Mercurial > hg > graal-compiler
annotate src/os/linux/vm/os_linux.cpp @ 9850:6e0c6526334b
Add HeapInfo interface for write barriers and compressed oops support
author | Christos Kotselidis <christos.kotselidis@oracle.com> |
---|---|
date | Tue, 04 Jun 2013 10:55:13 +0200 |
parents | 89e4d67fdd2a |
children | 836a62f43af9 |
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 |
104 #define MAX_PATH (2 * K) | |
105 | |
106 // for timer info max values which include all bits | |
107 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
108 | |
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109 #define LARGEPAGES_BIT (1 << 6) |
0 | 110 //////////////////////////////////////////////////////////////////////////////// |
111 // global variables | |
112 julong os::Linux::_physical_memory = 0; | |
113 | |
114 address os::Linux::_initial_thread_stack_bottom = NULL; | |
115 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
116 | |
117 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
118 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
119 Mutex* os::Linux::_createThread_lock = NULL; | |
120 pthread_t os::Linux::_main_thread; | |
121 int os::Linux::_page_size = -1; | |
122 bool os::Linux::_is_floating_stack = false; | |
123 bool os::Linux::_is_NPTL = false; | |
124 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
199
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125 const char * os::Linux::_glibc_version = NULL; |
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126 const char * os::Linux::_libpthread_version = NULL; |
0 | 127 |
128 static jlong initial_time_count=0; | |
129 | |
130 static int clock_tics_per_sec = 100; | |
131 | |
132 // For diagnostics to print a message once. see run_periodic_checks | |
133 static sigset_t check_signal_done; | |
134 static bool check_signals = true;; | |
135 | |
136 static pid_t _initial_pid = 0; | |
137 | |
138 /* Signal number used to suspend/resume a thread */ | |
139 | |
140 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
141 static int SR_signum = SIGUSR2; | |
142 sigset_t SR_sigset; | |
143 | |
242 | 144 /* Used to protect dlsym() calls */ |
145 static pthread_mutex_t dl_mutex; | |
146 | |
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147 #ifdef JAVASE_EMBEDDED |
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148 class MemNotifyThread: public Thread { |
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149 friend class VMStructs; |
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150 public: |
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151 virtual void run(); |
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152 |
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153 private: |
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154 static MemNotifyThread* _memnotify_thread; |
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155 int _fd; |
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156 |
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157 public: |
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158 |
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159 // Constructor |
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160 MemNotifyThread(int fd); |
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161 |
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162 // Tester |
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163 bool is_memnotify_thread() const { return true; } |
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164 |
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165 // Printing |
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166 char* name() const { return (char*)"Linux MemNotify Thread"; } |
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167 |
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168 // Returns the single instance of the MemNotifyThread |
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169 static MemNotifyThread* memnotify_thread() { return _memnotify_thread; } |
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170 |
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171 // Create and start the single instance of MemNotifyThread |
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172 static void start(); |
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173 }; |
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174 #endif // JAVASE_EMBEDDED |
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175 |
0 | 176 // utility functions |
177 | |
178 static int SR_initialize(); | |
179 | |
180 julong os::available_memory() { | |
181 return Linux::available_memory(); | |
182 } | |
183 | |
184 julong os::Linux::available_memory() { | |
185 // values in struct sysinfo are "unsigned long" | |
186 struct sysinfo si; | |
187 sysinfo(&si); | |
188 | |
189 return (julong)si.freeram * si.mem_unit; | |
190 } | |
191 | |
192 julong os::physical_memory() { | |
193 return Linux::physical_memory(); | |
194 } | |
195 | |
196 //////////////////////////////////////////////////////////////////////////////// | |
197 // environment support | |
198 | |
199 bool os::getenv(const char* name, char* buf, int len) { | |
200 const char* val = ::getenv(name); | |
201 if (val != NULL && strlen(val) < (size_t)len) { | |
202 strcpy(buf, val); | |
203 return true; | |
204 } | |
205 if (len > 0) buf[0] = 0; // return a null string | |
206 return false; | |
207 } | |
208 | |
209 | |
210 // Return true if user is running as root. | |
211 | |
212 bool os::have_special_privileges() { | |
213 static bool init = false; | |
214 static bool privileges = false; | |
215 if (!init) { | |
216 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
217 init = true; | |
218 } | |
219 return privileges; | |
220 } | |
221 | |
222 | |
223 #ifndef SYS_gettid | |
224 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
225 #ifdef __ia64__ | |
226 #define SYS_gettid 1105 | |
227 #elif __i386__ | |
228 #define SYS_gettid 224 | |
229 #elif __amd64__ | |
230 #define SYS_gettid 186 | |
231 #elif __sparc__ | |
232 #define SYS_gettid 143 | |
233 #else | |
234 #error define gettid for the arch | |
235 #endif | |
236 #endif | |
237 | |
238 // Cpu architecture string | |
1010 | 239 #if defined(ZERO) |
240 static char cpu_arch[] = ZERO_LIBARCH; | |
241 #elif defined(IA64) | |
0 | 242 static char cpu_arch[] = "ia64"; |
243 #elif defined(IA32) | |
244 static char cpu_arch[] = "i386"; | |
245 #elif defined(AMD64) | |
246 static char cpu_arch[] = "amd64"; | |
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247 #elif defined(ARM) |
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248 static char cpu_arch[] = "arm"; |
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249 #elif defined(PPC) |
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250 static char cpu_arch[] = "ppc"; |
0 | 251 #elif defined(SPARC) |
252 # ifdef _LP64 | |
253 static char cpu_arch[] = "sparcv9"; | |
254 # else | |
255 static char cpu_arch[] = "sparc"; | |
256 # endif | |
257 #else | |
258 #error Add appropriate cpu_arch setting | |
259 #endif | |
260 | |
261 | |
262 // pid_t gettid() | |
263 // | |
264 // Returns the kernel thread id of the currently running thread. Kernel | |
265 // thread id is used to access /proc. | |
266 // | |
267 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
268 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
269 // | |
270 pid_t os::Linux::gettid() { | |
271 int rslt = syscall(SYS_gettid); | |
272 if (rslt == -1) { | |
273 // old kernel, no NPTL support | |
274 return getpid(); | |
275 } else { | |
276 return (pid_t)rslt; | |
277 } | |
278 } | |
279 | |
280 // Most versions of linux have a bug where the number of processors are | |
281 // determined by looking at the /proc file system. In a chroot environment, | |
282 // the system call returns 1. This causes the VM to act as if it is | |
283 // a single processor and elide locking (see is_MP() call). | |
284 static bool unsafe_chroot_detected = false; | |
199
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285 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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286 "Java may be unstable running multithreaded in a chroot " |
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287 "environment on Linux when /proc filesystem is not mounted."; |
0 | 288 |
289 void os::Linux::initialize_system_info() { | |
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290 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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291 if (processor_count() == 1) { |
0 | 292 pid_t pid = os::Linux::gettid(); |
293 char fname[32]; | |
294 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
295 FILE *fp = fopen(fname, "r"); | |
296 if (fp == NULL) { | |
297 unsafe_chroot_detected = true; | |
298 } else { | |
299 fclose(fp); | |
300 } | |
301 } | |
302 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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303 assert(processor_count() > 0, "linux error"); |
0 | 304 } |
305 | |
306 void os::init_system_properties_values() { | |
307 // char arch[12]; | |
308 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
309 | |
310 // The next steps are taken in the product version: | |
311 // | |
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312 // Obtain the JAVA_HOME value from the location of libjvm.so. |
0 | 313 // This library should be located at: |
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314 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
0 | 315 // |
316 // If "/jre/lib/" appears at the right place in the path, then we | |
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317 // assume libjvm.so is installed in a JDK and we use this path. |
0 | 318 // |
319 // Otherwise exit with message: "Could not create the Java virtual machine." | |
320 // | |
321 // The following extra steps are taken in the debugging version: | |
322 // | |
323 // If "/jre/lib/" does NOT appear at the right place in the path | |
324 // instead of exit check for $JAVA_HOME environment variable. | |
325 // | |
326 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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327 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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328 // it looks like libjvm.so is installed there |
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329 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
0 | 330 // |
331 // Otherwise exit. | |
332 // | |
333 // Important note: if the location of libjvm.so changes this | |
334 // code needs to be changed accordingly. | |
335 | |
336 // The next few definitions allow the code to be verbatim: | |
6197 | 337 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
0 | 338 #define getenv(n) ::getenv(n) |
339 | |
340 /* | |
341 * See ld(1): | |
342 * The linker uses the following search paths to locate required | |
343 * shared libraries: | |
344 * 1: ... | |
345 * ... | |
346 * 7: The default directories, normally /lib and /usr/lib. | |
347 */ | |
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348 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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349 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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350 #else |
0 | 351 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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352 #endif |
0 | 353 |
354 #define EXTENSIONS_DIR "/lib/ext" | |
355 #define ENDORSED_DIR "/lib/endorsed" | |
356 #define REG_DIR "/usr/java/packages" | |
357 | |
358 { | |
359 /* sysclasspath, java_home, dll_dir */ | |
360 { | |
361 char *home_path; | |
362 char *dll_path; | |
363 char *pslash; | |
364 char buf[MAXPATHLEN]; | |
365 os::jvm_path(buf, sizeof(buf)); | |
366 | |
367 // Found the full path to libjvm.so. | |
368 // Now cut the path to <java_home>/jre if we can. | |
369 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
370 pslash = strrchr(buf, '/'); | |
371 if (pslash != NULL) | |
372 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
373 dll_path = malloc(strlen(buf) + 1); | |
374 if (dll_path == NULL) | |
375 return; | |
376 strcpy(dll_path, buf); | |
377 Arguments::set_dll_dir(dll_path); | |
378 | |
379 if (pslash != NULL) { | |
380 pslash = strrchr(buf, '/'); | |
381 if (pslash != NULL) { | |
382 *pslash = '\0'; /* get rid of /<arch> */ | |
383 pslash = strrchr(buf, '/'); | |
384 if (pslash != NULL) | |
385 *pslash = '\0'; /* get rid of /lib */ | |
386 } | |
387 } | |
388 | |
389 home_path = malloc(strlen(buf) + 1); | |
390 if (home_path == NULL) | |
391 return; | |
392 strcpy(home_path, buf); | |
393 Arguments::set_java_home(home_path); | |
394 | |
395 if (!set_boot_path('/', ':')) | |
396 return; | |
397 } | |
398 | |
399 /* | |
400 * Where to look for native libraries | |
401 * | |
402 * Note: Due to a legacy implementation, most of the library path | |
403 * is set in the launcher. This was to accomodate linking restrictions | |
404 * on legacy Linux implementations (which are no longer supported). | |
405 * Eventually, all the library path setting will be done here. | |
406 * | |
407 * However, to prevent the proliferation of improperly built native | |
408 * libraries, the new path component /usr/java/packages is added here. | |
409 * Eventually, all the library path setting will be done here. | |
410 */ | |
411 { | |
412 char *ld_library_path; | |
413 | |
414 /* | |
415 * Construct the invariant part of ld_library_path. Note that the | |
416 * space for the colon and the trailing null are provided by the | |
417 * nulls included by the sizeof operator (so actually we allocate | |
418 * a byte more than necessary). | |
419 */ | |
420 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + | |
421 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
422 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
423 | |
424 /* | |
425 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
426 * should always exist (until the legacy problem cited above is | |
427 * addressed). | |
428 */ | |
429 char *v = getenv("LD_LIBRARY_PATH"); | |
430 if (v != NULL) { | |
431 char *t = ld_library_path; | |
432 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
433 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
434 sprintf(ld_library_path, "%s:%s", v, t); | |
435 } | |
436 Arguments::set_library_path(ld_library_path); | |
437 } | |
438 | |
439 /* | |
440 * Extensions directories. | |
441 * | |
442 * Note that the space for the colon and the trailing null are provided | |
443 * by the nulls included by the sizeof operator (so actually one byte more | |
444 * than necessary is allocated). | |
445 */ | |
446 { | |
447 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
448 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
449 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
450 Arguments::get_java_home()); | |
451 Arguments::set_ext_dirs(buf); | |
452 } | |
453 | |
454 /* Endorsed standards default directory. */ | |
455 { | |
456 char * buf; | |
457 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
458 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
459 Arguments::set_endorsed_dirs(buf); | |
460 } | |
461 } | |
462 | |
463 #undef malloc | |
464 #undef getenv | |
465 #undef EXTENSIONS_DIR | |
466 #undef ENDORSED_DIR | |
467 | |
468 // Done | |
469 return; | |
470 } | |
471 | |
472 //////////////////////////////////////////////////////////////////////////////// | |
473 // breakpoint support | |
474 | |
475 void os::breakpoint() { | |
476 BREAKPOINT; | |
477 } | |
478 | |
479 extern "C" void breakpoint() { | |
480 // use debugger to set breakpoint here | |
481 } | |
482 | |
483 //////////////////////////////////////////////////////////////////////////////// | |
484 // signal support | |
485 | |
486 debug_only(static bool signal_sets_initialized = false); | |
487 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
488 | |
489 bool os::Linux::is_sig_ignored(int sig) { | |
490 struct sigaction oact; | |
491 sigaction(sig, (struct sigaction*)NULL, &oact); | |
492 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
493 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
494 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
495 return true; | |
496 else | |
497 return false; | |
498 } | |
499 | |
500 void os::Linux::signal_sets_init() { | |
501 // Should also have an assertion stating we are still single-threaded. | |
502 assert(!signal_sets_initialized, "Already initialized"); | |
503 // Fill in signals that are necessarily unblocked for all threads in | |
504 // the VM. Currently, we unblock the following signals: | |
505 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
506 // by -Xrs (=ReduceSignalUsage)); | |
507 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
508 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
509 // the dispositions or masks wrt these signals. | |
510 // Programs embedding the VM that want to use the above signals for their | |
511 // own purposes must, at this time, use the "-Xrs" option to prevent | |
512 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
513 // (See bug 4345157, and other related bugs). | |
514 // In reality, though, unblocking these signals is really a nop, since | |
515 // these signals are not blocked by default. | |
516 sigemptyset(&unblocked_sigs); | |
517 sigemptyset(&allowdebug_blocked_sigs); | |
518 sigaddset(&unblocked_sigs, SIGILL); | |
519 sigaddset(&unblocked_sigs, SIGSEGV); | |
520 sigaddset(&unblocked_sigs, SIGBUS); | |
521 sigaddset(&unblocked_sigs, SIGFPE); | |
522 sigaddset(&unblocked_sigs, SR_signum); | |
523 | |
524 if (!ReduceSignalUsage) { | |
525 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
526 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
527 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
528 } | |
529 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
530 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
531 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
532 } | |
533 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
534 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
535 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
536 } | |
537 } | |
538 // Fill in signals that are blocked by all but the VM thread. | |
539 sigemptyset(&vm_sigs); | |
540 if (!ReduceSignalUsage) | |
541 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
542 debug_only(signal_sets_initialized = true); | |
543 | |
544 } | |
545 | |
546 // These are signals that are unblocked while a thread is running Java. | |
547 // (For some reason, they get blocked by default.) | |
548 sigset_t* os::Linux::unblocked_signals() { | |
549 assert(signal_sets_initialized, "Not initialized"); | |
550 return &unblocked_sigs; | |
551 } | |
552 | |
553 // These are the signals that are blocked while a (non-VM) thread is | |
554 // running Java. Only the VM thread handles these signals. | |
555 sigset_t* os::Linux::vm_signals() { | |
556 assert(signal_sets_initialized, "Not initialized"); | |
557 return &vm_sigs; | |
558 } | |
559 | |
560 // These are signals that are blocked during cond_wait to allow debugger in | |
561 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
562 assert(signal_sets_initialized, "Not initialized"); | |
563 return &allowdebug_blocked_sigs; | |
564 } | |
565 | |
566 void os::Linux::hotspot_sigmask(Thread* thread) { | |
567 | |
568 //Save caller's signal mask before setting VM signal mask | |
569 sigset_t caller_sigmask; | |
570 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
571 | |
572 OSThread* osthread = thread->osthread(); | |
573 osthread->set_caller_sigmask(caller_sigmask); | |
574 | |
575 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
576 | |
577 if (!ReduceSignalUsage) { | |
578 if (thread->is_VM_thread()) { | |
579 // Only the VM thread handles BREAK_SIGNAL ... | |
580 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
581 } else { | |
582 // ... all other threads block BREAK_SIGNAL | |
583 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
584 } | |
585 } | |
586 } | |
587 | |
588 ////////////////////////////////////////////////////////////////////////////// | |
589 // detecting pthread library | |
590 | |
591 void os::Linux::libpthread_init() { | |
592 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
593 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
594 // generic name for earlier versions. | |
595 // Define macros here so we can build HotSpot on old systems. | |
596 # ifndef _CS_GNU_LIBC_VERSION | |
597 # define _CS_GNU_LIBC_VERSION 2 | |
598 # endif | |
599 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
600 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
601 # endif | |
602 | |
603 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
604 if (n > 0) { | |
6197 | 605 char *str = (char *)malloc(n, mtInternal); |
0 | 606 confstr(_CS_GNU_LIBC_VERSION, str, n); |
607 os::Linux::set_glibc_version(str); | |
608 } else { | |
609 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
610 static char _gnu_libc_version[32]; | |
611 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
612 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
613 os::Linux::set_glibc_version(_gnu_libc_version); | |
614 } | |
615 | |
616 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
617 if (n > 0) { | |
6197 | 618 char *str = (char *)malloc(n, mtInternal); |
0 | 619 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
620 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
621 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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622 // is the case. LinuxThreads has a hard limit on max number of threads. |
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623 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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624 // On the other hand, NPTL does not have such a limit, sysconf() |
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625 // will return -1 and errno is not changed. Check if it is really NPTL. |
0 | 626 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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627 strstr(str, "NPTL") && |
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628 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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629 free(str); |
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630 os::Linux::set_libpthread_version("linuxthreads"); |
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631 } else { |
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632 os::Linux::set_libpthread_version(str); |
0 | 633 } |
634 } else { | |
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635 // glibc before 2.3.2 only has LinuxThreads. |
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636 os::Linux::set_libpthread_version("linuxthreads"); |
0 | 637 } |
638 | |
639 if (strstr(libpthread_version(), "NPTL")) { | |
640 os::Linux::set_is_NPTL(); | |
641 } else { | |
642 os::Linux::set_is_LinuxThreads(); | |
643 } | |
644 | |
645 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
646 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
647 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
648 os::Linux::set_is_floating_stack(); | |
649 } | |
650 } | |
651 | |
652 ///////////////////////////////////////////////////////////////////////////// | |
653 // thread stack | |
654 | |
655 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
656 // to the stack guard, caller should block all signals. | |
657 // | |
658 // MAP_GROWSDOWN: | |
659 // A special mmap() flag that is used to implement thread stacks. It tells | |
660 // kernel that the memory region should extend downwards when needed. This | |
661 // allows early versions of LinuxThreads to only mmap the first few pages | |
662 // when creating a new thread. Linux kernel will automatically expand thread | |
663 // stack as needed (on page faults). | |
664 // | |
665 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
666 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
667 // region, it's hard to tell if the fault is due to a legitimate stack | |
668 // access or because of reading/writing non-exist memory (e.g. buffer | |
669 // overrun). As a rule, if the fault happens below current stack pointer, | |
670 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
671 // application (see Linux kernel fault.c). | |
672 // | |
673 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
674 // stack overflow detection. | |
675 // | |
676 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
677 // not use this flag. However, the stack of initial thread is not created | |
678 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
679 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
680 // and then attach the thread to JVM. | |
681 // | |
682 // To get around the problem and allow stack banging on Linux, we need to | |
683 // manually expand thread stack after receiving the SIGSEGV. | |
684 // | |
685 // There are two ways to expand thread stack to address "bottom", we used | |
686 // both of them in JVM before 1.5: | |
687 // 1. adjust stack pointer first so that it is below "bottom", and then | |
688 // touch "bottom" | |
689 // 2. mmap() the page in question | |
690 // | |
691 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
692 // if current sp is already near the lower end of page 101, and we need to | |
693 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
694 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
695 // That will destroy the mmap() frame and cause VM to crash. | |
696 // | |
697 // The following code works by adjusting sp first, then accessing the "bottom" | |
698 // page to force a page fault. Linux kernel will then automatically expand the | |
699 // stack mapping. | |
700 // | |
701 // _expand_stack_to() assumes its frame size is less than page size, which | |
702 // should always be true if the function is not inlined. | |
703 | |
704 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
705 #define NOINLINE | |
706 #else | |
707 #define NOINLINE __attribute__ ((noinline)) | |
708 #endif | |
709 | |
710 static void _expand_stack_to(address bottom) NOINLINE; | |
711 | |
712 static void _expand_stack_to(address bottom) { | |
713 address sp; | |
714 size_t size; | |
715 volatile char *p; | |
716 | |
717 // Adjust bottom to point to the largest address within the same page, it | |
718 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
719 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
720 bottom += os::Linux::page_size() - 1; | |
721 | |
722 // sp might be slightly above current stack pointer; if that's the case, we | |
723 // will alloca() a little more space than necessary, which is OK. Don't use | |
724 // os::current_stack_pointer(), as its result can be slightly below current | |
725 // stack pointer, causing us to not alloca enough to reach "bottom". | |
726 sp = (address)&sp; | |
727 | |
728 if (sp > bottom) { | |
729 size = sp - bottom; | |
730 p = (volatile char *)alloca(size); | |
731 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
732 p[0] = '\0'; | |
733 } | |
734 } | |
735 | |
736 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
737 assert(t!=NULL, "just checking"); | |
738 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
739 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
740 | |
741 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
742 sigset_t mask_all, old_sigset; | |
743 sigfillset(&mask_all); | |
744 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
745 _expand_stack_to(addr); | |
746 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
747 return true; | |
748 } | |
749 return false; | |
750 } | |
751 | |
752 ////////////////////////////////////////////////////////////////////////////// | |
753 // create new thread | |
754 | |
755 static address highest_vm_reserved_address(); | |
756 | |
757 // check if it's safe to start a new thread | |
758 static bool _thread_safety_check(Thread* thread) { | |
759 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
760 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
761 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
762 // allocated (MAP_FIXED) from high address space. Every thread stack | |
763 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
764 // it to other values if they rebuild LinuxThreads). | |
765 // | |
766 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
767 // the memory region has already been mmap'ed. That means if we have too | |
768 // many threads and/or very large heap, eventually thread stack will | |
769 // collide with heap. | |
770 // | |
771 // Here we try to prevent heap/stack collision by comparing current | |
772 // stack bottom with the highest address that has been mmap'ed by JVM | |
773 // plus a safety margin for memory maps created by native code. | |
774 // | |
775 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
776 // | |
777 if (ThreadSafetyMargin > 0) { | |
778 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
779 | |
780 // not safe if our stack extends below the safety margin | |
781 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
782 } else { | |
783 return true; | |
784 } | |
785 } else { | |
786 // Floating stack LinuxThreads or NPTL: | |
787 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
788 // there's not enough space left, pthread_create() will fail. If we come | |
789 // here, that means enough space has been reserved for stack. | |
790 return true; | |
791 } | |
792 } | |
793 | |
794 // Thread start routine for all newly created threads | |
795 static void *java_start(Thread *thread) { | |
796 // Try to randomize the cache line index of hot stack frames. | |
797 // This helps when threads of the same stack traces evict each other's | |
798 // cache lines. The threads can be either from the same JVM instance, or | |
799 // from different JVM instances. The benefit is especially true for | |
800 // processors with hyperthreading technology. | |
801 static int counter = 0; | |
802 int pid = os::current_process_id(); | |
803 alloca(((pid ^ counter++) & 7) * 128); | |
804 | |
805 ThreadLocalStorage::set_thread(thread); | |
806 | |
807 OSThread* osthread = thread->osthread(); | |
808 Monitor* sync = osthread->startThread_lock(); | |
809 | |
810 // non floating stack LinuxThreads needs extra check, see above | |
811 if (!_thread_safety_check(thread)) { | |
812 // notify parent thread | |
813 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
814 osthread->set_state(ZOMBIE); | |
815 sync->notify_all(); | |
816 return NULL; | |
817 } | |
818 | |
819 // thread_id is kernel thread id (similar to Solaris LWP id) | |
820 osthread->set_thread_id(os::Linux::gettid()); | |
821 | |
822 if (UseNUMA) { | |
823 int lgrp_id = os::numa_get_group_id(); | |
824 if (lgrp_id != -1) { | |
825 thread->set_lgrp_id(lgrp_id); | |
826 } | |
827 } | |
828 // initialize signal mask for this thread | |
829 os::Linux::hotspot_sigmask(thread); | |
830 | |
831 // initialize floating point control register | |
832 os::Linux::init_thread_fpu_state(); | |
833 | |
834 // handshaking with parent thread | |
835 { | |
836 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
837 | |
838 // notify parent thread | |
839 osthread->set_state(INITIALIZED); | |
840 sync->notify_all(); | |
841 | |
842 // wait until os::start_thread() | |
843 while (osthread->get_state() == INITIALIZED) { | |
844 sync->wait(Mutex::_no_safepoint_check_flag); | |
845 } | |
846 } | |
847 | |
848 // call one more level start routine | |
849 thread->run(); | |
850 | |
851 return 0; | |
852 } | |
853 | |
854 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
855 assert(thread->osthread() == NULL, "caller responsible"); | |
856 | |
857 // Allocate the OSThread object | |
858 OSThread* osthread = new OSThread(NULL, NULL); | |
859 if (osthread == NULL) { | |
860 return false; | |
861 } | |
862 | |
863 // set the correct thread state | |
864 osthread->set_thread_type(thr_type); | |
865 | |
866 // Initial state is ALLOCATED but not INITIALIZED | |
867 osthread->set_state(ALLOCATED); | |
868 | |
869 thread->set_osthread(osthread); | |
870 | |
871 // init thread attributes | |
872 pthread_attr_t attr; | |
873 pthread_attr_init(&attr); | |
874 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
875 | |
876 // stack size | |
877 if (os::Linux::supports_variable_stack_size()) { | |
878 // calculate stack size if it's not specified by caller | |
879 if (stack_size == 0) { | |
880 stack_size = os::Linux::default_stack_size(thr_type); | |
881 | |
882 switch (thr_type) { | |
883 case os::java_thread: | |
1867
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884 // Java threads use ThreadStackSize which default value can be |
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885 // changed with the flag -Xss |
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886 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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887 stack_size = JavaThread::stack_size_at_create(); |
0 | 888 break; |
889 case os::compiler_thread: | |
890 if (CompilerThreadStackSize > 0) { | |
891 stack_size = (size_t)(CompilerThreadStackSize * K); | |
892 break; | |
893 } // else fall through: | |
894 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
895 case os::vm_thread: | |
896 case os::pgc_thread: | |
897 case os::cgc_thread: | |
898 case os::watcher_thread: | |
899 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
900 break; | |
901 } | |
902 } | |
903 | |
904 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
905 pthread_attr_setstacksize(&attr, stack_size); | |
906 } else { | |
907 // let pthread_create() pick the default value. | |
908 } | |
909 | |
910 // glibc guard page | |
911 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
912 | |
913 ThreadState state; | |
914 | |
915 { | |
916 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
917 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
918 if (lock) { | |
919 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
920 } | |
921 | |
922 pthread_t tid; | |
923 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
924 | |
925 pthread_attr_destroy(&attr); | |
926 | |
927 if (ret != 0) { | |
928 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
929 perror("pthread_create()"); | |
930 } | |
931 // Need to clean up stuff we've allocated so far | |
932 thread->set_osthread(NULL); | |
933 delete osthread; | |
934 if (lock) os::Linux::createThread_lock()->unlock(); | |
935 return false; | |
936 } | |
937 | |
938 // Store pthread info into the OSThread | |
939 osthread->set_pthread_id(tid); | |
940 | |
941 // Wait until child thread is either initialized or aborted | |
942 { | |
943 Monitor* sync_with_child = osthread->startThread_lock(); | |
944 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
945 while ((state = osthread->get_state()) == ALLOCATED) { | |
946 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
947 } | |
948 } | |
949 | |
950 if (lock) { | |
951 os::Linux::createThread_lock()->unlock(); | |
952 } | |
953 } | |
954 | |
955 // Aborted due to thread limit being reached | |
956 if (state == ZOMBIE) { | |
957 thread->set_osthread(NULL); | |
958 delete osthread; | |
959 return false; | |
960 } | |
961 | |
962 // The thread is returned suspended (in state INITIALIZED), | |
963 // and is started higher up in the call chain | |
964 assert(state == INITIALIZED, "race condition"); | |
965 return true; | |
966 } | |
967 | |
968 ///////////////////////////////////////////////////////////////////////////// | |
969 // attach existing thread | |
970 | |
971 // bootstrap the main thread | |
972 bool os::create_main_thread(JavaThread* thread) { | |
973 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
974 return create_attached_thread(thread); | |
975 } | |
976 | |
977 bool os::create_attached_thread(JavaThread* thread) { | |
978 #ifdef ASSERT | |
979 thread->verify_not_published(); | |
980 #endif | |
981 | |
982 // Allocate the OSThread object | |
983 OSThread* osthread = new OSThread(NULL, NULL); | |
984 | |
985 if (osthread == NULL) { | |
986 return false; | |
987 } | |
988 | |
989 // Store pthread info into the OSThread | |
990 osthread->set_thread_id(os::Linux::gettid()); | |
991 osthread->set_pthread_id(::pthread_self()); | |
992 | |
993 // initialize floating point control register | |
994 os::Linux::init_thread_fpu_state(); | |
995 | |
996 // Initial thread state is RUNNABLE | |
997 osthread->set_state(RUNNABLE); | |
998 | |
999 thread->set_osthread(osthread); | |
1000 | |
1001 if (UseNUMA) { | |
1002 int lgrp_id = os::numa_get_group_id(); | |
1003 if (lgrp_id != -1) { | |
1004 thread->set_lgrp_id(lgrp_id); | |
1005 } | |
1006 } | |
1007 | |
1008 if (os::Linux::is_initial_thread()) { | |
1009 // If current thread is initial thread, its stack is mapped on demand, | |
1010 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
1011 // the entire stack region to avoid SEGV in stack banging. | |
1012 // It is also useful to get around the heap-stack-gap problem on SuSE | |
1013 // kernel (see 4821821 for details). We first expand stack to the top | |
1014 // of yellow zone, then enable stack yellow zone (order is significant, | |
1015 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
1016 // is no gap between the last two virtual memory regions. | |
1017 | |
1018 JavaThread *jt = (JavaThread *)thread; | |
1019 address addr = jt->stack_yellow_zone_base(); | |
1020 assert(addr != NULL, "initialization problem?"); | |
1021 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
1022 | |
1023 osthread->set_expanding_stack(); | |
1024 os::Linux::manually_expand_stack(jt, addr); | |
1025 osthread->clear_expanding_stack(); | |
1026 } | |
1027 | |
1028 // initialize signal mask for this thread | |
1029 // and save the caller's signal mask | |
1030 os::Linux::hotspot_sigmask(thread); | |
1031 | |
1032 return true; | |
1033 } | |
1034 | |
1035 void os::pd_start_thread(Thread* thread) { | |
1036 OSThread * osthread = thread->osthread(); | |
1037 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
1038 Monitor* sync_with_child = osthread->startThread_lock(); | |
1039 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
1040 sync_with_child->notify(); | |
1041 } | |
1042 | |
1043 // Free Linux resources related to the OSThread | |
1044 void os::free_thread(OSThread* osthread) { | |
1045 assert(osthread != NULL, "osthread not set"); | |
1046 | |
1047 if (Thread::current()->osthread() == osthread) { | |
1048 // Restore caller's signal mask | |
1049 sigset_t sigmask = osthread->caller_sigmask(); | |
1050 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1051 } | |
1052 | |
1053 delete osthread; | |
1054 } | |
1055 | |
1056 ////////////////////////////////////////////////////////////////////////////// | |
1057 // thread local storage | |
1058 | |
1059 int os::allocate_thread_local_storage() { | |
1060 pthread_key_t key; | |
1061 int rslt = pthread_key_create(&key, NULL); | |
1062 assert(rslt == 0, "cannot allocate thread local storage"); | |
1063 return (int)key; | |
1064 } | |
1065 | |
1066 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1067 // on VM exit. | |
1068 void os::free_thread_local_storage(int index) { | |
1069 int rslt = pthread_key_delete((pthread_key_t)index); | |
1070 assert(rslt == 0, "invalid index"); | |
1071 } | |
1072 | |
1073 void os::thread_local_storage_at_put(int index, void* value) { | |
1074 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1075 assert(rslt == 0, "pthread_setspecific failed"); | |
1076 } | |
1077 | |
1078 extern "C" Thread* get_thread() { | |
1079 return ThreadLocalStorage::thread(); | |
1080 } | |
1081 | |
1082 ////////////////////////////////////////////////////////////////////////////// | |
1083 // initial thread | |
1084 | |
1085 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
1086 bool os::Linux::is_initial_thread(void) { | |
1087 char dummy; | |
1088 // If called before init complete, thread stack bottom will be null. | |
1089 // Can be called if fatal error occurs before initialization. | |
1090 if (initial_thread_stack_bottom() == NULL) return false; | |
1091 assert(initial_thread_stack_bottom() != NULL && | |
1092 initial_thread_stack_size() != 0, | |
1093 "os::init did not locate initial thread's stack region"); | |
1094 if ((address)&dummy >= initial_thread_stack_bottom() && | |
1095 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
1096 return true; | |
1097 else return false; | |
1098 } | |
1099 | |
1100 // Find the virtual memory area that contains addr | |
1101 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
1102 FILE *fp = fopen("/proc/self/maps", "r"); | |
1103 if (fp) { | |
1104 address low, high; | |
1105 while (!feof(fp)) { | |
1106 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
1107 if (low <= addr && addr < high) { | |
1108 if (vma_low) *vma_low = low; | |
1109 if (vma_high) *vma_high = high; | |
1110 fclose (fp); | |
1111 return true; | |
1112 } | |
1113 } | |
1114 for (;;) { | |
1115 int ch = fgetc(fp); | |
1116 if (ch == EOF || ch == (int)'\n') break; | |
1117 } | |
1118 } | |
1119 fclose(fp); | |
1120 } | |
1121 return false; | |
1122 } | |
1123 | |
1124 // Locate initial thread stack. This special handling of initial thread stack | |
1125 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
1126 // bogus value for initial thread. | |
1127 void os::Linux::capture_initial_stack(size_t max_size) { | |
1128 // stack size is the easy part, get it from RLIMIT_STACK | |
1129 size_t stack_size; | |
1130 struct rlimit rlim; | |
1131 getrlimit(RLIMIT_STACK, &rlim); | |
1132 stack_size = rlim.rlim_cur; | |
1133 | |
1134 // 6308388: a bug in ld.so will relocate its own .data section to the | |
1135 // lower end of primordial stack; reduce ulimit -s value a little bit | |
1136 // so we won't install guard page on ld.so's data section. | |
1137 stack_size -= 2 * page_size(); | |
1138 | |
1139 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
1140 // 7.1, in both cases we will get 2G in return value. | |
1141 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
1142 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
1143 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
1144 // in case other parts in glibc still assumes 2M max stack size. | |
1145 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
1146 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
7994 | 1147 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
1148 stack_size = 2 * K * K IA64_ONLY(*2); | |
0 | 1149 // Try to figure out where the stack base (top) is. This is harder. |
1150 // | |
1151 // When an application is started, glibc saves the initial stack pointer in | |
1152 // a global variable "__libc_stack_end", which is then used by system | |
1153 // libraries. __libc_stack_end should be pretty close to stack top. The | |
1154 // variable is available since the very early days. However, because it is | |
1155 // a private interface, it could disappear in the future. | |
1156 // | |
1157 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
1158 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
1159 // stack top. Note that /proc may not exist if VM is running as a chroot | |
1160 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
1161 // /proc/<pid>/stat could change in the future (though unlikely). | |
1162 // | |
1163 // We try __libc_stack_end first. If that doesn't work, look for | |
1164 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
1165 // as a hint, which should work well in most cases. | |
1166 | |
1167 uintptr_t stack_start; | |
1168 | |
1169 // try __libc_stack_end first | |
1170 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
1171 if (p && *p) { | |
1172 stack_start = *p; | |
1173 } else { | |
1174 // see if we can get the start_stack field from /proc/self/stat | |
1175 FILE *fp; | |
1176 int pid; | |
1177 char state; | |
1178 int ppid; | |
1179 int pgrp; | |
1180 int session; | |
1181 int nr; | |
1182 int tpgrp; | |
1183 unsigned long flags; | |
1184 unsigned long minflt; | |
1185 unsigned long cminflt; | |
1186 unsigned long majflt; | |
1187 unsigned long cmajflt; | |
1188 unsigned long utime; | |
1189 unsigned long stime; | |
1190 long cutime; | |
1191 long cstime; | |
1192 long prio; | |
1193 long nice; | |
1194 long junk; | |
1195 long it_real; | |
1196 uintptr_t start; | |
1197 uintptr_t vsize; | |
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1198 intptr_t rss; |
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1199 uintptr_t rsslim; |
0 | 1200 uintptr_t scodes; |
1201 uintptr_t ecode; | |
1202 int i; | |
1203 | |
1204 // Figure what the primordial thread stack base is. Code is inspired | |
1205 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
1206 // followed by command name surrounded by parentheses, state, etc. | |
1207 char stat[2048]; | |
1208 int statlen; | |
1209 | |
1210 fp = fopen("/proc/self/stat", "r"); | |
1211 if (fp) { | |
1212 statlen = fread(stat, 1, 2047, fp); | |
1213 stat[statlen] = '\0'; | |
1214 fclose(fp); | |
1215 | |
1216 // Skip pid and the command string. Note that we could be dealing with | |
1217 // weird command names, e.g. user could decide to rename java launcher | |
1218 // to "java 1.4.2 :)", then the stat file would look like | |
1219 // 1234 (java 1.4.2 :)) R ... ... | |
1220 // We don't really need to know the command string, just find the last | |
1221 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
1222 char * s = strrchr(stat, ')'); | |
1223 | |
1224 i = 0; | |
1225 if (s) { | |
1226 // Skip blank chars | |
1227 do s++; while (isspace(*s)); | |
1228 | |
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1229 #define _UFM UINTX_FORMAT |
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1230 #define _DFM INTX_FORMAT |
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1231 |
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1232 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1233 /* 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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1234 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 | 1235 &state, /* 3 %c */ |
1236 &ppid, /* 4 %d */ | |
1237 &pgrp, /* 5 %d */ | |
1238 &session, /* 6 %d */ | |
1239 &nr, /* 7 %d */ | |
1240 &tpgrp, /* 8 %d */ | |
1241 &flags, /* 9 %lu */ | |
1242 &minflt, /* 10 %lu */ | |
1243 &cminflt, /* 11 %lu */ | |
1244 &majflt, /* 12 %lu */ | |
1245 &cmajflt, /* 13 %lu */ | |
1246 &utime, /* 14 %lu */ | |
1247 &stime, /* 15 %lu */ | |
1248 &cutime, /* 16 %ld */ | |
1249 &cstime, /* 17 %ld */ | |
1250 &prio, /* 18 %ld */ | |
1251 &nice, /* 19 %ld */ | |
1252 &junk, /* 20 %ld */ | |
1253 &it_real, /* 21 %ld */ | |
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1254 &start, /* 22 UINTX_FORMAT */ |
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1255 &vsize, /* 23 UINTX_FORMAT */ |
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1256 &rss, /* 24 INTX_FORMAT */ |
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1257 &rsslim, /* 25 UINTX_FORMAT */ |
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1258 &scodes, /* 26 UINTX_FORMAT */ |
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1259 &ecode, /* 27 UINTX_FORMAT */ |
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1260 &stack_start); /* 28 UINTX_FORMAT */ |
0 | 1261 } |
1262 | |
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1263 #undef _UFM |
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1264 #undef _DFM |
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1265 |
0 | 1266 if (i != 28 - 2) { |
1267 assert(false, "Bad conversion from /proc/self/stat"); | |
1268 // product mode - assume we are the initial thread, good luck in the | |
1269 // embedded case. | |
1270 warning("Can't detect initial thread stack location - bad conversion"); | |
1271 stack_start = (uintptr_t) &rlim; | |
1272 } | |
1273 } else { | |
1274 // For some reason we can't open /proc/self/stat (for example, running on | |
1275 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
1276 // most cases, so don't abort: | |
1277 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
1278 stack_start = (uintptr_t) &rlim; | |
1279 } | |
1280 } | |
1281 | |
1282 // Now we have a pointer (stack_start) very close to the stack top, the | |
1283 // next thing to do is to figure out the exact location of stack top. We | |
1284 // can find out the virtual memory area that contains stack_start by | |
1285 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
1286 // and its upper limit is the real stack top. (again, this would fail if | |
1287 // running inside chroot, because /proc may not exist.) | |
1288 | |
1289 uintptr_t stack_top; | |
1290 address low, high; | |
1291 if (find_vma((address)stack_start, &low, &high)) { | |
1292 // success, "high" is the true stack top. (ignore "low", because initial | |
1293 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
1294 stack_top = (uintptr_t)high; | |
1295 } else { | |
1296 // failed, likely because /proc/self/maps does not exist | |
1297 warning("Can't detect initial thread stack location - find_vma failed"); | |
1298 // best effort: stack_start is normally within a few pages below the real | |
1299 // stack top, use it as stack top, and reduce stack size so we won't put | |
1300 // guard page outside stack. | |
1301 stack_top = stack_start; | |
1302 stack_size -= 16 * page_size(); | |
1303 } | |
1304 | |
1305 // stack_top could be partially down the page so align it | |
1306 stack_top = align_size_up(stack_top, page_size()); | |
1307 | |
1308 if (max_size && stack_size > max_size) { | |
1309 _initial_thread_stack_size = max_size; | |
1310 } else { | |
1311 _initial_thread_stack_size = stack_size; | |
1312 } | |
1313 | |
1314 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
1315 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
1316 } | |
1317 | |
1318 //////////////////////////////////////////////////////////////////////////////// | |
1319 // time support | |
1320 | |
1321 // Time since start-up in seconds to a fine granularity. | |
1322 // Used by VMSelfDestructTimer and the MemProfiler. | |
1323 double os::elapsedTime() { | |
1324 | |
1325 return (double)(os::elapsed_counter()) * 0.000001; | |
1326 } | |
1327 | |
1328 jlong os::elapsed_counter() { | |
1329 timeval time; | |
1330 int status = gettimeofday(&time, NULL); | |
1331 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
1332 } | |
1333 | |
1334 jlong os::elapsed_frequency() { | |
1335 return (1000 * 1000); | |
1336 } | |
1337 | |
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1338 // For now, we say that linux does not support vtime. I have no idea |
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1339 // whether it can actually be made to (DLD, 9/13/05). |
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1340 |
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1341 bool os::supports_vtime() { return false; } |
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1342 bool os::enable_vtime() { return false; } |
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1343 bool os::vtime_enabled() { return false; } |
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1344 double os::elapsedVTime() { |
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1345 // better than nothing, but not much |
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1346 return elapsedTime(); |
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|
1347 } |
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1348 |
61 | 1349 jlong os::javaTimeMillis() { |
0 | 1350 timeval time; |
1351 int status = gettimeofday(&time, NULL); | |
1352 assert(status != -1, "linux error"); | |
1353 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1354 } | |
1355 | |
1356 #ifndef CLOCK_MONOTONIC | |
1357 #define CLOCK_MONOTONIC (1) | |
1358 #endif | |
1359 | |
1360 void os::Linux::clock_init() { | |
1361 // we do dlopen's in this particular order due to bug in linux | |
1362 // dynamical loader (see 6348968) leading to crash on exit | |
1363 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
1364 if (handle == NULL) { | |
1365 handle = dlopen("librt.so", RTLD_LAZY); | |
1366 } | |
1367 | |
1368 if (handle) { | |
1369 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
1370 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
1371 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
1372 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
1373 if (clock_getres_func && clock_gettime_func) { | |
1374 // See if monotonic clock is supported by the kernel. Note that some | |
1375 // early implementations simply return kernel jiffies (updated every | |
1376 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
1377 // for nano time (though the monotonic property is still nice to have). | |
1378 // It's fixed in newer kernels, however clock_getres() still returns | |
1379 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
1380 // resolution for now. Hopefully as people move to new kernels, this | |
1381 // won't be a problem. | |
1382 struct timespec res; | |
1383 struct timespec tp; | |
1384 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
1385 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
1386 // yes, monotonic clock is supported | |
1387 _clock_gettime = clock_gettime_func; | |
1388 } else { | |
1389 // close librt if there is no monotonic clock | |
1390 dlclose(handle); | |
1391 } | |
1392 } | |
1393 } | |
1394 } | |
1395 | |
1396 #ifndef SYS_clock_getres | |
1397 | |
1398 #if defined(IA32) || defined(AMD64) | |
1399 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
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1400 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1401 #else |
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1402 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
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1403 #define sys_clock_getres(x,y) -1 |
0 | 1404 #endif |
1405 | |
1681
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1406 #else |
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1407 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
0 | 1408 #endif |
1409 | |
1410 void os::Linux::fast_thread_clock_init() { | |
1411 if (!UseLinuxPosixThreadCPUClocks) { | |
1412 return; | |
1413 } | |
1414 clockid_t clockid; | |
1415 struct timespec tp; | |
1416 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
1417 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
1418 | |
1419 // Switch to using fast clocks for thread cpu time if | |
1420 // the sys_clock_getres() returns 0 error code. | |
1421 // Note, that some kernels may support the current thread | |
1422 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
1423 // returned by the pthread_getcpuclockid(). | |
1424 // If the fast Posix clocks are supported then the sys_clock_getres() | |
1425 // must return at least tp.tv_sec == 0 which means a resolution | |
1426 // better than 1 sec. This is extra check for reliability. | |
1427 | |
1428 if(pthread_getcpuclockid_func && | |
1429 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
1430 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
1431 | |
1432 _supports_fast_thread_cpu_time = true; | |
1433 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
1434 } | |
1435 } | |
1436 | |
1437 jlong os::javaTimeNanos() { | |
1438 if (Linux::supports_monotonic_clock()) { | |
1439 struct timespec tp; | |
1440 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1441 assert(status == 0, "gettime error"); | |
1442 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1443 return result; | |
1444 } else { | |
1445 timeval time; | |
1446 int status = gettimeofday(&time, NULL); | |
1447 assert(status != -1, "linux error"); | |
1448 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1449 return 1000 * usecs; | |
1450 } | |
1451 } | |
1452 | |
1453 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1454 if (Linux::supports_monotonic_clock()) { | |
1455 info_ptr->max_value = ALL_64_BITS; | |
1456 | |
1457 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1458 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1459 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1460 } else { | |
1461 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1462 info_ptr->max_value = ALL_64_BITS; | |
1463 | |
1464 // gettimeofday is a real time clock so it skips | |
1465 info_ptr->may_skip_backward = true; | |
1466 info_ptr->may_skip_forward = true; | |
1467 } | |
1468 | |
1469 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1470 } | |
1471 | |
1472 // Return the real, user, and system times in seconds from an | |
1473 // arbitrary fixed point in the past. | |
1474 bool os::getTimesSecs(double* process_real_time, | |
1475 double* process_user_time, | |
1476 double* process_system_time) { | |
1477 struct tms ticks; | |
1478 clock_t real_ticks = times(&ticks); | |
1479 | |
1480 if (real_ticks == (clock_t) (-1)) { | |
1481 return false; | |
1482 } else { | |
1483 double ticks_per_second = (double) clock_tics_per_sec; | |
1484 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1485 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1486 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1487 | |
1488 return true; | |
1489 } | |
1490 } | |
1491 | |
1492 | |
1493 char * os::local_time_string(char *buf, size_t buflen) { | |
1494 struct tm t; | |
1495 time_t long_time; | |
1496 time(&long_time); | |
1497 localtime_r(&long_time, &t); | |
1498 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1499 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1500 t.tm_hour, t.tm_min, t.tm_sec); | |
1501 return buf; | |
1502 } | |
1503 | |
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1504 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
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1505 return localtime_r(clock, res); |
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1506 } |
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1507 |
0 | 1508 //////////////////////////////////////////////////////////////////////////////// |
1509 // runtime exit support | |
1510 | |
1511 // Note: os::shutdown() might be called very early during initialization, or | |
1512 // called from signal handler. Before adding something to os::shutdown(), make | |
1513 // sure it is async-safe and can handle partially initialized VM. | |
1514 void os::shutdown() { | |
1515 | |
1516 // allow PerfMemory to attempt cleanup of any persistent resources | |
1517 perfMemory_exit(); | |
1518 | |
1519 // needs to remove object in file system | |
1520 AttachListener::abort(); | |
1521 | |
1522 // flush buffered output, finish log files | |
1523 ostream_abort(); | |
1524 | |
1525 // Check for abort hook | |
1526 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1527 if (abort_hook != NULL) { | |
1528 abort_hook(); | |
1529 } | |
1530 | |
1531 } | |
1532 | |
1533 // Note: os::abort() might be called very early during initialization, or | |
1534 // called from signal handler. Before adding something to os::abort(), make | |
1535 // sure it is async-safe and can handle partially initialized VM. | |
1536 void os::abort(bool dump_core) { | |
1537 os::shutdown(); | |
1538 if (dump_core) { | |
1539 #ifndef PRODUCT | |
1540 fdStream out(defaultStream::output_fd()); | |
1541 out.print_raw("Current thread is "); | |
1542 char buf[16]; | |
1543 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1544 out.print_raw_cr(buf); | |
1545 out.print_raw_cr("Dumping core ..."); | |
1546 #endif | |
1547 ::abort(); // dump core | |
1548 } | |
1549 | |
1550 ::exit(1); | |
1551 } | |
1552 | |
1553 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1554 void os::die() { | |
1555 // _exit() on LinuxThreads only kills current thread | |
1556 ::abort(); | |
1557 } | |
1558 | |
1559 // unused on linux for now. | |
1560 void os::set_error_file(const char *logfile) {} | |
1561 | |
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1562 |
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1563 // This method is a copy of JDK's sysGetLastErrorString |
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1564 // from src/solaris/hpi/src/system_md.c |
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|
1565 |
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|
1566 size_t os::lasterror(char *buf, size_t len) { |
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|
1567 |
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|
1568 if (errno == 0) return 0; |
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|
1569 |
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|
1570 const char *s = ::strerror(errno); |
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diff
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|
1571 size_t n = ::strlen(s); |
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diff
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|
1572 if (n >= len) { |
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|
1573 n = len - 1; |
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|
1574 } |
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diff
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|
1575 ::strncpy(buf, s, n); |
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diff
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|
1576 buf[n] = '\0'; |
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|
1577 return n; |
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|
1578 } |
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|
1579 |
0 | 1580 intx os::current_thread_id() { return (intx)pthread_self(); } |
1581 int os::current_process_id() { | |
1582 | |
1583 // Under the old linux thread library, linux gives each thread | |
1584 // its own process id. Because of this each thread will return | |
1585 // a different pid if this method were to return the result | |
1586 // of getpid(2). Linux provides no api that returns the pid | |
1587 // of the launcher thread for the vm. This implementation | |
1588 // returns a unique pid, the pid of the launcher thread | |
1589 // that starts the vm 'process'. | |
1590 | |
1591 // Under the NPTL, getpid() returns the same pid as the | |
1592 // launcher thread rather than a unique pid per thread. | |
1593 // Use gettid() if you want the old pre NPTL behaviour. | |
1594 | |
1595 // if you are looking for the result of a call to getpid() that | |
1596 // returns a unique pid for the calling thread, then look at the | |
1597 // OSThread::thread_id() method in osThread_linux.hpp file | |
1598 | |
1599 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1600 } | |
1601 | |
1602 // DLL functions | |
1603 | |
1604 const char* os::dll_file_extension() { return ".so"; } | |
1605 | |
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1606 // This must be hard coded because it's the system's temporary |
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1607 // directory not the java application's temp directory, ala java.io.tmpdir. |
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1608 const char* os::get_temp_directory() { return "/tmp"; } |
0 | 1609 |
691 | 1610 static bool file_exists(const char* filename) { |
1611 struct stat statbuf; | |
1612 if (filename == NULL || strlen(filename) == 0) { | |
1613 return false; | |
1614 } | |
1615 return os::stat(filename, &statbuf) == 0; | |
1616 } | |
1617 | |
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1618 bool os::dll_build_name(char* buffer, size_t buflen, |
691 | 1619 const char* pname, const char* fname) { |
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1620 bool retval = false; |
691 | 1621 // Copied from libhpi |
242 | 1622 const size_t pnamelen = pname ? strlen(pname) : 0; |
1623 | |
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1624 // Return error on buffer overflow. |
242 | 1625 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
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1626 return retval; |
242 | 1627 } |
1628 | |
1629 if (pnamelen == 0) { | |
691 | 1630 snprintf(buffer, buflen, "lib%s.so", fname); |
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1631 retval = true; |
691 | 1632 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1633 int n; | |
1634 char** pelements = split_path(pname, &n); | |
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1635 if (pelements == NULL) { |
9062 | 1636 return false; |
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|
1637 } |
691 | 1638 for (int i = 0 ; i < n ; i++) { |
1639 // Really shouldn't be NULL, but check can't hurt | |
1640 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1641 continue; // skip the empty path values | |
1642 } | |
1643 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1644 if (file_exists(buffer)) { | |
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1645 retval = true; |
691 | 1646 break; |
1647 } | |
1648 } | |
1649 // release the storage | |
1650 for (int i = 0 ; i < n ; i++) { | |
1651 if (pelements[i] != NULL) { | |
6197 | 1652 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
691 | 1653 } |
1654 } | |
1655 if (pelements != NULL) { | |
6197 | 1656 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
691 | 1657 } |
242 | 1658 } else { |
691 | 1659 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
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1660 retval = true; |
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1661 } |
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1662 return retval; |
242 | 1663 } |
1664 | |
0 | 1665 const char* os::get_current_directory(char *buf, int buflen) { |
1666 return getcwd(buf, buflen); | |
1667 } | |
1668 | |
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1669 // check if addr is inside libjvm.so |
0 | 1670 bool os::address_is_in_vm(address addr) { |
1671 static address libjvm_base_addr; | |
1672 Dl_info dlinfo; | |
1673 | |
1674 if (libjvm_base_addr == NULL) { | |
1675 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
1676 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
1677 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
1678 } | |
1679 | |
1680 if (dladdr((void *)addr, &dlinfo)) { | |
1681 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
1682 } | |
1683 | |
1684 return false; | |
1685 } | |
1686 | |
1687 bool os::dll_address_to_function_name(address addr, char *buf, | |
1688 int buflen, int *offset) { | |
1689 Dl_info dlinfo; | |
1690 | |
1691 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { | |
2022
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1692 if (buf != NULL) { |
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1693 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
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1694 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
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1695 } |
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1696 } |
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1697 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
0 | 1698 return true; |
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1699 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { |
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1700 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
4803 | 1701 buf, buflen, offset, dlinfo.dli_fname)) { |
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1702 return true; |
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1703 } |
0 | 1704 } |
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1705 |
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1706 if (buf != NULL) buf[0] = '\0'; |
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1707 if (offset != NULL) *offset = -1; |
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1708 return false; |
0 | 1709 } |
1710 | |
1711 struct _address_to_library_name { | |
1712 address addr; // input : memory address | |
1713 size_t buflen; // size of fname | |
1714 char* fname; // output: library name | |
1715 address base; // library base addr | |
1716 }; | |
1717 | |
1718 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
1719 size_t size, void *data) { | |
1720 int i; | |
1721 bool found = false; | |
1722 address libbase = NULL; | |
1723 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
1724 | |
1725 // iterate through all loadable segments | |
1726 for (i = 0; i < info->dlpi_phnum; i++) { | |
1727 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
1728 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
1729 // base address of a library is the lowest address of its loaded | |
1730 // segments. | |
1731 if (libbase == NULL || libbase > segbase) { | |
1732 libbase = segbase; | |
1733 } | |
1734 // see if 'addr' is within current segment | |
1735 if (segbase <= d->addr && | |
1736 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
1737 found = true; | |
1738 } | |
1739 } | |
1740 } | |
1741 | |
1742 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
1743 // so dll_address_to_library_name() can fall through to use dladdr() which | |
1744 // can figure out executable name from argv[0]. | |
1745 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
1746 d->base = libbase; | |
1747 if (d->fname) { | |
1748 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
1749 } | |
1750 return 1; | |
1751 } | |
1752 return 0; | |
1753 } | |
1754 | |
1755 bool os::dll_address_to_library_name(address addr, char* buf, | |
1756 int buflen, int* offset) { | |
1757 Dl_info dlinfo; | |
1758 struct _address_to_library_name data; | |
1759 | |
1760 // There is a bug in old glibc dladdr() implementation that it could resolve | |
1761 // to wrong library name if the .so file has a base address != NULL. Here | |
1762 // we iterate through the program headers of all loaded libraries to find | |
1763 // out which library 'addr' really belongs to. This workaround can be | |
1764 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
1765 data.addr = addr; | |
1766 data.fname = buf; | |
1767 data.buflen = buflen; | |
1768 data.base = NULL; | |
1769 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
1770 | |
1771 if (rslt) { | |
1772 // buf already contains library name | |
1773 if (offset) *offset = addr - data.base; | |
1774 return true; | |
1775 } else if (dladdr((void*)addr, &dlinfo)){ | |
1776 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
1777 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
1778 return true; | |
1779 } else { | |
1780 if (buf) buf[0] = '\0'; | |
1781 if (offset) *offset = -1; | |
1782 return false; | |
1783 } | |
1784 } | |
1785 | |
1786 // Loads .dll/.so and | |
1787 // in case of error it checks if .dll/.so was built for the | |
1788 // same architecture as Hotspot is running on | |
1789 | |
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1790 |
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1791 // Remember the stack's state. The Linux dynamic linker will change |
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1792 // the stack to 'executable' at most once, so we must safepoint only once. |
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1793 bool os::Linux::_stack_is_executable = false; |
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1794 |
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1795 // VM operation that loads a library. This is necessary if stack protection |
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1796 // of the Java stacks can be lost during loading the library. If we |
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1797 // do not stop the Java threads, they can stack overflow before the stacks |
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1798 // are protected again. |
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1799 class VM_LinuxDllLoad: public VM_Operation { |
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1800 private: |
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1801 const char *_filename; |
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1802 char *_ebuf; |
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1803 int _ebuflen; |
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1804 void *_lib; |
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1805 public: |
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1806 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
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1807 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
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1808 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
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1809 void doit() { |
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1810 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
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1811 os::Linux::_stack_is_executable = true; |
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1812 } |
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1813 void* loaded_library() { return _lib; } |
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1814 }; |
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1815 |
0 | 1816 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
1817 { | |
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1818 void * result = NULL; |
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1819 bool load_attempted = false; |
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1820 |
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1821 // Check whether the library to load might change execution rights |
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1822 // of the stack. If they are changed, the protection of the stack |
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1823 // guard pages will be lost. We need a safepoint to fix this. |
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1824 // |
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1825 // See Linux man page execstack(8) for more info. |
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1826 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
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1827 ElfFile ef(filename); |
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1828 if (!ef.specifies_noexecstack()) { |
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1829 if (!is_init_completed()) { |
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1830 os::Linux::_stack_is_executable = true; |
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1831 // This is OK - No Java threads have been created yet, and hence no |
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1832 // stack guard pages to fix. |
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1833 // |
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1834 // This should happen only when you are building JDK7 using a very |
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1835 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
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1836 // |
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1837 // Dynamic loader will make all stacks executable after |
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1838 // this function returns, and will not do that again. |
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1839 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
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1840 } else { |
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1841 warning("You have loaded library %s which might have disabled stack guard. " |
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1842 "The VM will try to fix the stack guard now.\n" |
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1843 "It's highly recommended that you fix the library with " |
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1844 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
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1845 filename); |
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1846 |
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1847 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
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1848 JavaThread *jt = JavaThread::current(); |
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1849 if (jt->thread_state() != _thread_in_native) { |
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1850 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
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1851 // that requires ExecStack. Cannot enter safe point. Let's give up. |
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1852 warning("Unable to fix stack guard. Giving up."); |
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1853 } else { |
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1854 if (!LoadExecStackDllInVMThread) { |
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1855 // This is for the case where the DLL has an static |
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1856 // constructor function that executes JNI code. We cannot |
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1857 // load such DLLs in the VMThread. |
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1858 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1859 } |
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1860 |
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1861 ThreadInVMfromNative tiv(jt); |
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1862 debug_only(VMNativeEntryWrapper vew;) |
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1863 |
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1864 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1865 VMThread::execute(&op); |
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1866 if (LoadExecStackDllInVMThread) { |
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1867 result = op.loaded_library(); |
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1868 } |
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1869 load_attempted = true; |
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1870 } |
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1871 } |
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1872 } |
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1873 } |
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1874 |
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1875 if (!load_attempted) { |
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1876 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1877 } |
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1878 |
0 | 1879 if (result != NULL) { |
1880 // Successful loading | |
1881 return result; | |
1882 } | |
1883 | |
1884 Elf32_Ehdr elf_head; | |
1885 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1886 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1887 | |
1888 if (diag_msg_max_length==0) { | |
1889 // No more space in ebuf for additional diagnostics message | |
1890 return NULL; | |
1891 } | |
1892 | |
1893 | |
1894 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1895 | |
1896 if (file_descriptor < 0) { | |
1897 // Can't open library, report dlerror() message | |
1898 return NULL; | |
1899 } | |
1900 | |
1901 bool failed_to_read_elf_head= | |
1902 (sizeof(elf_head)!= | |
1903 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1904 | |
1905 ::close(file_descriptor); | |
1906 if (failed_to_read_elf_head) { | |
1907 // file i/o error - report dlerror() msg | |
1908 return NULL; | |
1909 } | |
1910 | |
1911 typedef struct { | |
1912 Elf32_Half code; // Actual value as defined in elf.h | |
1913 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1914 char elf_class; // 32 or 64 bit | |
1915 char endianess; // MSB or LSB | |
1916 char* name; // String representation | |
1917 } arch_t; | |
1918 | |
1919 #ifndef EM_486 | |
1920 #define EM_486 6 /* Intel 80486 */ | |
1921 #endif | |
1922 | |
1923 static const arch_t arch_array[]={ | |
1924 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1925 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1926 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1927 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1928 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1929 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1930 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1931 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1010 | 1932 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
1933 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1934 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1935 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1936 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1937 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1938 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1939 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
0 | 1940 }; |
1941 | |
1942 #if (defined IA32) | |
1943 static Elf32_Half running_arch_code=EM_386; | |
1944 #elif (defined AMD64) | |
1945 static Elf32_Half running_arch_code=EM_X86_64; | |
1946 #elif (defined IA64) | |
1947 static Elf32_Half running_arch_code=EM_IA_64; | |
1948 #elif (defined __sparc) && (defined _LP64) | |
1949 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1950 #elif (defined __sparc) && (!defined _LP64) | |
1951 static Elf32_Half running_arch_code=EM_SPARC; | |
1952 #elif (defined __powerpc64__) | |
1953 static Elf32_Half running_arch_code=EM_PPC64; | |
1954 #elif (defined __powerpc__) | |
1955 static Elf32_Half running_arch_code=EM_PPC; | |
1010 | 1956 #elif (defined ARM) |
1957 static Elf32_Half running_arch_code=EM_ARM; | |
1958 #elif (defined S390) | |
1959 static Elf32_Half running_arch_code=EM_S390; | |
1960 #elif (defined ALPHA) | |
1961 static Elf32_Half running_arch_code=EM_ALPHA; | |
1962 #elif (defined MIPSEL) | |
1963 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1964 #elif (defined PARISC) | |
1965 static Elf32_Half running_arch_code=EM_PARISC; | |
1966 #elif (defined MIPS) | |
1967 static Elf32_Half running_arch_code=EM_MIPS; | |
1968 #elif (defined M68K) | |
1969 static Elf32_Half running_arch_code=EM_68K; | |
0 | 1970 #else |
1971 #error Method os::dll_load requires that one of following is defined:\ | |
1010 | 1972 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
0 | 1973 #endif |
1974 | |
1975 // Identify compatability class for VM's architecture and library's architecture | |
1976 // Obtain string descriptions for architectures | |
1977 | |
1978 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1979 int running_arch_index=-1; | |
1980 | |
1981 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1982 if (running_arch_code == arch_array[i].code) { | |
1983 running_arch_index = i; | |
1984 } | |
1985 if (lib_arch.code == arch_array[i].code) { | |
1986 lib_arch.compat_class = arch_array[i].compat_class; | |
1987 lib_arch.name = arch_array[i].name; | |
1988 } | |
1989 } | |
1990 | |
1991 assert(running_arch_index != -1, | |
1992 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1993 if (running_arch_index == -1) { | |
1994 // Even though running architecture detection failed | |
1995 // we may still continue with reporting dlerror() message | |
1996 return NULL; | |
1997 } | |
1998 | |
1999 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
2000 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
2001 return NULL; | |
2002 } | |
2003 | |
1010 | 2004 #ifndef S390 |
0 | 2005 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
2006 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
2007 return NULL; | |
2008 } | |
1010 | 2009 #endif // !S390 |
0 | 2010 |
2011 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
2012 if ( lib_arch.name!=NULL ) { | |
2013 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2014 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
2015 lib_arch.name, arch_array[running_arch_index].name); | |
2016 } else { | |
2017 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
2018 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
2019 lib_arch.code, | |
2020 arch_array[running_arch_index].name); | |
2021 } | |
2022 } | |
2023 | |
2024 return NULL; | |
2025 } | |
2026 | |
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2027 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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2028 void * result = ::dlopen(filename, RTLD_LAZY); |
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2029 if (result == NULL) { |
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2030 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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2031 ebuf[ebuflen-1] = '\0'; |
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2032 } |
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2033 return result; |
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2034 } |
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2035 |
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2036 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
8710
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2037 void * result = NULL; |
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2038 if (LoadExecStackDllInVMThread) { |
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2039 result = dlopen_helper(filename, ebuf, ebuflen); |
8710
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2040 } |
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2041 |
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2042 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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2043 // library that requires an executable stack, or which does not have this |
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2044 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2045 // read protection of the guard pages gets lost. |
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2046 // |
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2047 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2048 // may have been queued at the same time. |
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2049 |
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2050 if (!_stack_is_executable) { |
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2051 JavaThread *jt = Threads::first(); |
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2052 |
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2053 while (jt) { |
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2054 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2055 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2056 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2057 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2058 warning("Attempt to reguard stack yellow zone failed."); |
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2059 } |
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2060 } |
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2061 jt = jt->next(); |
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2062 } |
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2063 } |
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2064 |
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2065 return result; |
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2066 } |
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2067 |
242 | 2068 /* |
2069 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
2070 * chances are you might want to run the generated bits against glibc-2.0 | |
2071 * libdl.so, so always use locking for any version of glibc. | |
2072 */ | |
2073 void* os::dll_lookup(void* handle, const char* name) { | |
2074 pthread_mutex_lock(&dl_mutex); | |
2075 void* res = dlsym(handle, name); | |
2076 pthread_mutex_unlock(&dl_mutex); | |
2077 return res; | |
2078 } | |
0 | 2079 |
2080 | |
1980
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2081 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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2082 int fd = ::open(filename, O_RDONLY); |
0 | 2083 if (fd == -1) { |
2084 return false; | |
2085 } | |
2086 | |
2087 char buf[32]; | |
2088 int bytes; | |
1980
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2089 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
0 | 2090 st->print_raw(buf, bytes); |
2091 } | |
2092 | |
1980
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2093 ::close(fd); |
0 | 2094 |
2095 return true; | |
2096 } | |
2097 | |
2098 void os::print_dll_info(outputStream *st) { | |
2099 st->print_cr("Dynamic libraries:"); | |
2100 | |
2101 char fname[32]; | |
2102 pid_t pid = os::Linux::gettid(); | |
2103 | |
2104 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
2105 | |
2106 if (!_print_ascii_file(fname, st)) { | |
2107 st->print("Can not get library information for pid = %d\n", pid); | |
2108 } | |
2109 } | |
2110 | |
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2111 void os::print_os_info_brief(outputStream* st) { |
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2112 os::Linux::print_distro_info(st); |
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2113 |
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2114 os::Posix::print_uname_info(st); |
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2115 |
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2116 os::Linux::print_libversion_info(st); |
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2117 |
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2118 } |
0 | 2119 |
2120 void os::print_os_info(outputStream* st) { | |
2121 st->print("OS:"); | |
2122 | |
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2123 os::Linux::print_distro_info(st); |
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2124 |
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2125 os::Posix::print_uname_info(st); |
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2126 |
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2127 // Print warning if unsafe chroot environment detected |
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2128 if (unsafe_chroot_detected) { |
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2129 st->print("WARNING!! "); |
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2130 st->print_cr(unstable_chroot_error); |
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2131 } |
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2132 |
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2133 os::Linux::print_libversion_info(st); |
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2134 |
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2135 os::Posix::print_rlimit_info(st); |
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2136 |
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2137 os::Posix::print_load_average(st); |
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2138 |
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2139 os::Linux::print_full_memory_info(st); |
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2140 } |
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2141 |
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2142 // Try to identify popular distros. |
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2143 // Most Linux distributions have /etc/XXX-release file, which contains |
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2144 // the OS version string. Some have more than one /etc/XXX-release file |
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2145 // (e.g. Mandrake has both /etc/mandrake-release and /etc/redhat-release.), |
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2146 // so the order is important. |
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|
2147 void os::Linux::print_distro_info(outputStream* st) { |
0 | 2148 if (!_print_ascii_file("/etc/mandrake-release", st) && |
2149 !_print_ascii_file("/etc/sun-release", st) && | |
2150 !_print_ascii_file("/etc/redhat-release", st) && | |
2151 !_print_ascii_file("/etc/SuSE-release", st) && | |
2152 !_print_ascii_file("/etc/turbolinux-release", st) && | |
2153 !_print_ascii_file("/etc/gentoo-release", st) && | |
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2154 !_print_ascii_file("/etc/debian_version", st) && |
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2155 !_print_ascii_file("/etc/ltib-release", st) && |
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2156 !_print_ascii_file("/etc/angstrom-version", st)) { |
0 | 2157 st->print("Linux"); |
2158 } | |
2159 st->cr(); | |
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2160 } |
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2161 |
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2162 void os::Linux::print_libversion_info(outputStream* st) { |
0 | 2163 // libc, pthread |
2164 st->print("libc:"); | |
2165 st->print(os::Linux::glibc_version()); st->print(" "); | |
2166 st->print(os::Linux::libpthread_version()); st->print(" "); | |
2167 if (os::Linux::is_LinuxThreads()) { | |
2168 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
2169 } | |
2170 st->cr(); | |
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2171 } |
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2172 |
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2173 void os::Linux::print_full_memory_info(outputStream* st) { |
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2174 st->print("\n/proc/meminfo:\n"); |
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2175 _print_ascii_file("/proc/meminfo", st); |
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2176 st->cr(); |
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2177 } |
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2178 |
0 | 2179 void os::print_memory_info(outputStream* st) { |
2180 | |
2181 st->print("Memory:"); | |
2182 st->print(" %dk page", os::vm_page_size()>>10); | |
2183 | |
2184 // values in struct sysinfo are "unsigned long" | |
2185 struct sysinfo si; | |
2186 sysinfo(&si); | |
2187 | |
2188 st->print(", physical " UINT64_FORMAT "k", | |
2189 os::physical_memory() >> 10); | |
2190 st->print("(" UINT64_FORMAT "k free)", | |
2191 os::available_memory() >> 10); | |
2192 st->print(", swap " UINT64_FORMAT "k", | |
2193 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
2194 st->print("(" UINT64_FORMAT "k free)", | |
2195 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
2196 st->cr(); | |
2197 } | |
2198 | |
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2199 void os::pd_print_cpu_info(outputStream* st) { |
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2200 st->print("\n/proc/cpuinfo:\n"); |
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2201 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
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2202 st->print(" <Not Available>"); |
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2203 } |
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2204 st->cr(); |
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2205 } |
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2206 |
0 | 2207 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific |
2208 // but they're the same for all the linux arch that we support | |
2209 // and they're the same for solaris but there's no common place to put this. | |
2210 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
2211 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
2212 "ILL_COPROC", "ILL_BADSTK" }; | |
2213 | |
2214 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
2215 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
2216 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
2217 | |
2218 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
2219 | |
2220 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
2221 | |
2222 void os::print_siginfo(outputStream* st, void* siginfo) { | |
2223 st->print("siginfo:"); | |
2224 | |
2225 const int buflen = 100; | |
2226 char buf[buflen]; | |
2227 siginfo_t *si = (siginfo_t*)siginfo; | |
2228 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
2229 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
2230 st->print("si_errno=%s", buf); | |
2231 } else { | |
2232 st->print("si_errno=%d", si->si_errno); | |
2233 } | |
2234 const int c = si->si_code; | |
2235 assert(c > 0, "unexpected si_code"); | |
2236 switch (si->si_signo) { | |
2237 case SIGILL: | |
2238 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
2239 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2240 break; | |
2241 case SIGFPE: | |
2242 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
2243 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2244 break; | |
2245 case SIGSEGV: | |
2246 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
2247 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2248 break; | |
2249 case SIGBUS: | |
2250 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
2251 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
2252 break; | |
2253 default: | |
2254 st->print(", si_code=%d", si->si_code); | |
2255 // no si_addr | |
2256 } | |
2257 | |
2258 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
2259 UseSharedSpaces) { | |
2260 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
2261 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
2262 st->print("\n\nError accessing class data sharing archive." \ | |
2263 " Mapped file inaccessible during execution, " \ | |
2264 " possible disk/network problem."); | |
2265 } | |
2266 } | |
2267 st->cr(); | |
2268 } | |
2269 | |
2270 | |
2271 static void print_signal_handler(outputStream* st, int sig, | |
2272 char* buf, size_t buflen); | |
2273 | |
2274 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
2275 st->print_cr("Signal Handlers:"); | |
2276 print_signal_handler(st, SIGSEGV, buf, buflen); | |
2277 print_signal_handler(st, SIGBUS , buf, buflen); | |
2278 print_signal_handler(st, SIGFPE , buf, buflen); | |
2279 print_signal_handler(st, SIGPIPE, buf, buflen); | |
2280 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
2281 print_signal_handler(st, SIGILL , buf, buflen); | |
2282 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
2283 print_signal_handler(st, SR_signum, buf, buflen); | |
2284 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
2285 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
2286 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
2287 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
2288 } | |
2289 | |
2290 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
2291 | |
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2292 // Find the full path to the current module, libjvm.so |
1642 | 2293 void os::jvm_path(char *buf, jint buflen) { |
0 | 2294 // Error checking. |
1642 | 2295 if (buflen < MAXPATHLEN) { |
0 | 2296 assert(false, "must use a large-enough buffer"); |
2297 buf[0] = '\0'; | |
2298 return; | |
2299 } | |
2300 // Lazy resolve the path to current module. | |
2301 if (saved_jvm_path[0] != 0) { | |
2302 strcpy(buf, saved_jvm_path); | |
2303 return; | |
2304 } | |
2305 | |
2306 char dli_fname[MAXPATHLEN]; | |
2307 bool ret = dll_address_to_library_name( | |
2308 CAST_FROM_FN_PTR(address, os::jvm_path), | |
2309 dli_fname, sizeof(dli_fname), NULL); | |
2310 assert(ret != 0, "cannot locate libjvm"); | |
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2311 char *rp = realpath(dli_fname, buf); |
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2312 if (rp == NULL) |
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2313 return; |
0 | 2314 |
2302
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2315 if (Arguments::created_by_gamma_launcher()) { |
0 | 2316 // Support for the gamma launcher. Typical value for buf is |
2317 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
2318 // the right place in the string, then assume we are installed in a JDK and | |
2319 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
2320 // up the path so it looks like libjvm.so is installed there (append a | |
2321 // fake suffix hotspot/libjvm.so). | |
2322 const char *p = buf + strlen(buf) - 1; | |
2323 for (int count = 0; p > buf && count < 5; ++count) { | |
2324 for (--p; p > buf && *p != '/'; --p) | |
2325 /* empty */ ; | |
2326 } | |
2327 | |
2328 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
2329 // Look for JAVA_HOME in the environment. | |
2330 char* java_home_var = ::getenv("JAVA_HOME"); | |
2331 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1642 | 2332 char* jrelib_p; |
2333 int len; | |
2334 | |
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2335 // Check the current module name "libjvm.so". |
0 | 2336 p = strrchr(buf, '/'); |
2337 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
2338 | |
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2339 rp = realpath(java_home_var, buf); |
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2340 if (rp == NULL) |
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2341 return; |
1642 | 2342 |
2343 // determine if this is a legacy image or modules image | |
2344 // modules image doesn't have "jre" subdirectory | |
2345 len = strlen(buf); | |
2346 jrelib_p = buf + len; | |
2347 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
2348 if (0 != access(buf, F_OK)) { | |
2349 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
2350 } | |
2351 | |
0 | 2352 if (0 == access(buf, F_OK)) { |
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2353 // Use current module name "libjvm.so" |
1642 | 2354 len = strlen(buf); |
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2355 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
0 | 2356 } else { |
2357 // Go back to path of .so | |
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2358 rp = realpath(dli_fname, buf); |
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2359 if (rp == NULL) |
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2360 return; |
0 | 2361 } |
2362 } | |
2363 } | |
2364 } | |
2365 | |
2366 strcpy(saved_jvm_path, buf); | |
2367 } | |
2368 | |
2369 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
2370 // no prefix required, not even "_" | |
2371 } | |
2372 | |
2373 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
2374 // no suffix required | |
2375 } | |
2376 | |
2377 //////////////////////////////////////////////////////////////////////////////// | |
2378 // sun.misc.Signal support | |
2379 | |
2380 static volatile jint sigint_count = 0; | |
2381 | |
2382 static void | |
2383 UserHandler(int sig, void *siginfo, void *context) { | |
2384 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
2385 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
2386 // don't want to flood the manager thread with sem_post requests. | |
2387 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
2388 return; | |
2389 | |
2390 // Ctrl-C is pressed during error reporting, likely because the error | |
2391 // handler fails to abort. Let VM die immediately. | |
2392 if (sig == SIGINT && is_error_reported()) { | |
2393 os::die(); | |
2394 } | |
2395 | |
2396 os::signal_notify(sig); | |
2397 } | |
2398 | |
2399 void* os::user_handler() { | |
2400 return CAST_FROM_FN_PTR(void*, UserHandler); | |
2401 } | |
2402 | |
2403 extern "C" { | |
2404 typedef void (*sa_handler_t)(int); | |
2405 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
2406 } | |
2407 | |
2408 void* os::signal(int signal_number, void* handler) { | |
2409 struct sigaction sigAct, oldSigAct; | |
2410 | |
2411 sigfillset(&(sigAct.sa_mask)); | |
2412 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
2413 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
2414 | |
2415 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
2416 // -1 means registration failed | |
2417 return (void *)-1; | |
2418 } | |
2419 | |
2420 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
2421 } | |
2422 | |
2423 void os::signal_raise(int signal_number) { | |
2424 ::raise(signal_number); | |
2425 } | |
2426 | |
2427 /* | |
2428 * The following code is moved from os.cpp for making this | |
2429 * code platform specific, which it is by its very nature. | |
2430 */ | |
2431 | |
2432 // Will be modified when max signal is changed to be dynamic | |
2433 int os::sigexitnum_pd() { | |
2434 return NSIG; | |
2435 } | |
2436 | |
2437 // a counter for each possible signal value | |
2438 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
2439 | |
2440 // Linux(POSIX) specific hand shaking semaphore. | |
2441 static sem_t sig_sem; | |
2442 | |
2443 void os::signal_init_pd() { | |
2444 // Initialize signal structures | |
2445 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2446 | |
2447 // Initialize signal semaphore | |
2448 ::sem_init(&sig_sem, 0, 0); | |
2449 } | |
2450 | |
2451 void os::signal_notify(int sig) { | |
2452 Atomic::inc(&pending_signals[sig]); | |
2453 ::sem_post(&sig_sem); | |
2454 } | |
2455 | |
2456 static int check_pending_signals(bool wait) { | |
2457 Atomic::store(0, &sigint_count); | |
2458 for (;;) { | |
2459 for (int i = 0; i < NSIG + 1; i++) { | |
2460 jint n = pending_signals[i]; | |
2461 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2462 return i; | |
2463 } | |
2464 } | |
2465 if (!wait) { | |
2466 return -1; | |
2467 } | |
2468 JavaThread *thread = JavaThread::current(); | |
2469 ThreadBlockInVM tbivm(thread); | |
2470 | |
2471 bool threadIsSuspended; | |
2472 do { | |
2473 thread->set_suspend_equivalent(); | |
2474 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2475 ::sem_wait(&sig_sem); | |
2476 | |
2477 // were we externally suspended while we were waiting? | |
2478 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2479 if (threadIsSuspended) { | |
2480 // | |
2481 // The semaphore has been incremented, but while we were waiting | |
2482 // another thread suspended us. We don't want to continue running | |
2483 // while suspended because that would surprise the thread that | |
2484 // suspended us. | |
2485 // | |
2486 ::sem_post(&sig_sem); | |
2487 | |
2488 thread->java_suspend_self(); | |
2489 } | |
2490 } while (threadIsSuspended); | |
2491 } | |
2492 } | |
2493 | |
2494 int os::signal_lookup() { | |
2495 return check_pending_signals(false); | |
2496 } | |
2497 | |
2498 int os::signal_wait() { | |
2499 return check_pending_signals(true); | |
2500 } | |
2501 | |
2502 //////////////////////////////////////////////////////////////////////////////// | |
2503 // Virtual Memory | |
2504 | |
2505 int os::vm_page_size() { | |
2506 // Seems redundant as all get out | |
2507 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2508 return os::Linux::page_size(); | |
2509 } | |
2510 | |
2511 // Solaris allocates memory by pages. | |
2512 int os::vm_allocation_granularity() { | |
2513 assert(os::Linux::page_size() != -1, "must call os::init"); | |
2514 return os::Linux::page_size(); | |
2515 } | |
2516 | |
2517 // Rationale behind this function: | |
2518 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2519 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2520 // samples for JITted code. Here we create private executable mapping over the code cache | |
2521 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2522 // info for the reporting script by storing timestamp and location of symbol | |
2523 void linux_wrap_code(char* base, size_t size) { | |
2524 static volatile jint cnt = 0; | |
2525 | |
2526 if (!UseOprofile) { | |
2527 return; | |
2528 } | |
2529 | |
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2530 char buf[PATH_MAX+1]; |
0 | 2531 int num = Atomic::add(1, &cnt); |
2532 | |
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2533 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
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changeset
|
2534 os::get_temp_directory(), os::current_process_id(), num); |
0 | 2535 unlink(buf); |
2536 | |
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|
2537 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
0 | 2538 |
2539 if (fd != -1) { | |
1980
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diff
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|
2540 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
0 | 2541 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
|
2542 if (::write(fd, "", 1) == 1) { |
0 | 2543 mmap(base, size, |
2544 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2545 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2546 } | |
2547 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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diff
changeset
|
2548 ::close(fd); |
0 | 2549 unlink(buf); |
2550 } | |
2551 } | |
2552 | |
2553 // NOTE: Linux kernel does not really reserve the pages for us. | |
2554 // All it does is to check if there are enough free pages | |
2555 // left at the time of mmap(). This could be a potential | |
2556 // problem. | |
6197 | 2557 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
656 | 2558 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2559 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
0 | 2560 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
3885 | 2561 if (res != (uintptr_t) MAP_FAILED) { |
2562 if (UseNUMAInterleaving) { | |
2563 numa_make_global(addr, size); | |
2564 } | |
2565 return true; | |
2566 } | |
2567 return false; | |
0 | 2568 } |
2569 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2570 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
139667d9836a
7034464: Support transparent large pages on Linux
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2302
diff
changeset
|
2571 #ifndef MAP_HUGETLB |
139667d9836a
7034464: Support transparent large pages on Linux
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2302
diff
changeset
|
2572 #define MAP_HUGETLB 0x40000 |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2573 #endif |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2574 |
139667d9836a
7034464: Support transparent large pages on Linux
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changeset
|
2575 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
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|
2576 #ifndef MADV_HUGEPAGE |
139667d9836a
7034464: Support transparent large pages on Linux
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2302
diff
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|
2577 #define MADV_HUGEPAGE 14 |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2578 #endif |
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7034464: Support transparent large pages on Linux
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diff
changeset
|
2579 |
6197 | 2580 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
656 | 2581 bool exec) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
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2302
diff
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|
2582 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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|
2583 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2584 uintptr_t res = |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2585 (uintptr_t) ::mmap(addr, size, prot, |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2586 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, |
139667d9836a
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|
2587 -1, 0); |
3885 | 2588 if (res != (uintptr_t) MAP_FAILED) { |
2589 if (UseNUMAInterleaving) { | |
2590 numa_make_global(addr, size); | |
2591 } | |
2592 return true; | |
2593 } | |
3913
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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parents:
3887
diff
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|
2594 // Fall through and try to use small pages |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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3887
diff
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|
2595 } |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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3887
diff
changeset
|
2596 |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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3887
diff
changeset
|
2597 if (commit_memory(addr, size, exec)) { |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
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|
2598 realign_memory(addr, size, alignment_hint); |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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3887
diff
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|
2599 return true; |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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3887
diff
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|
2600 } |
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
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diff
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|
2601 return false; |
0 | 2602 } |
2603 | |
6197 | 2604 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
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|
2605 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { |
139667d9836a
7034464: Support transparent large pages on Linux
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|
2606 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2607 // be supported or the memory may already be backed by huge pages. |
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2608 ::madvise(addr, bytes, MADV_HUGEPAGE); |
139667d9836a
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diff
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|
2609 } |
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diff
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|
2610 } |
141 | 2611 |
6197 | 2612 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
5937
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2613 // This method works by doing an mmap over an existing mmaping and effectively discarding |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2614 // the existing pages. However it won't work for SHM-based large pages that cannot be |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2615 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2616 // small pages on top of the SHM segment. This method always works for small pages, so we |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2617 // allow that in any case. |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
parents:
5909
diff
changeset
|
2618 if (alignment_hint <= (size_t)os::vm_page_size() || !UseSHM) { |
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
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parents:
5909
diff
changeset
|
2619 commit_memory(addr, bytes, alignment_hint, false); |
cf956638b844
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5909
diff
changeset
|
2620 } |
141 | 2621 } |
2622 | |
462
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diff
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|
2623 void os::numa_make_global(char *addr, size_t bytes) { |
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|
2624 Linux::numa_interleave_memory(addr, bytes); |
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|
2625 } |
141 | 2626 |
2627 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2628 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); | |
2629 } | |
2630 | |
2631 bool os::numa_topology_changed() { return false; } | |
2632 | |
2633 size_t os::numa_get_groups_num() { | |
2634 int max_node = Linux::numa_max_node(); | |
2635 return max_node > 0 ? max_node + 1 : 1; | |
2636 } | |
2637 | |
2638 int os::numa_get_group_id() { | |
2639 int cpu_id = Linux::sched_getcpu(); | |
2640 if (cpu_id != -1) { | |
2641 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
2642 if (lgrp_id != -1) { | |
2643 return lgrp_id; | |
2644 } | |
0 | 2645 } |
2646 return 0; | |
2647 } | |
2648 | |
141 | 2649 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
2650 for (size_t i = 0; i < size; i++) { | |
2651 ids[i] = i; | |
2652 } | |
2653 return size; | |
2654 } | |
2655 | |
0 | 2656 bool os::get_page_info(char *start, page_info* info) { |
2657 return false; | |
2658 } | |
2659 | |
2660 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2661 return end; | |
2662 } | |
2663 | |
3826 | 2664 |
2665 int os::Linux::sched_getcpu_syscall(void) { | |
2666 unsigned int cpu; | |
2667 int retval = -1; | |
2668 | |
2669 #if defined(IA32) | |
3887
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2670 # ifndef SYS_getcpu |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2671 # define SYS_getcpu 318 |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2672 # endif |
3826 | 2673 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
2674 #elif defined(AMD64) | |
3887
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2675 // Unfortunately we have to bring all these macros here from vsyscall.h |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2676 // to be able to compile on old linuxes. |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2677 # define __NR_vgetcpu 2 |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2678 # define VSYSCALL_START (-10UL << 20) |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2679 # define VSYSCALL_SIZE 1024 |
9447b2fb6fcf
7082645: Hotspot doesn't compile on old linuxes after 7060836
iveresov
parents:
3885
diff
changeset
|
2680 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
3826 | 2681 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
2682 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
2683 retval = vgetcpu(&cpu, NULL, NULL); | |
2684 #endif | |
2685 | |
2686 return (retval == -1) ? retval : cpu; | |
2687 } | |
2688 | |
2191 | 2689 // Something to do with the numa-aware allocator needs these symbols |
2690 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
2691 extern "C" JNIEXPORT void numa_error(char *where) { } | |
2692 extern "C" JNIEXPORT int fork1() { return fork(); } | |
141 | 2693 |
763
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|
2694 |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2695 // If we are running with libnuma version > 2, then we should |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2696 // be trying to use symbols with versions 1.1 |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2697 // If we are running with earlier version, which did not have symbol versions, |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
iveresov
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761
diff
changeset
|
2698 // we should use the base version. |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
iveresov
parents:
761
diff
changeset
|
2699 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
iveresov
parents:
761
diff
changeset
|
2700 void *f = dlvsym(handle, name, "libnuma_1.1"); |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
iveresov
parents:
761
diff
changeset
|
2701 if (f == NULL) { |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2702 f = dlsym(handle, name); |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2703 } |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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parents:
761
diff
changeset
|
2704 return f; |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
iveresov
parents:
761
diff
changeset
|
2705 } |
cf71f149d7ae
6840196: NUMA allocator: crash in fastdebug during startup on Linux
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761
diff
changeset
|
2706 |
462
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|
2707 bool os::Linux::libnuma_init() { |
141 | 2708 // sched_getcpu() should be in libc. |
2709 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
2710 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
2711 | |
3826 | 2712 // If it's not, try a direct syscall. |
2713 if (sched_getcpu() == -1) | |
2714 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
2715 | |
141 | 2716 if (sched_getcpu() != -1) { // Does it work? |
267
9d6a3a6891f8
6720130: NUMA allocator: The linux version should search for libnuma.so.1
iveresov
parents:
199
diff
changeset
|
2717 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
141 | 2718 if (handle != NULL) { |
2719 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
763
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761
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|
2720 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
141 | 2721 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
763
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761
diff
changeset
|
2722 libnuma_dlsym(handle, "numa_max_node"))); |
141 | 2723 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
763
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|
2724 libnuma_dlsym(handle, "numa_available"))); |
141 | 2725 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
763
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|
2726 libnuma_dlsym(handle, "numa_tonode_memory"))); |
462
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|
2727 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
763
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|
2728 libnuma_dlsym(handle, "numa_interleave_memory"))); |
462
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|
2729 |
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|
2730 |
141 | 2731 if (numa_available() != -1) { |
763
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|
2732 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
141 | 2733 // Create a cpu -> node mapping |
6197 | 2734 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
141 | 2735 rebuild_cpu_to_node_map(); |
462
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|
2736 return true; |
141 | 2737 } |
2738 } | |
2739 } | |
462
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|
2740 return false; |
141 | 2741 } |
2742 | |
2743 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
2744 // The table is later used in get_node_by_cpu(). | |
2745 void os::Linux::rebuild_cpu_to_node_map() { | |
462
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|
2746 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
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|
2747 // in libnuma (possible values are starting from 16, |
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|
2748 // and continuing up with every other power of 2, but less |
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|
2749 // than the maximum number of CPUs supported by kernel), and |
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|
2750 // is a subject to change (in libnuma version 2 the requirements |
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|
2751 // are more reasonable) we'll just hardcode the number they use |
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|
2752 // in the library. |
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|
2753 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
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2754 |
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2755 size_t cpu_num = os::active_processor_count(); |
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2756 size_t cpu_map_size = NCPUS / BitsPerCLong; |
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2757 size_t cpu_map_valid_size = |
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2758 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
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2759 |
141 | 2760 cpu_to_node()->clear(); |
2761 cpu_to_node()->at_grow(cpu_num - 1); | |
462
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2762 size_t node_num = numa_get_groups_num(); |
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2763 |
6197 | 2764 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
462
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2765 for (size_t i = 0; i < node_num; i++) { |
141 | 2766 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
462
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2767 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
141 | 2768 if (cpu_map[j] != 0) { |
462
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2769 for (size_t k = 0; k < BitsPerCLong; k++) { |
141 | 2770 if (cpu_map[j] & (1UL << k)) { |
462
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2771 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
141 | 2772 } |
2773 } | |
2774 } | |
2775 } | |
2776 } | |
2777 } | |
6197 | 2778 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
141 | 2779 } |
2780 | |
2781 int os::Linux::get_node_by_cpu(int cpu_id) { | |
2782 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
2783 return cpu_to_node()->at(cpu_id); | |
2784 } | |
2785 return -1; | |
2786 } | |
2787 | |
2788 GrowableArray<int>* os::Linux::_cpu_to_node; | |
2789 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
2790 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
2791 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
2792 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
2793 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
462
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2794 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
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2795 unsigned long* os::Linux::_numa_all_nodes; |
141 | 2796 |
6197 | 2797 bool os::pd_uncommit_memory(char* addr, size_t size) { |
1681
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2798 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
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2799 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
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2800 return res != (uintptr_t) MAP_FAILED; |
0 | 2801 } |
2802 | |
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2803 // Linux uses a growable mapping for the stack, and if the mapping for |
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2804 // the stack guard pages is not removed when we detach a thread the |
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2805 // stack cannot grow beyond the pages where the stack guard was |
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2806 // mapped. If at some point later in the process the stack expands to |
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2807 // that point, the Linux kernel cannot expand the stack any further |
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2808 // because the guard pages are in the way, and a segfault occurs. |
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2809 // |
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2810 // However, it's essential not to split the stack region by unmapping |
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2811 // a region (leaving a hole) that's already part of the stack mapping, |
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2812 // so if the stack mapping has already grown beyond the guard pages at |
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2813 // the time we create them, we have to truncate the stack mapping. |
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2814 // So, we need to know the extent of the stack mapping when |
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2815 // create_stack_guard_pages() is called. |
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2816 |
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2817 // Find the bounds of the stack mapping. Return true for success. |
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2818 // |
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2819 // We only need this for stacks that are growable: at the time of |
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2820 // writing thread stacks don't use growable mappings (i.e. those |
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2821 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
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2822 // only applies to the main thread. |
2469
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2823 |
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|
2824 static |
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|
2825 bool get_stack_bounds(uintptr_t *bottom, uintptr_t *top) { |
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|
2826 |
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|
2827 char buf[128]; |
677234770800
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|
2828 int fd, sz; |
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diff
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|
2829 |
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2830 if ((fd = ::open("/proc/self/maps", O_RDONLY)) < 0) { |
1320
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2831 return false; |
2469
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
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|
2832 } |
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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|
2833 |
677234770800
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|
2834 const char kw[] = "[stack]"; |
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2835 const int kwlen = sizeof(kw)-1; |
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|
2836 |
677234770800
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|
2837 // Address part of /proc/self/maps couldn't be more than 128 bytes |
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2838 while ((sz = os::get_line_chars(fd, buf, sizeof(buf))) > 0) { |
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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2839 if (sz > kwlen && ::memcmp(buf+sz-kwlen, kw, kwlen) == 0) { |
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
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|
2840 // Extract addresses |
677234770800
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|
2841 if (sscanf(buf, "%" SCNxPTR "-%" SCNxPTR, bottom, top) == 2) { |
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|
2842 uintptr_t sp = (uintptr_t) __builtin_frame_address(0); |
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|
2843 if (sp >= *bottom && sp <= *top) { |
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2302
diff
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|
2844 ::close(fd); |
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
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|
2845 return true; |
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7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
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diff
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|
2846 } |
1320
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2847 } |
2469
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|
2848 } |
1320
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|
2849 } |
2469
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|
2850 |
677234770800
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|
2851 ::close(fd); |
1320
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|
2852 return false; |
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|
2853 } |
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|
2854 |
2469
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|
2855 |
1320
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2856 // If the (growable) stack mapping already extends beyond the point |
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|
2857 // where we're going to put our guard pages, truncate the mapping at |
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|
2858 // that point by munmap()ping it. This ensures that when we later |
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2859 // munmap() the guard pages we don't leave a hole in the stack |
1750
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|
2860 // mapping. This only affects the main/initial thread, but guard |
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2861 // against future OS changes |
6197 | 2862 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
1320
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2863 uintptr_t stack_extent, stack_base; |
1750
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2864 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
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2865 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
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|
2866 assert(os::Linux::is_initial_thread(), |
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|
2867 "growable stack in non-initial thread"); |
1320
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2868 if (stack_extent < (uintptr_t)addr) |
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2869 ::munmap((void*)stack_extent, (uintptr_t)addr - stack_extent); |
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|
2870 } |
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|
2871 |
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|
2872 return os::commit_memory(addr, size); |
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|
2873 } |
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|
2874 |
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|
2875 // If this is a growable mapping, remove the guard pages entirely by |
1750
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|
2876 // munmap()ping them. If not, just call uncommit_memory(). This only |
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|
2877 // affects the main/initial thread, but guard against future OS changes |
1320
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|
2878 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
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|
2879 uintptr_t stack_extent, stack_base; |
1750
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|
2880 bool chk_bounds = NOT_DEBUG(os::Linux::is_initial_thread()) DEBUG_ONLY(true); |
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|
2881 if (chk_bounds && get_stack_bounds(&stack_extent, &stack_base)) { |
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|
2882 assert(os::Linux::is_initial_thread(), |
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|
2883 "growable stack in non-initial thread"); |
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|
2884 |
1320
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|
2885 return ::munmap(addr, size) == 0; |
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|
2886 } |
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|
2887 |
3b3d12e645e7
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|
2888 return os::uncommit_memory(addr, size); |
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|
2889 } |
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|
2890 |
0 | 2891 static address _highest_vm_reserved_address = NULL; |
2892 | |
2893 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2894 // at 'requested_addr'. If there are existing memory mappings at the same | |
2895 // location, however, they will be overwritten. If 'fixed' is false, | |
2896 // 'requested_addr' is only treated as a hint, the return value may or | |
2897 // may not start from the requested address. Unlike Linux mmap(), this | |
2898 // function returns NULL to indicate failure. | |
2899 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2900 char * addr; | |
2901 int flags; | |
2902 | |
2903 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2904 if (fixed) { | |
2905 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
2906 flags |= MAP_FIXED; | |
2907 } | |
2908 | |
656 | 2909 // Map uncommitted pages PROT_READ and PROT_WRITE, change access |
2910 // to PROT_EXEC if executable when we commit the page. | |
2911 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
0 | 2912 flags, -1, 0); |
2913 | |
2914 if (addr != MAP_FAILED) { | |
2915 // anon_mmap() should only get called during VM initialization, | |
2916 // don't need lock (actually we can skip locking even it can be called | |
2917 // from multiple threads, because _highest_vm_reserved_address is just a | |
2918 // hint about the upper limit of non-stack memory regions.) | |
2919 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2920 _highest_vm_reserved_address = (address)addr + bytes; | |
2921 } | |
2922 } | |
2923 | |
2924 return addr == MAP_FAILED ? NULL : addr; | |
2925 } | |
2926 | |
2927 // Don't update _highest_vm_reserved_address, because there might be memory | |
2928 // regions above addr + size. If so, releasing a memory region only creates | |
2929 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2930 // | |
2931 static int anon_munmap(char * addr, size_t size) { | |
2932 return ::munmap(addr, size) == 0; | |
2933 } | |
2934 | |
6197 | 2935 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
0 | 2936 size_t alignment_hint) { |
2937 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2938 } | |
2939 | |
6197 | 2940 bool os::pd_release_memory(char* addr, size_t size) { |
0 | 2941 return anon_munmap(addr, size); |
2942 } | |
2943 | |
2944 static address highest_vm_reserved_address() { | |
2945 return _highest_vm_reserved_address; | |
2946 } | |
2947 | |
2948 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
2949 // Linux wants the mprotect address argument to be page aligned. | |
2950 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
2951 | |
2952 // According to SUSv3, mprotect() should only be used with mappings | |
2953 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2954 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2955 // protection of malloc'ed or statically allocated memory). Check the | |
2956 // caller if you hit this assert. | |
2957 assert(addr == bottom, "sanity check"); | |
2958 | |
2959 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
2960 return ::mprotect(bottom, size, prot) == 0; | |
2961 } | |
2962 | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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235
diff
changeset
|
2963 // Set protections specified |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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235
diff
changeset
|
2964 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
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235
diff
changeset
|
2965 bool is_committed) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2966 unsigned int p = 0; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2967 switch (prot) { |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2968 case MEM_PROT_NONE: p = PROT_NONE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2969 case MEM_PROT_READ: p = PROT_READ; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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parents:
235
diff
changeset
|
2970 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2971 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
|
2972 default: |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2973 ShouldNotReachHere(); |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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parents:
235
diff
changeset
|
2974 } |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
2975 // is_committed is unused. |
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
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parents:
235
diff
changeset
|
2976 return linux_mprotect(addr, bytes, p); |
0 | 2977 } |
2978 | |
2979 bool os::guard_memory(char* addr, size_t size) { | |
2980 return linux_mprotect(addr, size, PROT_NONE); | |
2981 } | |
2982 | |
2983 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
|
2984 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
0 | 2985 } |
2986 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
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diff
changeset
|
2987 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
|
2988 bool result = false; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2989 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2990 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2991 -1, 0); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2992 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2993 if (p != (void *) -1) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2994 // 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
|
2995 FILE *fp = fopen("/proc/self/maps", "r"); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2996 if (fp) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2997 while (!feof(fp)) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2998 char chars[257]; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
2999 long x = 0; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3000 if (fgets(chars, sizeof(chars), fp)) { |
3358 | 3001 if (sscanf(chars, "%lx-%*x", &x) == 1 |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3002 && x == (long)p) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3003 if (strstr (chars, "hugepage")) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3004 result = true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3005 break; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3006 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3007 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3008 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3009 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3010 fclose(fp); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3011 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3012 munmap (p, page_size); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3013 if (result) |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3014 return true; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3015 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3016 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3017 if (warn) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3018 warning("HugeTLBFS is not supported by the operating system."); |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3019 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3020 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3021 return result; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3022 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3023 |
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3024 /* |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3025 * 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
|
3026 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3027 * From the coredump_filter documentation: |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3028 * |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3029 * - (bit 0) anonymous private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3030 * - (bit 1) anonymous shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3031 * - (bit 2) file-backed private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3032 * - (bit 3) file-backed shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3033 * - (bit 4) ELF header pages in file-backed private memory areas (it is |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3034 * effective only if the bit 2 is cleared) |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3035 * - (bit 5) hugetlb private memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3036 * - (bit 6) hugetlb shared memory |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3037 */ |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3038 static void set_coredump_filter(void) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3039 FILE *f; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3040 long cdm; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3041 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3042 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3043 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3044 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3045 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3046 if (fscanf(f, "%lx", &cdm) != 1) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3047 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3048 return; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3049 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3050 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3051 rewind(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3052 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3053 if ((cdm & LARGEPAGES_BIT) == 0) { |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3054 cdm |= LARGEPAGES_BIT; |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3055 fprintf(f, "%#lx", cdm); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3056 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3057 |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3058 fclose(f); |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3059 } |
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3060 |
0 | 3061 // Large page support |
3062 | |
3063 static size_t _large_page_size = 0; | |
3064 | |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3065 void os::large_page_init() { |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3066 if (!UseLargePages) { |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3067 UseHugeTLBFS = false; |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3068 UseSHM = false; |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3069 return; |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3070 } |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3071 |
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3072 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3073 // If UseLargePages is specified on the command line try both methods, |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3074 // if it's default, then try only HugeTLBFS. |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3075 if (FLAG_IS_DEFAULT(UseLargePages)) { |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3076 UseHugeTLBFS = true; |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3077 } else { |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3078 UseHugeTLBFS = UseSHM = true; |
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
3079 } |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3080 } |
0 | 3081 |
3082 if (LargePageSizeInBytes) { | |
3083 _large_page_size = LargePageSizeInBytes; | |
3084 } else { | |
3085 // large_page_size on Linux is used to round up heap size. x86 uses either | |
3086 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
3087 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
3088 // page as large as 256M. | |
3089 // | |
3090 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
3091 // for a line with the following format: | |
3092 // Hugepagesize: 2048 kB | |
3093 // | |
3094 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
3095 // format has been changed), we'll use the largest page size supported by | |
3096 // the processor. | |
3097 | |
1010 | 3098 #ifndef ZERO |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
3099 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
3100 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
1010 | 3101 #endif // ZERO |
0 | 3102 |
3103 FILE *fp = fopen("/proc/meminfo", "r"); | |
3104 if (fp) { | |
3105 while (!feof(fp)) { | |
3106 int x = 0; | |
3107 char buf[16]; | |
3108 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
3109 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
3110 _large_page_size = x * K; | |
3111 break; | |
3112 } | |
3113 } else { | |
3114 // skip to next line | |
3115 for (;;) { | |
3116 int ch = fgetc(fp); | |
3117 if (ch == EOF || ch == (int)'\n') break; | |
3118 } | |
3119 } | |
3120 } | |
3121 fclose(fp); | |
3122 } | |
3123 } | |
3124 | |
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3125 // print a warning if any large page related flag is specified on command line |
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3126 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
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3127 |
0 | 3128 const size_t default_page_size = (size_t)Linux::page_size(); |
3129 if (_large_page_size > default_page_size) { | |
3130 _page_sizes[0] = _large_page_size; | |
3131 _page_sizes[1] = default_page_size; | |
3132 _page_sizes[2] = 0; | |
3133 } | |
3286
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3134 UseHugeTLBFS = UseHugeTLBFS && |
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3135 Linux::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); |
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3136 |
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3137 if (UseHugeTLBFS) |
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3138 UseSHM = false; |
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3139 |
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3140 UseLargePages = UseHugeTLBFS || UseSHM; |
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3141 |
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3142 set_coredump_filter(); |
0 | 3143 } |
3144 | |
3145 #ifndef SHM_HUGETLB | |
3146 #define SHM_HUGETLB 04000 | |
3147 #endif | |
3148 | |
656 | 3149 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { |
3150 // "exec" is passed in but not used. Creating the shared image for | |
3151 // the code cache doesn't have an SHM_X executable permission to check. | |
3286
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3152 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
0 | 3153 |
3154 key_t key = IPC_PRIVATE; | |
3155 char *addr; | |
3156 | |
3157 bool warn_on_failure = UseLargePages && | |
3158 (!FLAG_IS_DEFAULT(UseLargePages) || | |
3159 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
3160 ); | |
3161 char msg[128]; | |
3162 | |
3163 // Create a large shared memory region to attach to based on size. | |
3164 // Currently, size is the total size of the heap | |
3165 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
3166 if (shmid == -1) { | |
3167 // Possible reasons for shmget failure: | |
3168 // 1. shmmax is too small for Java heap. | |
3169 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
3170 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
3171 // 2. not enough large page memory. | |
3172 // > check available large pages: cat /proc/meminfo | |
3173 // > increase amount of large pages: | |
3174 // echo new_value > /proc/sys/vm/nr_hugepages | |
3175 // Note 1: different Linux may use different name for this property, | |
3176 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
3177 // Note 2: it's possible there's enough physical memory available but | |
3178 // they are so fragmented after a long run that they can't | |
3179 // coalesce into large pages. Try to reserve large pages when | |
3180 // the system is still "fresh". | |
3181 if (warn_on_failure) { | |
3182 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
3183 warning(msg); | |
3184 } | |
3185 return NULL; | |
3186 } | |
3187 | |
3188 // attach to the region | |
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3189 addr = (char*)shmat(shmid, req_addr, 0); |
0 | 3190 int err = errno; |
3191 | |
3192 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
3193 // will be deleted when it's detached by shmdt() or when the process | |
3194 // terminates. If shmat() is not successful this will remove the shared | |
3195 // segment immediately. | |
3196 shmctl(shmid, IPC_RMID, NULL); | |
3197 | |
3198 if ((intptr_t)addr == -1) { | |
3199 if (warn_on_failure) { | |
3200 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
3201 warning(msg); | |
3202 } | |
3203 return NULL; | |
3204 } | |
3205 | |
3885 | 3206 if ((addr != NULL) && UseNUMAInterleaving) { |
3207 numa_make_global(addr, bytes); | |
3208 } | |
3209 | |
8711
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3210 // The memory is committed |
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3211 address pc = CALLER_PC; |
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3212 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); |
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3213 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); |
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3214 |
0 | 3215 return addr; |
3216 } | |
3217 | |
3218 bool os::release_memory_special(char* base, size_t bytes) { | |
3219 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
3220 int rslt = shmdt(base); | |
8711
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3221 if (rslt == 0) { |
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3222 MemTracker::record_virtual_memory_uncommit((address)base, bytes); |
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3223 MemTracker::record_virtual_memory_release((address)base, bytes); |
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3224 return true; |
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3225 } else { |
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3226 return false; |
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3227 } |
0 | 3228 } |
3229 | |
3230 size_t os::large_page_size() { | |
3231 return _large_page_size; | |
3232 } | |
3233 | |
3286
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3234 // HugeTLBFS allows application to commit large page memory on demand; |
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3235 // with SysV SHM the entire memory region must be allocated as shared |
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3236 // memory. |
0 | 3237 bool os::can_commit_large_page_memory() { |
3286
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3238 return UseHugeTLBFS; |
0 | 3239 } |
3240 | |
79
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3241 bool os::can_execute_large_page_memory() { |
3286
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3242 return UseHugeTLBFS; |
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3243 } |
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3244 |
0 | 3245 // Reserve memory at an arbitrary address, only if that area is |
3246 // available (and not reserved for something else). | |
3247 | |
6197 | 3248 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
0 | 3249 const int max_tries = 10; |
3250 char* base[max_tries]; | |
3251 size_t size[max_tries]; | |
3252 const size_t gap = 0x000000; | |
3253 | |
3254 // Assert only that the size is a multiple of the page size, since | |
3255 // that's all that mmap requires, and since that's all we really know | |
3256 // about at this low abstraction level. If we need higher alignment, | |
3257 // we can either pass an alignment to this method or verify alignment | |
3258 // in one of the methods further up the call chain. See bug 5044738. | |
3259 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
3260 | |
3261 // Repeatedly allocate blocks until the block is allocated at the | |
3262 // right spot. Give up after max_tries. Note that reserve_memory() will | |
3263 // automatically update _highest_vm_reserved_address if the call is | |
3264 // successful. The variable tracks the highest memory address every reserved | |
3265 // by JVM. It is used to detect heap-stack collision if running with | |
3266 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
3267 // space than needed, it could confuse the collision detecting code. To | |
3268 // solve the problem, save current _highest_vm_reserved_address and | |
3269 // calculate the correct value before return. | |
3270 address old_highest = _highest_vm_reserved_address; | |
3271 | |
3272 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
3273 // if kernel honors the hint then we can return immediately. | |
3274 char * addr = anon_mmap(requested_addr, bytes, false); | |
3275 if (addr == requested_addr) { | |
3276 return requested_addr; | |
3277 } | |
3278 | |
3279 if (addr != NULL) { | |
3280 // mmap() is successful but it fails to reserve at the requested address | |
3281 anon_munmap(addr, bytes); | |
3282 } | |
3283 | |
3284 int i; | |
3285 for (i = 0; i < max_tries; ++i) { | |
3286 base[i] = reserve_memory(bytes); | |
3287 | |
3288 if (base[i] != NULL) { | |
3289 // Is this the block we wanted? | |
3290 if (base[i] == requested_addr) { | |
3291 size[i] = bytes; | |
3292 break; | |
3293 } | |
3294 | |
3295 // Does this overlap the block we wanted? Give back the overlapped | |
3296 // parts and try again. | |
3297 | |
3298 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
3299 if (top_overlap >= 0 && top_overlap < bytes) { | |
3300 unmap_memory(base[i], top_overlap); | |
3301 base[i] += top_overlap; | |
3302 size[i] = bytes - top_overlap; | |
3303 } else { | |
3304 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
3305 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
3306 unmap_memory(requested_addr, bottom_overlap); | |
3307 size[i] = bytes - bottom_overlap; | |
3308 } else { | |
3309 size[i] = bytes; | |
3310 } | |
3311 } | |
3312 } | |
3313 } | |
3314 | |
3315 // Give back the unused reserved pieces. | |
3316 | |
3317 for (int j = 0; j < i; ++j) { | |
3318 if (base[j] != NULL) { | |
3319 unmap_memory(base[j], size[j]); | |
3320 } | |
3321 } | |
3322 | |
3323 if (i < max_tries) { | |
3324 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
3325 return requested_addr; | |
3326 } else { | |
3327 _highest_vm_reserved_address = old_highest; | |
3328 return NULL; | |
3329 } | |
3330 } | |
3331 | |
3332 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
3333 return ::read(fd, buf, nBytes); | |
3334 } | |
3335 | |
3336 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
3337 // Solaris uses poll(), linux uses park(). | |
3338 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
3339 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
3340 // SIGSEGV, see 4355769. | |
3341 | |
3342 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
3343 assert(thread == Thread::current(), "thread consistency check"); | |
3344 | |
3345 ParkEvent * const slp = thread->_SleepEvent ; | |
3346 slp->reset() ; | |
3347 OrderAccess::fence() ; | |
3348 | |
3349 if (interruptible) { | |
3350 jlong prevtime = javaTimeNanos(); | |
3351 | |
3352 for (;;) { | |
3353 if (os::is_interrupted(thread, true)) { | |
3354 return OS_INTRPT; | |
3355 } | |
3356 | |
3357 jlong newtime = javaTimeNanos(); | |
3358 | |
3359 if (newtime - prevtime < 0) { | |
3360 // time moving backwards, should only happen if no monotonic clock | |
3361 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3362 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3363 } else { | |
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3364 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3365 } |
3366 | |
3367 if(millis <= 0) { | |
3368 return OS_OK; | |
3369 } | |
3370 | |
3371 prevtime = newtime; | |
3372 | |
3373 { | |
3374 assert(thread->is_Java_thread(), "sanity check"); | |
3375 JavaThread *jt = (JavaThread *) thread; | |
3376 ThreadBlockInVM tbivm(jt); | |
3377 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
3378 | |
3379 jt->set_suspend_equivalent(); | |
3380 // cleared by handle_special_suspend_equivalent_condition() or | |
3381 // java_suspend_self() via check_and_wait_while_suspended() | |
3382 | |
3383 slp->park(millis); | |
3384 | |
3385 // were we externally suspended while we were waiting? | |
3386 jt->check_and_wait_while_suspended(); | |
3387 } | |
3388 } | |
3389 } else { | |
3390 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
3391 jlong prevtime = javaTimeNanos(); | |
3392 | |
3393 for (;;) { | |
3394 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
3395 // the 1st iteration ... | |
3396 jlong newtime = javaTimeNanos(); | |
3397 | |
3398 if (newtime - prevtime < 0) { | |
3399 // time moving backwards, should only happen if no monotonic clock | |
3400 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
3401 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
3402 } else { | |
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3403 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
0 | 3404 } |
3405 | |
3406 if(millis <= 0) break ; | |
3407 | |
3408 prevtime = newtime; | |
3409 slp->park(millis); | |
3410 } | |
3411 return OS_OK ; | |
3412 } | |
3413 } | |
3414 | |
3415 int os::naked_sleep() { | |
3416 // %% make the sleep time an integer flag. for now use 1 millisec. | |
3417 return os::sleep(Thread::current(), 1, false); | |
3418 } | |
3419 | |
3420 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
3421 void os::infinite_sleep() { | |
3422 while (true) { // sleep forever ... | |
3423 ::sleep(100); // ... 100 seconds at a time | |
3424 } | |
3425 } | |
3426 | |
3427 // Used to convert frequent JVM_Yield() to nops | |
3428 bool os::dont_yield() { | |
3429 return DontYieldALot; | |
3430 } | |
3431 | |
3432 void os::yield() { | |
3433 sched_yield(); | |
3434 } | |
3435 | |
3436 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
3437 | |
3438 void os::yield_all(int attempts) { | |
3439 // Yields to all threads, including threads with lower priorities | |
3440 // Threads on Linux are all with same priority. The Solaris style | |
3441 // os::yield_all() with nanosleep(1ms) is not necessary. | |
3442 sched_yield(); | |
3443 } | |
3444 | |
3445 // Called from the tight loops to possibly influence time-sharing heuristics | |
3446 void os::loop_breaker(int attempts) { | |
3447 os::yield_all(attempts); | |
3448 } | |
3449 | |
3450 //////////////////////////////////////////////////////////////////////////////// | |
3451 // thread priority support | |
3452 | |
3453 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
3454 // only supports dynamic priority, static priority must be zero. For real-time | |
3455 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
3456 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
3457 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
3458 // of 5 runs - Sep 2005). | |
3459 // | |
3460 // The following code actually changes the niceness of kernel-thread/LWP. It | |
3461 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
3462 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
3463 // threads. It has always been the case, but could change in the future. For | |
3464 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
3465 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
3466 | |
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3467 int os::java_to_os_priority[CriticalPriority + 1] = { |
0 | 3468 19, // 0 Entry should never be used |
3469 | |
3470 4, // 1 MinPriority | |
3471 3, // 2 | |
3472 2, // 3 | |
3473 | |
3474 1, // 4 | |
3475 0, // 5 NormPriority | |
3476 -1, // 6 | |
3477 | |
3478 -2, // 7 | |
3479 -3, // 8 | |
3480 -4, // 9 NearMaxPriority | |
3481 | |
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3482 -5, // 10 MaxPriority |
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3483 |
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3484 -5 // 11 CriticalPriority |
0 | 3485 }; |
3486 | |
3487 static int prio_init() { | |
3488 if (ThreadPriorityPolicy == 1) { | |
3489 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
3490 // if effective uid is not root. Perhaps, a more elegant way of doing | |
3491 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
3492 if (geteuid() != 0) { | |
3493 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
3494 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
3495 } | |
3496 ThreadPriorityPolicy = 0; | |
3497 } | |
3498 } | |
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3499 if (UseCriticalJavaThreadPriority) { |
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3500 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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3501 } |
0 | 3502 return 0; |
3503 } | |
3504 | |
3505 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
3506 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
3507 | |
3508 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
3509 return (ret == 0) ? OS_OK : OS_ERR; | |
3510 } | |
3511 | |
3512 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
3513 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
3514 *priority_ptr = java_to_os_priority[NormPriority]; | |
3515 return OS_OK; | |
3516 } | |
3517 | |
3518 errno = 0; | |
3519 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
3520 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
3521 } | |
3522 | |
3523 // Hint to the underlying OS that a task switch would not be good. | |
3524 // Void return because it's a hint and can fail. | |
3525 void os::hint_no_preempt() {} | |
3526 | |
3527 //////////////////////////////////////////////////////////////////////////////// | |
3528 // suspend/resume support | |
3529 | |
3530 // the low-level signal-based suspend/resume support is a remnant from the | |
3531 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
3532 // within hotspot. Now there is a single use-case for this: | |
3533 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
3534 // that runs in the watcher thread. | |
3535 // The remaining code is greatly simplified from the more general suspension | |
3536 // code that used to be used. | |
3537 // | |
3538 // The protocol is quite simple: | |
3539 // - suspend: | |
3540 // - sends a signal to the target thread | |
3541 // - polls the suspend state of the osthread using a yield loop | |
3542 // - target thread signal handler (SR_handler) sets suspend state | |
3543 // and blocks in sigsuspend until continued | |
3544 // - resume: | |
3545 // - sets target osthread state to continue | |
3546 // - sends signal to end the sigsuspend loop in the SR_handler | |
3547 // | |
3548 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3549 // | |
3550 | |
3551 static void resume_clear_context(OSThread *osthread) { | |
3552 osthread->set_ucontext(NULL); | |
3553 osthread->set_siginfo(NULL); | |
3554 | |
3555 // notify the suspend action is completed, we have now resumed | |
3556 osthread->sr.clear_suspended(); | |
3557 } | |
3558 | |
3559 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
3560 osthread->set_ucontext(context); | |
3561 osthread->set_siginfo(siginfo); | |
3562 } | |
3563 | |
3564 // | |
3565 // Handler function invoked when a thread's execution is suspended or | |
3566 // resumed. We have to be careful that only async-safe functions are | |
3567 // called here (Note: most pthread functions are not async safe and | |
3568 // should be avoided.) | |
3569 // | |
3570 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
3571 // interface point of view, but sigwait() prevents the signal hander | |
3572 // from being run. libpthread would get very confused by not having | |
3573 // its signal handlers run and prevents sigwait()'s use with the | |
3574 // mutex granting granting signal. | |
3575 // | |
3576 // Currently only ever called on the VMThread | |
3577 // | |
3578 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
3579 // Save and restore errno to avoid confusing native code with EINTR | |
3580 // after sigsuspend. | |
3581 int old_errno = errno; | |
3582 | |
3583 Thread* thread = Thread::current(); | |
3584 OSThread* osthread = thread->osthread(); | |
3585 assert(thread->is_VM_thread(), "Must be VMThread"); | |
3586 // read current suspend action | |
3587 int action = osthread->sr.suspend_action(); | |
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3588 if (action == os::Linux::SuspendResume::SR_SUSPEND) { |
0 | 3589 suspend_save_context(osthread, siginfo, context); |
3590 | |
3591 // Notify the suspend action is about to be completed. do_suspend() | |
3592 // waits until SR_SUSPENDED is set and then returns. We will wait | |
3593 // here for a resume signal and that completes the suspend-other | |
3594 // action. do_suspend/do_resume is always called as a pair from | |
3595 // the same thread - so there are no races | |
3596 | |
3597 // notify the caller | |
3598 osthread->sr.set_suspended(); | |
3599 | |
3600 sigset_t suspend_set; // signals for sigsuspend() | |
3601 | |
3602 // get current set of blocked signals and unblock resume signal | |
3603 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
3604 sigdelset(&suspend_set, SR_signum); | |
3605 | |
3606 // wait here until we are resumed | |
3607 do { | |
3608 sigsuspend(&suspend_set); | |
3609 // ignore all returns until we get a resume signal | |
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3610 } while (osthread->sr.suspend_action() != os::Linux::SuspendResume::SR_CONTINUE); |
0 | 3611 |
3612 resume_clear_context(osthread); | |
3613 | |
3614 } else { | |
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3615 assert(action == os::Linux::SuspendResume::SR_CONTINUE, "unexpected sr action"); |
0 | 3616 // nothing special to do - just leave the handler |
3617 } | |
3618 | |
3619 errno = old_errno; | |
3620 } | |
3621 | |
3622 | |
3623 static int SR_initialize() { | |
3624 struct sigaction act; | |
3625 char *s; | |
3626 /* Get signal number to use for suspend/resume */ | |
3627 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
3628 int sig = ::strtol(s, 0, 10); | |
3629 if (sig > 0 || sig < _NSIG) { | |
3630 SR_signum = sig; | |
3631 } | |
3632 } | |
3633 | |
3634 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
3635 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
3636 | |
3637 sigemptyset(&SR_sigset); | |
3638 sigaddset(&SR_sigset, SR_signum); | |
3639 | |
3640 /* Set up signal handler for suspend/resume */ | |
3641 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
3642 act.sa_handler = (void (*)(int)) SR_handler; | |
3643 | |
3644 // SR_signum is blocked by default. | |
3645 // 4528190 - We also need to block pthread restart signal (32 on all | |
3646 // supported Linux platforms). Note that LinuxThreads need to block | |
3647 // this signal for all threads to work properly. So we don't have | |
3648 // to use hard-coded signal number when setting up the mask. | |
3649 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
3650 | |
3651 if (sigaction(SR_signum, &act, 0) == -1) { | |
3652 return -1; | |
3653 } | |
3654 | |
3655 // Save signal flag | |
3656 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
3657 return 0; | |
3658 } | |
3659 | |
3660 | |
3661 // returns true on success and false on error - really an error is fatal | |
3662 // but this seems the normal response to library errors | |
3663 static bool do_suspend(OSThread* osthread) { | |
3664 // mark as suspended and send signal | |
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3665 osthread->sr.set_suspend_action(os::Linux::SuspendResume::SR_SUSPEND); |
0 | 3666 int status = pthread_kill(osthread->pthread_id(), SR_signum); |
3667 assert_status(status == 0, status, "pthread_kill"); | |
3668 | |
3669 // check status and wait until notified of suspension | |
3670 if (status == 0) { | |
3671 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
3672 os::yield_all(i); | |
3673 } | |
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3674 osthread->sr.set_suspend_action(os::Linux::SuspendResume::SR_NONE); |
0 | 3675 return true; |
3676 } | |
3677 else { | |
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3678 osthread->sr.set_suspend_action(os::Linux::SuspendResume::SR_NONE); |
0 | 3679 return false; |
3680 } | |
3681 } | |
3682 | |
3683 static void do_resume(OSThread* osthread) { | |
3684 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
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3685 osthread->sr.set_suspend_action(os::Linux::SuspendResume::SR_CONTINUE); |
0 | 3686 |
3687 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3688 assert_status(status == 0, status, "pthread_kill"); | |
3689 // check status and wait unit notified of resumption | |
3690 if (status == 0) { | |
3691 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
3692 os::yield_all(i); | |
3693 } | |
3694 } | |
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3695 osthread->sr.set_suspend_action(os::Linux::SuspendResume::SR_NONE); |
0 | 3696 } |
3697 | |
3698 //////////////////////////////////////////////////////////////////////////////// | |
3699 // interrupt support | |
3700 | |
3701 void os::interrupt(Thread* thread) { | |
3702 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3703 "possibility of dangling Thread pointer"); | |
3704 | |
3705 OSThread* osthread = thread->osthread(); | |
3706 | |
3707 if (!osthread->interrupted()) { | |
3708 osthread->set_interrupted(true); | |
3709 // More than one thread can get here with the same value of osthread, | |
3710 // resulting in multiple notifications. We do, however, want the store | |
3711 // to interrupted() to be visible to other threads before we execute unpark(). | |
3712 OrderAccess::fence(); | |
3713 ParkEvent * const slp = thread->_SleepEvent ; | |
3714 if (slp != NULL) slp->unpark() ; | |
3715 } | |
3716 | |
3717 // For JSR166. Unpark even if interrupt status already was set | |
3718 if (thread->is_Java_thread()) | |
3719 ((JavaThread*)thread)->parker()->unpark(); | |
3720 | |
3721 ParkEvent * ev = thread->_ParkEvent ; | |
3722 if (ev != NULL) ev->unpark() ; | |
3723 | |
3724 } | |
3725 | |
3726 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3727 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3728 "possibility of dangling Thread pointer"); | |
3729 | |
3730 OSThread* osthread = thread->osthread(); | |
3731 | |
3732 bool interrupted = osthread->interrupted(); | |
3733 | |
3734 if (interrupted && clear_interrupted) { | |
3735 osthread->set_interrupted(false); | |
3736 // consider thread->_SleepEvent->reset() ... optional optimization | |
3737 } | |
3738 | |
3739 return interrupted; | |
3740 } | |
3741 | |
3742 /////////////////////////////////////////////////////////////////////////////////// | |
3743 // signal handling (except suspend/resume) | |
3744 | |
3745 // This routine may be used by user applications as a "hook" to catch signals. | |
3746 // The user-defined signal handler must pass unrecognized signals to this | |
3747 // routine, and if it returns true (non-zero), then the signal handler must | |
3748 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3749 // routine will never retun false (zero), but instead will execute a VM panic | |
3750 // routine kill the process. | |
3751 // | |
3752 // If this routine returns false, it is OK to call it again. This allows | |
3753 // the user-defined signal handler to perform checks either before or after | |
3754 // the VM performs its own checks. Naturally, the user code would be making | |
3755 // a serious error if it tried to handle an exception (such as a null check | |
3756 // or breakpoint) that the VM was generating for its own correct operation. | |
3757 // | |
3758 // This routine may recognize any of the following kinds of signals: | |
3759 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3760 // It should be consulted by handlers for any of those signals. | |
3761 // | |
3762 // The caller of this routine must pass in the three arguments supplied | |
3763 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3764 // field of the structure passed to sigaction(). This routine assumes that | |
3765 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3766 // | |
3767 // Note that the VM will print warnings if it detects conflicting signal | |
3768 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3769 // | |
2191 | 3770 extern "C" JNIEXPORT int |
0 | 3771 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
3772 void* ucontext, int abort_if_unrecognized); | |
3773 | |
3774 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3775 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3776 int orig_errno = errno; // Preserve errno value over signal handler. |
0 | 3777 JVM_handle_linux_signal(sig, info, uc, true); |
8067 | 3778 errno = orig_errno; |
0 | 3779 } |
3780 | |
3781 | |
3782 // This boolean allows users to forward their own non-matching signals | |
3783 // to JVM_handle_linux_signal, harmlessly. | |
3784 bool os::Linux::signal_handlers_are_installed = false; | |
3785 | |
3786 // For signal-chaining | |
3787 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
3788 unsigned int os::Linux::sigs = 0; | |
3789 bool os::Linux::libjsig_is_loaded = false; | |
3790 typedef struct sigaction *(*get_signal_t)(int); | |
3791 get_signal_t os::Linux::get_signal_action = NULL; | |
3792 | |
3793 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
3794 struct sigaction *actp = NULL; | |
3795 | |
3796 if (libjsig_is_loaded) { | |
3797 // Retrieve the old signal handler from libjsig | |
3798 actp = (*get_signal_action)(sig); | |
3799 } | |
3800 if (actp == NULL) { | |
3801 // Retrieve the preinstalled signal handler from jvm | |
3802 actp = get_preinstalled_handler(sig); | |
3803 } | |
3804 | |
3805 return actp; | |
3806 } | |
3807 | |
3808 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3809 siginfo_t *siginfo, void *context) { | |
3810 // Call the old signal handler | |
3811 if (actp->sa_handler == SIG_DFL) { | |
3812 // It's more reasonable to let jvm treat it as an unexpected exception | |
3813 // instead of taking the default action. | |
3814 return false; | |
3815 } else if (actp->sa_handler != SIG_IGN) { | |
3816 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3817 // automaticlly block the signal | |
3818 sigaddset(&(actp->sa_mask), sig); | |
3819 } | |
3820 | |
3821 sa_handler_t hand; | |
3822 sa_sigaction_t sa; | |
3823 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3824 // retrieve the chained handler | |
3825 if (siginfo_flag_set) { | |
3826 sa = actp->sa_sigaction; | |
3827 } else { | |
3828 hand = actp->sa_handler; | |
3829 } | |
3830 | |
3831 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3832 actp->sa_handler = SIG_DFL; | |
3833 } | |
3834 | |
3835 // try to honor the signal mask | |
3836 sigset_t oset; | |
3837 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3838 | |
3839 // call into the chained handler | |
3840 if (siginfo_flag_set) { | |
3841 (*sa)(sig, siginfo, context); | |
3842 } else { | |
3843 (*hand)(sig); | |
3844 } | |
3845 | |
3846 // restore the signal mask | |
3847 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3848 } | |
3849 // Tell jvm's signal handler the signal is taken care of. | |
3850 return true; | |
3851 } | |
3852 | |
3853 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3854 bool chained = false; | |
3855 // signal-chaining | |
3856 if (UseSignalChaining) { | |
3857 struct sigaction *actp = get_chained_signal_action(sig); | |
3858 if (actp != NULL) { | |
3859 chained = call_chained_handler(actp, sig, siginfo, context); | |
3860 } | |
3861 } | |
3862 return chained; | |
3863 } | |
3864 | |
3865 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
3866 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3867 return &sigact[sig]; | |
3868 } | |
3869 return NULL; | |
3870 } | |
3871 | |
3872 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3873 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3874 sigact[sig] = oldAct; | |
3875 sigs |= (unsigned int)1 << sig; | |
3876 } | |
3877 | |
3878 // for diagnostic | |
3879 int os::Linux::sigflags[MAXSIGNUM]; | |
3880 | |
3881 int os::Linux::get_our_sigflags(int sig) { | |
3882 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3883 return sigflags[sig]; | |
3884 } | |
3885 | |
3886 void os::Linux::set_our_sigflags(int sig, int flags) { | |
3887 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3888 sigflags[sig] = flags; | |
3889 } | |
3890 | |
3891 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
3892 // Check for overwrite. | |
3893 struct sigaction oldAct; | |
3894 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3895 | |
3896 void* oldhand = oldAct.sa_sigaction | |
3897 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3898 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3899 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3900 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3901 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3902 if (AllowUserSignalHandlers || !set_installed) { | |
3903 // Do not overwrite; user takes responsibility to forward to us. | |
3904 return; | |
3905 } else if (UseSignalChaining) { | |
3906 // save the old handler in jvm | |
3907 save_preinstalled_handler(sig, oldAct); | |
3908 // libjsig also interposes the sigaction() call below and saves the | |
3909 // old sigaction on it own. | |
3910 } else { | |
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3911 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
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3912 "%#lx for signal %d.", (long)oldhand, sig)); |
0 | 3913 } |
3914 } | |
3915 | |
3916 struct sigaction sigAct; | |
3917 sigfillset(&(sigAct.sa_mask)); | |
3918 sigAct.sa_handler = SIG_DFL; | |
3919 if (!set_installed) { | |
3920 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3921 } else { | |
3922 sigAct.sa_sigaction = signalHandler; | |
3923 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3924 } | |
3925 // Save flags, which are set by ours | |
3926 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3927 sigflags[sig] = sigAct.sa_flags; | |
3928 | |
3929 int ret = sigaction(sig, &sigAct, &oldAct); | |
3930 assert(ret == 0, "check"); | |
3931 | |
3932 void* oldhand2 = oldAct.sa_sigaction | |
3933 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3934 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3935 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3936 } | |
3937 | |
3938 // install signal handlers for signals that HotSpot needs to | |
3939 // handle in order to support Java-level exception handling. | |
3940 | |
3941 void os::Linux::install_signal_handlers() { | |
3942 if (!signal_handlers_are_installed) { | |
3943 signal_handlers_are_installed = true; | |
3944 | |
3945 // signal-chaining | |
3946 typedef void (*signal_setting_t)(); | |
3947 signal_setting_t begin_signal_setting = NULL; | |
3948 signal_setting_t end_signal_setting = NULL; | |
3949 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3950 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3951 if (begin_signal_setting != NULL) { | |
3952 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3953 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3954 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3955 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3956 libjsig_is_loaded = true; | |
3957 assert(UseSignalChaining, "should enable signal-chaining"); | |
3958 } | |
3959 if (libjsig_is_loaded) { | |
3960 // Tell libjsig jvm is setting signal handlers | |
3961 (*begin_signal_setting)(); | |
3962 } | |
3963 | |
3964 set_signal_handler(SIGSEGV, true); | |
3965 set_signal_handler(SIGPIPE, true); | |
3966 set_signal_handler(SIGBUS, true); | |
3967 set_signal_handler(SIGILL, true); | |
3968 set_signal_handler(SIGFPE, true); | |
3969 set_signal_handler(SIGXFSZ, true); | |
3970 | |
3971 if (libjsig_is_loaded) { | |
3972 // Tell libjsig jvm finishes setting signal handlers | |
3973 (*end_signal_setting)(); | |
3974 } | |
3975 | |
3976 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
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3977 // and if UserSignalHandler is installed all bets are off. |
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3978 // Log that signal checking is off only if -verbose:jni is specified. |
0 | 3979 if (CheckJNICalls) { |
3980 if (libjsig_is_loaded) { | |
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3981 if (PrintJNIResolving) { |
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3982 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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3983 } |
0 | 3984 check_signals = false; |
3985 } | |
3986 if (AllowUserSignalHandlers) { | |
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3987 if (PrintJNIResolving) { |
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3988 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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3989 } |
0 | 3990 check_signals = false; |
3991 } | |
3992 } | |
3993 } | |
3994 } | |
3995 | |
3996 // This is the fastest way to get thread cpu time on Linux. | |
3997 // Returns cpu time (user+sys) for any thread, not only for current. | |
3998 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
3999 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
4000 // For reference, please, see IEEE Std 1003.1-2004: | |
4001 // http://www.unix.org/single_unix_specification | |
4002 | |
4003 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
4004 struct timespec tp; | |
4005 int rc = os::Linux::clock_gettime(clockid, &tp); | |
4006 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
4007 | |
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4082
diff
changeset
|
4008 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
0 | 4009 } |
4010 | |
4011 ///// | |
4012 // glibc on Linux platform uses non-documented flag | |
4013 // to indicate, that some special sort of signal | |
4014 // trampoline is used. | |
4015 // We will never set this flag, and we should | |
4016 // ignore this flag in our diagnostic | |
4017 #ifdef SIGNIFICANT_SIGNAL_MASK | |
4018 #undef SIGNIFICANT_SIGNAL_MASK | |
4019 #endif | |
4020 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
4021 | |
4022 static const char* get_signal_handler_name(address handler, | |
4023 char* buf, int buflen) { | |
4024 int offset; | |
4025 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
4026 if (found) { | |
4027 // skip directory names | |
4028 const char *p1, *p2; | |
4029 p1 = buf; | |
4030 size_t len = strlen(os::file_separator()); | |
4031 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
4032 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
4033 } else { | |
4034 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
4035 } | |
4036 return buf; | |
4037 } | |
4038 | |
4039 static void print_signal_handler(outputStream* st, int sig, | |
4040 char* buf, size_t buflen) { | |
4041 struct sigaction sa; | |
4042 | |
4043 sigaction(sig, NULL, &sa); | |
4044 | |
4045 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
4046 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4047 | |
4048 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
4049 | |
4050 address handler = (sa.sa_flags & SA_SIGINFO) | |
4051 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
4052 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
4053 | |
4054 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
4055 st->print("SIG_DFL"); | |
4056 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
4057 st->print("SIG_IGN"); | |
4058 } else { | |
4059 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
4060 } | |
4061 | |
4062 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
4063 | |
4064 address rh = VMError::get_resetted_sighandler(sig); | |
4065 // May be, handler was resetted by VMError? | |
4066 if(rh != NULL) { | |
4067 handler = rh; | |
4068 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
4069 } | |
4070 | |
4071 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
4072 | |
4073 // Check: is it our handler? | |
4074 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
4075 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
4076 // It is our signal handler | |
4077 // check for flags, reset system-used one! | |
4078 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4079 st->print( | |
4080 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
4081 os::Linux::get_our_sigflags(sig)); | |
4082 } | |
4083 } | |
4084 st->cr(); | |
4085 } | |
4086 | |
4087 | |
4088 #define DO_SIGNAL_CHECK(sig) \ | |
4089 if (!sigismember(&check_signal_done, sig)) \ | |
4090 os::Linux::check_signal_handler(sig) | |
4091 | |
4092 // This method is a periodic task to check for misbehaving JNI applications | |
4093 // under CheckJNI, we can add any periodic checks here | |
4094 | |
4095 void os::run_periodic_checks() { | |
4096 | |
4097 if (check_signals == false) return; | |
4098 | |
4099 // SEGV and BUS if overridden could potentially prevent | |
4100 // generation of hs*.log in the event of a crash, debugging | |
4101 // such a case can be very challenging, so we absolutely | |
4102 // check the following for a good measure: | |
4103 DO_SIGNAL_CHECK(SIGSEGV); | |
4104 DO_SIGNAL_CHECK(SIGILL); | |
4105 DO_SIGNAL_CHECK(SIGFPE); | |
4106 DO_SIGNAL_CHECK(SIGBUS); | |
4107 DO_SIGNAL_CHECK(SIGPIPE); | |
4108 DO_SIGNAL_CHECK(SIGXFSZ); | |
4109 | |
4110 | |
4111 // ReduceSignalUsage allows the user to override these handlers | |
4112 // see comments at the very top and jvm_solaris.h | |
4113 if (!ReduceSignalUsage) { | |
4114 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
4115 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
4116 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
4117 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
4118 } | |
4119 | |
4120 DO_SIGNAL_CHECK(SR_signum); | |
4121 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
4122 } | |
4123 | |
4124 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
4125 | |
4126 static os_sigaction_t os_sigaction = NULL; | |
4127 | |
4128 void os::Linux::check_signal_handler(int sig) { | |
4129 char buf[O_BUFLEN]; | |
4130 address jvmHandler = NULL; | |
4131 | |
4132 | |
4133 struct sigaction act; | |
4134 if (os_sigaction == NULL) { | |
4135 // only trust the default sigaction, in case it has been interposed | |
4136 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
4137 if (os_sigaction == NULL) return; | |
4138 } | |
4139 | |
4140 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
4141 | |
4142 | |
4143 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
4144 | |
4145 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
4146 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
4147 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
4148 | |
4149 | |
4150 switch(sig) { | |
4151 case SIGSEGV: | |
4152 case SIGBUS: | |
4153 case SIGFPE: | |
4154 case SIGPIPE: | |
4155 case SIGILL: | |
4156 case SIGXFSZ: | |
4157 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
4158 break; | |
4159 | |
4160 case SHUTDOWN1_SIGNAL: | |
4161 case SHUTDOWN2_SIGNAL: | |
4162 case SHUTDOWN3_SIGNAL: | |
4163 case BREAK_SIGNAL: | |
4164 jvmHandler = (address)user_handler(); | |
4165 break; | |
4166 | |
4167 case INTERRUPT_SIGNAL: | |
4168 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
4169 break; | |
4170 | |
4171 default: | |
4172 if (sig == SR_signum) { | |
4173 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
4174 } else { | |
4175 return; | |
4176 } | |
4177 break; | |
4178 } | |
4179 | |
4180 if (thisHandler != jvmHandler) { | |
4181 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
4182 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
4183 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
4184 // No need to check this sig any longer | |
4185 sigaddset(&check_signal_done, sig); | |
4186 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
4187 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
4188 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
4189 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
4190 // No need to check this sig any longer | |
4191 sigaddset(&check_signal_done, sig); | |
4192 } | |
4193 | |
4194 // Dump all the signal | |
4195 if (sigismember(&check_signal_done, sig)) { | |
4196 print_signal_handlers(tty, buf, O_BUFLEN); | |
4197 } | |
4198 } | |
4199 | |
4200 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
4201 | |
4202 extern bool signal_name(int signo, char* buf, size_t len); | |
4203 | |
4204 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
4205 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
4206 // signal | |
4207 if (!signal_name(exception_code, buf, size)) { | |
4208 jio_snprintf(buf, size, "SIG%d", exception_code); | |
4209 } | |
4210 return buf; | |
4211 } else { | |
4212 return NULL; | |
4213 } | |
4214 } | |
4215 | |
4216 // this is called _before_ the most of global arguments have been parsed | |
4217 void os::init(void) { | |
4218 char dummy; /* used to get a guess on initial stack address */ | |
4219 // first_hrtime = gethrtime(); | |
4220 | |
4221 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
4222 // is different than the pid of the java launcher thread. | |
4223 // So, on Linux, the launcher thread pid is passed to the VM | |
4224 // via the sun.java.launcher.pid property. | |
4225 // Use this property instead of getpid() if it was correctly passed. | |
4226 // See bug 6351349. | |
4227 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
4228 | |
4229 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
4230 | |
4231 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
4232 | |
4233 init_random(1234567); | |
4234 | |
4235 ThreadCritical::initialize(); | |
4236 | |
4237 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
4238 if (Linux::page_size() == -1) { | |
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4239 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4240 strerror(errno))); |
0 | 4241 } |
4242 init_page_sizes((size_t) Linux::page_size()); | |
4243 | |
4244 Linux::initialize_system_info(); | |
4245 | |
4246 // main_thread points to the aboriginal thread | |
4247 Linux::_main_thread = pthread_self(); | |
4248 | |
4249 Linux::clock_init(); | |
4250 initial_time_count = os::elapsed_counter(); | |
242 | 4251 pthread_mutex_init(&dl_mutex, NULL); |
0 | 4252 } |
4253 | |
4254 // To install functions for atexit system call | |
4255 extern "C" { | |
4256 static void perfMemory_exit_helper() { | |
4257 perfMemory_exit(); | |
4258 } | |
4259 } | |
4260 | |
4261 // this is called _after_ the global arguments have been parsed | |
4262 jint os::init_2(void) | |
4263 { | |
4264 Linux::fast_thread_clock_init(); | |
4265 | |
4266 // Allocate a single page and mark it as readable for safepoint polling | |
4267 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4268 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
4269 | |
4270 os::set_polling_page( polling_page ); | |
4271 | |
4272 #ifndef PRODUCT | |
4273 if(Verbose && PrintMiscellaneous) | |
4274 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
4275 #endif | |
4276 | |
4277 if (!UseMembar) { | |
4278 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
4279 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
4280 os::set_memory_serialize_page( mem_serialize_page ); | |
4281 | |
4282 #ifndef PRODUCT | |
4283 if(Verbose && PrintMiscellaneous) | |
4284 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
4285 #endif | |
4286 } | |
4287 | |
3318
188c9a5d6a6d
7040485: Use transparent huge page on linux by default
iveresov
parents:
3292
diff
changeset
|
4288 os::large_page_init(); |
0 | 4289 |
4290 // initialize suspend/resume support - must do this before signal_sets_init() | |
4291 if (SR_initialize() != 0) { | |
4292 perror("SR_initialize failed"); | |
4293 return JNI_ERR; | |
4294 } | |
4295 | |
4296 Linux::signal_sets_init(); | |
4297 Linux::install_signal_handlers(); | |
4298 | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4299 // 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
|
4300 // the java system classes, including StackOverflowError - depends on page |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4301 // 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
|
4302 // 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
|
4303 // class initialization depending on 32 or 64 bit VM. |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4304 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4305 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4306 2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::page_size()); |
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4307 |
0 | 4308 size_t threadStackSizeInBytes = ThreadStackSize * K; |
4309 if (threadStackSizeInBytes != 0 && | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4310 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
0 | 4311 tty->print_cr("\nThe stack size specified is too small, " |
4312 "Specify at least %dk", | |
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4313 os::Linux::min_stack_allowed/ K); |
0 | 4314 return JNI_ERR; |
4315 } | |
4316 | |
4317 // Make the stack size a multiple of the page size so that | |
4318 // the yellow/red zones can be guarded. | |
4319 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
4320 vm_page_size())); | |
4321 | |
4322 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
4323 | |
4324 Linux::libpthread_init(); | |
4325 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
4326 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
4327 Linux::glibc_version(), Linux::libpthread_version(), | |
4328 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
4329 } | |
4330 | |
141 | 4331 if (UseNUMA) { |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4332 if (!Linux::libnuma_init()) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4333 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4334 } else { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4335 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
|
4336 // There's only one node(they start from 0), disable NUMA. |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4337 UseNUMA = false; |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4338 } |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4339 } |
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4340 // 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
|
4341 // 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
|
4342 // 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
|
4343 // disable adaptive resizing. |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4344 if (UseNUMA && UseLargePages && UseSHM) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4345 if (!FLAG_IS_DEFAULT(UseNUMA)) { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4346 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
|
4347 UseLargePages = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4348 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4349 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
|
4350 UseAdaptiveSizePolicy = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4351 UseAdaptiveNUMAChunkSizing = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4352 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4353 } else { |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4354 UseNUMA = false; |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4355 } |
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4356 } |
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4357 if (!UseNUMA && ForceNUMA) { |
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4358 UseNUMA = true; |
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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|
4359 } |
141 | 4360 } |
4361 | |
0 | 4362 if (MaxFDLimit) { |
4363 // set the number of file descriptors to max. print out error | |
4364 // if getrlimit/setrlimit fails but continue regardless. | |
4365 struct rlimit nbr_files; | |
4366 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
4367 if (status != 0) { | |
4368 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4369 perror("os::init_2 getrlimit failed"); | |
4370 } else { | |
4371 nbr_files.rlim_cur = nbr_files.rlim_max; | |
4372 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
4373 if (status != 0) { | |
4374 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
4375 perror("os::init_2 setrlimit failed"); | |
4376 } | |
4377 } | |
4378 } | |
4379 | |
4380 // Initialize lock used to serialize thread creation (see os::create_thread) | |
4381 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
4382 | |
4383 // at-exit methods are called in the reverse order of their registration. | |
4384 // atexit functions are called on return from main or as a result of a | |
4385 // call to exit(3C). There can be only 32 of these functions registered | |
4386 // and atexit() does not set errno. | |
4387 | |
4388 if (PerfAllowAtExitRegistration) { | |
4389 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
4390 // atexit functions can be delayed until process exit time, which | |
4391 // can be problematic for embedded VM situations. Embedded VMs should | |
4392 // call DestroyJavaVM() to assure that VM resources are released. | |
4393 | |
4394 // note: perfMemory_exit_helper atexit function may be removed in | |
4395 // the future if the appropriate cleanup code can be added to the | |
4396 // VM_Exit VMOperation's doit method. | |
4397 if (atexit(perfMemory_exit_helper) != 0) { | |
4398 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
4399 } | |
4400 } | |
4401 | |
4402 // initialize thread priority policy | |
4403 prio_init(); | |
4404 | |
4405 return JNI_OK; | |
4406 } | |
4407 | |
1681
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6953477: Increase portability and flexibility of building Hotspot
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diff
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|
4408 // this is called at the end of vm_initialization |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
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3800
diff
changeset
|
4409 void os::init_3(void) |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4410 { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
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3800
diff
changeset
|
4411 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
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3800
diff
changeset
|
4412 // Start the MemNotifyThread |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4413 if (LowMemoryProtection) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4414 MemNotifyThread::start(); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
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3800
diff
changeset
|
4415 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
4416 return; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
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3800
diff
changeset
|
4417 #endif |
b0b8491925fe
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jcoomes
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3800
diff
changeset
|
4418 } |
1681
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changeset
|
4419 |
0 | 4420 // Mark the polling page as unreadable |
4421 void os::make_polling_page_unreadable(void) { | |
4422 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
4423 fatal("Could not disable polling page"); | |
4424 }; | |
4425 | |
4426 // Mark the polling page as readable | |
4427 void os::make_polling_page_readable(void) { | |
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
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235
diff
changeset
|
4428 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
0 | 4429 fatal("Could not enable polling page"); |
237
1fdb98a17101
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|
4430 } |
0 | 4431 }; |
4432 | |
4433 int os::active_processor_count() { | |
4434 // Linux doesn't yet have a (official) notion of processor sets, | |
4435 // so just return the number of online processors. | |
4436 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
4437 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
4438 return online_cpus; | |
4439 } | |
4440 | |
4006 | 4441 void os::set_native_thread_name(const char *name) { |
4442 // Not yet implemented. | |
4443 return; | |
4444 } | |
4445 | |
0 | 4446 bool os::distribute_processes(uint length, uint* distribution) { |
4447 // Not yet implemented. | |
4448 return false; | |
4449 } | |
4450 | |
4451 bool os::bind_to_processor(uint processor_id) { | |
4452 // Not yet implemented. | |
4453 return false; | |
4454 } | |
4455 | |
4456 /// | |
4457 | |
4458 // Suspends the target using the signal mechanism and then grabs the PC before | |
4459 // resuming the target. Used by the flat-profiler only | |
4460 ExtendedPC os::get_thread_pc(Thread* thread) { | |
4461 // Make sure that it is called by the watcher for the VMThread | |
4462 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
4463 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
4464 | |
4465 ExtendedPC epc; | |
4466 | |
4467 OSThread* osthread = thread->osthread(); | |
4468 if (do_suspend(osthread)) { | |
4469 if (osthread->ucontext() != NULL) { | |
4470 epc = os::Linux::ucontext_get_pc(osthread->ucontext()); | |
4471 } else { | |
4472 // NULL context is unexpected, double-check this is the VMThread | |
4473 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
4474 } | |
4475 do_resume(osthread); | |
4476 } | |
4477 // failure means pthread_kill failed for some reason - arguably this is | |
4478 // a fatal problem, but such problems are ignored elsewhere | |
4479 | |
4480 return epc; | |
4481 } | |
4482 | |
4483 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
4484 { | |
4485 if (is_NPTL()) { | |
4486 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4487 } else { | |
4488 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
4489 // word back to default 64bit precision if condvar is signaled. Java | |
4490 // wants 53bit precision. Save and restore current value. | |
4491 int fpu = get_fpu_control_word(); | |
4492 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
4493 set_fpu_control_word(fpu); | |
4494 return status; | |
4495 } | |
4496 } | |
4497 | |
4498 //////////////////////////////////////////////////////////////////////////////// | |
4499 // debug support | |
4500 | |
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diff
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|
4501 bool os::find(address addr, outputStream* st) { |
0 | 4502 Dl_info dlinfo; |
4503 memset(&dlinfo, 0, sizeof(dlinfo)); | |
4504 if (dladdr(addr, &dlinfo)) { | |
1681
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changeset
|
4505 st->print(PTR_FORMAT ": ", addr); |
0 | 4506 if (dlinfo.dli_sname != NULL) { |
1681
126ea7725993
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1642
diff
changeset
|
4507 st->print("%s+%#x", dlinfo.dli_sname, |
0 | 4508 addr - (intptr_t)dlinfo.dli_saddr); |
4509 } else if (dlinfo.dli_fname) { | |
1681
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1642
diff
changeset
|
4510 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
0 | 4511 } else { |
1681
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diff
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|
4512 st->print("<absolute address>"); |
0 | 4513 } |
4514 if (dlinfo.dli_fname) { | |
1681
126ea7725993
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changeset
|
4515 st->print(" in %s", dlinfo.dli_fname); |
0 | 4516 } |
4517 if (dlinfo.dli_fbase) { | |
1681
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|
4518 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
0 | 4519 } |
1681
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diff
changeset
|
4520 st->cr(); |
0 | 4521 |
4522 if (Verbose) { | |
4523 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
4524 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
|
4525 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
0 | 4526 address lowest = (address) dlinfo.dli_sname; |
4527 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
4528 if (begin < lowest) begin = lowest; | |
4529 Dl_info dlinfo2; | |
4530 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
4531 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
4532 end = (address) dlinfo2.dli_saddr; | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
1642
diff
changeset
|
4533 Disassembler::decode(begin, end, st); |
0 | 4534 } |
4535 return true; | |
4536 } | |
4537 return false; | |
4538 } | |
4539 | |
4540 //////////////////////////////////////////////////////////////////////////////// | |
4541 // misc | |
4542 | |
4543 // This does not do anything on Linux. This is basically a hook for being | |
4544 // able to use structured exception handling (thread-local exception filters) | |
4545 // on, e.g., Win32. | |
4546 void | |
4547 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
4548 JavaCallArguments* args, Thread* thread) { | |
4549 f(value, method, args, thread); | |
4550 } | |
4551 | |
4552 void os::print_statistics() { | |
4553 } | |
4554 | |
4555 int os::message_box(const char* title, const char* message) { | |
4556 int i; | |
4557 fdStream err(defaultStream::error_fd()); | |
4558 for (i = 0; i < 78; i++) err.print_raw("="); | |
4559 err.cr(); | |
4560 err.print_raw_cr(title); | |
4561 for (i = 0; i < 78; i++) err.print_raw("-"); | |
4562 err.cr(); | |
4563 err.print_raw_cr(message); | |
4564 for (i = 0; i < 78; i++) err.print_raw("="); | |
4565 err.cr(); | |
4566 | |
4567 char buf[16]; | |
4568 // Prevent process from exiting upon "read error" without consuming all CPU | |
4569 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
4570 | |
4571 return buf[0] == 'y' || buf[0] == 'Y'; | |
4572 } | |
4573 | |
4574 int os::stat(const char *path, struct stat *sbuf) { | |
4575 char pathbuf[MAX_PATH]; | |
4576 if (strlen(path) > MAX_PATH - 1) { | |
4577 errno = ENAMETOOLONG; | |
4578 return -1; | |
4579 } | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4580 os::native_path(strcpy(pathbuf, path)); |
0 | 4581 return ::stat(pathbuf, sbuf); |
4582 } | |
4583 | |
4584 bool os::check_heap(bool force) { | |
4585 return true; | |
4586 } | |
4587 | |
4588 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
4589 return ::vsnprintf(buf, count, format, args); | |
4590 } | |
4591 | |
4592 // Is a (classpath) directory empty? | |
4593 bool os::dir_is_empty(const char* path) { | |
4594 DIR *dir = NULL; | |
4595 struct dirent *ptr; | |
4596 | |
4597 dir = opendir(path); | |
4598 if (dir == NULL) return true; | |
4599 | |
4600 /* Scan the directory */ | |
4601 bool result = true; | |
4602 char buf[sizeof(struct dirent) + MAX_PATH]; | |
4603 while (result && (ptr = ::readdir(dir)) != NULL) { | |
4604 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
4605 result = false; | |
4606 } | |
4607 } | |
4608 closedir(dir); | |
4609 return result; | |
4610 } | |
4611 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4612 // This code originates from JDK's sysOpen and open64_w |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4613 // 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
|
4614 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4615 #ifndef O_DELETE |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4616 #define O_DELETE 0x10000 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4617 #endif |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4618 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4619 // Open a file. Unlink the file immediately after open returns |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4620 // if the specified oflag has the O_DELETE flag set. |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4621 // 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
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1972
diff
changeset
|
4622 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4623 int os::open(const char *path, int oflag, int mode) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4624 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4625 if (strlen(path) > MAX_PATH - 1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4626 errno = ENAMETOOLONG; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4627 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4628 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4629 int fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4630 int o_delete = (oflag & O_DELETE); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4631 oflag = oflag & ~O_DELETE; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4632 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4633 fd = ::open64(path, oflag, mode); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4634 if (fd == -1) return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4635 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4636 //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
|
4637 { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4638 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4639 int ret = ::fstat64(fd, &buf64); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4640 int st_mode = buf64.st_mode; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4641 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4642 if (ret != -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4643 if ((st_mode & S_IFMT) == S_IFDIR) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4644 errno = EISDIR; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4645 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4646 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4647 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4648 } else { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4649 ::close(fd); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4650 return -1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4651 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
4652 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4653 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4654 /* |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4655 * All file descriptors that are opened in the JVM and not |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
4656 * specifically destined for a subprocess should have the |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4657 * 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
|
4658 * 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
|
4659 * 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
|
4660 * UNIXProcess.c), and this in turn might: |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4661 * |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4662 * - cause end-of-file to fail to be detected on some file |
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|
4663 * descriptors, resulting in mysterious hangs, or |
828eafbd85cc
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diff
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|
4664 * |
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|
4665 * - might cause an fopen in the subprocess to fail on a system |
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diff
changeset
|
4666 * suffering from bug 1085341. |
828eafbd85cc
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diff
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|
4667 * |
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diff
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|
4668 * (Yes, the default setting of the close-on-exec flag is a Unix |
828eafbd85cc
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1972
diff
changeset
|
4669 * design flaw) |
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1972
diff
changeset
|
4670 * |
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1972
diff
changeset
|
4671 * See: |
828eafbd85cc
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|
4672 * 1085341: 32-bit stdio routines should support file descriptors >255 |
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diff
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|
4673 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
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diff
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|
4674 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
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diff
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|
4675 */ |
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diff
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|
4676 #ifdef FD_CLOEXEC |
828eafbd85cc
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1972
diff
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|
4677 { |
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diff
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|
4678 int flags = ::fcntl(fd, F_GETFD); |
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diff
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|
4679 if (flags != -1) |
828eafbd85cc
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diff
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|
4680 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
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diff
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|
4681 } |
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diff
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|
4682 #endif |
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diff
changeset
|
4683 |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4684 if (o_delete != 0) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4685 ::unlink(path); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4686 } |
828eafbd85cc
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parents:
1972
diff
changeset
|
4687 return fd; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4688 } |
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1972
diff
changeset
|
4689 |
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|
4690 |
0 | 4691 // create binary file, rewriting existing file if required |
4692 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4693 int oflags = O_WRONLY | O_CREAT; | |
4694 if (!rewrite_existing) { | |
4695 oflags |= O_EXCL; | |
4696 } | |
4697 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
4698 } | |
4699 | |
4700 // return current position of file pointer | |
4701 jlong os::current_file_offset(int fd) { | |
4702 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
4703 } | |
4704 | |
4705 // move file pointer to the specified offset | |
4706 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4707 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
4708 } | |
4709 | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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|
4710 // This code originates from JDK's sysAvailable |
828eafbd85cc
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diff
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|
4711 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
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|
4712 |
828eafbd85cc
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diff
changeset
|
4713 int os::available(int fd, jlong *bytes) { |
828eafbd85cc
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diff
changeset
|
4714 jlong cur, end; |
828eafbd85cc
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parents:
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diff
changeset
|
4715 int mode; |
828eafbd85cc
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ikrylov
parents:
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diff
changeset
|
4716 struct stat64 buf64; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
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|
4717 |
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diff
changeset
|
4718 if (::fstat64(fd, &buf64) >= 0) { |
828eafbd85cc
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diff
changeset
|
4719 mode = buf64.st_mode; |
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diff
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|
4720 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
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6348631: remove the use of the HPI library from Hotspot
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changeset
|
4721 /* |
828eafbd85cc
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1972
diff
changeset
|
4722 * XXX: is the following call interruptible? If so, this might |
828eafbd85cc
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1972
diff
changeset
|
4723 * need to go through the INTERRUPT_IO() wrapper as for other |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4724 * blocking, interruptible calls in this file. |
828eafbd85cc
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parents:
1972
diff
changeset
|
4725 */ |
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parents:
1972
diff
changeset
|
4726 int n; |
828eafbd85cc
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1972
diff
changeset
|
4727 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
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diff
changeset
|
4728 *bytes = n; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
4729 return 1; |
828eafbd85cc
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parents:
1972
diff
changeset
|
4730 } |
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parents:
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diff
changeset
|
4731 } |
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parents:
1972
diff
changeset
|
4732 } |
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diff
changeset
|
4733 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4734 return 0; |
828eafbd85cc
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parents:
1972
diff
changeset
|
4735 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4736 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4737 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4738 return 0; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4739 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4740 *bytes = end - cur; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4741 return 1; |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
4742 } |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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parents:
1972
diff
changeset
|
4743 |
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4744 int os::socket_available(int fd, jint *pbytes) { |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4745 // Linux doc says EINTR not returned, unlike Solaris |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4746 int ret = ::ioctl(fd, FIONREAD, pbytes); |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4747 |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4748 //%% note ioctl can return 0 when successful, JVM_SocketAvailable |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4749 // is expected to return 0 on failure and 1 on success to the jdk. |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4750 return (ret < 0) ? 0 : 1; |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4751 } |
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
4752 |
0 | 4753 // Map a block of memory. |
6197 | 4754 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
0 | 4755 char *addr, size_t bytes, bool read_only, |
4756 bool allow_exec) { | |
4757 int prot; | |
5909 | 4758 int flags = MAP_PRIVATE; |
0 | 4759 |
4760 if (read_only) { | |
4761 prot = PROT_READ; | |
4762 } else { | |
4763 prot = PROT_READ | PROT_WRITE; | |
4764 } | |
4765 | |
4766 if (allow_exec) { | |
4767 prot |= PROT_EXEC; | |
4768 } | |
4769 | |
4770 if (addr != NULL) { | |
4771 flags |= MAP_FIXED; | |
4772 } | |
4773 | |
4774 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4775 fd, file_offset); | |
4776 if (mapped_address == MAP_FAILED) { | |
4777 return NULL; | |
4778 } | |
4779 return mapped_address; | |
4780 } | |
4781 | |
4782 | |
4783 // Remap a block of memory. | |
6197 | 4784 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
0 | 4785 char *addr, size_t bytes, bool read_only, |
4786 bool allow_exec) { | |
4787 // same as map_memory() on this OS | |
4788 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4789 allow_exec); | |
4790 } | |
4791 | |
4792 | |
4793 // Unmap a block of memory. | |
6197 | 4794 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
0 | 4795 return munmap(addr, bytes) == 0; |
4796 } | |
4797 | |
4798 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
4799 | |
4800 static clockid_t thread_cpu_clockid(Thread* thread) { | |
4801 pthread_t tid = thread->osthread()->pthread_id(); | |
4802 clockid_t clockid; | |
4803 | |
4804 // Get thread clockid | |
4805 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
4806 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
4807 return clockid; | |
4808 } | |
4809 | |
4810 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4811 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4812 // of a thread. | |
4813 // | |
4814 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4815 // the fast estimate available on the platform. | |
4816 | |
4817 jlong os::current_thread_cpu_time() { | |
4818 if (os::Linux::supports_fast_thread_cpu_time()) { | |
4819 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
4820 } else { | |
4821 // return user + sys since the cost is the same | |
4822 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
4823 } | |
4824 } | |
4825 | |
4826 jlong os::thread_cpu_time(Thread* thread) { | |
4827 // consistent with what current_thread_cpu_time() returns | |
4828 if (os::Linux::supports_fast_thread_cpu_time()) { | |
4829 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
4830 } else { | |
4831 return slow_thread_cpu_time(thread, true /* user + sys */); | |
4832 } | |
4833 } | |
4834 | |
4835 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4836 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
4837 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
4838 } else { | |
4839 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
4840 } | |
4841 } | |
4842 | |
4843 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4844 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
4845 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
4846 } else { | |
4847 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
4848 } | |
4849 } | |
4850 | |
4851 // | |
4852 // -1 on error. | |
4853 // | |
4854 | |
4855 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4856 static bool proc_task_unchecked = true; | |
4857 static const char *proc_stat_path = "/proc/%d/stat"; | |
4858 pid_t tid = thread->osthread()->thread_id(); | |
4859 char *s; | |
4860 char stat[2048]; | |
4861 int statlen; | |
4862 char proc_name[64]; | |
4863 int count; | |
4864 long sys_time, user_time; | |
1681
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6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4865 char cdummy; |
0 | 4866 int idummy; |
4867 long ldummy; | |
4868 FILE *fp; | |
4869 | |
4870 // The /proc/<tid>/stat aggregates per-process usage on | |
4871 // new Linux kernels 2.6+ where NPTL is supported. | |
4872 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
4873 // See bug 6328462. | |
8099
4c1d8002ffb1
8004495: [parfait] False positive Buffer overflow in hotspot/src/os/linux/vm/os_linux.cpp
hseigel
parents:
8067
diff
changeset
|
4874 // There possibly can be cases where there is no directory |
4c1d8002ffb1
8004495: [parfait] False positive Buffer overflow in hotspot/src/os/linux/vm/os_linux.cpp
hseigel
parents:
8067
diff
changeset
|
4875 // /proc/self/task, so we check its availability. |
0 | 4876 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
4877 // This is executed only once | |
4878 proc_task_unchecked = false; | |
4879 fp = fopen("/proc/self/task", "r"); | |
4880 if (fp != NULL) { | |
4881 proc_stat_path = "/proc/self/task/%d/stat"; | |
4882 fclose(fp); | |
4883 } | |
4884 } | |
4885 | |
4886 sprintf(proc_name, proc_stat_path, tid); | |
4887 fp = fopen(proc_name, "r"); | |
4888 if ( fp == NULL ) return -1; | |
4889 statlen = fread(stat, 1, 2047, fp); | |
4890 stat[statlen] = '\0'; | |
4891 fclose(fp); | |
4892 | |
4893 // Skip pid and the command string. Note that we could be dealing with | |
4894 // weird command names, e.g. user could decide to rename java launcher | |
4895 // to "java 1.4.2 :)", then the stat file would look like | |
4896 // 1234 (java 1.4.2 :)) R ... ... | |
4897 // We don't really need to know the command string, just find the last | |
4898 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
4899 s = strrchr(stat, ')'); | |
4900 if (s == NULL ) return -1; | |
4901 | |
4902 // Skip blank chars | |
4903 do s++; while (isspace(*s)); | |
4904 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4905 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4906 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
0 | 4907 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
4908 &user_time, &sys_time); | |
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bobv
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1642
diff
changeset
|
4909 if ( count != 13 ) return -1; |
0 | 4910 if (user_sys_cpu_time) { |
4911 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
4912 } else { | |
4913 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
4914 } | |
4915 } | |
4916 | |
4917 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4918 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4919 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4920 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4921 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4922 } | |
4923 | |
4924 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4925 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4926 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4927 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4928 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4929 } | |
4930 | |
4931 bool os::is_thread_cpu_time_supported() { | |
4932 return true; | |
4933 } | |
4934 | |
4935 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4936 // Linux doesn't yet have a (official) notion of processor sets, | |
4937 // so just return the system wide load average. | |
4938 int os::loadavg(double loadavg[], int nelem) { | |
4939 return ::getloadavg(loadavg, nelem); | |
4940 } | |
4941 | |
4942 void os::pause() { | |
4943 char filename[MAX_PATH]; | |
4944 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4945 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4946 } else { | |
4947 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4948 } | |
4949 | |
4950 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4951 if (fd != -1) { | |
4952 struct stat buf; | |
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4953 ::close(fd); |
0 | 4954 while (::stat(filename, &buf) == 0) { |
4955 (void)::poll(NULL, 0, 100); | |
4956 } | |
4957 } else { | |
4958 jio_fprintf(stderr, | |
4959 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4960 } | |
4961 } | |
4962 | |
4963 | |
4964 // Refer to the comments in os_solaris.cpp park-unpark. | |
4965 // | |
4966 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4967 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4968 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4969 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4970 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4971 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4972 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4973 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4974 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4975 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4976 // of libpthread avoids the problem, but isn't practical. | |
4977 // | |
4978 // Possible remedies: | |
4979 // | |
4980 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4981 // This is palliative and probabilistic, however. If the thread is preempted | |
4982 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4983 // than the minimum period may have passed, and the abstime may be stale (in the | |
4984 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4985 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4986 // | |
4987 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4988 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4989 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4990 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4991 // thread. | |
4992 // | |
4993 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4994 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4995 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4996 // This also works well. In fact it avoids kernel-level scalability impediments | |
4997 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4998 // timers in a graceful fashion. | |
4999 // | |
5000 // 4. When the abstime value is in the past it appears that control returns | |
5001 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
5002 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
5003 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
5004 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
5005 // It may be possible to avoid reinitialization by checking the return | |
5006 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
5007 // condvar we must establish the invariant that cond_signal() is only called | |
5008 // within critical sections protected by the adjunct mutex. This prevents | |
5009 // cond_signal() from "seeing" a condvar that's in the midst of being | |
5010 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
5011 // desirable signal-after-unlock optimization that avoids futile context switching. | |
5012 // | |
5013 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
5014 // structure when a condvar is used or initialized. cond_destroy() would | |
5015 // release the helper structure. Our reinitialize-after-timedwait fix | |
5016 // put excessive stress on malloc/free and locks protecting the c-heap. | |
5017 // | |
5018 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
5019 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
5020 // and only enabling the work-around for vulnerable environments. | |
5021 | |
5022 // utility to compute the abstime argument to timedwait: | |
5023 // millis is the relative timeout time | |
5024 // abstime will be the absolute timeout time | |
5025 // TODO: replace compute_abstime() with unpackTime() | |
5026 | |
5027 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
5028 if (millis < 0) millis = 0; | |
5029 struct timeval now; | |
5030 int status = gettimeofday(&now, NULL); | |
5031 assert(status == 0, "gettimeofday"); | |
5032 jlong seconds = millis / 1000; | |
5033 millis %= 1000; | |
5034 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
5035 seconds = 50000000; | |
5036 } | |
5037 abstime->tv_sec = now.tv_sec + seconds; | |
5038 long usec = now.tv_usec + millis * 1000; | |
5039 if (usec >= 1000000) { | |
5040 abstime->tv_sec += 1; | |
5041 usec -= 1000000; | |
5042 } | |
5043 abstime->tv_nsec = usec * 1000; | |
5044 return abstime; | |
5045 } | |
5046 | |
5047 | |
5048 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
5049 // Conceptually TryPark() should be equivalent to park(0). | |
5050 | |
5051 int os::PlatformEvent::TryPark() { | |
5052 for (;;) { | |
5053 const int v = _Event ; | |
5054 guarantee ((v == 0) || (v == 1), "invariant") ; | |
5055 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
5056 } | |
5057 } | |
5058 | |
5059 void os::PlatformEvent::park() { // AKA "down()" | |
5060 // Invariant: Only the thread associated with the Event/PlatformEvent | |
5061 // may call park(). | |
5062 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
5063 int v ; | |
5064 for (;;) { | |
5065 v = _Event ; | |
5066 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5067 } | |
5068 guarantee (v >= 0, "invariant") ; | |
5069 if (v == 0) { | |
5070 // Do this the hard way by blocking ... | |
5071 int status = pthread_mutex_lock(_mutex); | |
5072 assert_status(status == 0, status, "mutex_lock"); | |
5073 guarantee (_nParked == 0, "invariant") ; | |
5074 ++ _nParked ; | |
5075 while (_Event < 0) { | |
5076 status = pthread_cond_wait(_cond, _mutex); | |
5077 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
5078 // Treat this the same as if the wait was interrupted | |
5079 if (status == ETIME) { status = EINTR; } | |
5080 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
5081 } | |
5082 -- _nParked ; | |
5083 | |
5084 _Event = 0 ; | |
5085 status = pthread_mutex_unlock(_mutex); | |
5086 assert_status(status == 0, status, "mutex_unlock"); | |
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5087 // Paranoia to ensure our locked and lock-free paths interact |
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5088 // correctly with each other. |
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5089 OrderAccess::fence(); |
0 | 5090 } |
5091 guarantee (_Event >= 0, "invariant") ; | |
5092 } | |
5093 | |
5094 int os::PlatformEvent::park(jlong millis) { | |
5095 guarantee (_nParked == 0, "invariant") ; | |
5096 | |
5097 int v ; | |
5098 for (;;) { | |
5099 v = _Event ; | |
5100 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
5101 } | |
5102 guarantee (v >= 0, "invariant") ; | |
5103 if (v != 0) return OS_OK ; | |
5104 | |
5105 // We do this the hard way, by blocking the thread. | |
5106 // Consider enforcing a minimum timeout value. | |
5107 struct timespec abst; | |
5108 compute_abstime(&abst, millis); | |
5109 | |
5110 int ret = OS_TIMEOUT; | |
5111 int status = pthread_mutex_lock(_mutex); | |
5112 assert_status(status == 0, status, "mutex_lock"); | |
5113 guarantee (_nParked == 0, "invariant") ; | |
5114 ++_nParked ; | |
5115 | |
5116 // Object.wait(timo) will return because of | |
5117 // (a) notification | |
5118 // (b) timeout | |
5119 // (c) thread.interrupt | |
5120 // | |
5121 // Thread.interrupt and object.notify{All} both call Event::set. | |
5122 // That is, we treat thread.interrupt as a special case of notification. | |
5123 // The underlying Solaris implementation, cond_timedwait, admits | |
5124 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
5125 // JVM from making those visible to Java code. As such, we must | |
5126 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
5127 // | |
5128 // TODO: properly differentiate simultaneous notify+interrupt. | |
5129 // In that case, we should propagate the notify to another waiter. | |
5130 | |
5131 while (_Event < 0) { | |
5132 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
5133 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5134 pthread_cond_destroy (_cond); | |
5135 pthread_cond_init (_cond, NULL) ; | |
5136 } | |
5137 assert_status(status == 0 || status == EINTR || | |
5138 status == ETIME || status == ETIMEDOUT, | |
5139 status, "cond_timedwait"); | |
5140 if (!FilterSpuriousWakeups) break ; // previous semantics | |
5141 if (status == ETIME || status == ETIMEDOUT) break ; | |
5142 // We consume and ignore EINTR and spurious wakeups. | |
5143 } | |
5144 --_nParked ; | |
5145 if (_Event >= 0) { | |
5146 ret = OS_OK; | |
5147 } | |
5148 _Event = 0 ; | |
5149 status = pthread_mutex_unlock(_mutex); | |
5150 assert_status(status == 0, status, "mutex_unlock"); | |
5151 assert (_nParked == 0, "invariant") ; | |
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5152 // Paranoia to ensure our locked and lock-free paths interact |
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5153 // correctly with each other. |
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5154 OrderAccess::fence(); |
0 | 5155 return ret; |
5156 } | |
5157 | |
5158 void os::PlatformEvent::unpark() { | |
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5159 // Transitions for _Event: |
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5160 // 0 :=> 1 |
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5161 // 1 :=> 1 |
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5162 // -1 :=> either 0 or 1; must signal target thread |
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5163 // That is, we can safely transition _Event from -1 to either |
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5164 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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5165 // unpark() calls. |
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5166 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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5167 // |
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5168 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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5169 // that it will take two back-to-back park() calls for the owning |
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5170 // thread to block. This has the benefit of forcing a spurious return |
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5171 // from the first park() call after an unpark() call which will help |
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5172 // shake out uses of park() and unpark() without condition variables. |
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5173 |
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5174 if (Atomic::xchg(1, &_Event) >= 0) return; |
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5175 |
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5176 // Wait for the thread associated with the event to vacate |
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5177 int status = pthread_mutex_lock(_mutex); |
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5178 assert_status(status == 0, status, "mutex_lock"); |
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5179 int AnyWaiters = _nParked; |
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5180 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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5181 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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5182 AnyWaiters = 0; |
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5183 pthread_cond_signal(_cond); |
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5184 } |
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5185 status = pthread_mutex_unlock(_mutex); |
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5186 assert_status(status == 0, status, "mutex_unlock"); |
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5187 if (AnyWaiters != 0) { |
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5188 status = pthread_cond_signal(_cond); |
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5189 assert_status(status == 0, status, "cond_signal"); |
0 | 5190 } |
5191 | |
5192 // Note that we signal() _after dropping the lock for "immortal" Events. | |
5193 // This is safe and avoids a common class of futile wakeups. In rare | |
5194 // circumstances this can cause a thread to return prematurely from | |
5195 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
5196 // simply re-test the condition and re-park itself. | |
5197 } | |
5198 | |
5199 | |
5200 // JSR166 | |
5201 // ------------------------------------------------------- | |
5202 | |
5203 /* | |
5204 * The solaris and linux implementations of park/unpark are fairly | |
5205 * conservative for now, but can be improved. They currently use a | |
5206 * mutex/condvar pair, plus a a count. | |
5207 * Park decrements count if > 0, else does a condvar wait. Unpark | |
5208 * sets count to 1 and signals condvar. Only one thread ever waits | |
5209 * on the condvar. Contention seen when trying to park implies that someone | |
5210 * is unparking you, so don't wait. And spurious returns are fine, so there | |
5211 * is no need to track notifications. | |
5212 */ | |
5213 | |
5214 #define MAX_SECS 100000000 | |
5215 /* | |
5216 * This code is common to linux and solaris and will be moved to a | |
5217 * common place in dolphin. | |
5218 * | |
5219 * The passed in time value is either a relative time in nanoseconds | |
5220 * or an absolute time in milliseconds. Either way it has to be unpacked | |
5221 * into suitable seconds and nanoseconds components and stored in the | |
5222 * given timespec structure. | |
5223 * Given time is a 64-bit value and the time_t used in the timespec is only | |
5224 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
5225 * overflow if times way in the future are given. Further on Solaris versions | |
5226 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
5227 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
5228 * As it will be 28 years before "now + 100000000" will overflow we can | |
5229 * ignore overflow and just impose a hard-limit on seconds using the value | |
5230 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
5231 * years from "now". | |
5232 */ | |
5233 | |
5234 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
5235 assert (time > 0, "convertTime"); | |
5236 | |
5237 struct timeval now; | |
5238 int status = gettimeofday(&now, NULL); | |
5239 assert(status == 0, "gettimeofday"); | |
5240 | |
5241 time_t max_secs = now.tv_sec + MAX_SECS; | |
5242 | |
5243 if (isAbsolute) { | |
5244 jlong secs = time / 1000; | |
5245 if (secs > max_secs) { | |
5246 absTime->tv_sec = max_secs; | |
5247 } | |
5248 else { | |
5249 absTime->tv_sec = secs; | |
5250 } | |
5251 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
5252 } | |
5253 else { | |
5254 jlong secs = time / NANOSECS_PER_SEC; | |
5255 if (secs >= MAX_SECS) { | |
5256 absTime->tv_sec = max_secs; | |
5257 absTime->tv_nsec = 0; | |
5258 } | |
5259 else { | |
5260 absTime->tv_sec = now.tv_sec + secs; | |
5261 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
5262 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
5263 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
5264 ++absTime->tv_sec; // note: this must be <= max_secs | |
5265 } | |
5266 } | |
5267 } | |
5268 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
5269 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
5270 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
5271 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
5272 } | |
5273 | |
5274 void Parker::park(bool isAbsolute, jlong time) { | |
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5275 // Ideally we'd do something useful while spinning, such |
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5276 // as calling unpackTime(). |
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5277 |
0 | 5278 // Optional fast-path check: |
5279 // Return immediately if a permit is available. | |
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5280 // We depend on Atomic::xchg() having full barrier semantics |
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5281 // since we are doing a lock-free update to _counter. |
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5282 if (Atomic::xchg(0, &_counter) > 0) return; |
0 | 5283 |
5284 Thread* thread = Thread::current(); | |
5285 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
5286 JavaThread *jt = (JavaThread *)thread; | |
5287 | |
5288 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
5289 // Check interrupt before trying to wait | |
5290 if (Thread::is_interrupted(thread, false)) { | |
5291 return; | |
5292 } | |
5293 | |
5294 // Next, demultiplex/decode time arguments | |
5295 timespec absTime; | |
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5296 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
0 | 5297 return; |
5298 } | |
5299 if (time > 0) { | |
5300 unpackTime(&absTime, isAbsolute, time); | |
5301 } | |
5302 | |
5303 | |
5304 // Enter safepoint region | |
5305 // Beware of deadlocks such as 6317397. | |
5306 // The per-thread Parker:: mutex is a classic leaf-lock. | |
5307 // In particular a thread must never block on the Threads_lock while | |
5308 // holding the Parker:: mutex. If safepoints are pending both the | |
5309 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
5310 ThreadBlockInVM tbivm(jt); | |
5311 | |
5312 // Don't wait if cannot get lock since interference arises from | |
5313 // unblocking. Also. check interrupt before trying wait | |
5314 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
5315 return; | |
5316 } | |
5317 | |
5318 int status ; | |
5319 if (_counter > 0) { // no wait needed | |
5320 _counter = 0; | |
5321 status = pthread_mutex_unlock(_mutex); | |
5322 assert (status == 0, "invariant") ; | |
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5323 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5324 // correctly with each other and Java-level accesses. |
1117
95e9083cf4a7
6822370: ReentrantReadWriteLock: threads hung when there are no threads holding onto the lock (Netra x4450)
dholmes
parents:
1010
diff
changeset
|
5325 OrderAccess::fence(); |
0 | 5326 return; |
5327 } | |
5328 | |
5329 #ifdef ASSERT | |
5330 // Don't catch signals while blocked; let the running threads have the signals. | |
5331 // (This allows a debugger to break into the running thread.) | |
5332 sigset_t oldsigs; | |
5333 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
5334 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
5335 #endif | |
5336 | |
5337 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5338 jt->set_suspend_equivalent(); | |
5339 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5340 | |
5341 if (time == 0) { | |
5342 status = pthread_cond_wait (_cond, _mutex) ; | |
5343 } else { | |
5344 status = os::Linux::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
5345 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5346 pthread_cond_destroy (_cond) ; | |
5347 pthread_cond_init (_cond, NULL); | |
5348 } | |
5349 } | |
5350 assert_status(status == 0 || status == EINTR || | |
5351 status == ETIME || status == ETIMEDOUT, | |
5352 status, "cond_timedwait"); | |
5353 | |
5354 #ifdef ASSERT | |
5355 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5356 #endif | |
5357 | |
5358 _counter = 0 ; | |
5359 status = pthread_mutex_unlock(_mutex) ; | |
5360 assert_status(status == 0, status, "invariant") ; | |
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5361 // Paranoia to ensure our locked and lock-free paths interact |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5362 // correctly with each other and Java-level accesses. |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5363 OrderAccess::fence(); |
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5364 |
0 | 5365 // If externally suspended while waiting, re-suspend |
5366 if (jt->handle_special_suspend_equivalent_condition()) { | |
5367 jt->java_suspend_self(); | |
5368 } | |
5369 } | |
5370 | |
5371 void Parker::unpark() { | |
5372 int s, status ; | |
5373 status = pthread_mutex_lock(_mutex); | |
5374 assert (status == 0, "invariant") ; | |
5375 s = _counter; | |
5376 _counter = 1; | |
5377 if (s < 1) { | |
5378 if (WorkAroundNPTLTimedWaitHang) { | |
5379 status = pthread_cond_signal (_cond) ; | |
5380 assert (status == 0, "invariant") ; | |
5381 status = pthread_mutex_unlock(_mutex); | |
5382 assert (status == 0, "invariant") ; | |
5383 } else { | |
5384 status = pthread_mutex_unlock(_mutex); | |
5385 assert (status == 0, "invariant") ; | |
5386 status = pthread_cond_signal (_cond) ; | |
5387 assert (status == 0, "invariant") ; | |
5388 } | |
5389 } else { | |
5390 pthread_mutex_unlock(_mutex); | |
5391 assert (status == 0, "invariant") ; | |
5392 } | |
5393 } | |
5394 | |
5395 | |
5396 extern char** environ; | |
5397 | |
5398 #ifndef __NR_fork | |
5399 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
5400 #endif | |
5401 | |
5402 #ifndef __NR_execve | |
5403 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
5404 #endif | |
5405 | |
5406 // Run the specified command in a separate process. Return its exit value, | |
5407 // or -1 on failure (e.g. can't fork a new process). | |
5408 // Unlike system(), this function can be called from signal handler. It | |
5409 // doesn't block SIGINT et al. | |
5410 int os::fork_and_exec(char* cmd) { | |
199
f139919897d2
6681796: hotspot build failure on gcc 4.2.x (ubuntu 8.04) w/ openjdk 6
xlu
parents:
141
diff
changeset
|
5411 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
0 | 5412 |
5413 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
5414 // pthread_atfork handlers and reset pthread library. All we need is a | |
5415 // separate process to execve. Make a direct syscall to fork process. | |
5416 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
5417 // the best... | |
5418 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
5419 IA64_ONLY(fork();) | |
5420 | |
5421 if (pid < 0) { | |
5422 // fork failed | |
5423 return -1; | |
5424 | |
5425 } else if (pid == 0) { | |
5426 // child process | |
5427 | |
5428 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
5429 // first to kill every thread on the thread list. Because this list is | |
5430 // not reset by fork() (see notes above), execve() will instead kill | |
5431 // every thread in the parent process. We know this is the only thread | |
5432 // in the new process, so make a system call directly. | |
5433 // IA64 should use normal execve() from glibc to match the glibc fork() | |
5434 // above. | |
5435 NOT_IA64(syscall(__NR_execve, "/bin/sh", argv, environ);) | |
199
f139919897d2
6681796: hotspot build failure on gcc 4.2.x (ubuntu 8.04) w/ openjdk 6
xlu
parents:
141
diff
changeset
|
5436 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
0 | 5437 |
5438 // execve failed | |
5439 _exit(-1); | |
5440 | |
5441 } else { | |
5442 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
5443 // care about the actual exit code, for now. | |
5444 | |
5445 int status; | |
5446 | |
5447 // Wait for the child process to exit. This returns immediately if | |
5448 // the child has already exited. */ | |
5449 while (waitpid(pid, &status, 0) < 0) { | |
5450 switch (errno) { | |
5451 case ECHILD: return 0; | |
5452 case EINTR: break; | |
5453 default: return -1; | |
5454 } | |
5455 } | |
5456 | |
5457 if (WIFEXITED(status)) { | |
5458 // The child exited normally; get its exit code. | |
5459 return WEXITSTATUS(status); | |
5460 } else if (WIFSIGNALED(status)) { | |
5461 // The child exited because of a signal | |
5462 // The best value to return is 0x80 + signal number, | |
5463 // because that is what all Unix shells do, and because | |
5464 // it allows callers to distinguish between process exit and | |
5465 // process death by signal. | |
5466 return 0x80 + WTERMSIG(status); | |
5467 } else { | |
5468 // Unknown exit code; pass it through | |
5469 return status; | |
5470 } | |
5471 } | |
5472 } | |
1681
126ea7725993
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bobv
parents:
1642
diff
changeset
|
5473 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5474 // is_headless_jre() |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5475 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5476 // 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
|
5477 // 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
|
5478 // |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5479 // 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
|
5480 // 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
|
5481 // |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5482 bool os::is_headless_jre() { |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5483 struct stat statbuf; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5484 char buf[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5485 char libmawtpath[MAXPATHLEN]; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5486 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
|
5487 const char *new_xawtstr = "/libawt_xawt.so"; |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5488 char *p; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5489 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5490 // Get path to libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5491 os::jvm_path(buf, sizeof(buf)); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5492 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5493 // Get rid of libjvm.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5494 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5495 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5496 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5497 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5498 // Get rid of client or server |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5499 p = strrchr(buf, '/'); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5500 if (p == NULL) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5501 else *p = '\0'; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5502 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5503 // check xawt/libmawt.so |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5504 strcpy(libmawtpath, buf); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5505 strcat(libmawtpath, xawtstr); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5506 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5507 |
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
5508 // check libawt_xawt.so |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5509 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
|
5510 strcat(libmawtpath, new_xawtstr); |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5511 if (::stat(libmawtpath, &statbuf) == 0) return false; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5512 |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5513 return true; |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5514 } |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5515 |
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5516 // Get the default path to the core file |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5517 // Returns the length of the string |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5518 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
|
5519 const char* p = get_current_directory(buffer, bufferSize); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5520 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5521 if (p == NULL) { |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5522 assert(p != NULL, "failed to get current directory"); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5523 return 0; |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5524 } |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5525 |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5526 return strlen(buffer); |
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
5527 } |
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5528 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5529 #ifdef JAVASE_EMBEDDED |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5530 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5531 // 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
|
5532 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5533 MemNotifyThread* MemNotifyThread::_memnotify_thread = NULL; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5534 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5535 // ctor |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5536 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5537 MemNotifyThread::MemNotifyThread(int fd): Thread() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5538 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
|
5539 _fd = fd; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5540 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5541 if (os::create_thread(this, os::os_thread)) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5542 _memnotify_thread = this; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5543 os::set_priority(this, NearMaxPriority); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5544 os::start_thread(this); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5545 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5546 } |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5547 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5548 // Where all the work gets done |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5549 // |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5550 void MemNotifyThread::run() { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5551 assert(this == memnotify_thread(), "expected the singleton MemNotifyThread"); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5552 |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5553 // Set up the select arguments |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5554 fd_set rfds; |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5555 if (_fd != -1) { |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5556 FD_ZERO(&rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5557 FD_SET(_fd, &rfds); |
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
5558 } |
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5559 |
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5560 // Now wait for the mem_notify device to wake up |
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5561 while (1) { |
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5562 // Wait for the mem_notify device to signal us.. |
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5563 int rc = select(_fd+1, _fd != -1 ? &rfds : NULL, NULL, NULL, NULL); |
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5564 if (rc == -1) { |
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5565 perror("select!\n"); |
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5566 break; |
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5567 } else if (rc) { |
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5568 //ssize_t free_before = os::available_memory(); |
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5569 //tty->print ("Notified: Free: %dK \n",os::available_memory()/1024); |
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5570 |
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5571 // The kernel is telling us there is not much memory left... |
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5572 // try to do something about that |
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5573 |
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5574 // If we are not already in a GC, try one. |
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5575 if (!Universe::heap()->is_gc_active()) { |
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5576 Universe::heap()->collect(GCCause::_allocation_failure); |
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5577 |
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5578 //ssize_t free_after = os::available_memory(); |
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5579 //tty->print ("Post-Notify: Free: %dK\n",free_after/1024); |
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5580 //tty->print ("GC freed: %dK\n", (free_after - free_before)/1024); |
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5581 } |
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5582 // We might want to do something like the following if we find the GC's are not helping... |
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5583 // Universe::heap()->size_policy()->set_gc_time_limit_exceeded(true); |
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5584 } |
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5585 } |
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5586 } |
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5587 |
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5588 // |
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5589 // See if the /dev/mem_notify device exists, and if so, start a thread to monitor it. |
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5590 // |
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5591 void MemNotifyThread::start() { |
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5592 int fd; |
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5593 fd = open ("/dev/mem_notify", O_RDONLY, 0); |
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5594 if (fd < 0) { |
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5595 return; |
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|
5596 } |
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5597 |
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5598 if (memnotify_thread() == NULL) { |
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5599 new MemNotifyThread(fd); |
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5600 } |
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5601 } |
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5602 #endif // JAVASE_EMBEDDED |