934 // For JSR166. Unpark even if interrupt status already was set | |
3935 if (thread->is_Java_thread()) | |
3936 ((JavaThread*)thread)->parker()->unpark(); | |
3937 | |
3938 ParkEvent * ev = thread->_ParkEvent ; | |
3939 if (ev != NULL) ev->unpark() ; | |
3940 | |
3941 } | |
3942 | |
3943 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3944 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3945 "possibility of dangling Thread pointer"); | |
3946 | |
3947 OSThread* osthread = thread->osthread(); | |
3948 | |
3949 bool interrupted = osthread->interrupted(); | |
3950 | |
3951 if (interrupted && clear_interrupted) { | |
3952 osthread->set_interrupted(false); | |
3953 // consider thread->_SleepEvent->reset() ... optional optimization | |
3954 } | |
3955 | |
3956 return interrupted; | |
3957 } | |
3958 | |
3959 /////////////////////////////////////////////////////////////////////////////////// | |
3960 // signal handling (except suspend/resume) | |
3961 | |
3962 // This routine may be used by user applications as a "hook" to catch signals. | |
3963 // The user-defined signal handler must pass unrecognized signals to this | |
3964 // routine, and if it returns true (non-zero), then the signal handler must | |
3965 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3966 // routine will never retun false (zero), but instead will execute a VM panic | |
3967 // routine kill the process. | |
3968 // | |
3969 // If this routine returns false, it is OK to call it again. This allows | |
3970 // the user-defined signal handler to perform checks either before or after | |
3971 // the VM performs its own checks. Naturally, the user code would be making | |
3972 // a serious error if it tried to handle an exception (such as a null check | |
3973 // or breakpoint) that the VM was generating for its own correct operation. | |
3974 // | |
3975 // This routine may recognize any of the following kinds of signals: | |
3976 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3977 // It should be consulted by handlers for any of those signals. | |
3978 // | |
3979 // The caller of this routine must pass in the three arguments supplied | |
3980 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3981 // field of the structure passed to sigaction(). This routine assumes that | |
3982 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3983 // | |
3984 // Note that the VM will print warnings if it detects conflicting signal | |
3985 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3986 // | |
2191 | 3987 extern "C" JNIEXPORT int |
0 | 3988 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
3989 void* ucontext, int abort_if_unrecognized); | |
3990 | |
3991 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3992 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3993 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 3994 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 3995 errno = orig_errno; |
0 | 3996 } |
3997 | |
3998 | |
3999 // This boolean allows users to forward their own non-matching signals | |
4000 // to JVM_handle_linux_signal, harmlessly. | |
4001 bool os::Linux::signal_handlers_are_installed = false; | |
4002 | |
4003 // For signal-chaining | |
4004 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
4005 unsigned int os::Linux::sigs = 0; | |
4006 bool os::Linux::libjsig_is_loaded = false; | |
4007 typedef struct sigaction *(*get_signal_t)(int); | |
4008 get_signal_t os::Linux::get_signal_action = NULL; | |
4009 | |
4010 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
4011 struct sigaction *actp = NULL; | |
4012 | |
4013 if (libjsig_is_loaded) { | |
4014 // Retrieve the old signal handler from libjsig | |
4015 actp = (*get_signal_action)(sig); | |
4016 } | |
4017 if (actp == NULL) { | |
4018 // Retrieve the preinstalled signal handler from jvm | |
4019 actp = get_preinstalled_handler(sig); | |
4020 } | |
4021 | |
4022 return actp; | |
4023 } | |
4024 | |
4025 static bool call_chained_handler(struct sigaction *actp, int sig, | |
4026 siginfo_t *siginfo, void *context) { | |
4027 // Call the old signal handler | |
4028 if (actp->sa_handler == SIG_DFL) { | |
4029 // It's more reasonable to let jvm treat it as an unexpected exception | |
4030 // instead of taking the default action. | |
4031 return false; | |
4032 } else if (actp->sa_handler != SIG_IGN) { | |
4033 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
4034 // automaticlly block the signal | |
4035 sigaddset(&(actp->sa_mask), sig); | |
4036 } | |
4037 | |
4038 sa_handler_t hand; | |
4039 sa_sigaction_t sa; | |
4040 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
4041 // retrieve the chained handler | |
4042 if (siginfo_flag_set) { | |
4043 sa = actp->sa_sigaction; | |
4044 } else { | |
4045 hand = actp->sa_handler; | |
4046 } | |
4047 | |
4048 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
4049 actp->sa_handler = SIG_DFL; | |
4050 } | |
4051 | |
4052 // try to honor the signal mask | |
4053 sigset_t oset; | |
4054 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
4055 | |
4056 // call into the chained handler | |
4057 if (siginfo_flag_set) { | |
4058 (*sa)(sig, siginfo, context); | |
4059 } else { | |
4060 (*hand)(sig); | |
4061 } | |
4062 | |
4063 // restore the signal mask | |
4064 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
4065 } | |
4066 // Tell jvm's signal handler the signal is taken care of. | |
4067 return true; | |
4068 } | |
4069 | |
4070 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
4071 bool chained = false; | |
4072 // signal-chaining | |
4073 if (UseSignalChaining) { | |
4074 struct sigaction *actp = get_chained_signal_action(sig); | |
4075 if (actp != NULL) { | |
4076 chained = call_chained_handler(actp, sig, siginfo, context); | |
4077 } | |
4078 } | |
4079 return chained; | |
4080 } | |
4081 | |
4082 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
4083 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
4084 return &sigact[sig]; | |
4085 } | |
4086 return NULL; | |
4087 } | |
4088 | |
4089 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
4090 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4091 sigact[sig] = oldAct; | |
4092 sigs |= (unsigned int)1 << sig; | |
4093 } | |
4094 | |
4095 // for diagnostic | |
4096 int os::Linux::sigflags[MAXSIGNUM]; | |
4097 | |
4098 int os::Linux::get_our_sigflags(int sig) { | |
4099 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4100 return sigflags[sig]; | |
4101 } | |
4102 | |
4103 void os::Linux::set_our_sigflags(int sig, int flags) { | |
4104 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4105 sigflags[sig] = flags; | |
4106 } | |
4107 | |
4108 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
4109 // Check for overwrite. | |
4110 struct sigaction oldAct; | |
4111 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
4112 | |
4113 void* oldhand = oldAct.sa_sigaction | |
4114 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4115 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4116 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
4117 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
4118 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
4119 if (AllowUserSignalHandlers || !set_installed) { | |
4120 // Do not overwrite; user takes responsibility to forward to us. | |
4121 return; | |
4122 } else if (UseSignalChaining) { | |
4123 // save the old handler in jvm | |
4124 save_preinstalled_handler(sig, oldAct); | |
4125 // libjsig also interposes the sigaction() call below and saves the | |
4126 // old sigaction on it own. | |
4127 } else { | |
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4128 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
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4129 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 4130 } |
4131 } | |
4132 | |
4133 struct sigaction sigAct; | |
4134 sigfillset(&(sigAct.sa_mask)); | |
4135 sigAct.sa_handler = SIG_DFL; | |
4136 if (!set_installed) { | |
4137 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4138 } else { | |
4139 sigAct.sa_sigaction = signalHandler; | |
4140 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
4141 } | |
4142 // Save flags, which are set by ours | |
4143 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
4144 sigflags[sig] = sigAct.sa_flags; | |
4145 | |
4146 int ret = sigaction(sig, &sigAct, &oldAct); | |
4147 assert(ret == 0, "check"); | |
4148 | |
4149 void* oldhand2 = oldAct.sa_sigaction | |
4150 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
4151 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
4152 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
4153 } | |
4154 | |
4155 // install signal handlers for signals that HotSpot needs to | |
4156 // handle in order to support Java-level exception handling. | |
4157 | |
4158 void os::Linux::install_signal_handlers() { | |
4159 if (!signal_handlers_are_installed) { | |
4160 signal_handlers_are_installed = true; | |
4161 | |
4162 // signal-chaining | |
4163 typedef void (*signal_setting_t)(); | |
4164 signal_setting_t begin_signal_setting = NULL; | |
4165 signal_setting_t end_signal_setting = NULL; | |
4166 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4167 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
4168 if (begin_signal_setting != NULL) { | |
4169 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
4170 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
4171 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
4172 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
4173 libjsig_is_loaded = true; | |
4174 assert(UseSignalChaining, "should enable signal-chaining"); | |
4175 } | |
4176 if (libjsig_is_loaded) { | |
4177 // Tell libjsig jvm is setting signal handlers | |
4178 (*begin_signal_setting)(); | |
4179 } | |
4180 | |
4181 set_signal_handler(SIGSEGV, true); | |
4182 set_signal_handler(SIGPIPE, true); | |
4183 set_signal_handler(SIGBUS, true); | |
4184 set_signal_handler(SIGILL, true); | |
4185 set_signal_handler(SIGFPE, true); | |
4186 set_signal_handler(SIGXFSZ, true); | |
4187 | |
4188 if (libjsig_is_loaded) { | |
4189 // Tell libjsig jvm finishes setting signal handlers | |
4190 (*end_signal_setting)(); | |
4191 } | |
4192 | |
4193 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
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4194 // and if UserSignalHandler is installed all bets are off. |
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4195 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 4196 if (CheckJNICalls) { |
4197 if (libjsig_is_loaded) { | |
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4198 if (PrintJNIResolving) { |
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4199 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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4200 } |
0 | 4201 check_signals = false; |
4202 } | |
4203 if (AllowUserSignalHandlers) { | |
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4204 if (PrintJNIResolving) { |
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4205 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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4206 } |
0 | 4207 check_signals = false; |
4208 } | |
4209 } | |
4210 } | |
4211 } | |
4212 | |
4213 // This is the fastest way to get thread cpu time on Linux. | |
4214 // Returns cpu time (user+sys) for any thread, not only for current. | |
4215 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
4216 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4217 // For reference, please, see IEEE Std 1003.1-2004: | |
4218 // http://www.unix.org/single_unix_specification | |
4219 | |
4220 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4221 struct timespec tp; | |
4222 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4223 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4224 | |
4712
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4225 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4226 } |
4227 | |
4228 ///// | |
4229 // glibc on Linux platform uses non-documented flag | |
4230 // to indicate, that some special sort of signal | |
4231 // trampoline is used. | |
4232 // We will never set this flag, and we should | |
4233 // ignore this flag in our diagnostic | |
4234 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4235 #undef SIGNIFICANT_SIGNAL_MASK | |
4236 #endif | |
4237 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4238 | |
4239 static const char* get_signal_handler_name(address handler, | |
4240 char* buf, int buflen) { | |
4241 int offset; | |
4242 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
4243 if (found) { | |
4244 // skip directory names | |
4245 const char *p1, *p2; | |
4246 p1 = buf; | |
4247 size_t len = strlen(os::file_separator()); | |
4248 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4249 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4250 } else { | |
4251 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4252 } | |
4253 return buf; | |
4254 } | |
4255 | |
4256 static void print_signal_handler(outputStream* st, int sig, | |
4257 char* buf, size_t buflen) { | |
4258 struct sigaction sa; | |
4259 | |
4260 sigaction(sig, NULL, &sa); | |
4261 | |
4262 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4263 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4264 | |
4265 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4266 | |
4267 address handler = (sa.sa_flags & SA_SIGINFO) | |
4268 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4269 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4270 | |
4271 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4272 st->print("SIG_DFL"); | |
4273 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4274 st->print("SIG_IGN"); | |
4275 } else { | |
4276 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4277 } | |
4278 | |
4279 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
4280 | |
4281 address rh = VMError::get_resetted_sighandler(sig); | |
4282 // May be, handler was resetted by VMError? | |
4283 if(rh != NULL) { | |
4284 handler = rh; | |
4285 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4286 } | |
4287 | |
4288 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
4289 | |
4290 // Check: is it our handler? | |
4291 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4292 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4293 // It is our signal handler | |
4294 // check for flags, reset system-used one! | |
4295 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4296 st->print( | |
4297 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4298 os::Linux::get_our_sigflags(sig)); | |
4299 } | |
4300 } | |
4301 st->cr(); | |
4302 } | |
4303 | |
4304 | |
4305 #define DO_SIGNAL_CHECK(sig) \ | |
4306 if (!sigismember(&check_signal_done, sig)) \ | |
4307 os::Linux::check_signal_handler(sig) | |
4308 | |
4309 // This method is a periodic task to check for misbehaving JNI applications | |
4310 // under CheckJNI, we can add any periodic checks here | |
4311 | |
4312 void os::run_periodic_checks() { | |
4313 | |
4314 if (check_signals == false) return; | |
4315 | |
4316 // SEGV and BUS if overridden could potentially prevent | |
4317 // generation of hs*.log in the event of a crash, debugging | |
4318 // such a case can be very challenging, so we absolutely | |
4319 // check the following for a good measure: | |
4320 DO_SIGNAL_CHECK(SIGSEGV); | |
4321 DO_SIGNAL_CHECK(SIGILL); | |
4322 DO_SIGNAL_CHECK(SIGFPE); | |
4323 DO_SIGNAL_CHECK(SIGBUS); | |
4324 DO_SIGNAL_CHECK(SIGPIPE); | |
4325 DO_SIGNAL_CHECK(SIGXFSZ); | |
4326 | |
4327 | |
4328 // ReduceSignalUsage allows the user to override these handlers | |
4329 // see comments at the very top and jvm_solaris.h | |
4330 if (!ReduceSignalUsage) { | |
4331 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4332 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4333 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4334 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4335 } | |
4336 | |
4337 DO_SIGNAL_CHECK(SR_signum); | |
4338 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4339 } | |
4340 | |
4341 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4342 | |
4343 static os_sigaction_t os_sigaction = NULL; | |
4344 | |
4345 void os::Linux::check_signal_handler(int sig) { | |
4346 char buf[O_BUFLEN]; | |
4347 address jvmHandler = NULL; | |
4348 | |
4349 | |
4350 struct sigaction act; | |
4351 if (os_sigaction == NULL) { | |
4352 // only trust the default sigaction, in case it has been interposed | |
4353 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4354 if (os_sigaction == NULL) return; | |
4355 } | |
4356 | |
4357 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4358 | |
4359 | |
4360 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4361 | |
4362 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4363 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4364 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4365 | |
4366 | |
4367 switch(sig) { | |
4368 case SIGSEGV: | |
4369 case SIGBUS: | |
4370 case SIGFPE: | |
4371 case SIGPIPE: | |
4372 case SIGILL: | |
4373 case SIGXFSZ: | |
4374 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4375 break; | |
4376 | |
4377 case SHUTDOWN1_SIGNAL: | |
4378 case SHUTDOWN2_SIGNAL: | |
4379 case SHUTDOWN3_SIGNAL: | |
4380 case BREAK_SIGNAL: | |
4381 jvmHandler = (address)user_handler(); | |
4382 break; | |
4383 | |
4384 case INTERRUPT_SIGNAL: | |
4385 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4386 break; | |
4387 | |
4388 default: | |
4389 if (sig == SR_signum) { | |
4390 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4391 } else { | |
4392 return; | |
4393 } | |
4394 break; | |
4395 } | |
4396 | |
4397 if (thisHandler != jvmHandler) { | |
4398 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4399 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4400 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4401 // No need to check this sig any longer | |
4402 sigaddset(&check_signal_done, sig); | |
4403 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4404 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4405 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4406 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4407 // No need to check this sig any longer | |
4408 sigaddset(&check_signal_done, sig); | |
4409 } | |
4410 | |
4411 // Dump all the signal | |
4412 if (sigismember(&check_signal_done, sig)) { | |
4413 print_signal_handlers(tty, buf, O_BUFLEN); | |
4414 } | |
4415 } | |
4416 | |
4417 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4418 | |
4419 extern bool signal_name(int signo, char* buf, size_t len); | |
4420 | |
4421 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4422 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4423 // signal | |
4424 if (!signal_name(exception_code, buf, size)) { | |
4425 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4426 } | |
4427 return buf; | |
4428 } else { | |
4429 return NULL; | |
4430 } | |
4431 } | |
4432 | |
4433 // this is called _before_ the most of global arguments have been parsed | |
4434 void os::init(void) { | |
4435 char dummy; /* used to get a guess on initial stack address */ | |
4436 // first_hrtime = gethrtime(); | |
4437 | |
4438 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4439 // is different than the pid of the java launcher thread. | |
4440 // So, on Linux, the launcher thread pid is passed to the VM | |
4441 // via the sun.java.launcher.pid property. | |
4442 // Use this property instead of getpid() if it was correctly passed. | |
4443 // See bug 6351349. | |
4444 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4445 | |
4446 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4447 | |
4448 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4449 | |
4450 init_random(1234567); | |
4451 | |
4452 ThreadCritical::initialize(); | |
4453 | |
4454 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4455 if (Linux::page_size() == -1) { | |
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4456 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
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4457 strerror(errno))); |
0 | 4458 } |
4459 init_page_sizes((size_t) Linux::page_size()); | |
4460 | |
4461 Linux::initialize_system_info(); | |
4462 | |
4463 // main_thread points to the aboriginal thread | |
4464 Linux::_main_thread = pthread_self(); | |
4465 | |
4466 Linux::clock_init(); | |
4467 initial_time_count = os::elapsed_counter(); | |
242 | 4468 pthread_mutex_init(&dl_mutex, NULL); |
10164
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4469 |
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4470 // If the pagesize of the VM is greater than 8K determine the appropriate |
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4471 // number of initial guard pages. The user can change this with the |
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changeset
|
4472 // 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
|
4473 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
|
4474 StackYellowPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4475 StackRedPages = 1; |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4476 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4477 } |
0 | 4478 } |
4479 | |
4480 // To install functions for atexit system call | |
4481 extern "C" { | |
4482 static void perfMemory_exit_helper() { | |
4483 perfMemory_exit(); | |
4484 } | |
4485 } | |
4486 | |
4487 // this is called _after_ the global arguments have been parsed | |
4488 jint os::init_2(void) | |
4489 { | |
4490 Linux::fast_thread_clock_init(); | |
4491 | |
4492 // Allocate a single page and mark it as readable for safepoint polling | |
4493 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4494 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4495 | |
4496 os::set_polling_page( polling_page ); | |
4497 | |
4498 #ifndef PRODUCT | |
4499 if(Verbose && PrintMiscellaneous) | |
4500 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4501 #endif | |
4502 | |
4503 if (!UseMembar) { | |
4504 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
|
4505 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
0 | 4506 os::set_memory_serialize_page( mem_serialize_page ); |
4507 | |
4508 #ifndef PRODUCT | |
4509 if(Verbose && PrintMiscellaneous) | |
4510 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4511 #endif | |
4512 } | |
4513 | |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
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diff
changeset
|
4514 os::large_page_init(); |
0 | 4515 |
4516 // initialize suspend/resume support - must do this before signal_sets_init() | |
4517 if (SR_initialize() != 0) { | |
4518 perror("SR_initialize failed"); | |
4519 return JNI_ERR; | |
4520 } | |
4521 | |
4522 Linux::signal_sets_init(); | |
4523 Linux::install_signal_handlers(); | |
4524 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4525 // 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
|
4526 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4527 // 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
|
4528 // 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
|
4529 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4530 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
|
4531 (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
|
4532 (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
|
4533 |
0 | 4534 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4535 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4536 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4537 tty->print_cr("\nThe stack size specified is too small, " |
4538 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4539 os::Linux::min_stack_allowed/ K); |
0 | 4540 return JNI_ERR; |
4541 } | |
4542 | |
4543 // Make the stack size a multiple of the page size so that | |
4544 // the yellow/red zones can be guarded. | |
4545 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4546 vm_page_size())); | |
4547 | |
4548 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4549 | |
4550 Linux::libpthread_init(); | |
4551 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4552 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4553 Linux::glibc_version(), Linux::libpthread_version(), | |
4554 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4555 } | |
4556 | |
141 | 4557 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4558 if (!Linux::libnuma_init()) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
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diff
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|
4559 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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356
diff
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|
4560 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4561 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
|
4562 // 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()
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diff
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|
4563 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
4564 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
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|
4565 } |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4566 // With SHM large pages we cannot uncommit a page, so there's not way |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4567 // we can make the adaptive lgrp chunk resizing work. If the user specified |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4568 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4569 // disable adaptive resizing. |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4570 if (UseNUMA && UseLargePages && UseSHM) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4571 if (!FLAG_IS_DEFAULT(UseNUMA)) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4572 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4573 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4574 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4575 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4576 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4577 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4578 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4579 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4580 UseNUMA = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4581 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4582 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4583 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4584 UseNUMA = true; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4585 } |
141 | 4586 } |
4587 | |
0 | 4588 if (MaxFDLimit) { |
4589 // set the number of file descriptors to max. print out error | |
4590 // if getrlimit/setrlimit fails but continue regardless. | |
4591 struct rlimit nbr_files; | |
4592 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4593 if (status != 0) { | |
4594 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4595 perror("os::init_2 getrlimit failed"); | |
4596 } else { | |
4597 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4598 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4599 if (status != 0) { | |
4600 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4601 perror("os::init_2 setrlimit failed"); | |
4602 } | |
4603 } | |
4604 } | |
4605 | |
4606 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4607 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4608 | |
4609 // at-exit methods are called in the reverse order of their registration. | |
4610 // atexit functions are called on return from main or as a result of a | |
4611 // call to exit(3C). There can be only 32 of these functions registered | |
4612 // and atexit() does not set errno. | |
4613 | |
4614 if (PerfAllowAtExitRegistration) { | |
4615 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4616 // atexit functions can be delayed until process exit time, which | |
4617 // can be problematic for embedded VM situations. Embedded VMs should | |
4618 // call DestroyJavaVM() to assure that VM resources are released. | |
4619 | |
4620 // note: perfMemory_exit_helper atexit function may be removed in | |
4621 // the future if the appropriate cleanup code can be added to the | |
4622 // VM_Exit VMOperation's doit method. | |
4623 if (atexit(perfMemory_exit_helper) != 0) { | |
4624 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
4625 } | |
4626 } | |
4627 | |
4628 // initialize thread priority policy | |
4629 prio_init(); | |
4630 | |
4631 return JNI_OK; | |
4632 } | |
4633 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4634 // this is called at the end of vm_initialization |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4635 void os::init_3(void) |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4636 { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4637 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4638 // Start the MemNotifyThread |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4639 if (LowMemoryProtection) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4640 MemNotifyThread::start(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4641 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4642 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4643 #endif |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4644 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4645 |
0 | 4646 // Mark the polling page as unreadable |
4647 void os::make_polling_page_unreadable(void) { | |
4648 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4649 fatal("Could not disable polling page"); | |
4650 }; | |
4651 | |
4652 // Mark the polling page as readable | |
4653 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4654 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4655 fatal("Could not enable polling page"); |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
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235
diff
changeset
|
4656 } |
0 | 4657 }; |
4658 | |
4659 int os::active_processor_count() { | |
4660 // Linux doesn't yet have a (official) notion of processor sets, | |
4661 // so just return the number of online processors. | |
4662 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4663 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4664 return online_cpus; | |
4665 } | |
4666 | |
4006 | 4667 void os::set_native_thread_name(const char *name) { |
4668 // Not yet implemented. | |
4669 return; | |
4670 } | |
4671 | |
0 | 4672 bool os::distribute_processes(uint length, uint* distribution) { |
4673 // Not yet implemented. | |
4674 return false; | |
4675 } | |
4676 | |
4677 bool os::bind_to_processor(uint processor_id) { | |
4678 // Not yet implemented. | |
4679 return false; | |
4680 } | |
4681 | |
4682 /// | |
4683 | |
10405 | 4684 void os::SuspendedThreadTask::internal_do_task() { |
4685 if (do_suspend(_thread->osthread())) { | |
4686 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
4687 do_task(context); | |
4688 do_resume(_thread->osthread()); | |
4689 } | |
4690 } | |
4691 | |
4692 class PcFetcher : public os::SuspendedThreadTask { | |
4693 public: | |
4694 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
4695 ExtendedPC result(); | |
4696 protected: | |
4697 void do_task(const os::SuspendedThreadTaskContext& context); | |
4698 private: | |
4699 ExtendedPC _epc; | |
4700 }; | |
4701 | |
4702 ExtendedPC PcFetcher::result() { | |
4703 guarantee(is_done(), "task is not done yet."); | |
4704 return _epc; | |
4705 } | |
4706 | |
4707 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
4708 Thread* thread = context.thread(); | |
4709 OSThread* osthread = thread->osthread(); | |
4710 if (osthread->ucontext() != NULL) { | |
4711 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
4712 } else { | |
4713 // NULL context is unexpected, double-check this is the VMThread | |
4714 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
4715 } | |
4716 } | |
4717 | |
0 | 4718 // Suspends the target using the signal mechanism and then grabs the PC before |
4719 // resuming the target. Used by the flat-profiler only | |
4720 ExtendedPC os::get_thread_pc(Thread* thread) { | |
4721 // Make sure that it is called by the watcher for the VMThread | |
4722 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
4723 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
4724 | |
10405 | 4725 PcFetcher fetcher(thread); |
4726 fetcher.run(); | |
4727 return fetcher.result(); | |
0 | 4728 } |
4729 | |
4730 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
4731 { | |
4732 if (is_NPTL()) { | |
4733 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4734 } else { | |
4735 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
4736 // word back to default 64bit precision if condvar is signaled. Java | |
4737 // wants 53bit precision. Save and restore current value. | |
4738 int fpu = get_fpu_control_word(); | |
4739 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4740 set_fpu_control_word(fpu); | |
4741 return status; | |
4742 } | |
4743 } | |
4744 | |
4745 //////////////////////////////////////////////////////////////////////////////// | |
4746 // debug support | |
4747 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1642
diff
changeset
|
4748 bool os::find(address addr, outputStream* st) { |
0 | 4749 Dl_info dlinfo; |
4750 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
|
4751 if (dladdr(addr, &dlinfo) != 0) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4752 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
|
4753 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4754 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 4755 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
|
4756 } else if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4757 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 4758 } else { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4759 st->print("<absolute address>"); |
0 | 4760 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4761 if (dlinfo.dli_fname != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4762 st->print(" in %s", dlinfo.dli_fname); |
0 | 4763 } |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4764 if (dlinfo.dli_fbase != NULL) { |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4765 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 4766 } |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4767 st->cr(); |
0 | 4768 |
4769 if (Verbose) { | |
4770 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4771 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
|
4772 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 4773 address lowest = (address) dlinfo.dli_sname; |
4774 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
4775 if (begin < lowest) begin = lowest; | |
4776 Dl_info dlinfo2; | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4777 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
0 | 4778 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
4779 end = (address) dlinfo2.dli_saddr; | |
1681
126ea7725993
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bobv
parents:
1642
diff
changeset
|
4780 Disassembler::decode(begin, end, st); |
0 | 4781 } |
4782 return true; | |
4783 } | |
4784 return false; | |
4785 } | |
4786 | |
4787 //////////////////////////////////////////////////////////////////////////////// | |
4788 // misc | |
4789 | |
4790 // This does not do anything on Linux. This is basically a hook for being | |
4791 // able to use structured exception handling (thread-local exception filters) | |
4792 // on, e.g., Win32. | |
4793 void | |
4794 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
4795 JavaCallArguments* args, Thread* thread) { | |
4796 f(value, method, args, thread); | |
4797 } | |
4798 | |
4799 void os::print_statistics() { | |
4800 } | |
4801 | |
4802 int os::message_box(const char* title, const char* message) { | |
4803 int i; | |
4804 fdStream err(defaultStream::error_fd()); | |
4805 for (i = 0; i < 78; i++) err.print_raw("="); | |
4806 err.cr(); | |
4807 err.print_raw_cr(title); | |
4808 for (i = 0; i < 78; i++) err.print_raw("-"); | |
4809 err.cr(); | |
4810 err.print_raw_cr(message); | |
4811 for (i = 0; i < 78; i++) err.print_raw("="); | |
4812 err.cr(); | |
4813 | |
4814 char buf[16]; | |
4815 // Prevent process from exiting upon "read error" without consuming all CPU | |
4816 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
4817 | |
4818 return buf[0] == 'y' || buf[0] == 'Y'; | |
4819 } | |
4820 | |
4821 int os::stat(const char *path, struct stat *sbuf) { | |
4822 char pathbuf[MAX_PATH]; | |
4823 if (strlen(path) > MAX_PATH - 1) { | |
4824 errno = ENAMETOOLONG; | |
4825 return -1; | |
4826 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4827 os::native_path(strcpy(pathbuf, path)); |
0 | 4828 return ::stat(pathbuf, sbuf); |
4829 } | |
4830 | |
4831 bool os::check_heap(bool force) { | |
4832 return true; | |
4833 } | |
4834 | |
4835 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
4836 return ::vsnprintf(buf, count, format, args); | |
4837 } | |
4838 | |
4839 // Is a (classpath) directory empty? | |
4840 bool os::dir_is_empty(const char* path) { | |
4841 DIR *dir = NULL; | |
4842 struct dirent *ptr; | |
4843 | |
4844 dir = opendir(path); | |
4845 if (dir == NULL) return true; | |
4846 | |
4847 /* Scan the directory */ | |
4848 bool result = true; | |
4849 char buf[sizeof(struct dirent) + MAX_PATH]; | |
4850 while (result && (ptr = ::readdir(dir)) != NULL) { | |
4851 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
4852 result = false; | |
4853 } | |
4854 } | |
4855 closedir(dir); | |
4856 return result; | |
4857 } | |
4858 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4859 // This code originates from JDK's sysOpen and open64_w |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
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diff
changeset
|
4860 // from src/solaris/hpi/src/system_md.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4861 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
4862 #ifndef O_DELETE |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4863 #define O_DELETE 0x10000 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4864 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4865 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4866 // Open a file. Unlink the file immediately after open returns |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4867 // if the specified oflag has the O_DELETE flag set. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4868 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4869 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4870 int os::open(const char *path, int oflag, int mode) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4871 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4872 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4873 errno = ENAMETOOLONG; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4874 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4875 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4876 int fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4877 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4878 oflag = oflag & ~O_DELETE; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4879 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4880 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4881 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4882 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4883 //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
|
4884 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4885 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4886 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4887 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4888 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4889 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4890 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4891 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4892 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4893 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4894 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4895 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4896 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4897 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4898 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4899 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4900 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4901 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4902 * 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
|
4903 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4904 * 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
|
4905 * 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
|
4906 * 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
|
4907 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4908 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4909 * - 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
|
4910 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4911 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4912 * - 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
|
4913 * suffering from bug 1085341. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4914 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4915 * (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
|
4916 * design flaw) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4917 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4918 * See: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4919 * 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
|
4920 * 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
|
4921 * 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
|
4922 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4923 #ifdef FD_CLOEXEC |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4924 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4925 int flags = ::fcntl(fd, F_GETFD); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4926 if (flags != -1) |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4927 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4928 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4929 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4930 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4931 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4932 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4933 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4934 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4935 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4936 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4937 |
0 | 4938 // create binary file, rewriting existing file if required |
4939 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4940 int oflags = O_WRONLY | O_CREAT; | |
4941 if (!rewrite_existing) { | |
4942 oflags |= O_EXCL; | |
4943 } | |
4944 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
4945 } | |
4946 | |
4947 // return current position of file pointer | |
4948 jlong os::current_file_offset(int fd) { | |
4949 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
4950 } | |
4951 | |
4952 // move file pointer to the specified offset | |
4953 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4954 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
4955 } | |
4956 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4957 // This code originates from JDK's sysAvailable |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4958 // 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
|
4959 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4960 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4961 jlong cur, end; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4962 int mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4963 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4964 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4965 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4966 mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4967 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
|
4968 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4969 * 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
|
4970 * 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
|
4971 * blocking, interruptible calls in this file. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4972 */ |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4973 int n; |
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4974 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
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4975 *bytes = n; |
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4976 return 1; |
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|
4977 } |
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|
4978 } |
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|
4979 } |
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|
4980 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
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4981 return 0; |
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4982 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
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4983 return 0; |
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4984 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
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4985 return 0; |
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|
4986 } |
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|
4987 *bytes = end - cur; |
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|
4988 return 1; |
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|
4989 } |
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|
4990 |
2033
03e1b9fce89d
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4991 int os::socket_available(int fd, jint *pbytes) { |
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4992 // Linux doc says EINTR not returned, unlike Solaris |
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4993 int ret = ::ioctl(fd, FIONREAD, pbytes); |
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4994 |
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4995 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
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4996 // is expected to return 0 on failure and 1 on success to the jdk. |
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4997 return (ret < 0) ? 0 : 1; |
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|
4998 } |
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|
4999 |
0 | 5000 // Map a block of memory. |
6197 | 5001 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5002 char *addr, size_t bytes, bool read_only, |
5003 bool allow_exec) { | |
5004 int prot; | |
5909 | 5005 int flags = MAP_PRIVATE; |
0 | 5006 |
5007 if (read_only) { | |
5008 prot = PROT_READ; | |
5009 } else { | |
5010 prot = PROT_READ | PROT_WRITE; | |
5011 } | |
5012 | |
5013 if (allow_exec) { | |
5014 prot |= PROT_EXEC; | |
5015 } | |
5016 | |
5017 if (addr != NULL) { | |
5018 flags |= MAP_FIXED; | |
5019 } | |
5020 | |
5021 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
5022 fd, file_offset); | |
5023 if (mapped_address == MAP_FAILED) { | |
5024 return NULL; | |
5025 } | |
5026 return mapped_address; | |
5027 } | |
5028 | |
5029 | |
5030 // Remap a block of memory. | |
6197 | 5031 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 5032 char *addr, size_t bytes, bool read_only, |
5033 bool allow_exec) { | |
5034 // same as map_memory() on this OS | |
5035 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
5036 allow_exec); | |
5037 } | |
5038 | |
5039 | |
5040 // Unmap a block of memory. | |
6197 | 5041 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 5042 return munmap(addr, bytes) == 0; |
5043 } | |
5044 | |
5045 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
5046 | |
5047 static clockid_t thread_cpu_clockid(Thread* thread) { | |
5048 pthread_t tid = thread->osthread()->pthread_id(); | |
5049 clockid_t clockid; | |
5050 | |
5051 // Get thread clockid | |
5052 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
5053 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
5054 return clockid; | |
5055 } | |
5056 | |
5057 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
5058 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
5059 // of a thread. | |
5060 // | |
5061 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
5062 // the fast estimate available on the platform. | |
5063 | |
5064 jlong os::current_thread_cpu_time() { | |
5065 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5066 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5067 } else { | |
5068 // return user + sys since the cost is the same | |
5069 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
5070 } | |
5071 } | |
5072 | |
5073 jlong os::thread_cpu_time(Thread* thread) { | |
5074 // consistent with what current_thread_cpu_time() returns | |
5075 if (os::Linux::supports_fast_thread_cpu_time()) { | |
5076 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5077 } else { | |
5078 return slow_thread_cpu_time(thread, true /* user + sys */); | |
5079 } | |
5080 } | |
5081 | |
5082 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
5083 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5084 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
5085 } else { | |
5086 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
5087 } | |
5088 } | |
5089 | |
5090 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5091 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
5092 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
5093 } else { | |
5094 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
5095 } | |
5096 } | |
5097 | |
5098 // | |
5099 // -1 on error. | |
5100 // | |
5101 | |
5102 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
5103 static bool proc_task_unchecked = true; | |
5104 static const char *proc_stat_path = "/proc/%d/stat"; | |
5105 pid_t tid = thread->osthread()->thread_id(); | |
5106 char *s; | |
5107 char stat[2048]; | |
5108 int statlen; | |
5109 char proc_name[64]; | |
5110 int count; | |
5111 long sys_time, user_time; | |
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5112 char cdummy; |
0 | 5113 int idummy; |
5114 long ldummy; | |
5115 FILE *fp; | |
5116 | |
5117 // The /proc/<tid>/stat aggregates per-process usage on | |
5118 // new Linux kernels 2.6+ where NPTL is supported. | |
5119 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
5120 // See bug 6328462. | |
8099
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|
5121 // There possibly can be cases where there is no directory |
4c1d8002ffb1
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diff
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|
5122 // /proc/self/task, so we check its availability. |
0 | 5123 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
5124 // This is executed only once | |
5125 proc_task_unchecked = false; | |
5126 fp = fopen("/proc/self/task", "r"); | |
5127 if (fp != NULL) { | |
5128 proc_stat_path = "/proc/self/task/%d/stat"; | |
5129 fclose(fp); | |
5130 } | |
5131 } | |
5132 | |
5133 sprintf(proc_name, proc_stat_path, tid); | |
5134 fp = fopen(proc_name, "r"); | |
5135 if ( fp == NULL ) return -1; | |
5136 statlen = fread(stat, 1, 2047, fp); | |
5137 stat[statlen] = '\0'; | |
5138 fclose(fp); | |
5139 | |
5140 // Skip pid and the command string. Note that we could be dealing with | |
5141 // weird command names, e.g. user could decide to rename java launcher | |
5142 // to "java 1.4.2 :)", then the stat file would look like | |
5143 // 1234 (java 1.4.2 :)) R ... ... | |
5144 // We don't really need to know the command string, just find the last | |
5145 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
5146 s = strrchr(stat, ')'); | |
5147 if (s == NULL ) return -1; | |
5148 | |
5149 // Skip blank chars | |
5150 do s++; while (isspace(*s)); | |
5151 | |
1681
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|
5152 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
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|
5153 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 5154 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
5155 &user_time, &sys_time); | |
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5156 if ( count != 13 ) return -1; |
0 | 5157 if (user_sys_cpu_time) { |
5158 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
5159 } else { | |
5160 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
5161 } | |
5162 } | |
5163 | |
5164 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5165 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5166 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5167 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5168 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5169 } | |
5170 | |
5171 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
5172 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
5173 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
5174 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
5175 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
5176 } | |
5177 | |
5178 bool os::is_thread_cpu_time_supported() { | |
5179 return true; | |
5180 } | |
5181 | |
5182 // System loadavg support. Returns -1 if load average cannot be obtained. | |
5183 // Linux doesn't yet have a (official) notion of processor sets, | |
5184 // so just return the system wide load average. | |
5185 int os::loadavg(double loadavg[], int nelem) { | |
5186 return ::getloadavg(loadavg, nelem); | |
5187 } | |
5188 | |
5189 void os::pause() { | |
5190 char filename[MAX_PATH]; | |
5191 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
5192 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
5193 } else { | |
5194 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
5195 } | |
5196 | |
5197 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
5198 if (fd != -1) { | |
5199 struct stat buf; | |
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changeset
|
5200 ::close(fd); |
0 | 5201 while (::stat(filename, &buf) == 0) { |
5202 (void)::poll(NULL, 0, 100); | |
5203 } | |
5204 } else { | |
5205 jio_fprintf(stderr, | |
5206 "Could not open pause file '%s', continuing immediately.\n", filename); | |
5207 } | |
5208 } | |
5209 | |
5210 | |
5211 // Refer to the comments in os_solaris.cpp park-unpark. | |
5212 // | |
5213 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
5214 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
5215 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
5216 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
5217 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
5218 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
5219 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
5220 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
5221 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
5222 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
5223 // of libpthread avoids the problem, but isn't practical. | |
5224 // | |
5225 // Possible remedies: | |
5226 // | |
5227 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
5228 // This is palliative and probabilistic, however. If the thread is preempted | |
5229 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
5230 // than the minimum period may have passed, and the abstime may be stale (in the | |
5231 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
5232 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
5233 // | |
5234 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
5235 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
5236 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
5237 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
5238 // thread. | |
5239 // | |
5240 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
5241 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
5242 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
5243 // This also works well. In fact it avoids kernel-level scalability impediments | |
5244 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
5245 // timers in a graceful fashion. | |
5246 // | |
5247 // 4. When the abstime value is in the past it appears that control returns | |
5248 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5249 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5250 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5251 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5252 // It may be possible to avoid reinitialization by checking the return | |
5253 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5254 // condvar we must establish the invariant that cond_signal() is only called | |
5255 // within critical sections protected by the adjunct mutex. This prevents | |
5256 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5257 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5258 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5259 // | |
5260 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5261 // structure when a condvar is used or initialized. cond_destroy() would | |
5262 // release the helper structure. Our reinitialize-after-timedwait fix | |
5263 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5264 // | |
5265 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5266 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5267 // and only enabling the work-around for vulnerable environments. | |
5268 | |
5269 // utility to compute the abstime argument to timedwait: | |
5270 // millis is the relative timeout time | |
5271 // abstime will be the absolute timeout time | |
5272 // TODO: replace compute_abstime() with unpackTime() | |
5273 | |
5274 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5275 if (millis < 0) millis = 0; | |
5276 struct timeval now; | |
5277 int status = gettimeofday(&now, NULL); | |
5278 assert(status == 0, "gettimeofday"); | |
5279 jlong seconds = millis / 1000; | |
5280 millis %= 1000; | |
5281 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5282 seconds = 50000000; | |
5283 } | |
5284 abstime->tv_sec = now.tv_sec + seconds; | |
5285 long usec = now.tv_usec + millis * 1000; | |
5286 if (usec >= 1000000) { | |
5287 abstime->tv_sec += 1; | |
5288 usec -= 1000000; | |
5289 } | |
5290 abstime->tv_nsec = usec * 1000; | |
5291 return abstime; | |
5292 } | |
5293 | |
5294 | |
5295 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5296 // Conceptually TryPark() should be equivalent to park(0). | |
5297 | |
5298 int os::PlatformEvent::TryPark() { | |
5299 for (;;) { | |
5300 const int v = _Event ; | |
5301 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5302 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5303 } | |
5304 } | |
5305 | |
5306 void os::PlatformEvent::park() { // AKA "down()" | |
5307 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5308 // may call park(). | |
5309 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5310 int v ; | |
5311 for (;;) { | |
5312 v = _Event ; | |
5313 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5314 } | |
5315 guarantee (v >= 0, "invariant") ; | |
5316 if (v == 0) { | |
5317 // Do this the hard way by blocking ... | |
5318 int status = pthread_mutex_lock(_mutex); | |
5319 assert_status(status == 0, status, "mutex_lock"); | |
5320 guarantee (_nParked == 0, "invariant") ; | |
5321 ++ _nParked ; | |
5322 while (_Event < 0) { | |
5323 status = pthread_cond_wait(_cond, _mutex); | |
5324 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5325 // Treat this the same as if the wait was interrupted | |
5326 if (status == ETIME) { status = EINTR; } | |
5327 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5328 } | |
5329 -- _nParked ; | |
5330 | |
5331 _Event = 0 ; | |
5332 status = pthread_mutex_unlock(_mutex); | |
5333 assert_status(status == 0, status, "mutex_unlock"); | |
7629
22ba8c8ce6a6
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5334 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
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7456
diff
changeset
|
5335 // correctly with each other. |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
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diff
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|
5336 OrderAccess::fence(); |
0 | 5337 } |
5338 guarantee (_Event >= 0, "invariant") ; | |
5339 } | |
5340 | |
5341 int os::PlatformEvent::park(jlong millis) { | |
5342 guarantee (_nParked == 0, "invariant") ; | |
5343 | |
5344 int v ; | |
5345 for (;;) { | |
5346 v = _Event ; | |
5347 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5348 } | |
5349 guarantee (v >= 0, "invariant") ; | |
5350 if (v != 0) return OS_OK ; | |
5351 | |
5352 // We do this the hard way, by blocking the thread. | |
5353 // Consider enforcing a minimum timeout value. | |
5354 struct timespec abst; | |
5355 compute_abstime(&abst, millis); | |
5356 | |
5357 int ret = OS_TIMEOUT; | |
5358 int status = pthread_mutex_lock(_mutex); | |
5359 assert_status(status == 0, status, "mutex_lock"); | |
5360 guarantee (_nParked == 0, "invariant") ; | |
5361 ++_nParked ; | |
5362 | |
5363 // Object.wait(timo) will return because of | |
5364 // (a) notification | |
5365 // (b) timeout | |
5366 // (c) thread.interrupt | |
5367 // | |
5368 // Thread.interrupt and object.notify{All} both call Event::set. | |
5369 // That is, we treat thread.interrupt as a special case of notification. | |
5370 // The underlying Solaris implementation, cond_timedwait, admits | |
5371 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5372 // JVM from making those visible to Java code. As such, we must | |
5373 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5374 // | |
5375 // TODO: properly differentiate simultaneous notify+interrupt. | |
5376 // In that case, we should propagate the notify to another waiter. | |
5377 | |
5378 while (_Event < 0) { | |
5379 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5380 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5381 pthread_cond_destroy (_cond); | |
5382 pthread_cond_init (_cond, NULL) ; | |
5383 } | |
5384 assert_status(status == 0 || status == EINTR || | |
5385 status == ETIME || status == ETIMEDOUT, | |
5386 status, "cond_timedwait"); | |
5387 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5388 if (status == ETIME || status == ETIMEDOUT) break ; | |
5389 // We consume and ignore EINTR and spurious wakeups. | |
5390 } | |
5391 --_nParked ; | |
5392 if (_Event >= 0) { | |
5393 ret = OS_OK; | |
5394 } | |
5395 _Event = 0 ; | |
5396 status = pthread_mutex_unlock(_mutex); | |
5397 assert_status(status == 0, status, "mutex_unlock"); | |
5398 assert (_nParked == 0, "invariant") ; | |
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5399 // Paranoia to ensure our locked and lock-free paths interact |
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5400 // correctly with each other. |
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|
5401 OrderAccess::fence(); |
0 | 5402 return ret; |
5403 } | |
5404 | |
5405 void os::PlatformEvent::unpark() { | |
7629
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5406 // Transitions for _Event: |
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5407 // 0 :=> 1 |
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5408 // 1 :=> 1 |
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5409 // -1 :=> either 0 or 1; must signal target thread |
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5410 // That is, we can safely transition _Event from -1 to either |
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5411 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5412 // unpark() calls. |
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5413 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5414 // |
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5415 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5416 // that it will take two back-to-back park() calls for the owning |
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5417 // thread to block. This has the benefit of forcing a spurious return |
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5418 // from the first park() call after an unpark() call which will help |
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5419 // shake out uses of park() and unpark() without condition variables. |
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5420 |
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5421 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5422 |
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5423 // Wait for the thread associated with the event to vacate |
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5424 int status = pthread_mutex_lock(_mutex); |
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5425 assert_status(status == 0, status, "mutex_lock"); |
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5426 int AnyWaiters = _nParked; |
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5427 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5428 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5429 AnyWaiters = 0; |
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5430 pthread_cond_signal(_cond); |
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5431 } |
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5432 status = pthread_mutex_unlock(_mutex); |
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5433 assert_status(status == 0, status, "mutex_unlock"); |
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5434 if (AnyWaiters != 0) { |
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5435 status = pthread_cond_signal(_cond); |
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5436 assert_status(status == 0, status, "cond_signal"); |
0 | 5437 } |
5438 | |
5439 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5440 // This is safe and avoids a common class of futile wakeups. In rare | |
5441 // circumstances this can cause a thread to return prematurely from | |
5442 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5443 // simply re-test the condition and re-park itself. | |
5444 } | |
5445 | |
5446 | |
5447 // JSR166 | |
5448 // ------------------------------------------------------- | |
5449 | |
5450 /* | |
5451 * The solaris and linux implementations of park/unpark are fairly | |
5452 * conservative for now, but can be improved. They currently use a | |
5453 * mutex/condvar pair, plus a a count. | |
5454 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5455 * sets count to 1 and signals condvar. Only one thread ever waits | |
5456 * on the condvar. Contention seen when trying to park implies that someone | |
5457 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5458 * is no need to track notifications. | |
5459 */ | |
5460 | |
5461 #define MAX_SECS 100000000 | |
5462 /* | |
5463 * This code is common to linux and solaris and will be moved to a | |
5464 * common place in dolphin. | |
5465 * | |
5466 * The passed in time value is either a relative time in nanoseconds | |
5467 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5468 * into suitable seconds and nanoseconds components and stored in the | |
5469 * given timespec structure. | |
5470 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5471 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5472 * overflow if times way in the future are given. Further on Solaris versions | |
5473 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5474 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5475 * As it will be 28 years before "now + 100000000" will overflow we can | |
5476 * ignore overflow and just impose a hard-limit on seconds using the value | |
5477 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5478 * years from "now". | |
5479 */ | |
5480 | |
5481 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5482 assert (time > 0, "convertTime"); | |
5483 | |
5484 struct timeval now; | |
5485 int status = gettimeofday(&now, NULL); | |
5486 assert(status == 0, "gettimeofday"); | |
5487 | |
5488 time_t max_secs = now.tv_sec + MAX_SECS; | |
5489 | |
5490 if (isAbsolute) { | |
5491 jlong secs = time / 1000; | |
5492 if (secs > max_secs) { | |
5493 absTime->tv_sec = max_secs; | |
5494 } | |
5495 else { | |
5496 absTime->tv_sec = secs; | |
5497 } | |
5498 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
5499 } | |
5500 else { | |
5501 jlong secs = time / NANOSECS_PER_SEC; | |
5502 if (secs >= MAX_SECS) { | |
5503 absTime->tv_sec = max_secs; | |
5504 absTime->tv_nsec = 0; | |
5505 } | |
5506 else { | |
5507 absTime->tv_sec = now.tv_sec + secs; | |
5508 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
5509 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
5510 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5511 ++absTime->tv_sec; // note: this must be <= max_secs | |
5512 } | |
5513 } | |
5514 } | |
5515 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5516 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5517 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5518 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5519 } | |
5520 | |
5521 void Parker::park(bool isAbsolute, jlong time) { | |
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5522 // Ideally we'd do something useful while spinning, such |
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5523 // as calling unpackTime(). |
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5524 |
0 | 5525 // Optional fast-path check: |
5526 // Return immediately if a permit is available. | |
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5527 // We depend on Atomic::xchg() having full barrier semantics |
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5528 // since we are doing a lock-free update to _counter. |
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5529 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5530 |
5531 Thread* thread = Thread::current(); | |
5532 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5533 JavaThread *jt = (JavaThread *)thread; | |
5534 | |
5535 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5536 // Check interrupt before trying to wait | |
5537 if (Thread::is_interrupted(thread, false)) { | |
5538 return; | |
5539 } | |
5540 | |
5541 // Next, demultiplex/decode time arguments | |
5542 timespec absTime; | |
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5543 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5544 return; |
5545 } | |
5546 if (time > 0) { | |
5547 unpackTime(&absTime, isAbsolute, time); | |
5548 } | |
5549 | |
5550 | |
5551 // Enter safepoint region | |
5552 // Beware of deadlocks such as 6317397. | |
5553 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5554 // In particular a thread must never block on the Threads_lock while | |
5555 // holding the Parker:: mutex. If safepoints are pending both the | |
5556 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5557 ThreadBlockInVM tbivm(jt); | |
5558 | |
5559 // Don't wait if cannot get lock since interference arises from | |
5560 // unblocking. Also. check interrupt before trying wait | |
5561 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5562 return; | |
5563 } | |
5564 | |
5565 int status ; | |
5566 if (_counter > 0) { // no wait needed | |
5567 _counter = 0; | |
5568 status = pthread_mutex_unlock(_mutex); | |
5569 assert (status == 0, "invariant") ; | |
7629
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5570 // Paranoia to ensure our locked and lock-free paths interact |
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|
5571 // correctly with each other and Java-level accesses. |
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5572 OrderAccess::fence(); |
0 | 5573 return; |
5574 } | |
5575 | |
5576 #ifdef ASSERT | |
5577 // Don't catch signals while blocked; let the running threads have the signals. | |
5578 // (This allows a debugger to break into the running thread.) | |
5579 sigset_t oldsigs; | |
5580 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5581 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5582 #endif | |
5583 | |
5584 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5585 jt->set_suspend_equivalent(); | |
5586 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5587 | |
5588 if (time == 0) { | |
5589 status = pthread_cond_wait (_cond, _mutex) ; | |
5590 } else { | |
5591 status = os::Linux::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
5592 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5593 pthread_cond_destroy (_cond) ; | |
5594 pthread_cond_init (_cond, NULL); | |
5595 } | |
5596 } | |
5597 assert_status(status == 0 || status == EINTR || | |
5598 status == ETIME || status == ETIMEDOUT, | |
5599 status, "cond_timedwait"); | |
5600 | |
5601 #ifdef ASSERT | |
5602 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5603 #endif | |
5604 | |
5605 _counter = 0 ; | |
5606 status = pthread_mutex_unlock(_mutex) ; | |
5607 assert_status(status == 0, status, "invariant") ; | |
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5608 // Paranoia to ensure our locked and lock-free paths interact |
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|
5609 // correctly with each other and Java-level accesses. |
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|
5610 OrderAccess::fence(); |
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|
5611 |
0 | 5612 // If externally suspended while waiting, re-suspend |
5613 if (jt->handle_special_suspend_equivalent_condition()) { | |
5614 jt->java_suspend_self(); | |
5615 } | |
5616 } | |
5617 | |
5618 void Parker::unpark() { | |
5619 int s, status ; | |
5620 status = pthread_mutex_lock(_mutex); | |
5621 assert (status == 0, "invariant") ; | |
5622 s = _counter; | |
5623 _counter = 1; | |
5624 if (s < 1) { | |
5625 if (WorkAroundNPTLTimedWaitHang) { | |
5626 status = pthread_cond_signal (_cond) ; | |
5627 assert (status == 0, "invariant") ; | |
5628 status = pthread_mutex_unlock(_mutex); | |
5629 assert (status == 0, "invariant") ; | |
5630 } else { | |
5631 status = pthread_mutex_unlock(_mutex); | |
5632 assert (status == 0, "invariant") ; | |
5633 status = pthread_cond_signal (_cond) ; | |
5634 assert (status == 0, "invariant") ; | |
5635 } | |
5636 } else { | |
5637 pthread_mutex_unlock(_mutex); | |
5638 assert (status == 0, "invariant") ; | |
5639 } | |
5640 } | |
5641 | |
5642 | |
5643 extern char** environ; | |
5644 | |
5645 #ifndef __NR_fork | |
5646 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
5647 #endif | |
5648 | |
5649 #ifndef __NR_execve | |
5650 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
5651 #endif | |
5652 | |
5653 // Run the specified command in a separate process. Return its exit value, | |
5654 // or -1 on failure (e.g. can't fork a new process). | |
5655 // Unlike system(), this function can be called from signal handler. It | |
5656 // doesn't block SIGINT et al. | |
5657 int os::fork_and_exec(char* cmd) { | |
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changeset
|
5658 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 5659 |
5660 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
5661 // pthread_atfork handlers and reset pthread library. All we need is a | |
5662 // separate process to execve. Make a direct syscall to fork process. | |
5663 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
5664 // the best... | |
5665 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
5666 IA64_ONLY(fork();) | |
5667 | |
5668 if (pid < 0) { | |
5669 // fork failed | |
5670 return -1; | |
5671 | |
5672 } else if (pid == 0) { | |
5673 // child process | |
5674 | |
5675 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
5676 // first to kill every thread on the thread list. Because this list is | |
5677 // not reset by fork() (see notes above), execve() will instead kill | |
5678 // every thread in the parent process. We know this is the only thread | |
5679 // in the new process, so make a system call directly. | |
5680 // IA64 should use normal execve() from glibc to match the glibc fork() | |
5681 // above. | |
5682 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
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|
5683 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 5684 |
5685 // execve failed | |
5686 _exit(-1); | |
5687 | |
5688 } else { | |
5689 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
5690 // care about the actual exit code, for now. | |
5691 | |
5692 int status; | |
5693 | |
5694 // Wait for the child process to exit. This returns immediately if | |
5695 // the child has already exited. */ | |
5696 while (waitpid(pid, &status, 0) < 0) { | |
5697 switch (errno) { | |
5698 case ECHILD: return 0; | |
5699 case EINTR: break; | |
5700 default: return -1; | |
5701 } | |
5702 } | |
5703 | |
5704 if (WIFEXITED(status)) { | |
5705 // The child exited normally; get its exit code. | |
5706 return WEXITSTATUS(status); | |
5707 } else if (WIFSIGNALED(status)) { | |
5708 // The child exited because of a signal | |
5709 // The best value to return is 0x80 + signal number, | |
5710 // because that is what all Unix shells do, and because | |
5711 // it allows callers to distinguish between process exit and | |
5712 // process death by signal. | |
5713 return 0x80 + WTERMSIG(status); | |
5714 } else { | |
5715 // Unknown exit code; pass it through | |
5716 return status; | |
5717 } | |
5718 } | |
5719 } | |
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126ea7725993
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|
5720 |
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changeset
|
5721 // is_headless_jre() |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5722 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5723 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5724 // in order to report if we are running in a headless jre |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5725 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5726 // Since JDK8 xawt/libmawt.so was moved into the same directory |
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5727 // as libawt.so, and renamed libawt_xawt.so |
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5728 // |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5729 bool os::is_headless_jre() { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5730 struct stat statbuf; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5731 char buf[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5732 char libmawtpath[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5733 const char *xawtstr = "/xawt/libmawt.so"; |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5734 const char *new_xawtstr = "/libawt_xawt.so"; |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5735 char *p; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5736 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5737 // Get path to libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5738 os::jvm_path(buf, sizeof(buf)); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5739 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5740 // Get rid of libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5741 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5742 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5743 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5744 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5745 // Get rid of client or server |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5746 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5747 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5748 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5749 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5750 // check xawt/libmawt.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5751 strcpy(libmawtpath, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5752 strcat(libmawtpath, xawtstr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5753 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5754 |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5755 // check libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5756 strcpy(libmawtpath, buf); |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5757 strcat(libmawtpath, new_xawtstr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5758 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5759 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5760 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5761 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5762 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5763 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5764 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5765 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
|
5766 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5767 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5768 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5769 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5770 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5771 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5772 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5773 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5774 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5775 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5776 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5777 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5778 // 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
|
5779 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5780 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5781 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5782 // ctor |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5783 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5784 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5785 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
|
5786 _fd = fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5787 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5788 if (os::create_thread(this, os::os_thread)) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5789 _memnotify_thread = this; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5790 os::set_priority(this, NearMaxPriority); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5791 os::start_thread(this); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5792 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5793 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5794 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5795 // Where all the work gets done |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5796 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5797 void MemNotifyThread::run() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5798 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5799 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5800 // Set up the select arguments |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5801 fd_set rfds; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5802 if (_fd != -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5803 FD_ZERO(&rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5804 FD_SET(_fd, &rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5805 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5806 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5807 // 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
|
5808 while (1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5809 // 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
|
5810 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
|
5811 if (rc == -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5812 perror("select!\n"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5813 break; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5814 } else if (rc) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5815 //ssize_t free_before = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5816 //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
|
5817 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5818 // 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
|
5819 // try to do something about that |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5820 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5821 // 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
|
5822 if (!Universe::heap()->is_gc_active()) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5823 Universe::heap()->collect(GCCause::_allocation_failure); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5824 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5825 //ssize_t free_after = os::available_memory(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5826 //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
|
5827 //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
|
5828 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5829 // 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
|
5830 // 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
|
5831 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5832 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5833 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5834 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5835 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5836 // 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
|
5837 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5838 void MemNotifyThread::start() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5839 int fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5840 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5841 if (fd < 0) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5842 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5843 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5844 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5845 if (memnotify_thread() == NULL) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5846 new MemNotifyThread(fd); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5847 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5848 } |
10405 | 5849 |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5850 #endif // JAVASE_EMBEDDED |