Mercurial > hg > graal-jvmci-8
annotate src/os/linux/vm/os_linux.cpp @ 22883:8461d0b03127
8043770: File leak in MemNotifyThread::start() in hotspot.src.os.linux.vm.os_linux.cpp
Summary: Fixed by removing all code related to LowMemoryProtection, which removed offending code.
Reviewed-by: dholmes, minqi
| author | cjplummer |
|---|---|
| date | Thu, 12 Mar 2015 22:03:16 -0400 |
| parents | ddce0b7cee93 |
| children | 915ca3e9d15e |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 // no precompiled headers |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "code/vtableStubs.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
| 1972 | 33 #include "interpreter/interpreter.hpp" |
| 34 #include "jvm_linux.h" | |
| 35 #include "memory/allocation.inline.hpp" | |
| 36 #include "memory/filemap.hpp" | |
| 37 #include "mutex_linux.inline.hpp" | |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "os_share_linux.hpp" | |
| 40 #include "prims/jniFastGetField.hpp" | |
| 41 #include "prims/jvm.h" | |
| 42 #include "prims/jvm_misc.hpp" | |
| 43 #include "runtime/arguments.hpp" | |
| 44 #include "runtime/extendedPC.hpp" | |
| 45 #include "runtime/globals.hpp" | |
| 46 #include "runtime/interfaceSupport.hpp" | |
|
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47 #include "runtime/init.hpp" |
| 1972 | 48 #include "runtime/java.hpp" |
| 49 #include "runtime/javaCalls.hpp" | |
| 50 #include "runtime/mutexLocker.hpp" | |
| 51 #include "runtime/objectMonitor.hpp" | |
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52 #include "runtime/orderAccess.inline.hpp" |
| 1972 | 53 #include "runtime/osThread.hpp" |
| 54 #include "runtime/perfMemory.hpp" | |
| 55 #include "runtime/sharedRuntime.hpp" | |
| 56 #include "runtime/statSampler.hpp" | |
| 57 #include "runtime/stubRoutines.hpp" | |
|
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58 #include "runtime/thread.inline.hpp" |
| 1972 | 59 #include "runtime/threadCritical.hpp" |
| 60 #include "runtime/timer.hpp" | |
| 61 #include "services/attachListener.hpp" | |
|
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62 #include "services/memTracker.hpp" |
| 1972 | 63 #include "services/runtimeService.hpp" |
|
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64 #include "utilities/decoder.hpp" |
| 1972 | 65 #include "utilities/defaultStream.hpp" |
| 66 #include "utilities/events.hpp" | |
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67 #include "utilities/elfFile.hpp" |
| 1972 | 68 #include "utilities/growableArray.hpp" |
| 69 #include "utilities/vmError.hpp" | |
| 0 | 70 |
| 71 // put OS-includes here | |
| 72 # include <sys/types.h> | |
| 73 # include <sys/mman.h> | |
|
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74 # include <sys/stat.h> |
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75 # include <sys/select.h> |
| 0 | 76 # include <pthread.h> |
| 77 # include <signal.h> | |
| 78 # include <errno.h> | |
| 79 # include <dlfcn.h> | |
| 80 # include <stdio.h> | |
| 81 # include <unistd.h> | |
| 82 # include <sys/resource.h> | |
| 83 # include <pthread.h> | |
| 84 # include <sys/stat.h> | |
| 85 # include <sys/time.h> | |
| 86 # include <sys/times.h> | |
| 87 # include <sys/utsname.h> | |
| 88 # include <sys/socket.h> | |
| 89 # include <sys/wait.h> | |
| 90 # include <pwd.h> | |
| 91 # include <poll.h> | |
| 92 # include <semaphore.h> | |
| 93 # include <fcntl.h> | |
| 94 # include <string.h> | |
| 95 # include <syscall.h> | |
| 96 # include <sys/sysinfo.h> | |
| 97 # include <gnu/libc-version.h> | |
| 98 # include <sys/ipc.h> | |
| 99 # include <sys/shm.h> | |
| 100 # include <link.h> | |
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101 # include <stdint.h> |
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102 # include <inttypes.h> |
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103 # include <sys/ioctl.h> |
| 0 | 104 |
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105 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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106 |
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107 // if RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling |
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108 // getrusage() is prepared to handle the associated failure. |
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109 #ifndef RUSAGE_THREAD |
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110 #define RUSAGE_THREAD (1) /* only the calling thread */ |
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111 #endif |
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112 |
| 0 | 113 #define MAX_PATH (2 * K) |
| 114 | |
| 17738 | 115 #define MAX_SECS 100000000 |
| 116 | |
| 0 | 117 // for timer info max values which include all bits |
| 118 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 119 | |
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120 #define LARGEPAGES_BIT (1 << 6) |
| 0 | 121 //////////////////////////////////////////////////////////////////////////////// |
| 122 // global variables | |
| 123 julong os::Linux::_physical_memory = 0; | |
| 124 | |
| 125 address os::Linux::_initial_thread_stack_bottom = NULL; | |
| 126 uintptr_t os::Linux::_initial_thread_stack_size = 0; | |
| 127 | |
| 128 int (*os::Linux::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 129 int (*os::Linux::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
| 130 Mutex* os::Linux::_createThread_lock = NULL; | |
| 131 pthread_t os::Linux::_main_thread; | |
| 132 int os::Linux::_page_size = -1; | |
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133 const int os::Linux::_vm_default_page_size = (8 * K); |
| 0 | 134 bool os::Linux::_is_floating_stack = false; |
| 135 bool os::Linux::_is_NPTL = false; | |
| 136 bool os::Linux::_supports_fast_thread_cpu_time = false; | |
|
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137 const char * os::Linux::_glibc_version = NULL; |
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138 const char * os::Linux::_libpthread_version = NULL; |
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139 pthread_condattr_t os::Linux::_condattr[1]; |
| 0 | 140 |
| 141 static jlong initial_time_count=0; | |
| 142 | |
| 143 static int clock_tics_per_sec = 100; | |
| 144 | |
| 145 // For diagnostics to print a message once. see run_periodic_checks | |
| 146 static sigset_t check_signal_done; | |
| 14391 | 147 static bool check_signals = true; |
| 0 | 148 |
| 149 static pid_t _initial_pid = 0; | |
| 150 | |
| 151 /* Signal number used to suspend/resume a thread */ | |
| 152 | |
| 153 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
| 154 static int SR_signum = SIGUSR2; | |
| 155 sigset_t SR_sigset; | |
| 156 | |
| 242 | 157 /* Used to protect dlsym() calls */ |
| 158 static pthread_mutex_t dl_mutex; | |
| 159 | |
| 10405 | 160 // Declarations |
| 161 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); | |
| 162 | |
| 0 | 163 // utility functions |
| 164 | |
| 165 static int SR_initialize(); | |
| 166 | |
| 167 julong os::available_memory() { | |
| 168 return Linux::available_memory(); | |
| 169 } | |
| 170 | |
| 171 julong os::Linux::available_memory() { | |
| 172 // values in struct sysinfo are "unsigned long" | |
| 173 struct sysinfo si; | |
| 174 sysinfo(&si); | |
| 175 | |
| 176 return (julong)si.freeram * si.mem_unit; | |
| 177 } | |
| 178 | |
| 179 julong os::physical_memory() { | |
| 180 return Linux::physical_memory(); | |
| 181 } | |
| 182 | |
| 183 //////////////////////////////////////////////////////////////////////////////// | |
| 184 // environment support | |
| 185 | |
| 186 bool os::getenv(const char* name, char* buf, int len) { | |
| 187 const char* val = ::getenv(name); | |
| 188 if (val != NULL && strlen(val) < (size_t)len) { | |
| 189 strcpy(buf, val); | |
| 190 return true; | |
| 191 } | |
| 192 if (len > 0) buf[0] = 0; // return a null string | |
| 193 return false; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 // Return true if user is running as root. | |
| 198 | |
| 199 bool os::have_special_privileges() { | |
| 200 static bool init = false; | |
| 201 static bool privileges = false; | |
| 202 if (!init) { | |
| 203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 204 init = true; | |
| 205 } | |
| 206 return privileges; | |
| 207 } | |
| 208 | |
| 209 | |
| 210 #ifndef SYS_gettid | |
| 211 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
| 212 #ifdef __ia64__ | |
| 213 #define SYS_gettid 1105 | |
| 214 #elif __i386__ | |
| 215 #define SYS_gettid 224 | |
| 216 #elif __amd64__ | |
| 217 #define SYS_gettid 186 | |
| 218 #elif __sparc__ | |
| 219 #define SYS_gettid 143 | |
| 220 #else | |
| 221 #error define gettid for the arch | |
| 222 #endif | |
| 223 #endif | |
| 224 | |
| 225 // Cpu architecture string | |
|
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226 static char cpu_arch[] = HOTSPOT_LIB_ARCH; |
| 0 | 227 |
| 228 // pid_t gettid() | |
| 229 // | |
| 230 // Returns the kernel thread id of the currently running thread. Kernel | |
| 231 // thread id is used to access /proc. | |
| 232 // | |
| 233 // (Note that getpid() on LinuxThreads returns kernel thread id too; but | |
| 234 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
| 235 // | |
| 236 pid_t os::Linux::gettid() { | |
| 237 int rslt = syscall(SYS_gettid); | |
| 238 if (rslt == -1) { | |
| 239 // old kernel, no NPTL support | |
| 240 return getpid(); | |
| 241 } else { | |
| 242 return (pid_t)rslt; | |
| 243 } | |
| 244 } | |
| 245 | |
| 246 // Most versions of linux have a bug where the number of processors are | |
| 247 // determined by looking at the /proc file system. In a chroot environment, | |
| 248 // the system call returns 1. This causes the VM to act as if it is | |
| 249 // a single processor and elide locking (see is_MP() call). | |
| 250 static bool unsafe_chroot_detected = false; | |
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251 static const char *unstable_chroot_error = "/proc file system not found.\n" |
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252 "Java may be unstable running multithreaded in a chroot " |
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253 "environment on Linux when /proc filesystem is not mounted."; |
| 0 | 254 |
| 255 void os::Linux::initialize_system_info() { | |
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256 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); |
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257 if (processor_count() == 1) { |
| 0 | 258 pid_t pid = os::Linux::gettid(); |
| 259 char fname[32]; | |
| 260 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
| 261 FILE *fp = fopen(fname, "r"); | |
| 262 if (fp == NULL) { | |
| 263 unsafe_chroot_detected = true; | |
| 264 } else { | |
| 265 fclose(fp); | |
| 266 } | |
| 267 } | |
| 268 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
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269 assert(processor_count() > 0, "linux error"); |
| 0 | 270 } |
| 271 | |
| 272 void os::init_system_properties_values() { | |
| 273 // The next steps are taken in the product version: | |
| 274 // | |
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275 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 0 | 276 // This library should be located at: |
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277 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 0 | 278 // |
| 279 // If "/jre/lib/" appears at the right place in the path, then we | |
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280 // assume libjvm.so is installed in a JDK and we use this path. |
| 0 | 281 // |
| 282 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 283 // | |
| 284 // The following extra steps are taken in the debugging version: | |
| 285 // | |
| 286 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 287 // instead of exit check for $JAVA_HOME environment variable. | |
| 288 // | |
| 289 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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290 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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291 // it looks like libjvm.so is installed there |
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292 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 0 | 293 // |
| 294 // Otherwise exit. | |
| 295 // | |
| 296 // Important note: if the location of libjvm.so changes this | |
| 297 // code needs to be changed accordingly. | |
| 298 | |
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299 // See ld(1): |
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300 // The linker uses the following search paths to locate required |
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301 // shared libraries: |
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302 // 1: ... |
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303 // ... |
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304 // 7: The default directories, normally /lib and /usr/lib. |
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305 #if defined(AMD64) || defined(_LP64) && (defined(SPARC) || defined(PPC) || defined(S390)) |
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306 #define DEFAULT_LIBPATH "/usr/lib64:/lib64:/lib:/usr/lib" |
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307 #else |
| 0 | 308 #define DEFAULT_LIBPATH "/lib:/usr/lib" |
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309 #endif |
| 0 | 310 |
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311 // Base path of extensions installed on the system. |
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312 #define SYS_EXT_DIR "/usr/java/packages" |
| 0 | 313 #define EXTENSIONS_DIR "/lib/ext" |
| 314 #define ENDORSED_DIR "/lib/endorsed" | |
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315 |
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316 // Buffer that fits several sprintfs. |
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317 // Note that the space for the colon and the trailing null are provided |
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318 // by the nulls included by the sizeof operator. |
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319 const size_t bufsize = |
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320 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
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321 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir |
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322 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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323 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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324 |
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325 // sysclasspath, java_home, dll_dir |
| 0 | 326 { |
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327 char *pslash; |
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328 os::jvm_path(buf, bufsize); |
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329 |
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330 // Found the full path to libjvm.so. |
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331 // Now cut the path to <java_home>/jre if we can. |
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332 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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333 pslash = strrchr(buf, '/'); |
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334 if (pslash != NULL) { |
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335 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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336 } |
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337 Arguments::set_dll_dir(buf); |
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338 |
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339 if (pslash != NULL) { |
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340 pslash = strrchr(buf, '/'); |
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341 if (pslash != NULL) { |
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342 *pslash = '\0'; // Get rid of /<arch>. |
| 0 | 343 pslash = strrchr(buf, '/'); |
| 344 if (pslash != NULL) { | |
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345 *pslash = '\0'; // Get rid of /lib. |
| 0 | 346 } |
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347 } |
| 0 | 348 } |
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349 Arguments::set_java_home(buf); |
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350 set_boot_path('/', ':'); |
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351 } |
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352 |
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353 // Where to look for native libraries. |
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354 // |
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355 // Note: Due to a legacy implementation, most of the library path |
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356 // is set in the launcher. This was to accomodate linking restrictions |
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357 // on legacy Linux implementations (which are no longer supported). |
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358 // Eventually, all the library path setting will be done here. |
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359 // |
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360 // However, to prevent the proliferation of improperly built native |
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361 // libraries, the new path component /usr/java/packages is added here. |
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362 // Eventually, all the library path setting will be done here. |
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363 { |
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364 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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365 // should always exist (until the legacy problem cited above is |
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366 // addressed). |
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367 const char *v = ::getenv("LD_LIBRARY_PATH"); |
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368 const char *v_colon = ":"; |
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369 if (v == NULL) { v = ""; v_colon = ""; } |
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370 // That's +1 for the colon and +1 for the trailing '\0'. |
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371 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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372 strlen(v) + 1 + |
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373 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
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374 mtInternal); |
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375 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
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376 Arguments::set_library_path(ld_library_path); |
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377 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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378 } |
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379 |
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380 // Extensions directories. |
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381 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
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382 Arguments::set_ext_dirs(buf); |
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383 |
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384 // Endorsed standards default directory. |
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385 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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386 Arguments::set_endorsed_dirs(buf); |
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387 |
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388 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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389 |
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390 #undef DEFAULT_LIBPATH |
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391 #undef SYS_EXT_DIR |
| 0 | 392 #undef EXTENSIONS_DIR |
| 393 #undef ENDORSED_DIR | |
| 394 } | |
| 395 | |
| 396 //////////////////////////////////////////////////////////////////////////////// | |
| 397 // breakpoint support | |
| 398 | |
| 399 void os::breakpoint() { | |
| 400 BREAKPOINT; | |
| 401 } | |
| 402 | |
| 403 extern "C" void breakpoint() { | |
| 404 // use debugger to set breakpoint here | |
| 405 } | |
| 406 | |
| 407 //////////////////////////////////////////////////////////////////////////////// | |
| 408 // signal support | |
| 409 | |
| 410 debug_only(static bool signal_sets_initialized = false); | |
| 411 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 412 | |
| 413 bool os::Linux::is_sig_ignored(int sig) { | |
| 414 struct sigaction oact; | |
| 415 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 416 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 417 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 418 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 419 return true; | |
| 420 else | |
| 421 return false; | |
| 422 } | |
| 423 | |
| 424 void os::Linux::signal_sets_init() { | |
| 425 // Should also have an assertion stating we are still single-threaded. | |
| 426 assert(!signal_sets_initialized, "Already initialized"); | |
| 427 // Fill in signals that are necessarily unblocked for all threads in | |
| 428 // the VM. Currently, we unblock the following signals: | |
| 429 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 430 // by -Xrs (=ReduceSignalUsage)); | |
| 431 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 432 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 433 // the dispositions or masks wrt these signals. | |
| 434 // Programs embedding the VM that want to use the above signals for their | |
| 435 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 436 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 437 // (See bug 4345157, and other related bugs). | |
| 438 // In reality, though, unblocking these signals is really a nop, since | |
| 439 // these signals are not blocked by default. | |
| 440 sigemptyset(&unblocked_sigs); | |
| 441 sigemptyset(&allowdebug_blocked_sigs); | |
| 442 sigaddset(&unblocked_sigs, SIGILL); | |
| 443 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 444 sigaddset(&unblocked_sigs, SIGBUS); | |
| 445 sigaddset(&unblocked_sigs, SIGFPE); | |
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446 #if defined(PPC64) |
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447 sigaddset(&unblocked_sigs, SIGTRAP); |
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448 #endif |
| 0 | 449 sigaddset(&unblocked_sigs, SR_signum); |
| 450 | |
| 451 if (!ReduceSignalUsage) { | |
| 452 if (!os::Linux::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 453 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 454 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 455 } | |
| 456 if (!os::Linux::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 457 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 458 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 459 } | |
| 460 if (!os::Linux::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 461 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 462 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 463 } | |
| 464 } | |
| 465 // Fill in signals that are blocked by all but the VM thread. | |
| 466 sigemptyset(&vm_sigs); | |
| 467 if (!ReduceSignalUsage) | |
| 468 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 469 debug_only(signal_sets_initialized = true); | |
| 470 | |
| 471 } | |
| 472 | |
| 473 // These are signals that are unblocked while a thread is running Java. | |
| 474 // (For some reason, they get blocked by default.) | |
| 475 sigset_t* os::Linux::unblocked_signals() { | |
| 476 assert(signal_sets_initialized, "Not initialized"); | |
| 477 return &unblocked_sigs; | |
| 478 } | |
| 479 | |
| 480 // These are the signals that are blocked while a (non-VM) thread is | |
| 481 // running Java. Only the VM thread handles these signals. | |
| 482 sigset_t* os::Linux::vm_signals() { | |
| 483 assert(signal_sets_initialized, "Not initialized"); | |
| 484 return &vm_sigs; | |
| 485 } | |
| 486 | |
| 487 // These are signals that are blocked during cond_wait to allow debugger in | |
| 488 sigset_t* os::Linux::allowdebug_blocked_signals() { | |
| 489 assert(signal_sets_initialized, "Not initialized"); | |
| 490 return &allowdebug_blocked_sigs; | |
| 491 } | |
| 492 | |
| 493 void os::Linux::hotspot_sigmask(Thread* thread) { | |
| 494 | |
| 495 //Save caller's signal mask before setting VM signal mask | |
| 496 sigset_t caller_sigmask; | |
| 497 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 498 | |
| 499 OSThread* osthread = thread->osthread(); | |
| 500 osthread->set_caller_sigmask(caller_sigmask); | |
| 501 | |
| 502 pthread_sigmask(SIG_UNBLOCK, os::Linux::unblocked_signals(), NULL); | |
| 503 | |
| 504 if (!ReduceSignalUsage) { | |
| 505 if (thread->is_VM_thread()) { | |
| 506 // Only the VM thread handles BREAK_SIGNAL ... | |
| 507 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 508 } else { | |
| 509 // ... all other threads block BREAK_SIGNAL | |
| 510 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 511 } | |
| 512 } | |
| 513 } | |
| 514 | |
| 515 ////////////////////////////////////////////////////////////////////////////// | |
| 516 // detecting pthread library | |
| 517 | |
| 518 void os::Linux::libpthread_init() { | |
| 519 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
| 520 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
| 521 // generic name for earlier versions. | |
| 522 // Define macros here so we can build HotSpot on old systems. | |
| 523 # ifndef _CS_GNU_LIBC_VERSION | |
| 524 # define _CS_GNU_LIBC_VERSION 2 | |
| 525 # endif | |
| 526 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
| 527 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
| 528 # endif | |
| 529 | |
| 530 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
| 531 if (n > 0) { | |
| 6197 | 532 char *str = (char *)malloc(n, mtInternal); |
| 0 | 533 confstr(_CS_GNU_LIBC_VERSION, str, n); |
| 534 os::Linux::set_glibc_version(str); | |
| 535 } else { | |
| 536 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
| 537 static char _gnu_libc_version[32]; | |
| 538 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
| 539 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
| 540 os::Linux::set_glibc_version(_gnu_libc_version); | |
| 541 } | |
| 542 | |
| 543 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
| 544 if (n > 0) { | |
| 6197 | 545 char *str = (char *)malloc(n, mtInternal); |
| 0 | 546 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); |
| 547 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
| 548 // us "NPTL-0.29" even we are running with LinuxThreads. Check if this | |
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549 // is the case. LinuxThreads has a hard limit on max number of threads. |
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550 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. |
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551 // On the other hand, NPTL does not have such a limit, sysconf() |
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552 // will return -1 and errno is not changed. Check if it is really NPTL. |
| 0 | 553 if (strcmp(os::Linux::glibc_version(), "glibc 2.3.2") == 0 && |
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554 strstr(str, "NPTL") && |
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555 sysconf(_SC_THREAD_THREADS_MAX) > 0) { |
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556 free(str); |
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557 os::Linux::set_libpthread_version("linuxthreads"); |
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558 } else { |
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559 os::Linux::set_libpthread_version(str); |
| 0 | 560 } |
| 561 } else { | |
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562 // glibc before 2.3.2 only has LinuxThreads. |
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563 os::Linux::set_libpthread_version("linuxthreads"); |
| 0 | 564 } |
| 565 | |
| 566 if (strstr(libpthread_version(), "NPTL")) { | |
| 567 os::Linux::set_is_NPTL(); | |
| 568 } else { | |
| 569 os::Linux::set_is_LinuxThreads(); | |
| 570 } | |
| 571 | |
| 572 // LinuxThreads have two flavors: floating-stack mode, which allows variable | |
| 573 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
| 574 if (os::Linux::is_NPTL() || os::Linux::supports_variable_stack_size()) { | |
| 575 os::Linux::set_is_floating_stack(); | |
| 576 } | |
| 577 } | |
| 578 | |
| 579 ///////////////////////////////////////////////////////////////////////////// | |
| 580 // thread stack | |
| 581 | |
| 582 // Force Linux kernel to expand current thread stack. If "bottom" is close | |
| 583 // to the stack guard, caller should block all signals. | |
| 584 // | |
| 585 // MAP_GROWSDOWN: | |
| 586 // A special mmap() flag that is used to implement thread stacks. It tells | |
| 587 // kernel that the memory region should extend downwards when needed. This | |
| 588 // allows early versions of LinuxThreads to only mmap the first few pages | |
| 589 // when creating a new thread. Linux kernel will automatically expand thread | |
| 590 // stack as needed (on page faults). | |
| 591 // | |
| 592 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
| 593 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
| 594 // region, it's hard to tell if the fault is due to a legitimate stack | |
| 595 // access or because of reading/writing non-exist memory (e.g. buffer | |
| 596 // overrun). As a rule, if the fault happens below current stack pointer, | |
| 597 // Linux kernel does not expand stack, instead a SIGSEGV is sent to the | |
| 598 // application (see Linux kernel fault.c). | |
| 599 // | |
| 600 // This Linux feature can cause SIGSEGV when VM bangs thread stack for | |
| 601 // stack overflow detection. | |
| 602 // | |
| 603 // Newer version of LinuxThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
| 604 // not use this flag. However, the stack of initial thread is not created | |
| 605 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
| 606 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
| 607 // and then attach the thread to JVM. | |
| 608 // | |
| 609 // To get around the problem and allow stack banging on Linux, we need to | |
| 610 // manually expand thread stack after receiving the SIGSEGV. | |
| 611 // | |
| 612 // There are two ways to expand thread stack to address "bottom", we used | |
| 613 // both of them in JVM before 1.5: | |
| 614 // 1. adjust stack pointer first so that it is below "bottom", and then | |
| 615 // touch "bottom" | |
| 616 // 2. mmap() the page in question | |
| 617 // | |
| 618 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
| 619 // if current sp is already near the lower end of page 101, and we need to | |
| 620 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
| 621 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
| 622 // That will destroy the mmap() frame and cause VM to crash. | |
| 623 // | |
| 624 // The following code works by adjusting sp first, then accessing the "bottom" | |
| 625 // page to force a page fault. Linux kernel will then automatically expand the | |
| 626 // stack mapping. | |
| 627 // | |
| 628 // _expand_stack_to() assumes its frame size is less than page size, which | |
| 629 // should always be true if the function is not inlined. | |
| 630 | |
| 631 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
| 632 #define NOINLINE | |
| 633 #else | |
| 634 #define NOINLINE __attribute__ ((noinline)) | |
| 635 #endif | |
| 636 | |
| 637 static void _expand_stack_to(address bottom) NOINLINE; | |
| 638 | |
| 639 static void _expand_stack_to(address bottom) { | |
| 640 address sp; | |
| 641 size_t size; | |
| 642 volatile char *p; | |
| 643 | |
| 644 // Adjust bottom to point to the largest address within the same page, it | |
| 645 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
| 646 bottom = (address)align_size_down((uintptr_t)bottom, os::Linux::page_size()); | |
| 647 bottom += os::Linux::page_size() - 1; | |
| 648 | |
| 649 // sp might be slightly above current stack pointer; if that's the case, we | |
| 650 // will alloca() a little more space than necessary, which is OK. Don't use | |
| 651 // os::current_stack_pointer(), as its result can be slightly below current | |
| 652 // stack pointer, causing us to not alloca enough to reach "bottom". | |
| 653 sp = (address)&sp; | |
| 654 | |
| 655 if (sp > bottom) { | |
| 656 size = sp - bottom; | |
| 657 p = (volatile char *)alloca(size); | |
| 658 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
| 659 p[0] = '\0'; | |
| 660 } | |
| 661 } | |
| 662 | |
| 663 bool os::Linux::manually_expand_stack(JavaThread * t, address addr) { | |
| 664 assert(t!=NULL, "just checking"); | |
| 665 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
| 666 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
| 667 | |
| 668 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
| 669 sigset_t mask_all, old_sigset; | |
| 670 sigfillset(&mask_all); | |
| 671 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
| 672 _expand_stack_to(addr); | |
| 673 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
| 674 return true; | |
| 675 } | |
| 676 return false; | |
| 677 } | |
| 678 | |
| 679 ////////////////////////////////////////////////////////////////////////////// | |
| 680 // create new thread | |
| 681 | |
| 682 static address highest_vm_reserved_address(); | |
| 683 | |
| 684 // check if it's safe to start a new thread | |
| 685 static bool _thread_safety_check(Thread* thread) { | |
| 686 if (os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack()) { | |
| 687 // Fixed stack LinuxThreads (SuSE Linux/x86, and some versions of Redhat) | |
| 688 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
| 689 // allocated (MAP_FIXED) from high address space. Every thread stack | |
| 690 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
| 691 // it to other values if they rebuild LinuxThreads). | |
| 692 // | |
| 693 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
| 694 // the memory region has already been mmap'ed. That means if we have too | |
| 695 // many threads and/or very large heap, eventually thread stack will | |
| 696 // collide with heap. | |
| 697 // | |
| 698 // Here we try to prevent heap/stack collision by comparing current | |
| 699 // stack bottom with the highest address that has been mmap'ed by JVM | |
| 700 // plus a safety margin for memory maps created by native code. | |
| 701 // | |
| 702 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
| 703 // | |
| 704 if (ThreadSafetyMargin > 0) { | |
| 705 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
| 706 | |
| 707 // not safe if our stack extends below the safety margin | |
| 708 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
| 709 } else { | |
| 710 return true; | |
| 711 } | |
| 712 } else { | |
| 713 // Floating stack LinuxThreads or NPTL: | |
| 714 // Unlike fixed stack LinuxThreads, thread stacks are not MAP_FIXED. When | |
| 715 // there's not enough space left, pthread_create() will fail. If we come | |
| 716 // here, that means enough space has been reserved for stack. | |
| 717 return true; | |
| 718 } | |
| 719 } | |
| 720 | |
| 721 // Thread start routine for all newly created threads | |
| 722 static void *java_start(Thread *thread) { | |
| 723 // Try to randomize the cache line index of hot stack frames. | |
| 724 // This helps when threads of the same stack traces evict each other's | |
| 725 // cache lines. The threads can be either from the same JVM instance, or | |
| 726 // from different JVM instances. The benefit is especially true for | |
| 727 // processors with hyperthreading technology. | |
| 728 static int counter = 0; | |
| 729 int pid = os::current_process_id(); | |
| 730 alloca(((pid ^ counter++) & 7) * 128); | |
| 731 | |
| 732 ThreadLocalStorage::set_thread(thread); | |
| 733 | |
| 734 OSThread* osthread = thread->osthread(); | |
| 735 Monitor* sync = osthread->startThread_lock(); | |
| 736 | |
| 737 // non floating stack LinuxThreads needs extra check, see above | |
| 738 if (!_thread_safety_check(thread)) { | |
| 739 // notify parent thread | |
| 740 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 741 osthread->set_state(ZOMBIE); | |
| 742 sync->notify_all(); | |
| 743 return NULL; | |
| 744 } | |
| 745 | |
| 746 // thread_id is kernel thread id (similar to Solaris LWP id) | |
| 747 osthread->set_thread_id(os::Linux::gettid()); | |
| 748 | |
| 749 if (UseNUMA) { | |
| 750 int lgrp_id = os::numa_get_group_id(); | |
| 751 if (lgrp_id != -1) { | |
| 752 thread->set_lgrp_id(lgrp_id); | |
| 753 } | |
| 754 } | |
| 755 // initialize signal mask for this thread | |
| 756 os::Linux::hotspot_sigmask(thread); | |
| 757 | |
| 758 // initialize floating point control register | |
| 759 os::Linux::init_thread_fpu_state(); | |
| 760 | |
| 761 // handshaking with parent thread | |
| 762 { | |
| 763 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 764 | |
| 765 // notify parent thread | |
| 766 osthread->set_state(INITIALIZED); | |
| 767 sync->notify_all(); | |
| 768 | |
| 769 // wait until os::start_thread() | |
| 770 while (osthread->get_state() == INITIALIZED) { | |
| 771 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 772 } | |
| 773 } | |
| 774 | |
| 775 // call one more level start routine | |
| 776 thread->run(); | |
| 777 | |
| 778 return 0; | |
| 779 } | |
| 780 | |
| 781 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 782 assert(thread->osthread() == NULL, "caller responsible"); | |
| 783 | |
| 784 // Allocate the OSThread object | |
| 785 OSThread* osthread = new OSThread(NULL, NULL); | |
| 786 if (osthread == NULL) { | |
| 787 return false; | |
| 788 } | |
| 789 | |
| 790 // set the correct thread state | |
| 791 osthread->set_thread_type(thr_type); | |
| 792 | |
| 793 // Initial state is ALLOCATED but not INITIALIZED | |
| 794 osthread->set_state(ALLOCATED); | |
| 795 | |
| 796 thread->set_osthread(osthread); | |
| 797 | |
| 798 // init thread attributes | |
| 799 pthread_attr_t attr; | |
| 800 pthread_attr_init(&attr); | |
| 801 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 802 | |
| 803 // stack size | |
| 804 if (os::Linux::supports_variable_stack_size()) { | |
| 805 // calculate stack size if it's not specified by caller | |
| 806 if (stack_size == 0) { | |
| 807 stack_size = os::Linux::default_stack_size(thr_type); | |
| 808 | |
| 809 switch (thr_type) { | |
| 810 case os::java_thread: | |
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812 // changed with the flag -Xss |
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813 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); |
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814 stack_size = JavaThread::stack_size_at_create(); |
| 0 | 815 break; |
| 816 case os::compiler_thread: | |
| 817 if (CompilerThreadStackSize > 0) { | |
| 818 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 819 break; | |
| 820 } // else fall through: | |
| 821 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 822 case os::vm_thread: | |
| 823 case os::pgc_thread: | |
| 824 case os::cgc_thread: | |
| 825 case os::watcher_thread: | |
| 826 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 827 break; | |
| 828 } | |
| 829 } | |
| 830 | |
| 831 stack_size = MAX2(stack_size, os::Linux::min_stack_allowed); | |
| 832 pthread_attr_setstacksize(&attr, stack_size); | |
| 833 } else { | |
| 834 // let pthread_create() pick the default value. | |
| 835 } | |
| 836 | |
| 837 // glibc guard page | |
| 838 pthread_attr_setguardsize(&attr, os::Linux::default_guard_size(thr_type)); | |
| 839 | |
| 840 ThreadState state; | |
| 841 | |
| 842 { | |
| 843 // Serialize thread creation if we are running with fixed stack LinuxThreads | |
| 844 bool lock = os::Linux::is_LinuxThreads() && !os::Linux::is_floating_stack(); | |
| 845 if (lock) { | |
| 846 os::Linux::createThread_lock()->lock_without_safepoint_check(); | |
| 847 } | |
| 848 | |
| 849 pthread_t tid; | |
| 850 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 851 | |
| 852 pthread_attr_destroy(&attr); | |
| 853 | |
| 854 if (ret != 0) { | |
| 855 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 856 perror("pthread_create()"); | |
| 857 } | |
| 858 // Need to clean up stuff we've allocated so far | |
| 859 thread->set_osthread(NULL); | |
| 860 delete osthread; | |
| 861 if (lock) os::Linux::createThread_lock()->unlock(); | |
| 862 return false; | |
| 863 } | |
| 864 | |
| 865 // Store pthread info into the OSThread | |
| 866 osthread->set_pthread_id(tid); | |
| 867 | |
| 868 // Wait until child thread is either initialized or aborted | |
| 869 { | |
| 870 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 871 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 872 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 873 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 874 } | |
| 875 } | |
| 876 | |
| 877 if (lock) { | |
| 878 os::Linux::createThread_lock()->unlock(); | |
| 879 } | |
| 880 } | |
| 881 | |
| 882 // Aborted due to thread limit being reached | |
| 883 if (state == ZOMBIE) { | |
| 884 thread->set_osthread(NULL); | |
| 885 delete osthread; | |
| 886 return false; | |
| 887 } | |
| 888 | |
| 889 // The thread is returned suspended (in state INITIALIZED), | |
| 890 // and is started higher up in the call chain | |
| 891 assert(state == INITIALIZED, "race condition"); | |
| 892 return true; | |
| 893 } | |
| 894 | |
| 895 ///////////////////////////////////////////////////////////////////////////// | |
| 896 // attach existing thread | |
| 897 | |
| 898 // bootstrap the main thread | |
| 899 bool os::create_main_thread(JavaThread* thread) { | |
| 900 assert(os::Linux::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 901 return create_attached_thread(thread); | |
| 902 } | |
| 903 | |
| 904 bool os::create_attached_thread(JavaThread* thread) { | |
| 905 #ifdef ASSERT | |
| 906 thread->verify_not_published(); | |
| 907 #endif | |
| 908 | |
| 909 // Allocate the OSThread object | |
| 910 OSThread* osthread = new OSThread(NULL, NULL); | |
| 911 | |
| 912 if (osthread == NULL) { | |
| 913 return false; | |
| 914 } | |
| 915 | |
| 916 // Store pthread info into the OSThread | |
| 917 osthread->set_thread_id(os::Linux::gettid()); | |
| 918 osthread->set_pthread_id(::pthread_self()); | |
| 919 | |
| 920 // initialize floating point control register | |
| 921 os::Linux::init_thread_fpu_state(); | |
| 922 | |
| 923 // Initial thread state is RUNNABLE | |
| 924 osthread->set_state(RUNNABLE); | |
| 925 | |
| 926 thread->set_osthread(osthread); | |
| 927 | |
| 928 if (UseNUMA) { | |
| 929 int lgrp_id = os::numa_get_group_id(); | |
| 930 if (lgrp_id != -1) { | |
| 931 thread->set_lgrp_id(lgrp_id); | |
| 932 } | |
| 933 } | |
| 934 | |
| 935 if (os::Linux::is_initial_thread()) { | |
| 936 // If current thread is initial thread, its stack is mapped on demand, | |
| 937 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
| 938 // the entire stack region to avoid SEGV in stack banging. | |
| 939 // It is also useful to get around the heap-stack-gap problem on SuSE | |
| 940 // kernel (see 4821821 for details). We first expand stack to the top | |
| 941 // of yellow zone, then enable stack yellow zone (order is significant, | |
| 942 // enabling yellow zone first will crash JVM on SuSE Linux), so there | |
| 943 // is no gap between the last two virtual memory regions. | |
| 944 | |
| 945 JavaThread *jt = (JavaThread *)thread; | |
| 946 address addr = jt->stack_yellow_zone_base(); | |
| 947 assert(addr != NULL, "initialization problem?"); | |
| 948 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
| 949 | |
| 950 osthread->set_expanding_stack(); | |
| 951 os::Linux::manually_expand_stack(jt, addr); | |
| 952 osthread->clear_expanding_stack(); | |
| 953 } | |
| 954 | |
| 955 // initialize signal mask for this thread | |
| 956 // and save the caller's signal mask | |
| 957 os::Linux::hotspot_sigmask(thread); | |
| 958 | |
| 959 return true; | |
| 960 } | |
| 961 | |
| 962 void os::pd_start_thread(Thread* thread) { | |
| 963 OSThread * osthread = thread->osthread(); | |
| 964 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 965 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 966 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 967 sync_with_child->notify(); | |
| 968 } | |
| 969 | |
| 970 // Free Linux resources related to the OSThread | |
| 971 void os::free_thread(OSThread* osthread) { | |
| 972 assert(osthread != NULL, "osthread not set"); | |
| 973 | |
| 974 if (Thread::current()->osthread() == osthread) { | |
| 975 // Restore caller's signal mask | |
| 976 sigset_t sigmask = osthread->caller_sigmask(); | |
| 977 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 978 } | |
| 979 | |
| 980 delete osthread; | |
| 981 } | |
| 982 | |
| 983 ////////////////////////////////////////////////////////////////////////////// | |
| 984 // thread local storage | |
| 985 | |
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986 // Restore the thread pointer if the destructor is called. This is in case |
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987 // someone from JNI code sets up a destructor with pthread_key_create to run |
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988 // detachCurrentThread on thread death. Unless we restore the thread pointer we |
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989 // will hang or crash. When detachCurrentThread is called the key will be set |
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990 // to null and we will not be called again. If detachCurrentThread is never |
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991 // called we could loop forever depending on the pthread implementation. |
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992 static void restore_thread_pointer(void* p) { |
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993 Thread* thread = (Thread*) p; |
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994 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); |
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995 } |
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996 |
| 0 | 997 int os::allocate_thread_local_storage() { |
| 998 pthread_key_t key; | |
|
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999 int rslt = pthread_key_create(&key, restore_thread_pointer); |
| 0 | 1000 assert(rslt == 0, "cannot allocate thread local storage"); |
| 1001 return (int)key; | |
| 1002 } | |
| 1003 | |
| 1004 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 1005 // on VM exit. | |
| 1006 void os::free_thread_local_storage(int index) { | |
| 1007 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 1008 assert(rslt == 0, "invalid index"); | |
| 1009 } | |
| 1010 | |
| 1011 void os::thread_local_storage_at_put(int index, void* value) { | |
| 1012 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 1013 assert(rslt == 0, "pthread_setspecific failed"); | |
| 1014 } | |
| 1015 | |
| 1016 extern "C" Thread* get_thread() { | |
| 1017 return ThreadLocalStorage::thread(); | |
| 1018 } | |
| 1019 | |
| 1020 ////////////////////////////////////////////////////////////////////////////// | |
| 1021 // initial thread | |
| 1022 | |
| 1023 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
| 1024 bool os::Linux::is_initial_thread(void) { | |
| 1025 char dummy; | |
| 1026 // If called before init complete, thread stack bottom will be null. | |
| 1027 // Can be called if fatal error occurs before initialization. | |
| 1028 if (initial_thread_stack_bottom() == NULL) return false; | |
| 1029 assert(initial_thread_stack_bottom() != NULL && | |
| 1030 initial_thread_stack_size() != 0, | |
| 1031 "os::init did not locate initial thread's stack region"); | |
| 1032 if ((address)&dummy >= initial_thread_stack_bottom() && | |
| 1033 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
| 1034 return true; | |
| 1035 else return false; | |
| 1036 } | |
| 1037 | |
| 1038 // Find the virtual memory area that contains addr | |
| 1039 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
| 1040 FILE *fp = fopen("/proc/self/maps", "r"); | |
| 1041 if (fp) { | |
| 1042 address low, high; | |
| 1043 while (!feof(fp)) { | |
| 1044 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
| 1045 if (low <= addr && addr < high) { | |
| 1046 if (vma_low) *vma_low = low; | |
| 1047 if (vma_high) *vma_high = high; | |
| 1048 fclose (fp); | |
| 1049 return true; | |
| 1050 } | |
| 1051 } | |
| 1052 for (;;) { | |
| 1053 int ch = fgetc(fp); | |
| 1054 if (ch == EOF || ch == (int)'\n') break; | |
| 1055 } | |
| 1056 } | |
| 1057 fclose(fp); | |
| 1058 } | |
| 1059 return false; | |
| 1060 } | |
| 1061 | |
| 1062 // Locate initial thread stack. This special handling of initial thread stack | |
| 1063 // is needed because pthread_getattr_np() on most (all?) Linux distros returns | |
| 1064 // bogus value for initial thread. | |
| 1065 void os::Linux::capture_initial_stack(size_t max_size) { | |
| 1066 // stack size is the easy part, get it from RLIMIT_STACK | |
| 1067 size_t stack_size; | |
| 1068 struct rlimit rlim; | |
| 1069 getrlimit(RLIMIT_STACK, &rlim); | |
| 1070 stack_size = rlim.rlim_cur; | |
| 1071 | |
| 1072 // 6308388: a bug in ld.so will relocate its own .data section to the | |
| 1073 // lower end of primordial stack; reduce ulimit -s value a little bit | |
| 1074 // so we won't install guard page on ld.so's data section. | |
| 1075 stack_size -= 2 * page_size(); | |
| 1076 | |
| 1077 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
| 1078 // 7.1, in both cases we will get 2G in return value. | |
| 1079 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
| 1080 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
| 1081 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
| 1082 // in case other parts in glibc still assumes 2M max stack size. | |
| 1083 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
| 1084 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
| 7994 | 1085 if (stack_size > 2 * K * K IA64_ONLY(*2)) |
| 1086 stack_size = 2 * K * K IA64_ONLY(*2); | |
| 0 | 1087 // Try to figure out where the stack base (top) is. This is harder. |
| 1088 // | |
| 1089 // When an application is started, glibc saves the initial stack pointer in | |
| 1090 // a global variable "__libc_stack_end", which is then used by system | |
| 1091 // libraries. __libc_stack_end should be pretty close to stack top. The | |
| 1092 // variable is available since the very early days. However, because it is | |
| 1093 // a private interface, it could disappear in the future. | |
| 1094 // | |
| 1095 // Linux kernel saves start_stack information in /proc/<pid>/stat. Similar | |
| 1096 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
| 1097 // stack top. Note that /proc may not exist if VM is running as a chroot | |
| 1098 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
| 1099 // /proc/<pid>/stat could change in the future (though unlikely). | |
| 1100 // | |
| 1101 // We try __libc_stack_end first. If that doesn't work, look for | |
| 1102 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
| 1103 // as a hint, which should work well in most cases. | |
| 1104 | |
| 1105 uintptr_t stack_start; | |
| 1106 | |
| 1107 // try __libc_stack_end first | |
| 1108 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
| 1109 if (p && *p) { | |
| 1110 stack_start = *p; | |
| 1111 } else { | |
| 1112 // see if we can get the start_stack field from /proc/self/stat | |
| 1113 FILE *fp; | |
| 1114 int pid; | |
| 1115 char state; | |
| 1116 int ppid; | |
| 1117 int pgrp; | |
| 1118 int session; | |
| 1119 int nr; | |
| 1120 int tpgrp; | |
| 1121 unsigned long flags; | |
| 1122 unsigned long minflt; | |
| 1123 unsigned long cminflt; | |
| 1124 unsigned long majflt; | |
| 1125 unsigned long cmajflt; | |
| 1126 unsigned long utime; | |
| 1127 unsigned long stime; | |
| 1128 long cutime; | |
| 1129 long cstime; | |
| 1130 long prio; | |
| 1131 long nice; | |
| 1132 long junk; | |
| 1133 long it_real; | |
| 1134 uintptr_t start; | |
| 1135 uintptr_t vsize; | |
|
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1136 intptr_t rss; |
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1137 uintptr_t rsslim; |
| 0 | 1138 uintptr_t scodes; |
| 1139 uintptr_t ecode; | |
| 1140 int i; | |
| 1141 | |
| 1142 // Figure what the primordial thread stack base is. Code is inspired | |
| 1143 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
| 1144 // followed by command name surrounded by parentheses, state, etc. | |
| 1145 char stat[2048]; | |
| 1146 int statlen; | |
| 1147 | |
| 1148 fp = fopen("/proc/self/stat", "r"); | |
| 1149 if (fp) { | |
| 1150 statlen = fread(stat, 1, 2047, fp); | |
| 1151 stat[statlen] = '\0'; | |
| 1152 fclose(fp); | |
| 1153 | |
| 1154 // Skip pid and the command string. Note that we could be dealing with | |
| 1155 // weird command names, e.g. user could decide to rename java launcher | |
| 1156 // to "java 1.4.2 :)", then the stat file would look like | |
| 1157 // 1234 (java 1.4.2 :)) R ... ... | |
| 1158 // We don't really need to know the command string, just find the last | |
| 1159 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 1160 char * s = strrchr(stat, ')'); | |
| 1161 | |
| 1162 i = 0; | |
| 1163 if (s) { | |
| 1164 // Skip blank chars | |
| 1165 do s++; while (isspace(*s)); | |
| 1166 | |
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1167 #define _UFM UINTX_FORMAT |
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1168 #define _DFM INTX_FORMAT |
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1169 |
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1170 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ |
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1171 /* 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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1172 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 | 1173 &state, /* 3 %c */ |
| 1174 &ppid, /* 4 %d */ | |
| 1175 &pgrp, /* 5 %d */ | |
| 1176 &session, /* 6 %d */ | |
| 1177 &nr, /* 7 %d */ | |
| 1178 &tpgrp, /* 8 %d */ | |
| 1179 &flags, /* 9 %lu */ | |
| 1180 &minflt, /* 10 %lu */ | |
| 1181 &cminflt, /* 11 %lu */ | |
| 1182 &majflt, /* 12 %lu */ | |
| 1183 &cmajflt, /* 13 %lu */ | |
| 1184 &utime, /* 14 %lu */ | |
| 1185 &stime, /* 15 %lu */ | |
| 1186 &cutime, /* 16 %ld */ | |
| 1187 &cstime, /* 17 %ld */ | |
| 1188 &prio, /* 18 %ld */ | |
| 1189 &nice, /* 19 %ld */ | |
| 1190 &junk, /* 20 %ld */ | |
| 1191 &it_real, /* 21 %ld */ | |
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1192 &start, /* 22 UINTX_FORMAT */ |
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1193 &vsize, /* 23 UINTX_FORMAT */ |
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1194 &rss, /* 24 INTX_FORMAT */ |
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1195 &rsslim, /* 25 UINTX_FORMAT */ |
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1196 &scodes, /* 26 UINTX_FORMAT */ |
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1197 &ecode, /* 27 UINTX_FORMAT */ |
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1198 &stack_start); /* 28 UINTX_FORMAT */ |
| 0 | 1199 } |
| 1200 | |
|
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1201 #undef _UFM |
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1202 #undef _DFM |
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1203 |
| 0 | 1204 if (i != 28 - 2) { |
| 1205 assert(false, "Bad conversion from /proc/self/stat"); | |
| 1206 // product mode - assume we are the initial thread, good luck in the | |
| 1207 // embedded case. | |
| 1208 warning("Can't detect initial thread stack location - bad conversion"); | |
| 1209 stack_start = (uintptr_t) &rlim; | |
| 1210 } | |
| 1211 } else { | |
| 1212 // For some reason we can't open /proc/self/stat (for example, running on | |
| 1213 // FreeBSD with a Linux emulator, or inside chroot), this should work for | |
| 1214 // most cases, so don't abort: | |
| 1215 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
| 1216 stack_start = (uintptr_t) &rlim; | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 // Now we have a pointer (stack_start) very close to the stack top, the | |
| 1221 // next thing to do is to figure out the exact location of stack top. We | |
| 1222 // can find out the virtual memory area that contains stack_start by | |
| 1223 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
| 1224 // and its upper limit is the real stack top. (again, this would fail if | |
| 1225 // running inside chroot, because /proc may not exist.) | |
| 1226 | |
| 1227 uintptr_t stack_top; | |
| 1228 address low, high; | |
| 1229 if (find_vma((address)stack_start, &low, &high)) { | |
| 1230 // success, "high" is the true stack top. (ignore "low", because initial | |
| 1231 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
| 1232 stack_top = (uintptr_t)high; | |
| 1233 } else { | |
| 1234 // failed, likely because /proc/self/maps does not exist | |
| 1235 warning("Can't detect initial thread stack location - find_vma failed"); | |
| 1236 // best effort: stack_start is normally within a few pages below the real | |
| 1237 // stack top, use it as stack top, and reduce stack size so we won't put | |
| 1238 // guard page outside stack. | |
| 1239 stack_top = stack_start; | |
| 1240 stack_size -= 16 * page_size(); | |
| 1241 } | |
| 1242 | |
| 1243 // stack_top could be partially down the page so align it | |
| 1244 stack_top = align_size_up(stack_top, page_size()); | |
| 1245 | |
| 1246 if (max_size && stack_size > max_size) { | |
| 1247 _initial_thread_stack_size = max_size; | |
| 1248 } else { | |
| 1249 _initial_thread_stack_size = stack_size; | |
| 1250 } | |
| 1251 | |
| 1252 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
| 1253 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
| 1254 } | |
| 1255 | |
| 1256 //////////////////////////////////////////////////////////////////////////////// | |
| 1257 // time support | |
| 1258 | |
| 1259 // Time since start-up in seconds to a fine granularity. | |
| 1260 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 1261 double os::elapsedTime() { | |
| 1262 | |
|
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1263 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution |
| 0 | 1264 } |
| 1265 | |
| 1266 jlong os::elapsed_counter() { | |
|
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1267 return javaTimeNanos() - initial_time_count; |
| 0 | 1268 } |
| 1269 | |
| 1270 jlong os::elapsed_frequency() { | |
|
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1271 return NANOSECS_PER_SEC; // nanosecond resolution |
| 0 | 1272 } |
| 1273 | |
|
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1274 bool os::supports_vtime() { return true; } |
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1275 bool os::enable_vtime() { return false; } |
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1276 bool os::vtime_enabled() { return false; } |
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1277 |
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1278 double os::elapsedVTime() { |
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1279 struct rusage usage; |
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1280 int retval = getrusage(RUSAGE_THREAD, &usage); |
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1281 if (retval == 0) { |
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1282 return (double) (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) + (double) (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000 * 1000); |
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1283 } else { |
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1284 // better than nothing, but not much |
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1285 return elapsedTime(); |
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1286 } |
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1287 } |
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1288 |
| 61 | 1289 jlong os::javaTimeMillis() { |
| 0 | 1290 timeval time; |
| 1291 int status = gettimeofday(&time, NULL); | |
| 1292 assert(status != -1, "linux error"); | |
| 1293 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 1294 } | |
| 1295 | |
| 1296 #ifndef CLOCK_MONOTONIC | |
| 1297 #define CLOCK_MONOTONIC (1) | |
| 1298 #endif | |
| 1299 | |
| 1300 void os::Linux::clock_init() { | |
| 1301 // we do dlopen's in this particular order due to bug in linux | |
| 1302 // dynamical loader (see 6348968) leading to crash on exit | |
| 1303 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
| 1304 if (handle == NULL) { | |
| 1305 handle = dlopen("librt.so", RTLD_LAZY); | |
| 1306 } | |
| 1307 | |
| 1308 if (handle) { | |
| 1309 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
| 1310 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
| 1311 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
| 1312 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
| 1313 if (clock_getres_func && clock_gettime_func) { | |
| 1314 // See if monotonic clock is supported by the kernel. Note that some | |
| 1315 // early implementations simply return kernel jiffies (updated every | |
| 1316 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
| 1317 // for nano time (though the monotonic property is still nice to have). | |
| 1318 // It's fixed in newer kernels, however clock_getres() still returns | |
| 1319 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
| 1320 // resolution for now. Hopefully as people move to new kernels, this | |
| 1321 // won't be a problem. | |
| 1322 struct timespec res; | |
| 1323 struct timespec tp; | |
| 1324 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
| 1325 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
| 1326 // yes, monotonic clock is supported | |
| 1327 _clock_gettime = clock_gettime_func; | |
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1328 return; |
| 0 | 1329 } else { |
| 1330 // close librt if there is no monotonic clock | |
| 1331 dlclose(handle); | |
| 1332 } | |
| 1333 } | |
| 1334 } | |
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1335 warning("No monotonic clock was available - timed services may " \ |
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1336 "be adversely affected if the time-of-day clock changes"); |
| 0 | 1337 } |
| 1338 | |
| 1339 #ifndef SYS_clock_getres | |
| 1340 | |
| 1341 #if defined(IA32) || defined(AMD64) | |
| 1342 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
|
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|
1343 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
| 0 | 1344 #else |
|
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|
1345 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" |
|
126ea7725993
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1642
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|
1346 #define sys_clock_getres(x,y) -1 |
| 0 | 1347 #endif |
| 1348 | |
|
1681
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|
1349 #else |
|
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|
1350 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) |
| 0 | 1351 #endif |
| 1352 | |
| 1353 void os::Linux::fast_thread_clock_init() { | |
| 1354 if (!UseLinuxPosixThreadCPUClocks) { | |
| 1355 return; | |
| 1356 } | |
| 1357 clockid_t clockid; | |
| 1358 struct timespec tp; | |
| 1359 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
| 1360 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
| 1361 | |
| 1362 // Switch to using fast clocks for thread cpu time if | |
| 1363 // the sys_clock_getres() returns 0 error code. | |
| 1364 // Note, that some kernels may support the current thread | |
| 1365 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
| 1366 // returned by the pthread_getcpuclockid(). | |
| 1367 // If the fast Posix clocks are supported then the sys_clock_getres() | |
| 1368 // must return at least tp.tv_sec == 0 which means a resolution | |
| 1369 // better than 1 sec. This is extra check for reliability. | |
| 1370 | |
| 1371 if(pthread_getcpuclockid_func && | |
| 1372 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
| 1373 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
| 1374 | |
| 1375 _supports_fast_thread_cpu_time = true; | |
| 1376 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
| 1377 } | |
| 1378 } | |
| 1379 | |
| 1380 jlong os::javaTimeNanos() { | |
| 1381 if (Linux::supports_monotonic_clock()) { | |
| 1382 struct timespec tp; | |
| 1383 int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 1384 assert(status == 0, "gettime error"); | |
| 1385 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 1386 return result; | |
| 1387 } else { | |
| 1388 timeval time; | |
| 1389 int status = gettimeofday(&time, NULL); | |
| 1390 assert(status != -1, "linux error"); | |
| 1391 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 1392 return 1000 * usecs; | |
| 1393 } | |
| 1394 } | |
| 1395 | |
| 1396 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 1397 if (Linux::supports_monotonic_clock()) { | |
| 1398 info_ptr->max_value = ALL_64_BITS; | |
| 1399 | |
| 1400 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 1401 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 1402 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 1403 } else { | |
| 1404 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1405 info_ptr->max_value = ALL_64_BITS; | |
| 1406 | |
| 1407 // gettimeofday is a real time clock so it skips | |
| 1408 info_ptr->may_skip_backward = true; | |
| 1409 info_ptr->may_skip_forward = true; | |
| 1410 } | |
| 1411 | |
| 1412 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1413 } | |
| 1414 | |
| 1415 // Return the real, user, and system times in seconds from an | |
| 1416 // arbitrary fixed point in the past. | |
| 1417 bool os::getTimesSecs(double* process_real_time, | |
| 1418 double* process_user_time, | |
| 1419 double* process_system_time) { | |
| 1420 struct tms ticks; | |
| 1421 clock_t real_ticks = times(&ticks); | |
| 1422 | |
| 1423 if (real_ticks == (clock_t) (-1)) { | |
| 1424 return false; | |
| 1425 } else { | |
| 1426 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1427 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1428 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1429 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1430 | |
| 1431 return true; | |
| 1432 } | |
| 1433 } | |
| 1434 | |
| 1435 | |
| 1436 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1437 struct tm t; | |
| 1438 time_t long_time; | |
| 1439 time(&long_time); | |
| 1440 localtime_r(&long_time, &t); | |
| 1441 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1442 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1443 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1444 return buf; | |
| 1445 } | |
| 1446 | |
|
548
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516
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|
1447 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { |
|
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|
1448 return localtime_r(clock, res); |
|
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diff
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|
1449 } |
|
773234c55e8c
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diff
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|
1450 |
| 0 | 1451 //////////////////////////////////////////////////////////////////////////////// |
| 1452 // runtime exit support | |
| 1453 | |
| 1454 // Note: os::shutdown() might be called very early during initialization, or | |
| 1455 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1456 // sure it is async-safe and can handle partially initialized VM. | |
| 1457 void os::shutdown() { | |
| 1458 | |
| 1459 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1460 perfMemory_exit(); | |
| 1461 | |
| 1462 // needs to remove object in file system | |
| 1463 AttachListener::abort(); | |
| 1464 | |
| 1465 // flush buffered output, finish log files | |
| 1466 ostream_abort(); | |
| 1467 | |
| 1468 // Check for abort hook | |
| 1469 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1470 if (abort_hook != NULL) { | |
| 1471 abort_hook(); | |
| 1472 } | |
| 1473 | |
| 1474 } | |
| 1475 | |
| 1476 // Note: os::abort() might be called very early during initialization, or | |
| 1477 // called from signal handler. Before adding something to os::abort(), make | |
| 1478 // sure it is async-safe and can handle partially initialized VM. | |
| 1479 void os::abort(bool dump_core) { | |
| 1480 os::shutdown(); | |
| 1481 if (dump_core) { | |
| 1482 #ifndef PRODUCT | |
| 1483 fdStream out(defaultStream::output_fd()); | |
| 1484 out.print_raw("Current thread is "); | |
| 1485 char buf[16]; | |
| 1486 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1487 out.print_raw_cr(buf); | |
| 1488 out.print_raw_cr("Dumping core ..."); | |
| 1489 #endif | |
| 1490 ::abort(); // dump core | |
| 1491 } | |
| 1492 | |
| 1493 ::exit(1); | |
| 1494 } | |
| 1495 | |
| 1496 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1497 void os::die() { | |
| 1498 // _exit() on LinuxThreads only kills current thread | |
| 1499 ::abort(); | |
| 1500 } | |
| 1501 | |
|
1980
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diff
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|
1502 |
|
828eafbd85cc
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1972
diff
changeset
|
1503 // This method is a copy of JDK's sysGetLastErrorString |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
1504 // from src/solaris/hpi/src/system_md.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
1505 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
1506 size_t os::lasterror(char *buf, size_t len) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
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|
1507 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1508 if (errno == 0) return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1509 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1510 const char *s = ::strerror(errno); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1511 size_t n = ::strlen(s); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1512 if (n >= len) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1513 n = len - 1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
1514 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
1515 ::strncpy(buf, s, n); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
1516 buf[n] = '\0'; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
1517 return n; |
|
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6348631: remove the use of the HPI library from Hotspot
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diff
changeset
|
1518 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
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|
1519 |
| 0 | 1520 intx os::current_thread_id() { return (intx)pthread_self(); } |
| 1521 int os::current_process_id() { | |
| 1522 | |
| 1523 // Under the old linux thread library, linux gives each thread | |
| 1524 // its own process id. Because of this each thread will return | |
| 1525 // a different pid if this method were to return the result | |
| 1526 // of getpid(2). Linux provides no api that returns the pid | |
| 1527 // of the launcher thread for the vm. This implementation | |
| 1528 // returns a unique pid, the pid of the launcher thread | |
| 1529 // that starts the vm 'process'. | |
| 1530 | |
| 1531 // Under the NPTL, getpid() returns the same pid as the | |
| 1532 // launcher thread rather than a unique pid per thread. | |
| 1533 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1534 | |
| 1535 // if you are looking for the result of a call to getpid() that | |
| 1536 // returns a unique pid for the calling thread, then look at the | |
| 1537 // OSThread::thread_id() method in osThread_linux.hpp file | |
| 1538 | |
| 1539 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1540 } | |
| 1541 | |
| 1542 // DLL functions | |
| 1543 | |
| 1544 const char* os::dll_file_extension() { return ".so"; } | |
| 1545 | |
|
2130
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
coleenp
parents:
2033
diff
changeset
|
1546 // This must be hard coded because it's the system's temporary |
|
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
coleenp
parents:
2033
diff
changeset
|
1547 // directory not the java application's temp directory, ala java.io.tmpdir. |
|
34d64ad817f4
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
coleenp
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2033
diff
changeset
|
1548 const char* os::get_temp_directory() { return "/tmp"; } |
| 0 | 1549 |
| 691 | 1550 static bool file_exists(const char* filename) { |
| 1551 struct stat statbuf; | |
| 1552 if (filename == NULL || strlen(filename) == 0) { | |
| 1553 return false; | |
| 1554 } | |
| 1555 return os::stat(filename, &statbuf) == 0; | |
| 1556 } | |
| 1557 | |
|
6966
6cb0d32b828b
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bpittore
parents:
6825
diff
changeset
|
1558 bool os::dll_build_name(char* buffer, size_t buflen, |
| 691 | 1559 const char* pname, const char* fname) { |
|
6966
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8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
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6825
diff
changeset
|
1560 bool retval = false; |
| 691 | 1561 // Copied from libhpi |
| 242 | 1562 const size_t pnamelen = pname ? strlen(pname) : 0; |
| 1563 | |
|
6966
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bpittore
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6825
diff
changeset
|
1564 // Return error on buffer overflow. |
| 242 | 1565 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { |
|
6966
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6825
diff
changeset
|
1566 return retval; |
| 242 | 1567 } |
| 1568 | |
| 1569 if (pnamelen == 0) { | |
| 691 | 1570 snprintf(buffer, buflen, "lib%s.so", fname); |
|
6966
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6825
diff
changeset
|
1571 retval = true; |
| 691 | 1572 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1573 int n; | |
| 1574 char** pelements = split_path(pname, &n); | |
|
9059
17bf4d428955
8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
ccheung
parents:
8812
diff
changeset
|
1575 if (pelements == NULL) { |
| 9062 | 1576 return false; |
|
9059
17bf4d428955
8006103: [parfait] Possible null pointer dereference at hotspot/src/os/linux/vm/os_linux.cpp; os_windows.cpp; os_solaris.cpp; os_bsd.cpp
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parents:
8812
diff
changeset
|
1577 } |
| 691 | 1578 for (int i = 0 ; i < n ; i++) { |
| 1579 // Really shouldn't be NULL, but check can't hurt | |
| 1580 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1581 continue; // skip the empty path values | |
| 1582 } | |
| 1583 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
| 1584 if (file_exists(buffer)) { | |
|
6966
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6825
diff
changeset
|
1585 retval = true; |
| 691 | 1586 break; |
| 1587 } | |
| 1588 } | |
| 1589 // release the storage | |
| 1590 for (int i = 0 ; i < n ; i++) { | |
| 1591 if (pelements[i] != NULL) { | |
| 6197 | 1592 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 691 | 1593 } |
| 1594 } | |
| 1595 if (pelements != NULL) { | |
| 6197 | 1596 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 691 | 1597 } |
| 242 | 1598 } else { |
| 691 | 1599 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); |
|
6966
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6825
diff
changeset
|
1600 retval = true; |
|
6cb0d32b828b
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6825
diff
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|
1601 } |
|
6cb0d32b828b
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6825
diff
changeset
|
1602 return retval; |
| 242 | 1603 } |
| 1604 | |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
1605 // check if addr is inside libjvm.so |
| 0 | 1606 bool os::address_is_in_vm(address addr) { |
| 1607 static address libjvm_base_addr; | |
| 1608 Dl_info dlinfo; | |
| 1609 | |
| 1610 if (libjvm_base_addr == NULL) { | |
|
11092
59b052799158
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dcubed
parents:
10986
diff
changeset
|
1611 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1612 libjvm_base_addr = (address)dlinfo.dli_fbase; |
|
59b052799158
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dcubed
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10986
diff
changeset
|
1613 } |
| 0 | 1614 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
| 1615 } | |
| 1616 | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1617 if (dladdr((void *)addr, &dlinfo) != 0) { |
| 0 | 1618 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
| 1619 } | |
| 1620 | |
| 1621 return false; | |
| 1622 } | |
| 1623 | |
| 1624 bool os::dll_address_to_function_name(address addr, char *buf, | |
| 1625 int buflen, int *offset) { | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
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|
1626 // buf is not optional, but offset is optional |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1627 assert(buf != NULL, "sanity check"); |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1628 |
| 0 | 1629 Dl_info dlinfo; |
| 1630 | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1631 if (dladdr((void*)addr, &dlinfo) != 0) { |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1632 // see if we have a matching symbol |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1633 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1634 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
|
2022
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
zgu
parents:
1972
diff
changeset
|
1635 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
|
2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
zgu
parents:
1972
diff
changeset
|
1636 } |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1637 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1638 return true; |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1639 } |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1640 // no matching symbol so try for just file info |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
1641 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
|
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|
1642 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
|
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|
1643 buf, buflen, offset, dlinfo.dli_fname)) { |
|
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|
1644 return true; |
|
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|
1645 } |
|
2022
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|
1646 } |
|
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|
1647 } |
|
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|
1648 |
|
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|
1649 buf[0] = '\0'; |
|
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|
1650 if (offset != NULL) *offset = -1; |
|
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|
1651 return false; |
| 0 | 1652 } |
| 1653 | |
| 1654 struct _address_to_library_name { | |
| 1655 address addr; // input : memory address | |
| 1656 size_t buflen; // size of fname | |
| 1657 char* fname; // output: library name | |
| 1658 address base; // library base addr | |
| 1659 }; | |
| 1660 | |
| 1661 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
| 1662 size_t size, void *data) { | |
| 1663 int i; | |
| 1664 bool found = false; | |
| 1665 address libbase = NULL; | |
| 1666 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
| 1667 | |
| 1668 // iterate through all loadable segments | |
| 1669 for (i = 0; i < info->dlpi_phnum; i++) { | |
| 1670 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
| 1671 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
| 1672 // base address of a library is the lowest address of its loaded | |
| 1673 // segments. | |
| 1674 if (libbase == NULL || libbase > segbase) { | |
| 1675 libbase = segbase; | |
| 1676 } | |
| 1677 // see if 'addr' is within current segment | |
| 1678 if (segbase <= d->addr && | |
| 1679 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
| 1680 found = true; | |
| 1681 } | |
| 1682 } | |
| 1683 } | |
| 1684 | |
| 1685 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
| 1686 // so dll_address_to_library_name() can fall through to use dladdr() which | |
| 1687 // can figure out executable name from argv[0]. | |
| 1688 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
| 1689 d->base = libbase; | |
| 1690 if (d->fname) { | |
| 1691 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
| 1692 } | |
| 1693 return 1; | |
| 1694 } | |
| 1695 return 0; | |
| 1696 } | |
| 1697 | |
| 1698 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1699 int buflen, int* offset) { | |
|
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|
1700 // buf is not optional, but offset is optional |
|
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|
1701 assert(buf != NULL, "sanity check"); |
|
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|
1702 |
| 0 | 1703 Dl_info dlinfo; |
| 1704 struct _address_to_library_name data; | |
| 1705 | |
| 1706 // There is a bug in old glibc dladdr() implementation that it could resolve | |
| 1707 // to wrong library name if the .so file has a base address != NULL. Here | |
| 1708 // we iterate through the program headers of all loaded libraries to find | |
| 1709 // out which library 'addr' really belongs to. This workaround can be | |
| 1710 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
| 1711 data.addr = addr; | |
| 1712 data.fname = buf; | |
| 1713 data.buflen = buflen; | |
| 1714 data.base = NULL; | |
| 1715 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
| 1716 | |
| 1717 if (rslt) { | |
| 1718 // buf already contains library name | |
| 1719 if (offset) *offset = addr - data.base; | |
| 1720 return true; | |
|
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|
1721 } |
|
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|
1722 if (dladdr((void*)addr, &dlinfo) != 0) { |
|
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|
1723 if (dlinfo.dli_fname != NULL) { |
|
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|
1724 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
|
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|
1725 } |
|
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|
1726 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
|
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|
1727 *offset = addr - (address)dlinfo.dli_fbase; |
|
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|
1728 } |
|
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|
1729 return true; |
|
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|
1730 } |
|
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|
1731 |
|
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|
1732 buf[0] = '\0'; |
|
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|
1733 if (offset) *offset = -1; |
|
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|
1734 return false; |
| 0 | 1735 } |
| 1736 | |
| 1737 // Loads .dll/.so and | |
| 1738 // in case of error it checks if .dll/.so was built for the | |
| 1739 // same architecture as Hotspot is running on | |
| 1740 | |
|
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|
1741 |
|
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|
1742 // Remember the stack's state. The Linux dynamic linker will change |
|
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|
1743 // the stack to 'executable' at most once, so we must safepoint only once. |
|
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|
1744 bool os::Linux::_stack_is_executable = false; |
|
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|
1745 |
|
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|
1746 // VM operation that loads a library. This is necessary if stack protection |
|
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|
1747 // of the Java stacks can be lost during loading the library. If we |
|
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|
1748 // do not stop the Java threads, they can stack overflow before the stacks |
|
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|
1749 // are protected again. |
|
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|
1750 class VM_LinuxDllLoad: public VM_Operation { |
|
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|
1751 private: |
|
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|
1752 const char *_filename; |
|
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|
1753 char *_ebuf; |
|
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|
1754 int _ebuflen; |
|
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|
1755 void *_lib; |
|
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|
1756 public: |
|
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|
1757 VM_LinuxDllLoad(const char *fn, char *ebuf, int ebuflen) : |
|
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|
1758 _filename(fn), _ebuf(ebuf), _ebuflen(ebuflen), _lib(NULL) {} |
|
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|
1759 VMOp_Type type() const { return VMOp_LinuxDllLoad; } |
|
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|
1760 void doit() { |
|
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|
1761 _lib = os::Linux::dll_load_in_vmthread(_filename, _ebuf, _ebuflen); |
|
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|
1762 os::Linux::_stack_is_executable = true; |
|
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|
1763 } |
|
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|
1764 void* loaded_library() { return _lib; } |
|
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|
1765 }; |
|
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|
1766 |
| 0 | 1767 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) |
| 1768 { | |
|
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|
1769 void * result = NULL; |
|
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|
1770 bool load_attempted = false; |
|
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|
1771 |
|
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|
1772 // Check whether the library to load might change execution rights |
|
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|
1773 // of the stack. If they are changed, the protection of the stack |
|
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|
1774 // guard pages will be lost. We need a safepoint to fix this. |
|
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|
1775 // |
|
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|
1776 // See Linux man page execstack(8) for more info. |
|
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|
1777 if (os::uses_stack_guard_pages() && !os::Linux::_stack_is_executable) { |
|
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|
1778 ElfFile ef(filename); |
|
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|
1779 if (!ef.specifies_noexecstack()) { |
|
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|
1780 if (!is_init_completed()) { |
|
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|
1781 os::Linux::_stack_is_executable = true; |
|
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|
1782 // This is OK - No Java threads have been created yet, and hence no |
|
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|
1783 // stack guard pages to fix. |
|
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|
1784 // |
|
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|
1785 // This should happen only when you are building JDK7 using a very |
|
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|
1786 // old version of JDK6 (e.g., with JPRT) and running test_gamma. |
|
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|
1787 // |
|
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|
1788 // Dynamic loader will make all stacks executable after |
|
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|
1789 // this function returns, and will not do that again. |
|
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|
1790 assert(Threads::first() == NULL, "no Java threads should exist yet."); |
|
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|
1791 } else { |
|
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|
1792 warning("You have loaded library %s which might have disabled stack guard. " |
|
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|
1793 "The VM will try to fix the stack guard now.\n" |
|
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|
1794 "It's highly recommended that you fix the library with " |
|
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|
1795 "'execstack -c <libfile>', or link it with '-z noexecstack'.", |
|
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|
1796 filename); |
|
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|
1797 |
|
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|
1798 assert(Thread::current()->is_Java_thread(), "must be Java thread"); |
|
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|
1799 JavaThread *jt = JavaThread::current(); |
|
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|
1800 if (jt->thread_state() != _thread_in_native) { |
|
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|
1801 // This happens when a compiler thread tries to load a hsdis-<arch>.so file |
|
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|
1802 // that requires ExecStack. Cannot enter safe point. Let's give up. |
|
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|
1803 warning("Unable to fix stack guard. Giving up."); |
|
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|
1804 } else { |
|
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|
1805 if (!LoadExecStackDllInVMThread) { |
|
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|
1806 // This is for the case where the DLL has an static |
|
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|
1807 // constructor function that executes JNI code. We cannot |
|
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|
1808 // load such DLLs in the VMThread. |
|
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|
1809 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
|
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|
1810 } |
|
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|
1811 |
|
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|
1812 ThreadInVMfromNative tiv(jt); |
|
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|
1813 debug_only(VMNativeEntryWrapper vew;) |
|
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1814 |
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1815 VM_LinuxDllLoad op(filename, ebuf, ebuflen); |
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1816 VMThread::execute(&op); |
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1817 if (LoadExecStackDllInVMThread) { |
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1818 result = op.loaded_library(); |
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1819 } |
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1820 load_attempted = true; |
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1821 } |
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1822 } |
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1823 } |
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1824 } |
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1825 |
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1826 if (!load_attempted) { |
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1827 result = os::Linux::dlopen_helper(filename, ebuf, ebuflen); |
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1828 } |
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1829 |
| 0 | 1830 if (result != NULL) { |
| 1831 // Successful loading | |
| 1832 return result; | |
| 1833 } | |
| 1834 | |
| 1835 Elf32_Ehdr elf_head; | |
| 1836 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1837 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1838 | |
| 1839 if (diag_msg_max_length==0) { | |
| 1840 // No more space in ebuf for additional diagnostics message | |
| 1841 return NULL; | |
| 1842 } | |
| 1843 | |
| 1844 | |
| 1845 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1846 | |
| 1847 if (file_descriptor < 0) { | |
| 1848 // Can't open library, report dlerror() message | |
| 1849 return NULL; | |
| 1850 } | |
| 1851 | |
| 1852 bool failed_to_read_elf_head= | |
| 1853 (sizeof(elf_head)!= | |
| 1854 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1855 | |
| 1856 ::close(file_descriptor); | |
| 1857 if (failed_to_read_elf_head) { | |
| 1858 // file i/o error - report dlerror() msg | |
| 1859 return NULL; | |
| 1860 } | |
| 1861 | |
| 1862 typedef struct { | |
| 1863 Elf32_Half code; // Actual value as defined in elf.h | |
| 1864 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1865 char elf_class; // 32 or 64 bit | |
| 1866 char endianess; // MSB or LSB | |
| 1867 char* name; // String representation | |
| 1868 } arch_t; | |
| 1869 | |
| 1870 #ifndef EM_486 | |
| 1871 #define EM_486 6 /* Intel 80486 */ | |
| 1872 #endif | |
| 1873 | |
| 1874 static const arch_t arch_array[]={ | |
| 1875 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1876 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1877 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1878 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1879 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1880 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1881 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1882 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
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1883 #if defined(VM_LITTLE_ENDIAN) |
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1884 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2LSB, (char*)"Power PC 64"}, |
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1885 #else |
| 1010 | 1886 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, |
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1887 #endif |
| 1010 | 1888 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, |
| 1889 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1890 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1891 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1892 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1893 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1894 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 0 | 1895 }; |
| 1896 | |
| 1897 #if (defined IA32) | |
| 1898 static Elf32_Half running_arch_code=EM_386; | |
| 1899 #elif (defined AMD64) | |
| 1900 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1901 #elif (defined IA64) | |
| 1902 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1903 #elif (defined __sparc) && (defined _LP64) | |
| 1904 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1905 #elif (defined __sparc) && (!defined _LP64) | |
| 1906 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1907 #elif (defined __powerpc64__) | |
| 1908 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1909 #elif (defined __powerpc__) | |
| 1910 static Elf32_Half running_arch_code=EM_PPC; | |
| 1010 | 1911 #elif (defined ARM) |
| 1912 static Elf32_Half running_arch_code=EM_ARM; | |
| 1913 #elif (defined S390) | |
| 1914 static Elf32_Half running_arch_code=EM_S390; | |
| 1915 #elif (defined ALPHA) | |
| 1916 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1917 #elif (defined MIPSEL) | |
| 1918 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1919 #elif (defined PARISC) | |
| 1920 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1921 #elif (defined MIPS) | |
| 1922 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1923 #elif (defined M68K) | |
| 1924 static Elf32_Half running_arch_code=EM_68K; | |
| 0 | 1925 #else |
| 1926 #error Method os::dll_load requires that one of following is defined:\ | |
| 1010 | 1927 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K |
| 0 | 1928 #endif |
| 1929 | |
| 1930 // Identify compatability class for VM's architecture and library's architecture | |
| 1931 // Obtain string descriptions for architectures | |
| 1932 | |
| 1933 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1934 int running_arch_index=-1; | |
| 1935 | |
| 1936 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1937 if (running_arch_code == arch_array[i].code) { | |
| 1938 running_arch_index = i; | |
| 1939 } | |
| 1940 if (lib_arch.code == arch_array[i].code) { | |
| 1941 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1942 lib_arch.name = arch_array[i].name; | |
| 1943 } | |
| 1944 } | |
| 1945 | |
| 1946 assert(running_arch_index != -1, | |
| 1947 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1948 if (running_arch_index == -1) { | |
| 1949 // Even though running architecture detection failed | |
| 1950 // we may still continue with reporting dlerror() message | |
| 1951 return NULL; | |
| 1952 } | |
| 1953 | |
| 1954 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1955 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1956 return NULL; | |
| 1957 } | |
| 1958 | |
| 1010 | 1959 #ifndef S390 |
| 0 | 1960 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { |
| 1961 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1962 return NULL; | |
| 1963 } | |
| 1010 | 1964 #endif // !S390 |
| 0 | 1965 |
| 1966 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1967 if ( lib_arch.name!=NULL ) { | |
| 1968 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1969 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1970 lib_arch.name, arch_array[running_arch_index].name); | |
| 1971 } else { | |
| 1972 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1973 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1974 lib_arch.code, | |
| 1975 arch_array[running_arch_index].name); | |
| 1976 } | |
| 1977 } | |
| 1978 | |
| 1979 return NULL; | |
| 1980 } | |
| 1981 | |
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1982 void * os::Linux::dlopen_helper(const char *filename, char *ebuf, int ebuflen) { |
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1983 void * result = ::dlopen(filename, RTLD_LAZY); |
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1984 if (result == NULL) { |
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1985 ::strncpy(ebuf, ::dlerror(), ebuflen - 1); |
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1986 ebuf[ebuflen-1] = '\0'; |
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1987 } |
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1988 return result; |
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1989 } |
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1990 |
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1991 void * os::Linux::dll_load_in_vmthread(const char *filename, char *ebuf, int ebuflen) { |
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1992 void * result = NULL; |
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1993 if (LoadExecStackDllInVMThread) { |
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1994 result = dlopen_helper(filename, ebuf, ebuflen); |
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1995 } |
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1996 |
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1997 // Since 7019808, libjvm.so is linked with -noexecstack. If the VM loads a |
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1998 // library that requires an executable stack, or which does not have this |
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1999 // stack attribute set, dlopen changes the stack attribute to executable. The |
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2000 // read protection of the guard pages gets lost. |
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2001 // |
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2002 // Need to check _stack_is_executable again as multiple VM_LinuxDllLoad |
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2003 // may have been queued at the same time. |
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2004 |
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2005 if (!_stack_is_executable) { |
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2006 JavaThread *jt = Threads::first(); |
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2007 |
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2008 while (jt) { |
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2009 if (!jt->stack_guard_zone_unused() && // Stack not yet fully initialized |
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2010 jt->stack_yellow_zone_enabled()) { // No pending stack overflow exceptions |
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2011 if (!os::guard_memory((char *) jt->stack_red_zone_base() - jt->stack_red_zone_size(), |
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2012 jt->stack_yellow_zone_size() + jt->stack_red_zone_size())) { |
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2013 warning("Attempt to reguard stack yellow zone failed."); |
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2014 } |
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2015 } |
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2016 jt = jt->next(); |
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2017 } |
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2018 } |
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2019 |
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2020 return result; |
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2021 } |
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2022 |
| 242 | 2023 /* |
| 2024 * glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
| 2025 * chances are you might want to run the generated bits against glibc-2.0 | |
| 2026 * libdl.so, so always use locking for any version of glibc. | |
| 2027 */ | |
| 2028 void* os::dll_lookup(void* handle, const char* name) { | |
| 2029 pthread_mutex_lock(&dl_mutex); | |
| 2030 void* res = dlsym(handle, name); | |
| 2031 pthread_mutex_unlock(&dl_mutex); | |
| 2032 return res; | |
| 2033 } | |
| 0 | 2034 |
|
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2035 void* os::get_default_process_handle() { |
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2036 return (void*)::dlopen(NULL, RTLD_LAZY); |
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2037 } |
| 0 | 2038 |
|
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2039 static bool _print_ascii_file(const char* filename, outputStream* st) { |
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2040 int fd = ::open(filename, O_RDONLY); |
| 0 | 2041 if (fd == -1) { |
| 2042 return false; | |
| 2043 } | |
| 2044 | |
| 2045 char buf[32]; | |
| 2046 int bytes; | |
|
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2047 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { |
| 0 | 2048 st->print_raw(buf, bytes); |
| 2049 } | |
| 2050 | |
|
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2051 ::close(fd); |
| 0 | 2052 |
| 2053 return true; | |
| 2054 } | |
| 2055 | |
| 2056 void os::print_dll_info(outputStream *st) { | |
| 2057 st->print_cr("Dynamic libraries:"); | |
| 2058 | |
| 2059 char fname[32]; | |
| 2060 pid_t pid = os::Linux::gettid(); | |
| 2061 | |
| 2062 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
| 2063 | |
| 2064 if (!_print_ascii_file(fname, st)) { | |
| 2065 st->print("Can not get library information for pid = %d\n", pid); | |
| 2066 } | |
| 2067 } | |
| 2068 | |
|
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2069 void os::print_os_info_brief(outputStream* st) { |
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2070 os::Linux::print_distro_info(st); |
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2071 |
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|
2072 os::Posix::print_uname_info(st); |
|
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|
2073 |
|
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|
2074 os::Linux::print_libversion_info(st); |
|
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2075 |
|
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|
2076 } |
| 0 | 2077 |
| 2078 void os::print_os_info(outputStream* st) { | |
| 2079 st->print("OS:"); | |
| 2080 | |
|
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2081 os::Linux::print_distro_info(st); |
|
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|
2082 |
|
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2083 os::Posix::print_uname_info(st); |
|
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|
2084 |
|
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|
2085 // Print warning if unsafe chroot environment detected |
|
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|
2086 if (unsafe_chroot_detected) { |
|
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|
2087 st->print("WARNING!! "); |
|
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2088 st->print_cr("%s", unstable_chroot_error); |
|
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2089 } |
|
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|
2090 |
|
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|
2091 os::Linux::print_libversion_info(st); |
|
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|
2092 |
|
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|
2093 os::Posix::print_rlimit_info(st); |
|
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|
2094 |
|
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|
2095 os::Posix::print_load_average(st); |
|
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|
2096 |
|
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|
2097 os::Linux::print_full_memory_info(st); |
|
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|
2098 } |
|
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|
2099 |
|
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|
2100 // Try to identify popular distros. |
|
12212
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|
2101 // Most Linux distributions have a /etc/XXX-release file, which contains |
|
4472884d8b37
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2102 // the OS version string. Newer Linux distributions have a /etc/lsb-release |
|
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2103 // file that also contains the OS version string. Some have more than one |
|
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|
2104 // /etc/XXX-release file (e.g. Mandrake has both /etc/mandrake-release and |
|
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|
2105 // /etc/redhat-release.), so the order is important. |
|
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|
2106 // Any Linux that is based on Redhat (i.e. Oracle, Mandrake, Sun JDS...) have |
|
4472884d8b37
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2107 // their own specific XXX-release file as well as a redhat-release file. |
|
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|
2108 // Because of this the XXX-release file needs to be searched for before the |
|
4472884d8b37
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|
2109 // redhat-release file. |
|
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|
2110 // Since Red Hat has a lsb-release file that is not very descriptive the |
|
4472884d8b37
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|
2111 // search for redhat-release needs to be before lsb-release. |
|
4472884d8b37
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|
2112 // Since the lsb-release file is the new standard it needs to be searched |
|
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|
2113 // before the older style release files. |
|
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|
2114 // Searching system-release (Red Hat) and os-release (other Linuxes) are a |
|
4472884d8b37
6986195: correctly identify Ubuntu as the operating system in crash report instead of "Debian"
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|
2115 // next to last resort. The os-release file is a new standard that contains |
|
4472884d8b37
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|
2116 // distribution information and the system-release file seems to be an old |
|
4472884d8b37
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2117 // standard that has been replaced by the lsb-release and os-release files. |
|
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|
2118 // Searching for the debian_version file is the last resort. It contains |
|
4472884d8b37
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|
2119 // an informative string like "6.0.6" or "wheezy/sid". Because of this |
|
4472884d8b37
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|
2120 // "Debian " is printed before the contents of the debian_version file. |
|
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|
2121 void os::Linux::print_distro_info(outputStream* st) { |
|
12212
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|
2122 if (!_print_ascii_file("/etc/oracle-release", st) && |
|
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|
2123 !_print_ascii_file("/etc/mandriva-release", st) && |
|
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|
2124 !_print_ascii_file("/etc/mandrake-release", st) && |
|
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|
2125 !_print_ascii_file("/etc/sun-release", st) && |
|
4472884d8b37
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|
2126 !_print_ascii_file("/etc/redhat-release", st) && |
|
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|
2127 !_print_ascii_file("/etc/lsb-release", st) && |
|
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|
2128 !_print_ascii_file("/etc/SuSE-release", st) && |
|
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|
2129 !_print_ascii_file("/etc/turbolinux-release", st) && |
|
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|
2130 !_print_ascii_file("/etc/gentoo-release", st) && |
|
4472884d8b37
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|
2131 !_print_ascii_file("/etc/ltib-release", st) && |
|
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|
2132 !_print_ascii_file("/etc/angstrom-version", st) && |
|
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|
2133 !_print_ascii_file("/etc/system-release", st) && |
|
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|
2134 !_print_ascii_file("/etc/os-release", st)) { |
|
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|
2135 |
|
4472884d8b37
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|
2136 if (file_exists("/etc/debian_version")) { |
|
4472884d8b37
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|
2137 st->print("Debian "); |
|
4472884d8b37
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|
2138 _print_ascii_file("/etc/debian_version", st); |
|
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|
2139 } else { |
|
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|
2140 st->print("Linux"); |
|
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|
2141 } |
|
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|
2142 } |
|
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|
2143 st->cr(); |
|
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|
2144 } |
|
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|
2145 |
|
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|
2146 void os::Linux::print_libversion_info(outputStream* st) { |
| 0 | 2147 // libc, pthread |
| 2148 st->print("libc:"); | |
|
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|
2149 st->print("%s ", os::Linux::glibc_version()); |
|
78bbf4d43a14
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|
2150 st->print("%s ", os::Linux::libpthread_version()); |
| 0 | 2151 if (os::Linux::is_LinuxThreads()) { |
| 2152 st->print("(%s stack)", os::Linux::is_floating_stack() ? "floating" : "fixed"); | |
| 2153 } | |
| 2154 st->cr(); | |
|
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|
2155 } |
|
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|
2156 |
|
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|
2157 void os::Linux::print_full_memory_info(outputStream* st) { |
|
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|
2158 st->print("\n/proc/meminfo:\n"); |
|
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|
2159 _print_ascii_file("/proc/meminfo", st); |
|
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|
2160 st->cr(); |
|
3800
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3358
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|
2161 } |
|
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|
2162 |
| 0 | 2163 void os::print_memory_info(outputStream* st) { |
| 2164 | |
| 2165 st->print("Memory:"); | |
| 2166 st->print(" %dk page", os::vm_page_size()>>10); | |
| 2167 | |
| 2168 // values in struct sysinfo are "unsigned long" | |
| 2169 struct sysinfo si; | |
| 2170 sysinfo(&si); | |
| 2171 | |
| 2172 st->print(", physical " UINT64_FORMAT "k", | |
| 2173 os::physical_memory() >> 10); | |
| 2174 st->print("(" UINT64_FORMAT "k free)", | |
| 2175 os::available_memory() >> 10); | |
| 2176 st->print(", swap " UINT64_FORMAT "k", | |
| 2177 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
| 2178 st->print("(" UINT64_FORMAT "k free)", | |
| 2179 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
| 2180 st->cr(); | |
| 2181 } | |
| 2182 | |
|
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2183 void os::pd_print_cpu_info(outputStream* st) { |
|
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|
2184 st->print("\n/proc/cpuinfo:\n"); |
|
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|
2185 if (!_print_ascii_file("/proc/cpuinfo", st)) { |
|
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|
2186 st->print(" <Not Available>"); |
|
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|
2187 } |
|
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|
2188 st->cr(); |
|
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|
2189 } |
|
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|
2190 |
| 0 | 2191 void os::print_siginfo(outputStream* st, void* siginfo) { |
| 14410 | 2192 const siginfo_t* si = (const siginfo_t*)siginfo; |
| 2193 | |
| 2194 os::Posix::print_siginfo_brief(st, si); | |
|
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|
2195 #if INCLUDE_CDS |
| 14410 | 2196 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && |
| 0 | 2197 UseSharedSpaces) { |
| 2198 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 2199 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 2200 st->print("\n\nError accessing class data sharing archive." \ | |
| 2201 " Mapped file inaccessible during execution, " \ | |
| 2202 " possible disk/network problem."); | |
| 2203 } | |
| 2204 } | |
|
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|
2205 #endif |
| 0 | 2206 st->cr(); |
| 2207 } | |
| 2208 | |
| 2209 | |
| 2210 static void print_signal_handler(outputStream* st, int sig, | |
| 2211 char* buf, size_t buflen); | |
| 2212 | |
| 2213 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 2214 st->print_cr("Signal Handlers:"); | |
| 2215 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 2216 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 2217 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 2218 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 2219 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 2220 print_signal_handler(st, SIGILL , buf, buflen); | |
| 2221 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 2222 print_signal_handler(st, SR_signum, buf, buflen); | |
| 2223 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 2224 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 2225 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 2226 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
|
14432
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|
2227 #if defined(PPC64) |
|
935bf3340572
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|
2228 print_signal_handler(st, SIGTRAP, buf, buflen); |
|
935bf3340572
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|
2229 #endif |
| 0 | 2230 } |
| 2231 | |
| 2232 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 2233 | |
|
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7d42f3b08300
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|
2234 // Find the full path to the current module, libjvm.so |
| 1642 | 2235 void os::jvm_path(char *buf, jint buflen) { |
| 0 | 2236 // Error checking. |
| 1642 | 2237 if (buflen < MAXPATHLEN) { |
| 0 | 2238 assert(false, "must use a large-enough buffer"); |
| 2239 buf[0] = '\0'; | |
| 2240 return; | |
| 2241 } | |
| 2242 // Lazy resolve the path to current module. | |
| 2243 if (saved_jvm_path[0] != 0) { | |
| 2244 strcpy(buf, saved_jvm_path); | |
| 2245 return; | |
| 2246 } | |
| 2247 | |
| 2248 char dli_fname[MAXPATHLEN]; | |
| 2249 bool ret = dll_address_to_library_name( | |
| 2250 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 2251 dli_fname, sizeof(dli_fname), NULL); | |
|
11092
59b052799158
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diff
changeset
|
2252 assert(ret, "cannot locate libjvm"); |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2253 char *rp = NULL; |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2254 if (ret && dli_fname[0] != '\0') { |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2255 rp = realpath(dli_fname, buf); |
|
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
2256 } |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2257 if (rp == NULL) |
|
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2258 return; |
| 0 | 2259 |
|
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2204
diff
changeset
|
2260 if (Arguments::created_by_gamma_launcher()) { |
| 0 | 2261 // Support for the gamma launcher. Typical value for buf is |
| 2262 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at | |
| 2263 // the right place in the string, then assume we are installed in a JDK and | |
| 2264 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix | |
| 2265 // up the path so it looks like libjvm.so is installed there (append a | |
| 2266 // fake suffix hotspot/libjvm.so). | |
| 2267 const char *p = buf + strlen(buf) - 1; | |
| 2268 for (int count = 0; p > buf && count < 5; ++count) { | |
| 2269 for (--p; p > buf && *p != '/'; --p) | |
| 2270 /* empty */ ; | |
| 2271 } | |
| 2272 | |
| 2273 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 2274 // Look for JAVA_HOME in the environment. | |
| 2275 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 2276 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1642 | 2277 char* jrelib_p; |
| 2278 int len; | |
| 2279 | |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2280 // Check the current module name "libjvm.so". |
| 0 | 2281 p = strrchr(buf, '/'); |
| 2282 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 2283 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2284 rp = realpath(java_home_var, buf); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2285 if (rp == NULL) |
|
513
2328d1d3f8cf
6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2286 return; |
| 1642 | 2287 |
| 2288 // determine if this is a legacy image or modules image | |
| 2289 // modules image doesn't have "jre" subdirectory | |
| 2290 len = strlen(buf); | |
| 17567 | 2291 assert(len < buflen, "Ran out of buffer room"); |
| 1642 | 2292 jrelib_p = buf + len; |
| 2293 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); | |
| 2294 if (0 != access(buf, F_OK)) { | |
| 2295 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); | |
| 2296 } | |
| 2297 | |
| 0 | 2298 if (0 == access(buf, F_OK)) { |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2299 // Use current module name "libjvm.so" |
| 1642 | 2300 len = strlen(buf); |
|
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
parents:
7206
diff
changeset
|
2301 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); |
| 0 | 2302 } else { |
| 2303 // Go back to path of .so | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2304 rp = realpath(dli_fname, buf); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
2305 if (rp == NULL) |
|
513
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6781583: Hotspot build fails on linux 64 bit platform with gcc 4.3.2
xlu
parents:
477
diff
changeset
|
2306 return; |
| 0 | 2307 } |
| 2308 } | |
| 2309 } | |
| 2310 } | |
| 2311 | |
| 17567 | 2312 strncpy(saved_jvm_path, buf, MAXPATHLEN); |
| 0 | 2313 } |
| 2314 | |
| 2315 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 2316 // no prefix required, not even "_" | |
| 2317 } | |
| 2318 | |
| 2319 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 2320 // no suffix required | |
| 2321 } | |
| 2322 | |
| 2323 //////////////////////////////////////////////////////////////////////////////// | |
| 2324 // sun.misc.Signal support | |
| 2325 | |
| 2326 static volatile jint sigint_count = 0; | |
| 2327 | |
| 2328 static void | |
| 2329 UserHandler(int sig, void *siginfo, void *context) { | |
| 2330 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 2331 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 2332 // don't want to flood the manager thread with sem_post requests. | |
| 2333 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 2334 return; | |
| 2335 | |
| 2336 // Ctrl-C is pressed during error reporting, likely because the error | |
| 2337 // handler fails to abort. Let VM die immediately. | |
| 2338 if (sig == SIGINT && is_error_reported()) { | |
| 2339 os::die(); | |
| 2340 } | |
| 2341 | |
| 2342 os::signal_notify(sig); | |
| 2343 } | |
| 2344 | |
| 2345 void* os::user_handler() { | |
| 2346 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 2347 } | |
| 2348 | |
| 10405 | 2349 class Semaphore : public StackObj { |
| 2350 public: | |
| 2351 Semaphore(); | |
| 2352 ~Semaphore(); | |
| 2353 void signal(); | |
| 2354 void wait(); | |
| 2355 bool trywait(); | |
| 2356 bool timedwait(unsigned int sec, int nsec); | |
| 2357 private: | |
| 2358 sem_t _semaphore; | |
| 2359 }; | |
| 2360 | |
| 2361 Semaphore::Semaphore() { | |
| 2362 sem_init(&_semaphore, 0, 0); | |
| 2363 } | |
| 2364 | |
| 2365 Semaphore::~Semaphore() { | |
| 2366 sem_destroy(&_semaphore); | |
| 2367 } | |
| 2368 | |
| 2369 void Semaphore::signal() { | |
| 2370 sem_post(&_semaphore); | |
| 2371 } | |
| 2372 | |
| 2373 void Semaphore::wait() { | |
| 2374 sem_wait(&_semaphore); | |
| 2375 } | |
| 2376 | |
| 2377 bool Semaphore::trywait() { | |
| 2378 return sem_trywait(&_semaphore) == 0; | |
| 2379 } | |
| 2380 | |
| 2381 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 17738 | 2382 |
| 10405 | 2383 struct timespec ts; |
| 17738 | 2384 // Semaphore's are always associated with CLOCK_REALTIME |
| 2385 os::Linux::clock_gettime(CLOCK_REALTIME, &ts); | |
| 2386 // see unpackTime for discussion on overflow checking | |
| 2387 if (sec >= MAX_SECS) { | |
| 2388 ts.tv_sec += MAX_SECS; | |
| 2389 ts.tv_nsec = 0; | |
| 2390 } else { | |
| 2391 ts.tv_sec += sec; | |
| 2392 ts.tv_nsec += nsec; | |
| 2393 if (ts.tv_nsec >= NANOSECS_PER_SEC) { | |
| 2394 ts.tv_nsec -= NANOSECS_PER_SEC; | |
| 2395 ++ts.tv_sec; // note: this must be <= max_secs | |
| 2396 } | |
| 2397 } | |
| 10405 | 2398 |
| 2399 while (1) { | |
| 2400 int result = sem_timedwait(&_semaphore, &ts); | |
| 2401 if (result == 0) { | |
| 2402 return true; | |
| 2403 } else if (errno == EINTR) { | |
| 2404 continue; | |
| 2405 } else if (errno == ETIMEDOUT) { | |
| 2406 return false; | |
| 2407 } else { | |
| 2408 return false; | |
| 2409 } | |
| 2410 } | |
| 2411 } | |
| 2412 | |
| 0 | 2413 extern "C" { |
| 2414 typedef void (*sa_handler_t)(int); | |
| 2415 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 2416 } | |
| 2417 | |
| 2418 void* os::signal(int signal_number, void* handler) { | |
| 2419 struct sigaction sigAct, oldSigAct; | |
| 2420 | |
| 2421 sigfillset(&(sigAct.sa_mask)); | |
| 2422 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2423 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 2424 | |
| 2425 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 2426 // -1 means registration failed | |
| 2427 return (void *)-1; | |
| 2428 } | |
| 2429 | |
| 2430 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 2431 } | |
| 2432 | |
| 2433 void os::signal_raise(int signal_number) { | |
| 2434 ::raise(signal_number); | |
| 2435 } | |
| 2436 | |
| 2437 /* | |
| 2438 * The following code is moved from os.cpp for making this | |
| 2439 * code platform specific, which it is by its very nature. | |
| 2440 */ | |
| 2441 | |
| 2442 // Will be modified when max signal is changed to be dynamic | |
| 2443 int os::sigexitnum_pd() { | |
| 2444 return NSIG; | |
| 2445 } | |
| 2446 | |
| 2447 // a counter for each possible signal value | |
| 2448 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 2449 | |
| 2450 // Linux(POSIX) specific hand shaking semaphore. | |
| 2451 static sem_t sig_sem; | |
| 10405 | 2452 static Semaphore sr_semaphore; |
| 0 | 2453 |
| 2454 void os::signal_init_pd() { | |
| 2455 // Initialize signal structures | |
| 2456 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 2457 | |
| 2458 // Initialize signal semaphore | |
| 2459 ::sem_init(&sig_sem, 0, 0); | |
| 2460 } | |
| 2461 | |
| 2462 void os::signal_notify(int sig) { | |
| 2463 Atomic::inc(&pending_signals[sig]); | |
| 2464 ::sem_post(&sig_sem); | |
| 2465 } | |
| 2466 | |
| 2467 static int check_pending_signals(bool wait) { | |
| 2468 Atomic::store(0, &sigint_count); | |
| 2469 for (;;) { | |
| 2470 for (int i = 0; i < NSIG + 1; i++) { | |
| 2471 jint n = pending_signals[i]; | |
| 2472 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 2473 return i; | |
| 2474 } | |
| 2475 } | |
| 2476 if (!wait) { | |
| 2477 return -1; | |
| 2478 } | |
| 2479 JavaThread *thread = JavaThread::current(); | |
| 2480 ThreadBlockInVM tbivm(thread); | |
| 2481 | |
| 2482 bool threadIsSuspended; | |
| 2483 do { | |
| 2484 thread->set_suspend_equivalent(); | |
| 2485 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 2486 ::sem_wait(&sig_sem); | |
| 2487 | |
| 2488 // were we externally suspended while we were waiting? | |
| 2489 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2490 if (threadIsSuspended) { | |
| 2491 // | |
| 2492 // The semaphore has been incremented, but while we were waiting | |
| 2493 // another thread suspended us. We don't want to continue running | |
| 2494 // while suspended because that would surprise the thread that | |
| 2495 // suspended us. | |
| 2496 // | |
| 2497 ::sem_post(&sig_sem); | |
| 2498 | |
| 2499 thread->java_suspend_self(); | |
| 2500 } | |
| 2501 } while (threadIsSuspended); | |
| 2502 } | |
| 2503 } | |
| 2504 | |
| 2505 int os::signal_lookup() { | |
| 2506 return check_pending_signals(false); | |
| 2507 } | |
| 2508 | |
| 2509 int os::signal_wait() { | |
| 2510 return check_pending_signals(true); | |
| 2511 } | |
| 2512 | |
| 2513 //////////////////////////////////////////////////////////////////////////////// | |
| 2514 // Virtual Memory | |
| 2515 | |
| 2516 int os::vm_page_size() { | |
| 2517 // Seems redundant as all get out | |
| 2518 assert(os::Linux::page_size() != -1, "must call os::init"); | |
| 2519 return os::Linux::page_size(); | |
| 2520 } | |
| 2521 | |
| 2522 // Solaris allocates memory by pages. | |
| 2523 int os::vm_allocation_granularity() { | |
| 2524 assert(os::Linux::page_size() != -1, "must call os::init"); | |
| 2525 return os::Linux::page_size(); | |
| 2526 } | |
| 2527 | |
| 2528 // Rationale behind this function: | |
| 2529 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2530 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2531 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2532 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2533 // info for the reporting script by storing timestamp and location of symbol | |
| 2534 void linux_wrap_code(char* base, size_t size) { | |
| 2535 static volatile jint cnt = 0; | |
| 2536 | |
| 2537 if (!UseOprofile) { | |
| 2538 return; | |
| 2539 } | |
| 2540 | |
|
1497
96d554193f72
6944822: Fix for 6938627 exposes problem with hard-coded buffer sizes
coleenp
parents:
1353
diff
changeset
|
2541 char buf[PATH_MAX+1]; |
| 0 | 2542 int num = Atomic::add(1, &cnt); |
| 2543 | |
|
1353
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2544 snprintf(buf, sizeof(buf), "%s/hs-vm-%d-%d", |
|
a2ea687fdc7c
6938627: Make temporary directory use property java.io.tmpdir when specified
coleenp
parents:
1325
diff
changeset
|
2545 os::get_temp_directory(), os::current_process_id(), num); |
| 0 | 2546 unlink(buf); |
| 2547 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2548 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); |
| 0 | 2549 |
| 2550 if (fd != -1) { | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2551 off_t rv = ::lseek(fd, size-2, SEEK_SET); |
| 0 | 2552 if (rv != (off_t)-1) { |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2553 if (::write(fd, "", 1) == 1) { |
| 0 | 2554 mmap(base, size, |
| 2555 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2556 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2557 } | |
| 2558 } | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
2559 ::close(fd); |
| 0 | 2560 unlink(buf); |
| 2561 } | |
| 2562 } | |
| 2563 | |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2564 static bool recoverable_mmap_error(int err) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2565 // See if the error is one we can let the caller handle. This |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2566 // list of errno values comes from JBS-6843484. I can't find a |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2567 // Linux man page that documents this specific set of errno |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2568 // values so while this list currently matches Solaris, it may |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2569 // change as we gain experience with this failure mode. |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2570 switch (err) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2571 case EBADF: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2572 case EINVAL: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2573 case ENOTSUP: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2574 // let the caller deal with these errors |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2575 return true; |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2576 |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2577 default: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2578 // Any remaining errors on this OS can cause our reserved mapping |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2579 // to be lost. That can cause confusion where different data |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2580 // structures think they have the same memory mapped. The worst |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2581 // scenario is if both the VM and a library think they have the |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2582 // same memory mapped. |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2583 return false; |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2584 } |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2585 } |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2586 |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2587 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2588 int err) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2589 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2590 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
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|
2591 strerror(err), err); |
|
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|
2592 } |
|
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|
2593 |
|
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2594 static void warn_fail_commit_memory(char* addr, size_t size, |
|
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|
2595 size_t alignment_hint, bool exec, |
|
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2596 int err) { |
|
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|
2597 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
|
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|
2598 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, size, |
|
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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|
2599 alignment_hint, exec, strerror(err), err); |
|
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|
2600 } |
|
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|
2601 |
| 0 | 2602 // NOTE: Linux kernel does not really reserve the pages for us. |
| 2603 // All it does is to check if there are enough free pages | |
| 2604 // left at the time of mmap(). This could be a potential | |
| 2605 // problem. | |
|
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|
2606 int os::Linux::commit_memory_impl(char* addr, size_t size, bool exec) { |
| 656 | 2607 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2608 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 0 | 2609 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); |
| 3885 | 2610 if (res != (uintptr_t) MAP_FAILED) { |
| 2611 if (UseNUMAInterleaving) { | |
| 2612 numa_make_global(addr, size); | |
| 2613 } | |
|
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|
2614 return 0; |
|
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|
2615 } |
|
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|
2616 |
|
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|
2617 int err = errno; // save errno from mmap() call above |
|
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|
2618 |
|
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|
2619 if (!recoverable_mmap_error(err)) { |
|
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|
2620 warn_fail_commit_memory(addr, size, exec, err); |
|
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|
2621 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "committing reserved memory."); |
|
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|
2622 } |
|
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|
2623 |
|
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|
2624 return err; |
|
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|
2625 } |
|
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|
2626 |
|
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changeset
|
2627 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
|
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|
2628 return os::Linux::commit_memory_impl(addr, size, exec) == 0; |
|
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|
2629 } |
|
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|
2630 |
|
a837fa3d3f86
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changeset
|
2631 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
|
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|
2632 const char* mesg) { |
|
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8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2633 assert(mesg != NULL, "mesg must be specified"); |
|
a837fa3d3f86
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changeset
|
2634 int err = os::Linux::commit_memory_impl(addr, size, exec); |
|
a837fa3d3f86
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changeset
|
2635 if (err != 0) { |
|
a837fa3d3f86
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changeset
|
2636 // the caller wants all commit errors to exit with the specified mesg: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2637 warn_fail_commit_memory(addr, size, exec, err); |
|
a837fa3d3f86
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changeset
|
2638 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
|
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changeset
|
2639 } |
| 0 | 2640 } |
| 2641 | |
|
3286
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diff
changeset
|
2642 // Define MAP_HUGETLB here so we can build HotSpot on old systems. |
|
139667d9836a
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|
2643 #ifndef MAP_HUGETLB |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2644 #define MAP_HUGETLB 0x40000 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
2645 #endif |
|
139667d9836a
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diff
changeset
|
2646 |
|
139667d9836a
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diff
changeset
|
2647 // 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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|
2648 #ifndef MADV_HUGEPAGE |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
2649 #define MADV_HUGEPAGE 14 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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2302
diff
changeset
|
2650 #endif |
|
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2651 |
|
10969
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changeset
|
2652 int os::Linux::commit_memory_impl(char* addr, size_t size, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2653 size_t alignment_hint, bool exec) { |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
2654 int err = os::Linux::commit_memory_impl(addr, size, exec); |
|
10969
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changeset
|
2655 if (err == 0) { |
|
3913
27702f012017
7087583: Hotspot fails to allocate heap with mmap(MAP_HUGETLB)
iveresov
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3887
diff
changeset
|
2656 realign_memory(addr, size, alignment_hint); |
|
10969
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changeset
|
2657 } |
|
a837fa3d3f86
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changeset
|
2658 return err; |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2659 } |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2660 |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2661 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2662 bool exec) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2663 return os::Linux::commit_memory_impl(addr, size, alignment_hint, exec) == 0; |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2664 } |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2665 |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2666 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2667 size_t alignment_hint, bool exec, |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2668 const char* mesg) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2669 assert(mesg != NULL, "mesg must be specified"); |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2670 int err = os::Linux::commit_memory_impl(addr, size, alignment_hint, exec); |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2671 if (err != 0) { |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2672 // the caller wants all commit errors to exit with the specified mesg: |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2673 warn_fail_commit_memory(addr, size, alignment_hint, exec, err); |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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changeset
|
2674 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
|
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
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diff
changeset
|
2675 } |
| 0 | 2676 } |
| 2677 | |
| 6197 | 2678 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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changeset
|
2679 if (UseTransparentHugePages && alignment_hint > (size_t)vm_page_size()) { |
|
3286
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diff
changeset
|
2680 // We don't check the return value: madvise(MADV_HUGEPAGE) may not |
|
139667d9836a
7034464: Support transparent large pages on Linux
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diff
changeset
|
2681 // be supported or the memory may already be backed by huge pages. |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
2682 ::madvise(addr, bytes, MADV_HUGEPAGE); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
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diff
changeset
|
2683 } |
|
139667d9836a
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diff
changeset
|
2684 } |
| 141 | 2685 |
| 6197 | 2686 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
|
5937
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
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5909
diff
changeset
|
2687 // This method works by doing an mmap over an existing mmaping and effectively discarding |
|
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
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5909
diff
changeset
|
2688 // the existing pages. However it won't work for SHM-based large pages that cannot be |
|
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
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5909
diff
changeset
|
2689 // uncommitted at all. We don't do anything in this case to avoid creating a segment with |
|
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
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5909
diff
changeset
|
2690 // small pages on top of the SHM segment. This method always works for small pages, so we |
|
cf956638b844
7151089: PS NUMA: NUMA allocator should not attempt to free pages when using SHM large pages
iveresov
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5909
diff
changeset
|
2691 // allow that in any case. |
|
12110
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stefank
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changeset
|
2692 if (alignment_hint <= (size_t)os::vm_page_size() || can_commit_large_page_memory()) { |
|
10969
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changeset
|
2693 commit_memory(addr, bytes, alignment_hint, !ExecMem); |
|
5937
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diff
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|
2694 } |
| 141 | 2695 } |
| 2696 | |
|
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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356
diff
changeset
|
2697 void os::numa_make_global(char *addr, size_t bytes) { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
2698 Linux::numa_interleave_memory(addr, bytes); |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
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diff
changeset
|
2699 } |
| 141 | 2700 |
|
12176
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diff
changeset
|
2701 // Define for numa_set_bind_policy(int). Setting the argument to 0 will set the |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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diff
changeset
|
2702 // bind policy to MPOL_PREFERRED for the current thread. |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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changeset
|
2703 #define USE_MPOL_PREFERRED 0 |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
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diff
changeset
|
2704 |
| 141 | 2705 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { |
|
12176
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diff
changeset
|
2706 // To make NUMA and large pages more robust when both enabled, we need to ease |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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diff
changeset
|
2707 // the requirements on where the memory should be allocated. MPOL_BIND is the |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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diff
changeset
|
2708 // default policy and it will force memory to be allocated on the specified |
|
88c255656030
8016155: SIGBUS when running Kitchensink with ParallelScavenge and ParallelOld
mgerdin
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changeset
|
2709 // node. Changing this to MPOL_PREFERRED will prefer to allocate the memory on |
|
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|
2710 // the specified node, but will not force it. Using this policy will prevent |
|
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|
2711 // getting SIGBUS when trying to allocate large pages on NUMA nodes with no |
|
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|
2712 // free large pages. |
|
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|
2713 Linux::numa_set_bind_policy(USE_MPOL_PREFERRED); |
| 141 | 2714 Linux::numa_tonode_memory(addr, bytes, lgrp_hint); |
| 2715 } | |
| 2716 | |
| 2717 bool os::numa_topology_changed() { return false; } | |
| 2718 | |
| 2719 size_t os::numa_get_groups_num() { | |
| 2720 int max_node = Linux::numa_max_node(); | |
| 2721 return max_node > 0 ? max_node + 1 : 1; | |
| 2722 } | |
| 2723 | |
| 2724 int os::numa_get_group_id() { | |
| 2725 int cpu_id = Linux::sched_getcpu(); | |
| 2726 if (cpu_id != -1) { | |
| 2727 int lgrp_id = Linux::get_node_by_cpu(cpu_id); | |
| 2728 if (lgrp_id != -1) { | |
| 2729 return lgrp_id; | |
| 2730 } | |
| 0 | 2731 } |
| 2732 return 0; | |
| 2733 } | |
| 2734 | |
| 141 | 2735 size_t os::numa_get_leaf_groups(int *ids, size_t size) { |
| 2736 for (size_t i = 0; i < size; i++) { | |
| 2737 ids[i] = i; | |
| 2738 } | |
| 2739 return size; | |
| 2740 } | |
| 2741 | |
| 0 | 2742 bool os::get_page_info(char *start, page_info* info) { |
| 2743 return false; | |
| 2744 } | |
| 2745 | |
| 2746 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2747 return end; | |
| 2748 } | |
| 2749 | |
| 3826 | 2750 |
| 2751 int os::Linux::sched_getcpu_syscall(void) { | |
| 2752 unsigned int cpu; | |
| 2753 int retval = -1; | |
| 2754 | |
| 2755 #if defined(IA32) | |
|
3887
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|
2756 # ifndef SYS_getcpu |
|
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2757 # define SYS_getcpu 318 |
|
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|
2758 # endif |
| 3826 | 2759 retval = syscall(SYS_getcpu, &cpu, NULL, NULL); |
| 2760 #elif defined(AMD64) | |
|
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|
2761 // Unfortunately we have to bring all these macros here from vsyscall.h |
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|
2762 // to be able to compile on old linuxes. |
|
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|
2763 # define __NR_vgetcpu 2 |
|
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|
2764 # define VSYSCALL_START (-10UL << 20) |
|
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|
2765 # define VSYSCALL_SIZE 1024 |
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2766 # define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr)) |
| 3826 | 2767 typedef long (*vgetcpu_t)(unsigned int *cpu, unsigned int *node, unsigned long *tcache); |
| 2768 vgetcpu_t vgetcpu = (vgetcpu_t)VSYSCALL_ADDR(__NR_vgetcpu); | |
| 2769 retval = vgetcpu(&cpu, NULL, NULL); | |
| 2770 #endif | |
| 2771 | |
| 2772 return (retval == -1) ? retval : cpu; | |
| 2773 } | |
| 2774 | |
| 2191 | 2775 // Something to do with the numa-aware allocator needs these symbols |
| 2776 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
| 2777 extern "C" JNIEXPORT void numa_error(char *where) { } | |
| 2778 extern "C" JNIEXPORT int fork1() { return fork(); } | |
| 141 | 2779 |
|
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|
2780 |
|
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|
2781 // If we are running with libnuma version > 2, then we should |
|
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|
2782 // be trying to use symbols with versions 1.1 |
|
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|
2783 // If we are running with earlier version, which did not have symbol versions, |
|
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|
2784 // we should use the base version. |
|
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|
2785 void* os::Linux::libnuma_dlsym(void* handle, const char *name) { |
|
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|
2786 void *f = dlvsym(handle, name, "libnuma_1.1"); |
|
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|
2787 if (f == NULL) { |
|
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|
2788 f = dlsym(handle, name); |
|
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|
2789 } |
|
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|
2790 return f; |
|
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|
2791 } |
|
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|
2792 |
|
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|
2793 bool os::Linux::libnuma_init() { |
| 141 | 2794 // sched_getcpu() should be in libc. |
| 2795 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
| 2796 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
| 2797 | |
| 3826 | 2798 // If it's not, try a direct syscall. |
| 2799 if (sched_getcpu() == -1) | |
| 2800 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, (void*)&sched_getcpu_syscall)); | |
| 2801 | |
| 141 | 2802 if (sched_getcpu() != -1) { // Does it work? |
|
267
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|
2803 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); |
| 141 | 2804 if (handle != NULL) { |
| 2805 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
|
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|
2806 libnuma_dlsym(handle, "numa_node_to_cpus"))); |
| 141 | 2807 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, |
|
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|
2808 libnuma_dlsym(handle, "numa_max_node"))); |
| 141 | 2809 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, |
|
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|
2810 libnuma_dlsym(handle, "numa_available"))); |
| 141 | 2811 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, |
|
763
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|
2812 libnuma_dlsym(handle, "numa_tonode_memory"))); |
|
462
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|
2813 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, |
|
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|
2814 libnuma_dlsym(handle, "numa_interleave_memory"))); |
|
12176
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|
2815 set_numa_set_bind_policy(CAST_TO_FN_PTR(numa_set_bind_policy_func_t, |
|
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|
2816 libnuma_dlsym(handle, "numa_set_bind_policy"))); |
|
462
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|
2817 |
|
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|
2818 |
| 141 | 2819 if (numa_available() != -1) { |
|
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|
2820 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); |
| 141 | 2821 // Create a cpu -> node mapping |
| 6197 | 2822 _cpu_to_node = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<int>(0, true); |
| 141 | 2823 rebuild_cpu_to_node_map(); |
|
462
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|
2824 return true; |
| 141 | 2825 } |
| 2826 } | |
| 2827 } | |
|
462
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|
2828 return false; |
| 141 | 2829 } |
| 2830 | |
| 2831 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
| 2832 // The table is later used in get_node_by_cpu(). | |
| 2833 void os::Linux::rebuild_cpu_to_node_map() { | |
|
462
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|
2834 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure |
|
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|
2835 // in libnuma (possible values are starting from 16, |
|
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|
2836 // and continuing up with every other power of 2, but less |
|
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|
2837 // than the maximum number of CPUs supported by kernel), and |
|
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|
2838 // is a subject to change (in libnuma version 2 the requirements |
|
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|
2839 // are more reasonable) we'll just hardcode the number they use |
|
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|
2840 // in the library. |
|
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|
2841 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; |
|
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|
2842 |
|
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|
2843 size_t cpu_num = os::active_processor_count(); |
|
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|
2844 size_t cpu_map_size = NCPUS / BitsPerCLong; |
|
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|
2845 size_t cpu_map_valid_size = |
|
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|
2846 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); |
|
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|
2847 |
| 141 | 2848 cpu_to_node()->clear(); |
| 2849 cpu_to_node()->at_grow(cpu_num - 1); | |
|
462
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|
2850 size_t node_num = numa_get_groups_num(); |
|
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|
2851 |
| 6197 | 2852 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size, mtInternal); |
|
462
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|
2853 for (size_t i = 0; i < node_num; i++) { |
| 141 | 2854 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { |
|
462
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|
2855 for (size_t j = 0; j < cpu_map_valid_size; j++) { |
| 141 | 2856 if (cpu_map[j] != 0) { |
|
462
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|
2857 for (size_t k = 0; k < BitsPerCLong; k++) { |
| 141 | 2858 if (cpu_map[j] & (1UL << k)) { |
|
462
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|
2859 cpu_to_node()->at_put(j * BitsPerCLong + k, i); |
| 141 | 2860 } |
| 2861 } | |
| 2862 } | |
| 2863 } | |
| 2864 } | |
| 2865 } | |
| 6197 | 2866 FREE_C_HEAP_ARRAY(unsigned long, cpu_map, mtInternal); |
| 141 | 2867 } |
| 2868 | |
| 2869 int os::Linux::get_node_by_cpu(int cpu_id) { | |
| 2870 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
| 2871 return cpu_to_node()->at(cpu_id); | |
| 2872 } | |
| 2873 return -1; | |
| 2874 } | |
| 2875 | |
| 2876 GrowableArray<int>* os::Linux::_cpu_to_node; | |
| 2877 os::Linux::sched_getcpu_func_t os::Linux::_sched_getcpu; | |
| 2878 os::Linux::numa_node_to_cpus_func_t os::Linux::_numa_node_to_cpus; | |
| 2879 os::Linux::numa_max_node_func_t os::Linux::_numa_max_node; | |
| 2880 os::Linux::numa_available_func_t os::Linux::_numa_available; | |
| 2881 os::Linux::numa_tonode_memory_func_t os::Linux::_numa_tonode_memory; | |
|
462
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|
2882 os::Linux::numa_interleave_memory_func_t os::Linux::_numa_interleave_memory; |
|
12176
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|
2883 os::Linux::numa_set_bind_policy_func_t os::Linux::_numa_set_bind_policy; |
|
462
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|
2884 unsigned long* os::Linux::_numa_all_nodes; |
| 141 | 2885 |
| 6197 | 2886 bool os::pd_uncommit_memory(char* addr, size_t size) { |
|
1681
126ea7725993
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|
2887 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, |
|
126ea7725993
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|
2888 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); |
|
126ea7725993
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|
2889 return res != (uintptr_t) MAP_FAILED; |
| 0 | 2890 } |
| 2891 | |
|
12144
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|
2892 static |
|
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|
2893 address get_stack_commited_bottom(address bottom, size_t size) { |
|
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|
2894 address nbot = bottom; |
|
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|
2895 address ntop = bottom + size; |
|
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|
2896 |
|
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|
2897 size_t page_sz = os::vm_page_size(); |
|
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|
2898 unsigned pages = size / page_sz; |
|
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|
2899 |
|
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|
2900 unsigned char vec[1]; |
|
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|
2901 unsigned imin = 1, imax = pages + 1, imid; |
| 17765 | 2902 int mincore_return_value = 0; |
| 2903 | |
| 2904 assert(imin <= imax, "Unexpected page size"); | |
|
12144
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2905 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
2906 while (imin < imax) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2907 imid = (imax + imin) / 2; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2908 nbot = ntop - (imid * page_sz); |
|
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2909 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
2910 // Use a trick with mincore to check whether the page is mapped or not. |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2911 // mincore sets vec to 1 if page resides in memory and to 0 if page |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2912 // is swapped output but if page we are asking for is unmapped |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2913 // it returns -1,ENOMEM |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2914 mincore_return_value = mincore(nbot, page_sz, vec); |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2915 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2916 if (mincore_return_value == -1) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2917 // Page is not mapped go up |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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changeset
|
2918 // to find first mapped page |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2919 if (errno != EAGAIN) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2920 assert(errno == ENOMEM, "Unexpected mincore errno"); |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2921 imax = imid; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2922 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2923 } else { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2924 // Page is mapped go down |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2925 // to find first not mapped page |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2926 imin = imid + 1; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2927 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2928 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2929 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2930 nbot = nbot + page_sz; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2931 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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changeset
|
2932 // Adjust stack bottom one page up if last checked page is not mapped |
|
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8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
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changeset
|
2933 if (mincore_return_value == -1) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2934 nbot = nbot + page_sz; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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12110
diff
changeset
|
2935 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2936 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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changeset
|
2937 return nbot; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2938 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2939 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2940 |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2941 // Linux uses a growable mapping for the stack, and if the mapping for |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2942 // the stack guard pages is not removed when we detach a thread the |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2943 // stack cannot grow beyond the pages where the stack guard was |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2944 // mapped. If at some point later in the process the stack expands to |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2945 // that point, the Linux kernel cannot expand the stack any further |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2946 // because the guard pages are in the way, and a segfault occurs. |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2947 // |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2948 // However, it's essential not to split the stack region by unmapping |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2949 // a region (leaving a hole) that's already part of the stack mapping, |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2950 // so if the stack mapping has already grown beyond the guard pages at |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2951 // the time we create them, we have to truncate the stack mapping. |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2952 // So, we need to know the extent of the stack mapping when |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2953 // create_stack_guard_pages() is called. |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2954 |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2955 // We only need this for stacks that are growable: at the time of |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2956 // writing thread stacks don't use growable mappings (i.e. those |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2957 // creeated with MAP_GROWSDOWN), and aren't marked "[stack]", so this |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2958 // only applies to the main thread. |
|
2469
677234770800
7017193: Small memory leak in get_stack_bounds os::create_stack_guard_pages
dsamersoff
parents:
2302
diff
changeset
|
2959 |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2960 // If the (growable) stack mapping already extends beyond the point |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2961 // where we're going to put our guard pages, truncate the mapping at |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2962 // that point by munmap()ping it. This ensures that when we later |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2963 // munmap() the guard pages we don't leave a hole in the stack |
|
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2964 // mapping. This only affects the main/initial thread |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
2965 |
| 6197 | 2966 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
|
12144
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2967 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2968 if (os::Linux::is_initial_thread()) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2969 // As we manually grow stack up to bottom inside create_attached_thread(), |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2970 // it's likely that os::Linux::initial_thread_stack_bottom is mapped and |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2971 // we don't need to do anything special. |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2972 // Check it first, before calling heavy function. |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2973 uintptr_t stack_extent = (uintptr_t) os::Linux::initial_thread_stack_bottom(); |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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diff
changeset
|
2974 unsigned char vec[1]; |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2975 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2976 if (mincore((address)stack_extent, os::vm_page_size(), vec) == -1) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2977 // Fallback to slow path on all errors, including EAGAIN |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2978 stack_extent = (uintptr_t) get_stack_commited_bottom( |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2979 os::Linux::initial_thread_stack_bottom(), |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
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diff
changeset
|
2980 (size_t)addr - stack_extent); |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2981 } |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2982 |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2983 if (stack_extent < (uintptr_t)addr) { |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
parents:
12110
diff
changeset
|
2984 ::munmap((void*)stack_extent, (uintptr_t)(addr - stack_extent)); |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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changeset
|
2985 } |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2986 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2987 |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
2988 return os::commit_memory(addr, size, !ExecMem); |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2989 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2990 |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2991 // If this is a growable mapping, remove the guard pages entirely by |
|
1750
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2992 // munmap()ping them. If not, just call uncommit_memory(). This only |
|
c7004d700b49
6978641: Fix for 6929067 introduces additional overhead in thread creation/termination paths
dholmes
parents:
1681
diff
changeset
|
2993 // affects the main/initial thread, but guard against future OS changes |
|
12144
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dsamersoff
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diff
changeset
|
2994 // It's safe to always unmap guard pages for initial thread because we |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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changeset
|
2995 // always place it right after end of the mapped region |
|
d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
dsamersoff
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12110
diff
changeset
|
2996 |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
2997 bool os::remove_stack_guard_pages(char* addr, size_t size) { |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
2998 uintptr_t stack_extent, stack_base; |
|
12144
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dsamersoff
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|
2999 |
|
d8e99408faad
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dsamersoff
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|
3000 if (os::Linux::is_initial_thread()) { |
|
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3001 return ::munmap(addr, size) == 0; |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3002 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3003 |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3004 return os::uncommit_memory(addr, size); |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1123
diff
changeset
|
3005 } |
|
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
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1123
diff
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|
3006 |
| 0 | 3007 static address _highest_vm_reserved_address = NULL; |
| 3008 | |
| 3009 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 3010 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 3011 // location, however, they will be overwritten. If 'fixed' is false, | |
| 3012 // 'requested_addr' is only treated as a hint, the return value may or | |
| 3013 // may not start from the requested address. Unlike Linux mmap(), this | |
| 3014 // function returns NULL to indicate failure. | |
| 3015 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 3016 char * addr; | |
| 3017 int flags; | |
| 3018 | |
| 3019 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 3020 if (fixed) { | |
| 3021 assert((uintptr_t)requested_addr % os::Linux::page_size() == 0, "unaligned address"); | |
| 3022 flags |= MAP_FIXED; | |
| 3023 } | |
| 3024 | |
| 10157 | 3025 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| 3026 // touch an uncommitted page. Otherwise, the read/write might | |
| 3027 // succeed if we have enough swap space to back the physical page. | |
| 3028 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
| 0 | 3029 flags, -1, 0); |
| 3030 | |
| 3031 if (addr != MAP_FAILED) { | |
| 3032 // anon_mmap() should only get called during VM initialization, | |
| 3033 // don't need lock (actually we can skip locking even it can be called | |
| 3034 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 3035 // hint about the upper limit of non-stack memory regions.) | |
| 3036 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 3037 _highest_vm_reserved_address = (address)addr + bytes; | |
| 3038 } | |
| 3039 } | |
| 3040 | |
| 3041 return addr == MAP_FAILED ? NULL : addr; | |
| 3042 } | |
| 3043 | |
| 3044 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 3045 // regions above addr + size. If so, releasing a memory region only creates | |
| 3046 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 3047 // | |
| 3048 static int anon_munmap(char * addr, size_t size) { | |
| 3049 return ::munmap(addr, size) == 0; | |
| 3050 } | |
| 3051 | |
| 6197 | 3052 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 0 | 3053 size_t alignment_hint) { |
| 3054 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 3055 } | |
| 3056 | |
| 6197 | 3057 bool os::pd_release_memory(char* addr, size_t size) { |
| 0 | 3058 return anon_munmap(addr, size); |
| 3059 } | |
| 3060 | |
| 3061 static address highest_vm_reserved_address() { | |
| 3062 return _highest_vm_reserved_address; | |
| 3063 } | |
| 3064 | |
| 3065 static bool linux_mprotect(char* addr, size_t size, int prot) { | |
| 3066 // Linux wants the mprotect address argument to be page aligned. | |
| 3067 char* bottom = (char*)align_size_down((intptr_t)addr, os::Linux::page_size()); | |
| 3068 | |
| 3069 // According to SUSv3, mprotect() should only be used with mappings | |
| 3070 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 3071 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 3072 // protection of malloc'ed or statically allocated memory). Check the | |
| 3073 // caller if you hit this assert. | |
| 3074 assert(addr == bottom, "sanity check"); | |
| 3075 | |
| 3076 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Linux::page_size()); | |
| 3077 return ::mprotect(bottom, size, prot) == 0; | |
| 3078 } | |
| 3079 | |
|
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3080 // Set protections specified |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3081 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3082 bool is_committed) { |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3083 unsigned int p = 0; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3084 switch (prot) { |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3085 case MEM_PROT_NONE: p = PROT_NONE; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3086 case MEM_PROT_READ: p = PROT_READ; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3087 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3088 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
|
3089 default: |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3090 ShouldNotReachHere(); |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3091 } |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3092 // is_committed is unused. |
|
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
3093 return linux_mprotect(addr, bytes, p); |
| 0 | 3094 } |
| 3095 | |
| 3096 bool os::guard_memory(char* addr, size_t size) { | |
| 3097 return linux_mprotect(addr, size, PROT_NONE); | |
| 3098 } | |
| 3099 | |
| 3100 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
|
3101 return linux_mprotect(addr, size, PROT_READ|PROT_WRITE); |
| 0 | 3102 } |
| 3103 | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3104 bool os::Linux::transparent_huge_pages_sanity_check(bool warn, size_t page_size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3105 bool result = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3106 void *p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3107 MAP_ANONYMOUS|MAP_PRIVATE, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3108 -1, 0); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3109 if (p != MAP_FAILED) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3110 void *aligned_p = align_ptr_up(p, page_size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3111 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3112 result = madvise(aligned_p, page_size, MADV_HUGEPAGE) == 0; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3113 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3114 munmap(p, page_size * 2); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3115 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3116 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3117 if (warn && !result) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3118 warning("TransparentHugePages is not supported by the operating system."); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3119 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3120 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3121 return result; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3122 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3123 |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3124 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
|
3125 bool result = false; |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3126 void *p = mmap(NULL, page_size, PROT_READ|PROT_WRITE, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3127 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3128 -1, 0); |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3129 |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3130 if (p != MAP_FAILED) { |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3131 // 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
|
3132 FILE *fp = fopen("/proc/self/maps", "r"); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3133 if (fp) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3134 while (!feof(fp)) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3135 char chars[257]; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3136 long x = 0; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3137 if (fgets(chars, sizeof(chars), fp)) { |
| 3358 | 3138 if (sscanf(chars, "%lx-%*x", &x) == 1 |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3139 && x == (long)p) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3140 if (strstr (chars, "hugepage")) { |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3141 result = true; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3142 break; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3143 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3144 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3145 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3146 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3147 fclose(fp); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3148 } |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3149 munmap(p, page_size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3150 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3151 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3152 if (warn && !result) { |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3153 warning("HugeTLBFS is not supported by the operating system."); |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3154 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3155 |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3156 return result; |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3157 } |
|
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3158 |
|
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3159 /* |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3160 * 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
|
3161 * |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3162 * From the coredump_filter documentation: |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3163 * |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3164 * - (bit 0) anonymous private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3165 * - (bit 1) anonymous shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3166 * - (bit 2) file-backed private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3167 * - (bit 3) file-backed shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3168 * - (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
|
3169 * effective only if the bit 2 is cleared) |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3170 * - (bit 5) hugetlb private memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3171 * - (bit 6) hugetlb shared memory |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3172 */ |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3173 static void set_coredump_filter(void) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3174 FILE *f; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3175 long cdm; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3176 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3177 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3178 return; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3179 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3180 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3181 if (fscanf(f, "%lx", &cdm) != 1) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3182 fclose(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3183 return; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3184 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3185 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3186 rewind(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3187 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3188 if ((cdm & LARGEPAGES_BIT) == 0) { |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3189 cdm |= LARGEPAGES_BIT; |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3190 fprintf(f, "%#lx", cdm); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3191 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3192 |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3193 fclose(f); |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3194 } |
|
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3195 |
| 0 | 3196 // Large page support |
| 3197 | |
| 3198 static size_t _large_page_size = 0; | |
| 3199 | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3200 size_t os::Linux::find_large_page_size() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3201 size_t large_page_size = 0; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3202 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3203 // large_page_size on Linux is used to round up heap size. x86 uses either |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3204 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3205 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3206 // page as large as 256M. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3207 // |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3208 // Here we try to figure out page size by parsing /proc/meminfo and looking |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3209 // for a line with the following format: |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3210 // Hugepagesize: 2048 kB |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3211 // |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3212 // If we can't determine the value (e.g. /proc is not mounted, or the text |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3213 // format has been changed), we'll use the largest page size supported by |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3214 // the processor. |
| 0 | 3215 |
| 1010 | 3216 #ifndef ZERO |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3217 large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3218 ARM_ONLY(2 * M) PPC_ONLY(4 * M); |
| 1010 | 3219 #endif // ZERO |
| 0 | 3220 |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3221 FILE *fp = fopen("/proc/meminfo", "r"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3222 if (fp) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3223 while (!feof(fp)) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3224 int x = 0; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3225 char buf[16]; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3226 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3227 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3228 large_page_size = x * K; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3229 break; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3230 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3231 } else { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3232 // skip to next line |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3233 for (;;) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3234 int ch = fgetc(fp); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3235 if (ch == EOF || ch == (int)'\n') break; |
| 0 | 3236 } |
| 3237 } | |
| 3238 } | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3239 fclose(fp); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3240 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3241 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3242 if (!FLAG_IS_DEFAULT(LargePageSizeInBytes) && LargePageSizeInBytes != large_page_size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3243 warning("Setting LargePageSizeInBytes has no effect on this OS. Large page size is " |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3244 SIZE_FORMAT "%s.", byte_size_in_proper_unit(large_page_size), |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3245 proper_unit_for_byte_size(large_page_size)); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3246 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3247 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3248 return large_page_size; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3249 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3250 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3251 size_t os::Linux::setup_large_page_size() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3252 _large_page_size = Linux::find_large_page_size(); |
| 0 | 3253 const size_t default_page_size = (size_t)Linux::page_size(); |
| 3254 if (_large_page_size > default_page_size) { | |
| 3255 _page_sizes[0] = _large_page_size; | |
| 3256 _page_sizes[1] = default_page_size; | |
| 3257 _page_sizes[2] = 0; | |
| 3258 } | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3259 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3260 return _large_page_size; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3261 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3262 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3263 bool os::Linux::setup_large_page_type(size_t page_size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3264 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3265 FLAG_IS_DEFAULT(UseSHM) && |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3266 FLAG_IS_DEFAULT(UseTransparentHugePages)) { |
|
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3267 |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3268 // The type of large pages has not been specified by the user. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3269 |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3270 // Try UseHugeTLBFS and then UseSHM. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3271 UseHugeTLBFS = UseSHM = true; |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3272 |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3273 // Don't try UseTransparentHugePages since there are known |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3274 // performance issues with it turned on. This might change in the future. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3275 UseTransparentHugePages = false; |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3276 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3277 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3278 if (UseTransparentHugePages) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3279 bool warn_on_failure = !FLAG_IS_DEFAULT(UseTransparentHugePages); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3280 if (transparent_huge_pages_sanity_check(warn_on_failure, page_size)) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3281 UseHugeTLBFS = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3282 UseSHM = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3283 return true; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3284 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3285 UseTransparentHugePages = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3286 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3287 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3288 if (UseHugeTLBFS) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3289 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3290 if (hugetlbfs_sanity_check(warn_on_failure, page_size)) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3291 UseSHM = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3292 return true; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3293 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3294 UseHugeTLBFS = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3295 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3296 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3297 return UseSHM; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3298 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3299 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3300 void os::large_page_init() { |
|
12832
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3301 if (!UseLargePages && |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3302 !UseTransparentHugePages && |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3303 !UseHugeTLBFS && |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3304 !UseSHM) { |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3305 // Not using large pages. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3306 return; |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3307 } |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3308 |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3309 if (!FLAG_IS_DEFAULT(UseLargePages) && !UseLargePages) { |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3310 // The user explicitly turned off large pages. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3311 // Ignore the rest of the large pages flags. |
|
263f2c796d6c
8024838: Significant slowdown due to transparent huge pages
stefank
parents:
12252
diff
changeset
|
3312 UseTransparentHugePages = false; |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3313 UseHugeTLBFS = false; |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3314 UseSHM = false; |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3315 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3316 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3317 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3318 size_t large_page_size = Linux::setup_large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3319 UseLargePages = Linux::setup_large_page_type(large_page_size); |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3320 |
|
2204
63d374c54045
7014918: Improve core/minidump handling in Hotspot
ctornqvi
parents:
2193
diff
changeset
|
3321 set_coredump_filter(); |
| 0 | 3322 } |
| 3323 | |
| 3324 #ifndef SHM_HUGETLB | |
| 3325 #define SHM_HUGETLB 04000 | |
| 3326 #endif | |
| 3327 | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3328 char* os::Linux::reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
| 656 | 3329 // "exec" is passed in but not used. Creating the shared image for |
| 3330 // the code cache doesn't have an SHM_X executable permission to check. | |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3331 assert(UseLargePages && UseSHM, "only for SHM large pages"); |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3332 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3333 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3334 if (!is_size_aligned(bytes, os::large_page_size()) || alignment > os::large_page_size()) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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parents:
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diff
changeset
|
3335 return NULL; // Fallback to small pages. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3336 } |
| 0 | 3337 |
| 3338 key_t key = IPC_PRIVATE; | |
| 3339 char *addr; | |
| 3340 | |
| 3341 bool warn_on_failure = UseLargePages && | |
| 3342 (!FLAG_IS_DEFAULT(UseLargePages) || | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3343 !FLAG_IS_DEFAULT(UseSHM) || |
| 0 | 3344 !FLAG_IS_DEFAULT(LargePageSizeInBytes) |
| 3345 ); | |
| 3346 char msg[128]; | |
| 3347 | |
| 3348 // Create a large shared memory region to attach to based on size. | |
| 3349 // Currently, size is the total size of the heap | |
| 3350 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
| 3351 if (shmid == -1) { | |
| 3352 // Possible reasons for shmget failure: | |
| 3353 // 1. shmmax is too small for Java heap. | |
| 3354 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 3355 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 3356 // 2. not enough large page memory. | |
| 3357 // > check available large pages: cat /proc/meminfo | |
| 3358 // > increase amount of large pages: | |
| 3359 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 3360 // Note 1: different Linux may use different name for this property, | |
| 3361 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 3362 // Note 2: it's possible there's enough physical memory available but | |
| 3363 // they are so fragmented after a long run that they can't | |
| 3364 // coalesce into large pages. Try to reserve large pages when | |
| 3365 // the system is still "fresh". | |
| 3366 if (warn_on_failure) { | |
| 3367 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3368 warning("%s", msg); |
| 0 | 3369 } |
| 3370 return NULL; | |
| 3371 } | |
| 3372 | |
| 3373 // attach to the region | |
|
1537
79bf863697eb
6951686: Using large pages on Linux prevents zero based compressed oops
kvn
parents:
1500
diff
changeset
|
3374 addr = (char*)shmat(shmid, req_addr, 0); |
| 0 | 3375 int err = errno; |
| 3376 | |
| 3377 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 3378 // will be deleted when it's detached by shmdt() or when the process | |
| 3379 // terminates. If shmat() is not successful this will remove the shared | |
| 3380 // segment immediately. | |
| 3381 shmctl(shmid, IPC_RMID, NULL); | |
| 3382 | |
| 3383 if ((intptr_t)addr == -1) { | |
| 3384 if (warn_on_failure) { | |
| 3385 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3386 warning("%s", msg); |
| 0 | 3387 } |
| 3388 return NULL; | |
| 3389 } | |
| 3390 | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3391 return addr; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3392 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3393 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3394 static void warn_on_large_pages_failure(char* req_addr, size_t bytes, int error) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3395 assert(error == ENOMEM, "Only expect to fail if no memory is available"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3396 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3397 bool warn_on_failure = UseLargePages && |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3398 (!FLAG_IS_DEFAULT(UseLargePages) || |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3399 !FLAG_IS_DEFAULT(UseHugeTLBFS) || |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3400 !FLAG_IS_DEFAULT(LargePageSizeInBytes)); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3401 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3402 if (warn_on_failure) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3403 char msg[128]; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3404 jio_snprintf(msg, sizeof(msg), "Failed to reserve large pages memory req_addr: " |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3405 PTR_FORMAT " bytes: " SIZE_FORMAT " (errno = %d).", req_addr, bytes, error); |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
3406 warning("%s", msg); |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3407 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3408 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3409 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3410 char* os::Linux::reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3411 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3412 assert(is_size_aligned(bytes, os::large_page_size()), "Unaligned size"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3413 assert(is_ptr_aligned(req_addr, os::large_page_size()), "Unaligned address"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3414 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3415 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3416 char* addr = (char*)::mmap(req_addr, bytes, prot, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3417 MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3418 -1, 0); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3419 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3420 if (addr == MAP_FAILED) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3421 warn_on_large_pages_failure(req_addr, bytes, errno); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3422 return NULL; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3423 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3424 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3425 assert(is_ptr_aligned(addr, os::large_page_size()), "Must be"); |
|
8711
6b803ba47588
8008257: NMT: assert(new_rec->is_allocation_record()) failed when running with shared memory option
zgu
parents:
8710
diff
changeset
|
3426 |
| 0 | 3427 return addr; |
| 3428 } | |
| 3429 | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3430 char* os::Linux::reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3431 size_t large_page_size = os::large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3432 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3433 assert(bytes >= large_page_size, "Shouldn't allocate large pages for small sizes"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3434 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3435 // Allocate small pages. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3436 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3437 char* start; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3438 if (req_addr != NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3439 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3440 assert(is_size_aligned(bytes, alignment), "Must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3441 start = os::reserve_memory(bytes, req_addr); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3442 assert(start == NULL || start == req_addr, "Must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3443 } else { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3444 start = os::reserve_memory_aligned(bytes, alignment); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3445 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3446 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3447 if (start == NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3448 return NULL; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3449 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3450 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3451 assert(is_ptr_aligned(start, alignment), "Must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3452 |
| 20360 | 3453 if (MemTracker::tracking_level() > NMT_minimal) { |
| 3454 // os::reserve_memory_special will record this memory area. | |
| 3455 // Need to release it here to prevent overlapping reservations. | |
| 3456 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); | |
| 3457 tkr.record((address)start, bytes); | |
| 3458 } | |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3459 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3460 char* end = start + bytes; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3461 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3462 // Find the regions of the allocated chunk that can be promoted to large pages. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3463 char* lp_start = (char*)align_ptr_up(start, large_page_size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3464 char* lp_end = (char*)align_ptr_down(end, large_page_size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3465 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3466 size_t lp_bytes = lp_end - lp_start; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3467 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3468 assert(is_size_aligned(lp_bytes, large_page_size), "Must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3469 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3470 if (lp_bytes == 0) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3471 // The mapped region doesn't even span the start and the end of a large page. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3472 // Fall back to allocate a non-special area. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3473 ::munmap(start, end - start); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3474 return NULL; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3475 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3476 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3477 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3478 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3479 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3480 void* result; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3481 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3482 if (start != lp_start) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3483 result = ::mmap(start, lp_start - start, prot, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3484 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3485 -1, 0); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3486 if (result == MAP_FAILED) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3487 ::munmap(lp_start, end - lp_start); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3488 return NULL; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3489 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3490 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3491 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3492 result = ::mmap(lp_start, lp_bytes, prot, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3493 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED|MAP_HUGETLB, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3494 -1, 0); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3495 if (result == MAP_FAILED) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3496 warn_on_large_pages_failure(req_addr, bytes, errno); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3497 // If the mmap above fails, the large pages region will be unmapped and we |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3498 // have regions before and after with small pages. Release these regions. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3499 // |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3500 // | mapped | unmapped | mapped | |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3501 // ^ ^ ^ ^ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3502 // start lp_start lp_end end |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3503 // |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3504 ::munmap(start, lp_start - start); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3505 ::munmap(lp_end, end - lp_end); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3506 return NULL; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3507 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3508 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3509 if (lp_end != end) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
3510 result = ::mmap(lp_end, end - lp_end, prot, |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
3511 MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED, |
|
4c84d351cca9
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|
3512 -1, 0); |
|
4c84d351cca9
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diff
changeset
|
3513 if (result == MAP_FAILED) { |
|
4c84d351cca9
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diff
changeset
|
3514 ::munmap(start, lp_end - start); |
|
4c84d351cca9
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diff
changeset
|
3515 return NULL; |
|
4c84d351cca9
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diff
changeset
|
3516 } |
|
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diff
changeset
|
3517 } |
|
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diff
changeset
|
3518 |
|
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3519 return start; |
|
4c84d351cca9
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stefank
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diff
changeset
|
3520 } |
|
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diff
changeset
|
3521 |
|
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changeset
|
3522 char* os::Linux::reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
|
4c84d351cca9
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|
3523 assert(UseLargePages && UseHugeTLBFS, "only for Huge TLBFS large pages"); |
|
4c84d351cca9
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|
3524 assert(is_ptr_aligned(req_addr, alignment), "Must be"); |
|
4c84d351cca9
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changeset
|
3525 assert(is_power_of_2(alignment), "Must be"); |
|
4c84d351cca9
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|
3526 assert(is_power_of_2(os::large_page_size()), "Must be"); |
|
4c84d351cca9
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|
3527 assert(bytes >= os::large_page_size(), "Shouldn't allocate large pages for small sizes"); |
|
4c84d351cca9
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changeset
|
3528 |
|
4c84d351cca9
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stefank
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diff
changeset
|
3529 if (is_size_aligned(bytes, os::large_page_size()) && alignment <= os::large_page_size()) { |
|
4c84d351cca9
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changeset
|
3530 return reserve_memory_special_huge_tlbfs_only(bytes, req_addr, exec); |
|
4c84d351cca9
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diff
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|
3531 } else { |
|
4c84d351cca9
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diff
changeset
|
3532 return reserve_memory_special_huge_tlbfs_mixed(bytes, alignment, req_addr, exec); |
|
4c84d351cca9
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diff
changeset
|
3533 } |
|
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diff
changeset
|
3534 } |
|
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diff
changeset
|
3535 |
|
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changeset
|
3536 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
|
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|
3537 assert(UseLargePages, "only for large pages"); |
|
4c84d351cca9
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diff
changeset
|
3538 |
|
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diff
changeset
|
3539 char* addr; |
|
4c84d351cca9
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diff
changeset
|
3540 if (UseSHM) { |
|
4c84d351cca9
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changeset
|
3541 addr = os::Linux::reserve_memory_special_shm(bytes, alignment, req_addr, exec); |
|
4c84d351cca9
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diff
changeset
|
3542 } else { |
|
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diff
changeset
|
3543 assert(UseHugeTLBFS, "must be"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3544 addr = os::Linux::reserve_memory_special_huge_tlbfs(bytes, alignment, req_addr, exec); |
|
4c84d351cca9
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diff
changeset
|
3545 } |
|
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diff
changeset
|
3546 |
|
4c84d351cca9
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changeset
|
3547 if (addr != NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3548 if (UseNUMAInterleaving) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3549 numa_make_global(addr, bytes); |
|
4c84d351cca9
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diff
changeset
|
3550 } |
|
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diff
changeset
|
3551 |
|
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changeset
|
3552 // The memory is committed |
| 20360 | 3553 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, CALLER_PC); |
|
12110
4c84d351cca9
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diff
changeset
|
3554 } |
|
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diff
changeset
|
3555 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3556 return addr; |
|
4c84d351cca9
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stefank
parents:
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diff
changeset
|
3557 } |
|
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3558 |
|
4c84d351cca9
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diff
changeset
|
3559 bool os::Linux::release_memory_special_shm(char* base, size_t bytes) { |
|
4c84d351cca9
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diff
changeset
|
3560 // detaching the SHM segment will also delete it, see reserve_memory_special_shm() |
|
4c84d351cca9
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changeset
|
3561 return shmdt(base) == 0; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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diff
changeset
|
3562 } |
|
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stefank
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diff
changeset
|
3563 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3564 bool os::Linux::release_memory_special_huge_tlbfs(char* base, size_t bytes) { |
|
4c84d351cca9
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diff
changeset
|
3565 return pd_release_memory(base, bytes); |
|
4c84d351cca9
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stefank
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diff
changeset
|
3566 } |
|
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diff
changeset
|
3567 |
| 0 | 3568 bool os::release_memory_special(char* base, size_t bytes) { |
| 20360 | 3569 bool res; |
| 3570 if (MemTracker::tracking_level() > NMT_minimal) { | |
| 3571 Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); | |
| 3572 res = os::Linux::release_memory_special_impl(base, bytes); | |
| 3573 if (res) { | |
| 3574 tkr.record((address)base, bytes); | |
| 3575 } | |
| 3576 | |
| 3577 } else { | |
| 3578 res = os::Linux::release_memory_special_impl(base, bytes); | |
| 3579 } | |
| 3580 return res; | |
| 3581 } | |
| 3582 | |
| 3583 bool os::Linux::release_memory_special_impl(char* base, size_t bytes) { | |
|
12110
4c84d351cca9
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changeset
|
3584 assert(UseLargePages, "only for large pages"); |
|
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changeset
|
3585 bool res; |
| 20360 | 3586 |
|
12110
4c84d351cca9
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changeset
|
3587 if (UseSHM) { |
|
4c84d351cca9
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diff
changeset
|
3588 res = os::Linux::release_memory_special_shm(base, bytes); |
|
4c84d351cca9
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diff
changeset
|
3589 } else { |
|
4c84d351cca9
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diff
changeset
|
3590 assert(UseHugeTLBFS, "must be"); |
|
4c84d351cca9
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changeset
|
3591 res = os::Linux::release_memory_special_huge_tlbfs(base, bytes); |
|
4c84d351cca9
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changeset
|
3592 } |
|
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changeset
|
3593 return res; |
| 0 | 3594 } |
| 3595 | |
| 3596 size_t os::large_page_size() { | |
| 3597 return _large_page_size; | |
| 3598 } | |
| 3599 | |
|
12110
4c84d351cca9
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changeset
|
3600 // With SysV SHM the entire memory region must be allocated as shared |
|
3286
139667d9836a
7034464: Support transparent large pages on Linux
iveresov
parents:
2302
diff
changeset
|
3601 // memory. |
|
12110
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changeset
|
3602 // HugeTLBFS allows application to commit large page memory on demand. |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3603 // However, when committing memory with HugeTLBFS fails, the region |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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changeset
|
3604 // that was supposed to be committed will lose the old reservation |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3605 // and allow other threads to steal that memory region. Because of this |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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diff
changeset
|
3606 // behavior we can't commit HugeTLBFS memory. |
| 0 | 3607 bool os::can_commit_large_page_memory() { |
|
12110
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diff
changeset
|
3608 return UseTransparentHugePages; |
| 0 | 3609 } |
| 3610 | |
|
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3611 bool os::can_execute_large_page_memory() { |
|
12110
4c84d351cca9
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changeset
|
3612 return UseTransparentHugePages || UseHugeTLBFS; |
|
79
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
jcoomes
parents:
62
diff
changeset
|
3613 } |
|
82db0859acbe
6642862: Code cache allocation fails with large pages after 6588638
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62
diff
changeset
|
3614 |
| 0 | 3615 // Reserve memory at an arbitrary address, only if that area is |
| 3616 // available (and not reserved for something else). | |
| 3617 | |
| 6197 | 3618 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 0 | 3619 const int max_tries = 10; |
| 3620 char* base[max_tries]; | |
| 3621 size_t size[max_tries]; | |
| 3622 const size_t gap = 0x000000; | |
| 3623 | |
| 3624 // Assert only that the size is a multiple of the page size, since | |
| 3625 // that's all that mmap requires, and since that's all we really know | |
| 3626 // about at this low abstraction level. If we need higher alignment, | |
| 3627 // we can either pass an alignment to this method or verify alignment | |
| 3628 // in one of the methods further up the call chain. See bug 5044738. | |
| 3629 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 3630 | |
| 3631 // Repeatedly allocate blocks until the block is allocated at the | |
| 3632 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 3633 // automatically update _highest_vm_reserved_address if the call is | |
| 3634 // successful. The variable tracks the highest memory address every reserved | |
| 3635 // by JVM. It is used to detect heap-stack collision if running with | |
| 3636 // fixed-stack LinuxThreads. Because here we may attempt to reserve more | |
| 3637 // space than needed, it could confuse the collision detecting code. To | |
| 3638 // solve the problem, save current _highest_vm_reserved_address and | |
| 3639 // calculate the correct value before return. | |
| 3640 address old_highest = _highest_vm_reserved_address; | |
| 3641 | |
| 3642 // Linux mmap allows caller to pass an address as hint; give it a try first, | |
| 3643 // if kernel honors the hint then we can return immediately. | |
| 3644 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 3645 if (addr == requested_addr) { | |
| 3646 return requested_addr; | |
| 3647 } | |
| 3648 | |
| 3649 if (addr != NULL) { | |
| 3650 // mmap() is successful but it fails to reserve at the requested address | |
| 3651 anon_munmap(addr, bytes); | |
| 3652 } | |
| 3653 | |
| 3654 int i; | |
| 3655 for (i = 0; i < max_tries; ++i) { | |
| 3656 base[i] = reserve_memory(bytes); | |
| 3657 | |
| 3658 if (base[i] != NULL) { | |
| 3659 // Is this the block we wanted? | |
| 3660 if (base[i] == requested_addr) { | |
| 3661 size[i] = bytes; | |
| 3662 break; | |
| 3663 } | |
| 3664 | |
| 3665 // Does this overlap the block we wanted? Give back the overlapped | |
| 3666 // parts and try again. | |
| 3667 | |
| 3668 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 3669 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 3670 unmap_memory(base[i], top_overlap); | |
| 3671 base[i] += top_overlap; | |
| 3672 size[i] = bytes - top_overlap; | |
| 3673 } else { | |
| 3674 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 3675 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 3676 unmap_memory(requested_addr, bottom_overlap); | |
| 3677 size[i] = bytes - bottom_overlap; | |
| 3678 } else { | |
| 3679 size[i] = bytes; | |
| 3680 } | |
| 3681 } | |
| 3682 } | |
| 3683 } | |
| 3684 | |
| 3685 // Give back the unused reserved pieces. | |
| 3686 | |
| 3687 for (int j = 0; j < i; ++j) { | |
| 3688 if (base[j] != NULL) { | |
| 3689 unmap_memory(base[j], size[j]); | |
| 3690 } | |
| 3691 } | |
| 3692 | |
| 3693 if (i < max_tries) { | |
| 3694 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 3695 return requested_addr; | |
| 3696 } else { | |
| 3697 _highest_vm_reserved_address = old_highest; | |
| 3698 return NULL; | |
| 3699 } | |
| 3700 } | |
| 3701 | |
| 3702 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 3703 return ::read(fd, buf, nBytes); | |
| 3704 } | |
| 3705 | |
| 3706 // TODO-FIXME: reconcile Solaris' os::sleep with the linux variation. | |
| 3707 // Solaris uses poll(), linux uses park(). | |
| 3708 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 3709 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 3710 // SIGSEGV, see 4355769. | |
| 3711 | |
| 3712 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 3713 assert(thread == Thread::current(), "thread consistency check"); | |
| 3714 | |
| 3715 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3716 slp->reset() ; | |
| 3717 OrderAccess::fence() ; | |
| 3718 | |
| 3719 if (interruptible) { | |
| 3720 jlong prevtime = javaTimeNanos(); | |
| 3721 | |
| 3722 for (;;) { | |
| 3723 if (os::is_interrupted(thread, true)) { | |
| 3724 return OS_INTRPT; | |
| 3725 } | |
| 3726 | |
| 3727 jlong newtime = javaTimeNanos(); | |
| 3728 | |
| 3729 if (newtime - prevtime < 0) { | |
| 3730 // time moving backwards, should only happen if no monotonic clock | |
| 3731 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3732 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
| 3733 } else { | |
|
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4082
diff
changeset
|
3734 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 0 | 3735 } |
| 3736 | |
| 3737 if(millis <= 0) { | |
| 3738 return OS_OK; | |
| 3739 } | |
| 3740 | |
| 3741 prevtime = newtime; | |
| 3742 | |
| 3743 { | |
| 3744 assert(thread->is_Java_thread(), "sanity check"); | |
| 3745 JavaThread *jt = (JavaThread *) thread; | |
| 3746 ThreadBlockInVM tbivm(jt); | |
| 3747 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 3748 | |
| 3749 jt->set_suspend_equivalent(); | |
| 3750 // cleared by handle_special_suspend_equivalent_condition() or | |
| 3751 // java_suspend_self() via check_and_wait_while_suspended() | |
| 3752 | |
| 3753 slp->park(millis); | |
| 3754 | |
| 3755 // were we externally suspended while we were waiting? | |
| 3756 jt->check_and_wait_while_suspended(); | |
| 3757 } | |
| 3758 } | |
| 3759 } else { | |
| 3760 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 3761 jlong prevtime = javaTimeNanos(); | |
| 3762 | |
| 3763 for (;;) { | |
| 3764 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 3765 // the 1st iteration ... | |
| 3766 jlong newtime = javaTimeNanos(); | |
| 3767 | |
| 3768 if (newtime - prevtime < 0) { | |
| 3769 // time moving backwards, should only happen if no monotonic clock | |
| 3770 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3771 assert(!Linux::supports_monotonic_clock(), "time moving backwards"); | |
| 3772 } else { | |
|
4712
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4082
diff
changeset
|
3773 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 0 | 3774 } |
| 3775 | |
| 3776 if(millis <= 0) break ; | |
| 3777 | |
| 3778 prevtime = newtime; | |
| 3779 slp->park(millis); | |
| 3780 } | |
| 3781 return OS_OK ; | |
| 3782 } | |
| 3783 } | |
| 3784 | |
|
17706
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|
3785 // |
|
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|
3786 // Short sleep, direct OS call. |
|
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|
3787 // |
|
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|
3788 // Note: certain versions of Linux CFS scheduler (since 2.6.23) do not guarantee |
|
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|
3789 // sched_yield(2) will actually give up the CPU: |
|
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|
3790 // |
|
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|
3791 // * Alone on this pariticular CPU, keeps running. |
|
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|
3792 // * Before the introduction of "skip_buddy" with "compat_yield" disabled |
|
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|
3793 // (pre 2.6.39). |
|
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|
3794 // |
|
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|
3795 // So calling this with 0 is an alternative. |
|
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|
3796 // |
|
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|
3797 void os::naked_short_sleep(jlong ms) { |
|
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|
3798 struct timespec req; |
|
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|
3799 |
|
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|
3800 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
|
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|
3801 req.tv_sec = 0; |
|
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|
3802 if (ms > 0) { |
|
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8028280: ParkEvent leak when running modified runThese which only loads classes
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|
3803 req.tv_nsec = (ms % 1000) * 1000000; |
|
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|
3804 } |
|
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|
3805 else { |
|
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|
3806 req.tv_nsec = 1; |
|
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|
3807 } |
|
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|
3808 |
|
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|
3809 nanosleep(&req, NULL); |
|
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|
3810 |
|
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|
3811 return; |
| 0 | 3812 } |
| 3813 | |
| 3814 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 3815 void os::infinite_sleep() { | |
| 3816 while (true) { // sleep forever ... | |
| 3817 ::sleep(100); // ... 100 seconds at a time | |
| 3818 } | |
| 3819 } | |
| 3820 | |
| 3821 // Used to convert frequent JVM_Yield() to nops | |
| 3822 bool os::dont_yield() { | |
| 3823 return DontYieldALot; | |
| 3824 } | |
| 3825 | |
| 3826 void os::yield() { | |
| 3827 sched_yield(); | |
| 3828 } | |
| 3829 | |
| 3830 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 3831 | |
| 3832 void os::yield_all(int attempts) { | |
| 3833 // Yields to all threads, including threads with lower priorities | |
| 3834 // Threads on Linux are all with same priority. The Solaris style | |
| 3835 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 3836 sched_yield(); | |
| 3837 } | |
| 3838 | |
| 3839 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 3840 void os::loop_breaker(int attempts) { | |
| 3841 os::yield_all(attempts); | |
| 3842 } | |
| 3843 | |
| 3844 //////////////////////////////////////////////////////////////////////////////// | |
| 3845 // thread priority support | |
| 3846 | |
| 3847 // Note: Normal Linux applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 3848 // only supports dynamic priority, static priority must be zero. For real-time | |
| 3849 // applications, Linux supports SCHED_RR which allows static priority (1-99). | |
| 3850 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 3851 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 3852 // of 5 runs - Sep 2005). | |
| 3853 // | |
| 3854 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 3855 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 3856 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 3857 // threads. It has always been the case, but could change in the future. For | |
| 3858 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 3859 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 3860 | |
|
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|
3861 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 0 | 3862 19, // 0 Entry should never be used |
| 3863 | |
| 3864 4, // 1 MinPriority | |
| 3865 3, // 2 | |
| 3866 2, // 3 | |
| 3867 | |
| 3868 1, // 4 | |
| 3869 0, // 5 NormPriority | |
| 3870 -1, // 6 | |
| 3871 | |
| 3872 -2, // 7 | |
| 3873 -3, // 8 | |
| 3874 -4, // 9 NearMaxPriority | |
| 3875 | |
|
4854
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|
3876 -5, // 10 MaxPriority |
|
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|
3877 |
|
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|
3878 -5 // 11 CriticalPriority |
| 0 | 3879 }; |
| 3880 | |
| 3881 static int prio_init() { | |
| 3882 if (ThreadPriorityPolicy == 1) { | |
| 3883 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 3884 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 3885 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 3886 if (geteuid() != 0) { | |
| 3887 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 3888 warning("-XX:ThreadPriorityPolicy requires root privilege on Linux"); | |
| 3889 } | |
| 3890 ThreadPriorityPolicy = 0; | |
| 3891 } | |
| 3892 } | |
|
4854
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|
3893 if (UseCriticalJavaThreadPriority) { |
|
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|
3894 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
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|
3895 } |
| 0 | 3896 return 0; |
| 3897 } | |
| 3898 | |
| 3899 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 3900 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 3901 | |
| 3902 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 3903 return (ret == 0) ? OS_OK : OS_ERR; | |
| 3904 } | |
| 3905 | |
| 3906 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 3907 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 3908 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 3909 return OS_OK; | |
| 3910 } | |
| 3911 | |
| 3912 errno = 0; | |
| 3913 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 3914 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 3915 } | |
| 3916 | |
| 3917 // Hint to the underlying OS that a task switch would not be good. | |
| 3918 // Void return because it's a hint and can fail. | |
| 3919 void os::hint_no_preempt() {} | |
| 3920 | |
| 3921 //////////////////////////////////////////////////////////////////////////////// | |
| 3922 // suspend/resume support | |
| 3923 | |
| 3924 // the low-level signal-based suspend/resume support is a remnant from the | |
| 3925 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 3926 // within hotspot. Now there is a single use-case for this: | |
| 3927 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 3928 // that runs in the watcher thread. | |
| 3929 // The remaining code is greatly simplified from the more general suspension | |
| 3930 // code that used to be used. | |
| 3931 // | |
| 3932 // The protocol is quite simple: | |
| 3933 // - suspend: | |
| 3934 // - sends a signal to the target thread | |
| 3935 // - polls the suspend state of the osthread using a yield loop | |
| 3936 // - target thread signal handler (SR_handler) sets suspend state | |
| 3937 // and blocks in sigsuspend until continued | |
| 3938 // - resume: | |
| 3939 // - sets target osthread state to continue | |
| 3940 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 3941 // | |
| 3942 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 3943 // | |
| 3944 | |
| 3945 static void resume_clear_context(OSThread *osthread) { | |
| 3946 osthread->set_ucontext(NULL); | |
| 3947 osthread->set_siginfo(NULL); | |
| 3948 } | |
| 3949 | |
| 3950 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 3951 osthread->set_ucontext(context); | |
| 3952 osthread->set_siginfo(siginfo); | |
| 3953 } | |
| 3954 | |
| 3955 // | |
| 3956 // Handler function invoked when a thread's execution is suspended or | |
| 3957 // resumed. We have to be careful that only async-safe functions are | |
| 3958 // called here (Note: most pthread functions are not async safe and | |
| 3959 // should be avoided.) | |
| 3960 // | |
| 3961 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 3962 // interface point of view, but sigwait() prevents the signal hander | |
| 3963 // from being run. libpthread would get very confused by not having | |
| 3964 // its signal handlers run and prevents sigwait()'s use with the | |
| 3965 // mutex granting granting signal. | |
| 3966 // | |
| 10405 | 3967 // Currently only ever called on the VMThread and JavaThreads (PC sampling) |
| 0 | 3968 // |
| 3969 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 3970 // Save and restore errno to avoid confusing native code with EINTR | |
| 3971 // after sigsuspend. | |
| 3972 int old_errno = errno; | |
| 3973 | |
| 3974 Thread* thread = Thread::current(); | |
| 3975 OSThread* osthread = thread->osthread(); | |
| 10405 | 3976 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| 3977 | |
| 3978 os::SuspendResume::State current = osthread->sr.state(); | |
| 3979 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
| 0 | 3980 suspend_save_context(osthread, siginfo, context); |
| 3981 | |
| 10405 | 3982 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| 3983 os::SuspendResume::State state = osthread->sr.suspended(); | |
| 3984 if (state == os::SuspendResume::SR_SUSPENDED) { | |
| 3985 sigset_t suspend_set; // signals for sigsuspend() | |
| 3986 | |
| 3987 // get current set of blocked signals and unblock resume signal | |
| 3988 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 3989 sigdelset(&suspend_set, SR_signum); | |
| 3990 | |
| 3991 sr_semaphore.signal(); | |
| 3992 // wait here until we are resumed | |
| 3993 while (1) { | |
| 3994 sigsuspend(&suspend_set); | |
| 3995 | |
| 3996 os::SuspendResume::State result = osthread->sr.running(); | |
| 3997 if (result == os::SuspendResume::SR_RUNNING) { | |
| 3998 sr_semaphore.signal(); | |
| 3999 break; | |
| 4000 } | |
| 4001 } | |
| 4002 | |
| 4003 } else if (state == os::SuspendResume::SR_RUNNING) { | |
| 4004 // request was cancelled, continue | |
| 4005 } else { | |
| 4006 ShouldNotReachHere(); | |
| 4007 } | |
| 0 | 4008 |
| 4009 resume_clear_context(osthread); | |
| 10405 | 4010 } else if (current == os::SuspendResume::SR_RUNNING) { |
| 4011 // request was cancelled, continue | |
| 4012 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 4013 // ignore | |
| 0 | 4014 } else { |
| 10405 | 4015 // ignore |
| 0 | 4016 } |
| 4017 | |
| 4018 errno = old_errno; | |
| 4019 } | |
| 4020 | |
| 4021 | |
| 4022 static int SR_initialize() { | |
| 4023 struct sigaction act; | |
| 4024 char *s; | |
| 4025 /* Get signal number to use for suspend/resume */ | |
| 4026 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 4027 int sig = ::strtol(s, 0, 10); | |
| 4028 if (sig > 0 || sig < _NSIG) { | |
| 4029 SR_signum = sig; | |
| 4030 } | |
| 4031 } | |
| 4032 | |
| 4033 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 4034 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 4035 | |
| 4036 sigemptyset(&SR_sigset); | |
| 4037 sigaddset(&SR_sigset, SR_signum); | |
| 4038 | |
| 4039 /* Set up signal handler for suspend/resume */ | |
| 4040 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 4041 act.sa_handler = (void (*)(int)) SR_handler; | |
| 4042 | |
| 4043 // SR_signum is blocked by default. | |
| 4044 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 4045 // supported Linux platforms). Note that LinuxThreads need to block | |
| 4046 // this signal for all threads to work properly. So we don't have | |
| 4047 // to use hard-coded signal number when setting up the mask. | |
| 4048 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 4049 | |
| 4050 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 4051 return -1; | |
| 4052 } | |
| 4053 | |
| 4054 // Save signal flag | |
| 4055 os::Linux::set_our_sigflags(SR_signum, act.sa_flags); | |
| 4056 return 0; | |
| 4057 } | |
| 4058 | |
| 10405 | 4059 static int sr_notify(OSThread* osthread) { |
| 4060 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 4061 assert_status(status == 0, status, "pthread_kill"); | |
| 4062 return status; | |
| 4063 } | |
| 4064 | |
| 4065 // "Randomly" selected value for how long we want to spin | |
| 4066 // before bailing out on suspending a thread, also how often | |
| 4067 // we send a signal to a thread we want to resume | |
| 4068 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
| 4069 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
| 0 | 4070 |
| 4071 // returns true on success and false on error - really an error is fatal | |
| 4072 // but this seems the normal response to library errors | |
| 4073 static bool do_suspend(OSThread* osthread) { | |
| 10405 | 4074 assert(osthread->sr.is_running(), "thread should be running"); |
| 4075 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
| 4076 | |
| 0 | 4077 // mark as suspended and send signal |
| 10405 | 4078 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| 4079 // failed to switch, state wasn't running? | |
| 4080 ShouldNotReachHere(); | |
| 4081 return false; | |
| 4082 } | |
| 4083 | |
| 4084 if (sr_notify(osthread) != 0) { | |
| 4085 ShouldNotReachHere(); | |
| 4086 } | |
| 4087 | |
| 4088 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
| 4089 while (true) { | |
| 4090 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 4091 break; | |
| 4092 } else { | |
| 4093 // timeout | |
| 4094 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
| 4095 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
| 4096 return false; | |
| 4097 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
| 4098 // make sure that we consume the signal on the semaphore as well | |
| 4099 sr_semaphore.wait(); | |
| 4100 break; | |
| 4101 } else { | |
| 4102 ShouldNotReachHere(); | |
| 4103 return false; | |
| 4104 } | |
| 0 | 4105 } |
| 10405 | 4106 } |
| 4107 | |
| 4108 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
| 4109 return true; | |
| 0 | 4110 } |
| 4111 | |
| 4112 static void do_resume(OSThread* osthread) { | |
| 4113 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 10405 | 4114 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| 4115 | |
| 4116 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 4117 // failed to switch to WAKEUP_REQUEST | |
| 4118 ShouldNotReachHere(); | |
| 4119 return; | |
| 4120 } | |
| 4121 | |
| 4122 while (true) { | |
| 4123 if (sr_notify(osthread) == 0) { | |
| 4124 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 4125 if (osthread->sr.is_running()) { | |
| 4126 return; | |
| 4127 } | |
| 4128 } | |
| 4129 } else { | |
| 4130 ShouldNotReachHere(); | |
| 0 | 4131 } |
| 4132 } | |
| 10405 | 4133 |
| 4134 guarantee(osthread->sr.is_running(), "Must be running!"); | |
| 0 | 4135 } |
| 4136 | |
| 4137 //////////////////////////////////////////////////////////////////////////////// | |
| 4138 // interrupt support | |
| 4139 | |
| 4140 void os::interrupt(Thread* thread) { | |
| 4141 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 4142 "possibility of dangling Thread pointer"); | |
| 4143 | |
| 4144 OSThread* osthread = thread->osthread(); | |
| 4145 | |
| 4146 if (!osthread->interrupted()) { | |
| 4147 osthread->set_interrupted(true); | |
| 4148 // More than one thread can get here with the same value of osthread, | |
| 4149 // resulting in multiple notifications. We do, however, want the store | |
| 4150 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 4151 OrderAccess::fence(); | |
| 4152 ParkEvent * const slp = thread->_SleepEvent ; | |
| 4153 if (slp != NULL) slp->unpark() ; | |
| 4154 } | |
| 4155 | |
| 4156 // For JSR166. Unpark even if interrupt status already was set | |
| 4157 if (thread->is_Java_thread()) | |
| 4158 ((JavaThread*)thread)->parker()->unpark(); | |
| 4159 | |
| 4160 ParkEvent * ev = thread->_ParkEvent ; | |
| 4161 if (ev != NULL) ev->unpark() ; | |
| 4162 | |
| 4163 } | |
| 4164 | |
| 4165 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 4166 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 4167 "possibility of dangling Thread pointer"); | |
| 4168 | |
| 4169 OSThread* osthread = thread->osthread(); | |
| 4170 | |
| 4171 bool interrupted = osthread->interrupted(); | |
| 4172 | |
| 4173 if (interrupted && clear_interrupted) { | |
| 4174 osthread->set_interrupted(false); | |
| 4175 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 4176 } | |
| 4177 | |
| 4178 return interrupted; | |
| 4179 } | |
| 4180 | |
| 4181 /////////////////////////////////////////////////////////////////////////////////// | |
| 4182 // signal handling (except suspend/resume) | |
| 4183 | |
| 4184 // This routine may be used by user applications as a "hook" to catch signals. | |
| 4185 // The user-defined signal handler must pass unrecognized signals to this | |
| 4186 // routine, and if it returns true (non-zero), then the signal handler must | |
| 4187 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 4188 // routine will never retun false (zero), but instead will execute a VM panic | |
| 4189 // routine kill the process. | |
| 4190 // | |
| 4191 // If this routine returns false, it is OK to call it again. This allows | |
| 4192 // the user-defined signal handler to perform checks either before or after | |
| 4193 // the VM performs its own checks. Naturally, the user code would be making | |
| 4194 // a serious error if it tried to handle an exception (such as a null check | |
| 4195 // or breakpoint) that the VM was generating for its own correct operation. | |
| 4196 // | |
| 4197 // This routine may recognize any of the following kinds of signals: | |
| 4198 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 4199 // It should be consulted by handlers for any of those signals. | |
| 4200 // | |
| 4201 // The caller of this routine must pass in the three arguments supplied | |
| 4202 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 4203 // field of the structure passed to sigaction(). This routine assumes that | |
| 4204 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 4205 // | |
| 4206 // Note that the VM will print warnings if it detects conflicting signal | |
| 4207 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 4208 // | |
| 2191 | 4209 extern "C" JNIEXPORT int |
| 0 | 4210 JVM_handle_linux_signal(int signo, siginfo_t* siginfo, |
| 4211 void* ucontext, int abort_if_unrecognized); | |
| 4212 | |
| 4213 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 4214 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 8067 | 4215 int orig_errno = errno; // Preserve errno value over signal handler. |
| 0 | 4216 JVM_handle_linux_signal(sig, info, uc, true); |
| 8067 | 4217 errno = orig_errno; |
| 0 | 4218 } |
| 4219 | |
| 4220 | |
| 4221 // This boolean allows users to forward their own non-matching signals | |
| 4222 // to JVM_handle_linux_signal, harmlessly. | |
| 4223 bool os::Linux::signal_handlers_are_installed = false; | |
| 4224 | |
| 4225 // For signal-chaining | |
| 4226 struct sigaction os::Linux::sigact[MAXSIGNUM]; | |
| 4227 unsigned int os::Linux::sigs = 0; | |
| 4228 bool os::Linux::libjsig_is_loaded = false; | |
| 4229 typedef struct sigaction *(*get_signal_t)(int); | |
| 4230 get_signal_t os::Linux::get_signal_action = NULL; | |
| 4231 | |
| 4232 struct sigaction* os::Linux::get_chained_signal_action(int sig) { | |
| 4233 struct sigaction *actp = NULL; | |
| 4234 | |
| 4235 if (libjsig_is_loaded) { | |
| 4236 // Retrieve the old signal handler from libjsig | |
| 4237 actp = (*get_signal_action)(sig); | |
| 4238 } | |
| 4239 if (actp == NULL) { | |
| 4240 // Retrieve the preinstalled signal handler from jvm | |
| 4241 actp = get_preinstalled_handler(sig); | |
| 4242 } | |
| 4243 | |
| 4244 return actp; | |
| 4245 } | |
| 4246 | |
| 4247 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 4248 siginfo_t *siginfo, void *context) { | |
| 4249 // Call the old signal handler | |
| 4250 if (actp->sa_handler == SIG_DFL) { | |
| 4251 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 4252 // instead of taking the default action. | |
| 4253 return false; | |
| 4254 } else if (actp->sa_handler != SIG_IGN) { | |
| 4255 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 4256 // automaticlly block the signal | |
| 4257 sigaddset(&(actp->sa_mask), sig); | |
| 4258 } | |
| 4259 | |
| 4260 sa_handler_t hand; | |
| 4261 sa_sigaction_t sa; | |
| 4262 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 4263 // retrieve the chained handler | |
| 4264 if (siginfo_flag_set) { | |
| 4265 sa = actp->sa_sigaction; | |
| 4266 } else { | |
| 4267 hand = actp->sa_handler; | |
| 4268 } | |
| 4269 | |
| 4270 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 4271 actp->sa_handler = SIG_DFL; | |
| 4272 } | |
| 4273 | |
| 4274 // try to honor the signal mask | |
| 4275 sigset_t oset; | |
| 4276 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 4277 | |
| 4278 // call into the chained handler | |
| 4279 if (siginfo_flag_set) { | |
| 4280 (*sa)(sig, siginfo, context); | |
| 4281 } else { | |
| 4282 (*hand)(sig); | |
| 4283 } | |
| 4284 | |
| 4285 // restore the signal mask | |
| 4286 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 4287 } | |
| 4288 // Tell jvm's signal handler the signal is taken care of. | |
| 4289 return true; | |
| 4290 } | |
| 4291 | |
| 4292 bool os::Linux::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 4293 bool chained = false; | |
| 4294 // signal-chaining | |
| 4295 if (UseSignalChaining) { | |
| 4296 struct sigaction *actp = get_chained_signal_action(sig); | |
| 4297 if (actp != NULL) { | |
| 4298 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 4299 } | |
| 4300 } | |
| 4301 return chained; | |
| 4302 } | |
| 4303 | |
| 4304 struct sigaction* os::Linux::get_preinstalled_handler(int sig) { | |
| 4305 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 4306 return &sigact[sig]; | |
| 4307 } | |
| 4308 return NULL; | |
| 4309 } | |
| 4310 | |
| 4311 void os::Linux::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 4312 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4313 sigact[sig] = oldAct; | |
| 4314 sigs |= (unsigned int)1 << sig; | |
| 4315 } | |
| 4316 | |
| 4317 // for diagnostic | |
| 4318 int os::Linux::sigflags[MAXSIGNUM]; | |
| 4319 | |
| 4320 int os::Linux::get_our_sigflags(int sig) { | |
| 4321 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4322 return sigflags[sig]; | |
| 4323 } | |
| 4324 | |
| 4325 void os::Linux::set_our_sigflags(int sig, int flags) { | |
| 4326 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4327 sigflags[sig] = flags; | |
| 4328 } | |
| 4329 | |
| 4330 void os::Linux::set_signal_handler(int sig, bool set_installed) { | |
| 4331 // Check for overwrite. | |
| 4332 struct sigaction oldAct; | |
| 4333 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 4334 | |
| 4335 void* oldhand = oldAct.sa_sigaction | |
| 4336 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4337 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4338 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 4339 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 4340 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 4341 if (AllowUserSignalHandlers || !set_installed) { | |
| 4342 // Do not overwrite; user takes responsibility to forward to us. | |
| 4343 return; | |
| 4344 } else if (UseSignalChaining) { | |
| 4345 // save the old handler in jvm | |
| 4346 save_preinstalled_handler(sig, oldAct); | |
| 4347 // libjsig also interposes the sigaction() call below and saves the | |
| 4348 // old sigaction on it own. | |
| 4349 } else { | |
|
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|
4350 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " |
|
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|
4351 "%#lx for signal %d.", (long)oldhand, sig)); |
| 0 | 4352 } |
| 4353 } | |
| 4354 | |
| 4355 struct sigaction sigAct; | |
| 4356 sigfillset(&(sigAct.sa_mask)); | |
| 4357 sigAct.sa_handler = SIG_DFL; | |
| 4358 if (!set_installed) { | |
| 4359 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4360 } else { | |
| 4361 sigAct.sa_sigaction = signalHandler; | |
| 4362 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4363 } | |
| 4364 // Save flags, which are set by ours | |
| 4365 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4366 sigflags[sig] = sigAct.sa_flags; | |
| 4367 | |
| 4368 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 4369 assert(ret == 0, "check"); | |
| 4370 | |
| 4371 void* oldhand2 = oldAct.sa_sigaction | |
| 4372 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4373 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4374 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 4375 } | |
| 4376 | |
| 4377 // install signal handlers for signals that HotSpot needs to | |
| 4378 // handle in order to support Java-level exception handling. | |
| 4379 | |
| 4380 void os::Linux::install_signal_handlers() { | |
| 4381 if (!signal_handlers_are_installed) { | |
| 4382 signal_handlers_are_installed = true; | |
| 4383 | |
| 4384 // signal-chaining | |
| 4385 typedef void (*signal_setting_t)(); | |
| 4386 signal_setting_t begin_signal_setting = NULL; | |
| 4387 signal_setting_t end_signal_setting = NULL; | |
| 4388 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4389 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 4390 if (begin_signal_setting != NULL) { | |
| 4391 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4392 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 4393 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 4394 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 4395 libjsig_is_loaded = true; | |
| 4396 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 4397 } | |
| 4398 if (libjsig_is_loaded) { | |
| 4399 // Tell libjsig jvm is setting signal handlers | |
| 4400 (*begin_signal_setting)(); | |
| 4401 } | |
| 4402 | |
| 4403 set_signal_handler(SIGSEGV, true); | |
| 4404 set_signal_handler(SIGPIPE, true); | |
| 4405 set_signal_handler(SIGBUS, true); | |
| 4406 set_signal_handler(SIGILL, true); | |
| 4407 set_signal_handler(SIGFPE, true); | |
|
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|
4408 #if defined(PPC64) |
|
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|
4409 set_signal_handler(SIGTRAP, true); |
|
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|
4410 #endif |
| 0 | 4411 set_signal_handler(SIGXFSZ, true); |
| 4412 | |
| 4413 if (libjsig_is_loaded) { | |
| 4414 // Tell libjsig jvm finishes setting signal handlers | |
| 4415 (*end_signal_setting)(); | |
| 4416 } | |
| 4417 | |
| 4418 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
|
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|
4419 // and if UserSignalHandler is installed all bets are off. |
|
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|
4420 // Log that signal checking is off only if -verbose:jni is specified. |
| 0 | 4421 if (CheckJNICalls) { |
| 4422 if (libjsig_is_loaded) { | |
|
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|
4423 if (PrintJNIResolving) { |
|
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|
4424 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
|
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|
4425 } |
| 0 | 4426 check_signals = false; |
| 4427 } | |
| 4428 if (AllowUserSignalHandlers) { | |
|
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|
4429 if (PrintJNIResolving) { |
|
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|
4430 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
|
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|
4431 } |
| 0 | 4432 check_signals = false; |
| 4433 } | |
| 4434 } | |
| 4435 } | |
| 4436 } | |
| 4437 | |
| 4438 // This is the fastest way to get thread cpu time on Linux. | |
| 4439 // Returns cpu time (user+sys) for any thread, not only for current. | |
| 4440 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
| 4441 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
| 4442 // For reference, please, see IEEE Std 1003.1-2004: | |
| 4443 // http://www.unix.org/single_unix_specification | |
| 4444 | |
| 4445 jlong os::Linux::fast_thread_cpu_time(clockid_t clockid) { | |
| 4446 struct timespec tp; | |
| 4447 int rc = os::Linux::clock_gettime(clockid, &tp); | |
| 4448 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
| 4449 | |
|
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4082
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|
4450 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
| 0 | 4451 } |
| 4452 | |
| 4453 ///// | |
| 4454 // glibc on Linux platform uses non-documented flag | |
| 4455 // to indicate, that some special sort of signal | |
| 4456 // trampoline is used. | |
| 4457 // We will never set this flag, and we should | |
| 4458 // ignore this flag in our diagnostic | |
| 4459 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 4460 #undef SIGNIFICANT_SIGNAL_MASK | |
| 4461 #endif | |
| 4462 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 4463 | |
| 4464 static const char* get_signal_handler_name(address handler, | |
| 4465 char* buf, int buflen) { | |
| 4466 int offset; | |
| 4467 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 4468 if (found) { | |
| 4469 // skip directory names | |
| 4470 const char *p1, *p2; | |
| 4471 p1 = buf; | |
| 4472 size_t len = strlen(os::file_separator()); | |
| 4473 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 4474 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 4475 } else { | |
| 4476 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 4477 } | |
| 4478 return buf; | |
| 4479 } | |
| 4480 | |
| 4481 static void print_signal_handler(outputStream* st, int sig, | |
| 4482 char* buf, size_t buflen) { | |
| 4483 struct sigaction sa; | |
| 4484 | |
| 4485 sigaction(sig, NULL, &sa); | |
| 4486 | |
| 4487 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 4488 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4489 | |
| 4490 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 4491 | |
| 4492 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 4493 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 4494 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 4495 | |
| 4496 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 4497 st->print("SIG_DFL"); | |
| 4498 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 4499 st->print("SIG_IGN"); | |
| 4500 } else { | |
| 4501 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 4502 } | |
| 4503 | |
| 14410 | 4504 st->print(", sa_mask[0]="); |
| 4505 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
| 0 | 4506 |
| 4507 address rh = VMError::get_resetted_sighandler(sig); | |
| 4508 // May be, handler was resetted by VMError? | |
| 4509 if(rh != NULL) { | |
| 4510 handler = rh; | |
| 4511 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 4512 } | |
| 4513 | |
| 14410 | 4514 st->print(", sa_flags="); |
| 4515 os::Posix::print_sa_flags(st, sa.sa_flags); | |
| 0 | 4516 |
| 4517 // Check: is it our handler? | |
| 4518 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 4519 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 4520 // It is our signal handler | |
| 4521 // check for flags, reset system-used one! | |
| 4522 if((int)sa.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
| 4523 st->print( | |
| 4524 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 4525 os::Linux::get_our_sigflags(sig)); | |
| 4526 } | |
| 4527 } | |
| 4528 st->cr(); | |
| 4529 } | |
| 4530 | |
| 4531 | |
| 4532 #define DO_SIGNAL_CHECK(sig) \ | |
| 4533 if (!sigismember(&check_signal_done, sig)) \ | |
| 4534 os::Linux::check_signal_handler(sig) | |
| 4535 | |
| 4536 // This method is a periodic task to check for misbehaving JNI applications | |
| 4537 // under CheckJNI, we can add any periodic checks here | |
| 4538 | |
| 4539 void os::run_periodic_checks() { | |
| 4540 | |
| 4541 if (check_signals == false) return; | |
| 4542 | |
| 4543 // SEGV and BUS if overridden could potentially prevent | |
| 4544 // generation of hs*.log in the event of a crash, debugging | |
| 4545 // such a case can be very challenging, so we absolutely | |
| 4546 // check the following for a good measure: | |
| 4547 DO_SIGNAL_CHECK(SIGSEGV); | |
| 4548 DO_SIGNAL_CHECK(SIGILL); | |
| 4549 DO_SIGNAL_CHECK(SIGFPE); | |
| 4550 DO_SIGNAL_CHECK(SIGBUS); | |
| 4551 DO_SIGNAL_CHECK(SIGPIPE); | |
| 4552 DO_SIGNAL_CHECK(SIGXFSZ); | |
|
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|
4553 #if defined(PPC64) |
|
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14422
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|
4554 DO_SIGNAL_CHECK(SIGTRAP); |
|
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|
4555 #endif |
| 0 | 4556 |
| 4557 // ReduceSignalUsage allows the user to override these handlers | |
| 4558 // see comments at the very top and jvm_solaris.h | |
| 4559 if (!ReduceSignalUsage) { | |
| 4560 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 4561 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 4562 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 4563 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 4564 } | |
| 4565 | |
| 4566 DO_SIGNAL_CHECK(SR_signum); | |
| 4567 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 4568 } | |
| 4569 | |
| 4570 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 4571 | |
| 4572 static os_sigaction_t os_sigaction = NULL; | |
| 4573 | |
| 4574 void os::Linux::check_signal_handler(int sig) { | |
| 4575 char buf[O_BUFLEN]; | |
| 4576 address jvmHandler = NULL; | |
| 4577 | |
| 4578 | |
| 4579 struct sigaction act; | |
| 4580 if (os_sigaction == NULL) { | |
| 4581 // only trust the default sigaction, in case it has been interposed | |
| 4582 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 4583 if (os_sigaction == NULL) return; | |
| 4584 } | |
| 4585 | |
| 4586 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 4587 | |
| 4588 | |
| 4589 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4590 | |
| 4591 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 4592 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 4593 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 4594 | |
| 4595 | |
| 4596 switch(sig) { | |
| 4597 case SIGSEGV: | |
| 4598 case SIGBUS: | |
| 4599 case SIGFPE: | |
| 4600 case SIGPIPE: | |
| 4601 case SIGILL: | |
| 4602 case SIGXFSZ: | |
| 4603 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 4604 break; | |
| 4605 | |
| 4606 case SHUTDOWN1_SIGNAL: | |
| 4607 case SHUTDOWN2_SIGNAL: | |
| 4608 case SHUTDOWN3_SIGNAL: | |
| 4609 case BREAK_SIGNAL: | |
| 4610 jvmHandler = (address)user_handler(); | |
| 4611 break; | |
| 4612 | |
| 4613 case INTERRUPT_SIGNAL: | |
| 4614 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 4615 break; | |
| 4616 | |
| 4617 default: | |
| 4618 if (sig == SR_signum) { | |
| 4619 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 4620 } else { | |
| 4621 return; | |
| 4622 } | |
| 4623 break; | |
| 4624 } | |
| 4625 | |
| 4626 if (thisHandler != jvmHandler) { | |
| 4627 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 4628 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 4629 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 4630 // No need to check this sig any longer | |
| 4631 sigaddset(&check_signal_done, sig); | |
| 4632 } else if(os::Linux::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Linux::get_our_sigflags(sig)) { | |
| 4633 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 4634 tty->print("expected:" PTR32_FORMAT, os::Linux::get_our_sigflags(sig)); | |
| 4635 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 4636 // No need to check this sig any longer | |
| 4637 sigaddset(&check_signal_done, sig); | |
| 4638 } | |
| 4639 | |
| 4640 // Dump all the signal | |
| 4641 if (sigismember(&check_signal_done, sig)) { | |
| 4642 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 4643 } | |
| 4644 } | |
| 4645 | |
| 4646 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 4647 | |
| 4648 extern bool signal_name(int signo, char* buf, size_t len); | |
| 4649 | |
| 4650 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 4651 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 4652 // signal | |
| 4653 if (!signal_name(exception_code, buf, size)) { | |
| 4654 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 4655 } | |
| 4656 return buf; | |
| 4657 } else { | |
| 4658 return NULL; | |
| 4659 } | |
| 4660 } | |
| 4661 | |
| 4662 // this is called _before_ the most of global arguments have been parsed | |
| 4663 void os::init(void) { | |
| 4664 char dummy; /* used to get a guess on initial stack address */ | |
| 4665 // first_hrtime = gethrtime(); | |
| 4666 | |
| 4667 // With LinuxThreads the JavaMain thread pid (primordial thread) | |
| 4668 // is different than the pid of the java launcher thread. | |
| 4669 // So, on Linux, the launcher thread pid is passed to the VM | |
| 4670 // via the sun.java.launcher.pid property. | |
| 4671 // Use this property instead of getpid() if it was correctly passed. | |
| 4672 // See bug 6351349. | |
| 4673 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 4674 | |
| 4675 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 4676 | |
| 4677 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
| 4678 | |
| 4679 init_random(1234567); | |
| 4680 | |
| 4681 ThreadCritical::initialize(); | |
| 4682 | |
| 4683 Linux::set_page_size(sysconf(_SC_PAGESIZE)); | |
| 4684 if (Linux::page_size() == -1) { | |
|
1490
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4685 fatal(err_msg("os_linux.cpp: os::init: sysconf failed (%s)", |
|
f03d0a26bf83
6888954: argument formatting for assert() and friends
jcoomes
parents:
1353
diff
changeset
|
4686 strerror(errno))); |
| 0 | 4687 } |
| 4688 init_page_sizes((size_t) Linux::page_size()); | |
| 4689 | |
| 4690 Linux::initialize_system_info(); | |
| 4691 | |
| 4692 // main_thread points to the aboriginal thread | |
| 4693 Linux::_main_thread = pthread_self(); | |
| 4694 | |
| 4695 Linux::clock_init(); | |
|
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12840
diff
changeset
|
4696 initial_time_count = javaTimeNanos(); |
|
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4697 |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4698 // pthread_condattr initialization for monotonic clock |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4699 int status; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4700 pthread_condattr_t* _condattr = os::Linux::condAttr(); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4701 if ((status = pthread_condattr_init(_condattr)) != 0) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4702 fatal(err_msg("pthread_condattr_init: %s", strerror(status))); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4703 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4704 // Only set the clock if CLOCK_MONOTONIC is available |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4705 if (Linux::supports_monotonic_clock()) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4706 if ((status = pthread_condattr_setclock(_condattr, CLOCK_MONOTONIC)) != 0) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4707 if (status == EINVAL) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4708 warning("Unable to use monotonic clock with relative timed-waits" \ |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4709 " - changes to the time-of-day clock may have adverse affects"); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4710 } else { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4711 fatal(err_msg("pthread_condattr_setclock: %s", strerror(status))); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4712 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4713 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4714 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4715 // else it defaults to CLOCK_REALTIME |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
4716 |
| 242 | 4717 pthread_mutex_init(&dl_mutex, NULL); |
|
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4718 |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4719 // If the pagesize of the VM is greater than 8K determine the appropriate |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4720 // number of initial guard pages. The user can change this with the |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4721 // command line arguments, if needed. |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4722 if (vm_page_size() > (int)Linux::vm_default_page_size()) { |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4723 StackYellowPages = 1; |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4724 StackRedPages = 1; |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4725 StackShadowPages = round_to((StackShadowPages*Linux::vm_default_page_size()), vm_page_size()) / vm_page_size(); |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4726 } |
| 0 | 4727 } |
| 4728 | |
| 4729 // To install functions for atexit system call | |
| 4730 extern "C" { | |
| 4731 static void perfMemory_exit_helper() { | |
| 4732 perfMemory_exit(); | |
| 4733 } | |
| 4734 } | |
| 4735 | |
| 4736 // this is called _after_ the global arguments have been parsed | |
| 4737 jint os::init_2(void) | |
| 4738 { | |
| 4739 Linux::fast_thread_clock_init(); | |
| 4740 | |
| 4741 // Allocate a single page and mark it as readable for safepoint polling | |
| 4742 address polling_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 4743 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 4744 | |
| 4745 os::set_polling_page( polling_page ); | |
| 4746 | |
| 4747 #ifndef PRODUCT | |
| 4748 if(Verbose && PrintMiscellaneous) | |
| 4749 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 4750 #endif | |
| 4751 | |
| 4752 if (!UseMembar) { | |
| 4753 address mem_serialize_page = (address) ::mmap(NULL, Linux::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
|
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
4754 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
| 0 | 4755 os::set_memory_serialize_page( mem_serialize_page ); |
| 4756 | |
| 4757 #ifndef PRODUCT | |
| 4758 if(Verbose && PrintMiscellaneous) | |
| 4759 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 4760 #endif | |
| 4761 } | |
| 4762 | |
| 4763 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 4764 if (SR_initialize() != 0) { | |
| 4765 perror("SR_initialize failed"); | |
| 4766 return JNI_ERR; | |
| 4767 } | |
| 4768 | |
| 4769 Linux::signal_sets_init(); | |
| 4770 Linux::install_signal_handlers(); | |
| 4771 | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4772 // 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
|
4773 // the java system classes, including StackOverflowError - depends on page |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4774 // 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
|
4775 // 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
|
4776 // class initialization depending on 32 or 64 bit VM. |
|
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4777 os::Linux::min_stack_allowed = MAX2(os::Linux::min_stack_allowed, |
|
10164
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4778 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Linux::page_size() + |
|
b4081e9714ec
8013398: Adjust number of stack guard pages on systems with large memory page size
vladidan
parents:
10157
diff
changeset
|
4779 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Linux::vm_default_page_size()); |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4780 |
| 0 | 4781 size_t threadStackSizeInBytes = ThreadStackSize * K; |
| 4782 if (threadStackSizeInBytes != 0 && | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4783 threadStackSizeInBytes < os::Linux::min_stack_allowed) { |
| 0 | 4784 tty->print_cr("\nThe stack size specified is too small, " |
| 4785 "Specify at least %dk", | |
|
1867
b6aedd1acdc0
6983240: guarantee((Solaris::min_stack_allowed >= (StackYellowPages+StackRedPages...) wrong
coleenp
parents:
1865
diff
changeset
|
4786 os::Linux::min_stack_allowed/ K); |
| 0 | 4787 return JNI_ERR; |
| 4788 } | |
| 4789 | |
| 4790 // Make the stack size a multiple of the page size so that | |
| 4791 // the yellow/red zones can be guarded. | |
| 4792 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 4793 vm_page_size())); | |
| 4794 | |
| 4795 Linux::capture_initial_stack(JavaThread::stack_size_at_create()); | |
| 4796 | |
|
12313
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4797 #if defined(IA32) |
|
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4798 workaround_expand_exec_shield_cs_limit(); |
|
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4799 #endif |
|
899ecf76b570
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
dsimms
parents:
12252
diff
changeset
|
4800 |
| 0 | 4801 Linux::libpthread_init(); |
| 4802 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 4803 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
| 4804 Linux::glibc_version(), Linux::libpthread_version(), | |
| 4805 Linux::is_floating_stack() ? "floating stack" : "fixed stack"); | |
| 4806 } | |
| 4807 | |
| 141 | 4808 if (UseNUMA) { |
|
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4809 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
|
4810 UseNUMA = false; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4811 } else { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4812 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
|
4813 // 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
|
4814 UseNUMA = false; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4815 } |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4816 } |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4817 // With SHM and HugeTLBFS large pages we cannot uncommit a page, so there's no way |
|
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4818 // we can make the adaptive lgrp chunk resizing work. If the user specified |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4819 // both UseNUMA and UseLargePages (or UseSHM/UseHugeTLBFS) on the command line - warn and |
|
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4820 // disable adaptive resizing. |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4821 if (UseNUMA && UseLargePages && !can_commit_large_page_memory()) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4822 if (FLAG_IS_DEFAULT(UseNUMA)) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4823 UseNUMA = false; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4824 } else { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4825 if (FLAG_IS_DEFAULT(UseLargePages) && |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4826 FLAG_IS_DEFAULT(UseSHM) && |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4827 FLAG_IS_DEFAULT(UseHugeTLBFS)) { |
|
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4828 UseLargePages = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4829 } else { |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
4830 warning("UseNUMA is not fully compatible with SHM/HugeTLBFS large pages, disabling adaptive resizing"); |
|
3292
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4831 UseAdaptiveSizePolicy = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4832 UseAdaptiveNUMAChunkSizing = false; |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4833 } |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4834 } |
|
c303b3532d4a
7037939: NUMA: Disable adaptive resizing if SHM large pages are used
iveresov
parents:
3290
diff
changeset
|
4835 } |
|
462
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4836 if (!UseNUMA && ForceNUMA) { |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4837 UseNUMA = true; |
|
85f1b9537f70
6779436: NUMA allocator: libnuma expects certain size of the buffer in numa_node_to_cpus()
iveresov
parents:
356
diff
changeset
|
4838 } |
| 141 | 4839 } |
| 4840 | |
| 0 | 4841 if (MaxFDLimit) { |
| 4842 // set the number of file descriptors to max. print out error | |
| 4843 // if getrlimit/setrlimit fails but continue regardless. | |
| 4844 struct rlimit nbr_files; | |
| 4845 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4846 if (status != 0) { | |
| 4847 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4848 perror("os::init_2 getrlimit failed"); | |
| 4849 } else { | |
| 4850 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 4851 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4852 if (status != 0) { | |
| 4853 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4854 perror("os::init_2 setrlimit failed"); | |
| 4855 } | |
| 4856 } | |
| 4857 } | |
| 4858 | |
| 4859 // Initialize lock used to serialize thread creation (see os::create_thread) | |
| 4860 Linux::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
| 4861 | |
| 4862 // at-exit methods are called in the reverse order of their registration. | |
| 4863 // atexit functions are called on return from main or as a result of a | |
| 4864 // call to exit(3C). There can be only 32 of these functions registered | |
| 4865 // and atexit() does not set errno. | |
| 4866 | |
| 4867 if (PerfAllowAtExitRegistration) { | |
| 4868 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 4869 // atexit functions can be delayed until process exit time, which | |
| 4870 // can be problematic for embedded VM situations. Embedded VMs should | |
| 4871 // call DestroyJavaVM() to assure that VM resources are released. | |
| 4872 | |
| 4873 // note: perfMemory_exit_helper atexit function may be removed in | |
| 4874 // the future if the appropriate cleanup code can be added to the | |
| 4875 // VM_Exit VMOperation's doit method. | |
| 4876 if (atexit(perfMemory_exit_helper) != 0) { | |
| 14391 | 4877 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); |
| 0 | 4878 } |
| 4879 } | |
| 4880 | |
| 4881 // initialize thread priority policy | |
| 4882 prio_init(); | |
| 4883 | |
| 4884 return JNI_OK; | |
| 4885 } | |
| 4886 | |
| 4887 // Mark the polling page as unreadable | |
| 4888 void os::make_polling_page_unreadable(void) { | |
| 4889 if( !guard_memory((char*)_polling_page, Linux::page_size()) ) | |
| 4890 fatal("Could not disable polling page"); | |
| 4891 }; | |
| 4892 | |
| 4893 // Mark the polling page as readable | |
| 4894 void os::make_polling_page_readable(void) { | |
|
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4895 if( !linux_mprotect((char *)_polling_page, Linux::page_size(), PROT_READ)) { |
| 0 | 4896 fatal("Could not enable polling page"); |
|
237
1fdb98a17101
6716785: implicit null checks not triggering with CompressedOops
coleenp
parents:
235
diff
changeset
|
4897 } |
| 0 | 4898 }; |
| 4899 | |
| 4900 int os::active_processor_count() { | |
| 4901 // Linux doesn't yet have a (official) notion of processor sets, | |
| 4902 // so just return the number of online processors. | |
| 4903 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
| 4904 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
| 4905 return online_cpus; | |
| 4906 } | |
| 4907 | |
| 4006 | 4908 void os::set_native_thread_name(const char *name) { |
| 4909 // Not yet implemented. | |
| 4910 return; | |
| 4911 } | |
| 4912 | |
| 0 | 4913 bool os::distribute_processes(uint length, uint* distribution) { |
| 4914 // Not yet implemented. | |
| 4915 return false; | |
| 4916 } | |
| 4917 | |
| 4918 bool os::bind_to_processor(uint processor_id) { | |
| 4919 // Not yet implemented. | |
| 4920 return false; | |
| 4921 } | |
| 4922 | |
| 4923 /// | |
| 4924 | |
| 10405 | 4925 void os::SuspendedThreadTask::internal_do_task() { |
| 4926 if (do_suspend(_thread->osthread())) { | |
| 4927 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
| 4928 do_task(context); | |
| 4929 do_resume(_thread->osthread()); | |
| 4930 } | |
| 4931 } | |
| 4932 | |
| 4933 class PcFetcher : public os::SuspendedThreadTask { | |
| 4934 public: | |
| 4935 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
| 4936 ExtendedPC result(); | |
| 4937 protected: | |
| 4938 void do_task(const os::SuspendedThreadTaskContext& context); | |
| 4939 private: | |
| 4940 ExtendedPC _epc; | |
| 4941 }; | |
| 4942 | |
| 4943 ExtendedPC PcFetcher::result() { | |
| 4944 guarantee(is_done(), "task is not done yet."); | |
| 4945 return _epc; | |
| 4946 } | |
| 4947 | |
| 4948 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
| 4949 Thread* thread = context.thread(); | |
| 4950 OSThread* osthread = thread->osthread(); | |
| 4951 if (osthread->ucontext() != NULL) { | |
| 4952 _epc = os::Linux::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
| 4953 } else { | |
| 4954 // NULL context is unexpected, double-check this is the VMThread | |
| 4955 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 4956 } | |
| 4957 } | |
| 4958 | |
| 0 | 4959 // Suspends the target using the signal mechanism and then grabs the PC before |
| 4960 // resuming the target. Used by the flat-profiler only | |
| 4961 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 4962 // Make sure that it is called by the watcher for the VMThread | |
| 4963 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 4964 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 4965 | |
| 10405 | 4966 PcFetcher fetcher(thread); |
| 4967 fetcher.run(); | |
| 4968 return fetcher.result(); | |
| 0 | 4969 } |
| 4970 | |
| 4971 int os::Linux::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 4972 { | |
| 4973 if (is_NPTL()) { | |
| 4974 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4975 } else { | |
| 4976 // 6292965: LinuxThreads pthread_cond_timedwait() resets FPU control | |
| 4977 // word back to default 64bit precision if condvar is signaled. Java | |
| 4978 // wants 53bit precision. Save and restore current value. | |
| 4979 int fpu = get_fpu_control_word(); | |
| 4980 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4981 set_fpu_control_word(fpu); | |
| 4982 return status; | |
| 4983 } | |
| 4984 } | |
| 4985 | |
| 4986 //////////////////////////////////////////////////////////////////////////////// | |
| 4987 // debug support | |
| 4988 | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4989 bool os::find(address addr, outputStream* st) { |
| 0 | 4990 Dl_info dlinfo; |
| 4991 memset(&dlinfo, 0, sizeof(dlinfo)); | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4992 if (dladdr(addr, &dlinfo) != 0) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4993 st->print(PTR_FORMAT ": ", addr); |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4994 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4995 st->print("%s+%#x", dlinfo.dli_sname, |
| 0 | 4996 addr - (intptr_t)dlinfo.dli_saddr); |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
4997 } else if (dlinfo.dli_fbase != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
4998 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
| 0 | 4999 } else { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5000 st->print("<absolute address>"); |
| 0 | 5001 } |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5002 if (dlinfo.dli_fname != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5003 st->print(" in %s", dlinfo.dli_fname); |
| 0 | 5004 } |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5005 if (dlinfo.dli_fbase != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5006 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
| 0 | 5007 } |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5008 st->cr(); |
| 0 | 5009 |
| 5010 if (Verbose) { | |
| 5011 // decode some bytes around the PC | |
|
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
5012 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
|
5013 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| 0 | 5014 address lowest = (address) dlinfo.dli_sname; |
| 5015 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 5016 if (begin < lowest) begin = lowest; | |
| 5017 Dl_info dlinfo2; | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
5018 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
| 0 | 5019 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
| 5020 end = (address) dlinfo2.dli_saddr; | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5021 Disassembler::decode(begin, end, st); |
| 0 | 5022 } |
| 5023 return true; | |
| 5024 } | |
| 5025 return false; | |
| 5026 } | |
| 5027 | |
| 5028 //////////////////////////////////////////////////////////////////////////////// | |
| 5029 // misc | |
| 5030 | |
| 5031 // This does not do anything on Linux. This is basically a hook for being | |
| 5032 // able to use structured exception handling (thread-local exception filters) | |
| 5033 // on, e.g., Win32. | |
| 5034 void | |
| 5035 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 5036 JavaCallArguments* args, Thread* thread) { | |
| 5037 f(value, method, args, thread); | |
| 5038 } | |
| 5039 | |
| 5040 void os::print_statistics() { | |
| 5041 } | |
| 5042 | |
| 5043 int os::message_box(const char* title, const char* message) { | |
| 5044 int i; | |
| 5045 fdStream err(defaultStream::error_fd()); | |
| 5046 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 5047 err.cr(); | |
| 5048 err.print_raw_cr(title); | |
| 5049 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 5050 err.cr(); | |
| 5051 err.print_raw_cr(message); | |
| 5052 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 5053 err.cr(); | |
| 5054 | |
| 5055 char buf[16]; | |
| 5056 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 5057 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 5058 | |
| 5059 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 5060 } | |
| 5061 | |
| 5062 int os::stat(const char *path, struct stat *sbuf) { | |
| 5063 char pathbuf[MAX_PATH]; | |
| 5064 if (strlen(path) > MAX_PATH - 1) { | |
| 5065 errno = ENAMETOOLONG; | |
| 5066 return -1; | |
| 5067 } | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5068 os::native_path(strcpy(pathbuf, path)); |
| 0 | 5069 return ::stat(pathbuf, sbuf); |
| 5070 } | |
| 5071 | |
| 5072 bool os::check_heap(bool force) { | |
| 5073 return true; | |
| 5074 } | |
| 5075 | |
| 5076 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 5077 return ::vsnprintf(buf, count, format, args); | |
| 5078 } | |
| 5079 | |
| 5080 // Is a (classpath) directory empty? | |
| 5081 bool os::dir_is_empty(const char* path) { | |
| 5082 DIR *dir = NULL; | |
| 5083 struct dirent *ptr; | |
| 5084 | |
| 5085 dir = opendir(path); | |
| 5086 if (dir == NULL) return true; | |
| 5087 | |
| 5088 /* Scan the directory */ | |
| 5089 bool result = true; | |
| 5090 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 5091 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 5092 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 5093 result = false; | |
| 5094 } | |
| 5095 } | |
| 5096 closedir(dir); | |
| 5097 return result; | |
| 5098 } | |
| 5099 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5100 // This code originates from JDK's sysOpen and open64_w |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5101 // from src/solaris/hpi/src/system_md.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5102 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5103 #ifndef O_DELETE |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5104 #define O_DELETE 0x10000 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5105 #endif |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5106 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5107 // Open a file. Unlink the file immediately after open returns |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5108 // if the specified oflag has the O_DELETE flag set. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5109 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5110 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5111 int os::open(const char *path, int oflag, int mode) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5112 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5113 if (strlen(path) > MAX_PATH - 1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5114 errno = ENAMETOOLONG; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5115 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5116 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5117 int fd; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5118 int o_delete = (oflag & O_DELETE); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5119 oflag = oflag & ~O_DELETE; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5120 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5121 fd = ::open64(path, oflag, mode); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5122 if (fd == -1) return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5123 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5124 //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
|
5125 { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5126 struct stat64 buf64; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5127 int ret = ::fstat64(fd, &buf64); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5128 int st_mode = buf64.st_mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5129 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5130 if (ret != -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5131 if ((st_mode & S_IFMT) == S_IFDIR) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5132 errno = EISDIR; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5133 ::close(fd); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5134 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5135 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5136 } else { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5137 ::close(fd); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5138 return -1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5139 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5140 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5141 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5142 /* |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5143 * All file descriptors that are opened in the JVM and not |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5144 * specifically destined for a subprocess should have the |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5145 * 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
|
5146 * 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
|
5147 * 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
|
5148 * UNIXProcess.c), and this in turn might: |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5149 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5150 * - cause end-of-file to fail to be detected on some file |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5151 * descriptors, resulting in mysterious hangs, or |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5152 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5153 * - might cause an fopen in the subprocess to fail on a system |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5154 * suffering from bug 1085341. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5155 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5156 * (Yes, the default setting of the close-on-exec flag is a Unix |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5157 * design flaw) |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5158 * |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5159 * See: |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5160 * 1085341: 32-bit stdio routines should support file descriptors >255 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5161 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5162 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5163 */ |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5164 #ifdef FD_CLOEXEC |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5165 { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5166 int flags = ::fcntl(fd, F_GETFD); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5167 if (flags != -1) |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5168 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5169 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5170 #endif |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5171 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5172 if (o_delete != 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5173 ::unlink(path); |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5174 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5175 return fd; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5176 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5177 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5178 |
| 0 | 5179 // create binary file, rewriting existing file if required |
| 5180 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 5181 int oflags = O_WRONLY | O_CREAT; | |
| 5182 if (!rewrite_existing) { | |
| 5183 oflags |= O_EXCL; | |
| 5184 } | |
| 5185 return ::open64(path, oflags, S_IREAD | S_IWRITE); | |
| 5186 } | |
| 5187 | |
| 5188 // return current position of file pointer | |
| 5189 jlong os::current_file_offset(int fd) { | |
| 5190 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
| 5191 } | |
| 5192 | |
| 5193 // move file pointer to the specified offset | |
| 5194 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 5195 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
| 5196 } | |
| 5197 | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5198 // This code originates from JDK's sysAvailable |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5199 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5200 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5201 int os::available(int fd, jlong *bytes) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5202 jlong cur, end; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5203 int mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5204 struct stat64 buf64; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5205 |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5206 if (::fstat64(fd, &buf64) >= 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5207 mode = buf64.st_mode; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5208 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5209 /* |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5210 * XXX: is the following call interruptible? If so, this might |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5211 * need to go through the INTERRUPT_IO() wrapper as for other |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5212 * blocking, interruptible calls in this file. |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5213 */ |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5214 int n; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5215 if (::ioctl(fd, FIONREAD, &n) >= 0) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5216 *bytes = n; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5217 return 1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5218 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5219 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5220 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5221 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5222 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5223 } 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
|
5224 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5225 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5226 return 0; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5227 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5228 *bytes = end - cur; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5229 return 1; |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5230 } |
|
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5231 |
|
2033
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5232 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
|
5233 // 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
|
5234 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
|
5235 |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5236 //%% 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
|
5237 // 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
|
5238 return (ret < 0) ? 0 : 1; |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5239 } |
|
03e1b9fce89d
7003707: need to remove (some) system include files from the HotSpot header files
dholmes
parents:
2023
diff
changeset
|
5240 |
| 0 | 5241 // Map a block of memory. |
| 6197 | 5242 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 0 | 5243 char *addr, size_t bytes, bool read_only, |
| 5244 bool allow_exec) { | |
| 5245 int prot; | |
| 5909 | 5246 int flags = MAP_PRIVATE; |
| 0 | 5247 |
| 5248 if (read_only) { | |
| 5249 prot = PROT_READ; | |
| 5250 } else { | |
| 5251 prot = PROT_READ | PROT_WRITE; | |
| 5252 } | |
| 5253 | |
| 5254 if (allow_exec) { | |
| 5255 prot |= PROT_EXEC; | |
| 5256 } | |
| 5257 | |
| 5258 if (addr != NULL) { | |
| 5259 flags |= MAP_FIXED; | |
| 5260 } | |
| 5261 | |
| 5262 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 5263 fd, file_offset); | |
| 5264 if (mapped_address == MAP_FAILED) { | |
| 5265 return NULL; | |
| 5266 } | |
| 5267 return mapped_address; | |
| 5268 } | |
| 5269 | |
| 5270 | |
| 5271 // Remap a block of memory. | |
| 6197 | 5272 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 0 | 5273 char *addr, size_t bytes, bool read_only, |
| 5274 bool allow_exec) { | |
| 5275 // same as map_memory() on this OS | |
| 5276 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 5277 allow_exec); | |
| 5278 } | |
| 5279 | |
| 5280 | |
| 5281 // Unmap a block of memory. | |
| 6197 | 5282 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 0 | 5283 return munmap(addr, bytes) == 0; |
| 5284 } | |
| 5285 | |
| 5286 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
| 5287 | |
| 5288 static clockid_t thread_cpu_clockid(Thread* thread) { | |
| 5289 pthread_t tid = thread->osthread()->pthread_id(); | |
| 5290 clockid_t clockid; | |
| 5291 | |
| 5292 // Get thread clockid | |
| 5293 int rc = os::Linux::pthread_getcpuclockid(tid, &clockid); | |
| 5294 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
| 5295 return clockid; | |
| 5296 } | |
| 5297 | |
| 5298 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 5299 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 5300 // of a thread. | |
| 5301 // | |
| 5302 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 5303 // the fast estimate available on the platform. | |
| 5304 | |
| 5305 jlong os::current_thread_cpu_time() { | |
| 5306 if (os::Linux::supports_fast_thread_cpu_time()) { | |
| 5307 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 5308 } else { | |
| 5309 // return user + sys since the cost is the same | |
| 5310 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 5311 } | |
| 5312 } | |
| 5313 | |
| 5314 jlong os::thread_cpu_time(Thread* thread) { | |
| 5315 // consistent with what current_thread_cpu_time() returns | |
| 5316 if (os::Linux::supports_fast_thread_cpu_time()) { | |
| 5317 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 5318 } else { | |
| 5319 return slow_thread_cpu_time(thread, true /* user + sys */); | |
| 5320 } | |
| 5321 } | |
| 5322 | |
| 5323 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 5324 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
| 5325 return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 5326 } else { | |
| 5327 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 5328 } | |
| 5329 } | |
| 5330 | |
| 5331 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 5332 if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) { | |
| 5333 return os::Linux::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 5334 } else { | |
| 5335 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
| 5336 } | |
| 5337 } | |
| 5338 | |
| 5339 // | |
| 5340 // -1 on error. | |
| 5341 // | |
| 5342 | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
5343 PRAGMA_DIAG_PUSH |
|
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
5344 PRAGMA_FORMAT_NONLITERAL_IGNORED |
| 0 | 5345 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { |
| 5346 static bool proc_task_unchecked = true; | |
| 5347 static const char *proc_stat_path = "/proc/%d/stat"; | |
| 5348 pid_t tid = thread->osthread()->thread_id(); | |
| 5349 char *s; | |
| 5350 char stat[2048]; | |
| 5351 int statlen; | |
| 5352 char proc_name[64]; | |
| 5353 int count; | |
| 5354 long sys_time, user_time; | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5355 char cdummy; |
| 0 | 5356 int idummy; |
| 5357 long ldummy; | |
| 5358 FILE *fp; | |
| 5359 | |
| 5360 // The /proc/<tid>/stat aggregates per-process usage on | |
| 5361 // new Linux kernels 2.6+ where NPTL is supported. | |
| 5362 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
| 5363 // 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
|
5364 // 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
|
5365 // /proc/self/task, so we check its availability. |
| 0 | 5366 if (proc_task_unchecked && os::Linux::is_NPTL()) { |
| 5367 // This is executed only once | |
| 5368 proc_task_unchecked = false; | |
| 5369 fp = fopen("/proc/self/task", "r"); | |
| 5370 if (fp != NULL) { | |
| 5371 proc_stat_path = "/proc/self/task/%d/stat"; | |
| 5372 fclose(fp); | |
| 5373 } | |
| 5374 } | |
| 5375 | |
| 5376 sprintf(proc_name, proc_stat_path, tid); | |
| 5377 fp = fopen(proc_name, "r"); | |
| 5378 if ( fp == NULL ) return -1; | |
| 5379 statlen = fread(stat, 1, 2047, fp); | |
| 5380 stat[statlen] = '\0'; | |
| 5381 fclose(fp); | |
| 5382 | |
| 5383 // Skip pid and the command string. Note that we could be dealing with | |
| 5384 // weird command names, e.g. user could decide to rename java launcher | |
| 5385 // to "java 1.4.2 :)", then the stat file would look like | |
| 5386 // 1234 (java 1.4.2 :)) R ... ... | |
| 5387 // We don't really need to know the command string, just find the last | |
| 5388 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 5389 s = strrchr(stat, ')'); | |
| 5390 if (s == NULL ) return -1; | |
| 5391 | |
| 5392 // Skip blank chars | |
| 5393 do s++; while (isspace(*s)); | |
| 5394 | |
|
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126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
5395 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", |
|
126ea7725993
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diff
changeset
|
5396 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, |
| 0 | 5397 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, |
| 5398 &user_time, &sys_time); | |
|
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diff
changeset
|
5399 if ( count != 13 ) return -1; |
| 0 | 5400 if (user_sys_cpu_time) { |
| 5401 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
| 5402 } else { | |
| 5403 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
| 5404 } | |
| 5405 } | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17848
diff
changeset
|
5406 PRAGMA_DIAG_POP |
| 0 | 5407 |
| 5408 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5409 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5410 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5411 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5412 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5413 } | |
| 5414 | |
| 5415 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5416 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5417 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5418 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5419 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5420 } | |
| 5421 | |
| 5422 bool os::is_thread_cpu_time_supported() { | |
| 5423 return true; | |
| 5424 } | |
| 5425 | |
| 5426 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 5427 // Linux doesn't yet have a (official) notion of processor sets, | |
| 5428 // so just return the system wide load average. | |
| 5429 int os::loadavg(double loadavg[], int nelem) { | |
| 5430 return ::getloadavg(loadavg, nelem); | |
| 5431 } | |
| 5432 | |
| 5433 void os::pause() { | |
| 5434 char filename[MAX_PATH]; | |
| 5435 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 5436 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 5437 } else { | |
| 5438 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 5439 } | |
| 5440 | |
| 5441 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 5442 if (fd != -1) { | |
| 5443 struct stat buf; | |
|
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
5444 ::close(fd); |
| 0 | 5445 while (::stat(filename, &buf) == 0) { |
| 5446 (void)::poll(NULL, 0, 100); | |
| 5447 } | |
| 5448 } else { | |
| 5449 jio_fprintf(stderr, | |
| 5450 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 5451 } | |
| 5452 } | |
| 5453 | |
| 5454 | |
| 5455 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 5456 // | |
| 5457 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 5458 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 5459 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 5460 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 5461 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 5462 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 5463 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 5464 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 5465 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 5466 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 5467 // of libpthread avoids the problem, but isn't practical. | |
| 5468 // | |
| 5469 // Possible remedies: | |
| 5470 // | |
| 5471 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 5472 // This is palliative and probabilistic, however. If the thread is preempted | |
| 5473 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 5474 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 5475 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 5476 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 5477 // | |
| 5478 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 5479 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 5480 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 5481 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 5482 // thread. | |
| 5483 // | |
| 5484 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 5485 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 5486 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 5487 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 5488 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 5489 // timers in a graceful fashion. | |
| 5490 // | |
| 5491 // 4. When the abstime value is in the past it appears that control returns | |
| 5492 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 5493 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 5494 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 5495 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 5496 // It may be possible to avoid reinitialization by checking the return | |
| 5497 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 5498 // condvar we must establish the invariant that cond_signal() is only called | |
| 5499 // within critical sections protected by the adjunct mutex. This prevents | |
| 5500 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 5501 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 5502 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 5503 // | |
| 5504 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 5505 // structure when a condvar is used or initialized. cond_destroy() would | |
| 5506 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 5507 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 5508 // | |
| 5509 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 5510 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 5511 // and only enabling the work-around for vulnerable environments. | |
| 5512 | |
| 5513 // utility to compute the abstime argument to timedwait: | |
| 5514 // millis is the relative timeout time | |
| 5515 // abstime will be the absolute timeout time | |
| 5516 // TODO: replace compute_abstime() with unpackTime() | |
| 5517 | |
| 5518 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
| 5519 if (millis < 0) millis = 0; | |
|
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diff
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|
5520 |
| 0 | 5521 jlong seconds = millis / 1000; |
| 5522 millis %= 1000; | |
| 5523 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 5524 seconds = 50000000; | |
| 5525 } | |
|
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diff
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|
5526 |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
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|
5527 if (os::Linux::supports_monotonic_clock()) { |
|
2e6938dd68f2
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12182
diff
changeset
|
5528 struct timespec now; |
|
2e6938dd68f2
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12182
diff
changeset
|
5529 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
|
2e6938dd68f2
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diff
changeset
|
5530 assert_status(status == 0, status, "clock_gettime"); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5531 abstime->tv_sec = now.tv_sec + seconds; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5532 long nanos = now.tv_nsec + millis * NANOSECS_PER_MILLISEC; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5533 if (nanos >= NANOSECS_PER_SEC) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5534 abstime->tv_sec += 1; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5535 nanos -= NANOSECS_PER_SEC; |
|
2e6938dd68f2
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12182
diff
changeset
|
5536 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5537 abstime->tv_nsec = nanos; |
|
2e6938dd68f2
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12182
diff
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|
5538 } else { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5539 struct timeval now; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5540 int status = gettimeofday(&now, NULL); |
|
2e6938dd68f2
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12182
diff
changeset
|
5541 assert(status == 0, "gettimeofday"); |
|
2e6938dd68f2
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12182
diff
changeset
|
5542 abstime->tv_sec = now.tv_sec + seconds; |
|
2e6938dd68f2
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12182
diff
changeset
|
5543 long usec = now.tv_usec + millis * 1000; |
|
2e6938dd68f2
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12182
diff
changeset
|
5544 if (usec >= 1000000) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5545 abstime->tv_sec += 1; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5546 usec -= 1000000; |
|
2e6938dd68f2
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12182
diff
changeset
|
5547 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
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12182
diff
changeset
|
5548 abstime->tv_nsec = usec * 1000; |
|
2e6938dd68f2
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12182
diff
changeset
|
5549 } |
| 0 | 5550 return abstime; |
| 5551 } | |
| 5552 | |
| 5553 | |
| 5554 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 5555 // Conceptually TryPark() should be equivalent to park(0). | |
| 5556 | |
| 5557 int os::PlatformEvent::TryPark() { | |
| 5558 for (;;) { | |
| 5559 const int v = _Event ; | |
| 5560 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 5561 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 5562 } | |
| 5563 } | |
| 5564 | |
| 5565 void os::PlatformEvent::park() { // AKA "down()" | |
| 5566 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 5567 // may call park(). | |
| 5568 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 5569 int v ; | |
| 5570 for (;;) { | |
| 5571 v = _Event ; | |
| 5572 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5573 } | |
| 5574 guarantee (v >= 0, "invariant") ; | |
| 5575 if (v == 0) { | |
| 5576 // Do this the hard way by blocking ... | |
| 5577 int status = pthread_mutex_lock(_mutex); | |
| 5578 assert_status(status == 0, status, "mutex_lock"); | |
| 5579 guarantee (_nParked == 0, "invariant") ; | |
| 5580 ++ _nParked ; | |
| 5581 while (_Event < 0) { | |
| 5582 status = pthread_cond_wait(_cond, _mutex); | |
| 5583 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 5584 // Treat this the same as if the wait was interrupted | |
| 5585 if (status == ETIME) { status = EINTR; } | |
| 5586 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 5587 } | |
| 5588 -- _nParked ; | |
| 5589 | |
| 5590 _Event = 0 ; | |
| 5591 status = pthread_mutex_unlock(_mutex); | |
| 5592 assert_status(status == 0, status, "mutex_unlock"); | |
|
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7456
diff
changeset
|
5593 // Paranoia to ensure our locked and lock-free paths interact |
|
22ba8c8ce6a6
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7456
diff
changeset
|
5594 // correctly with each other. |
|
22ba8c8ce6a6
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7456
diff
changeset
|
5595 OrderAccess::fence(); |
| 0 | 5596 } |
| 5597 guarantee (_Event >= 0, "invariant") ; | |
| 5598 } | |
| 5599 | |
| 5600 int os::PlatformEvent::park(jlong millis) { | |
| 5601 guarantee (_nParked == 0, "invariant") ; | |
| 5602 | |
| 5603 int v ; | |
| 5604 for (;;) { | |
| 5605 v = _Event ; | |
| 5606 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5607 } | |
| 5608 guarantee (v >= 0, "invariant") ; | |
| 5609 if (v != 0) return OS_OK ; | |
| 5610 | |
| 5611 // We do this the hard way, by blocking the thread. | |
| 5612 // Consider enforcing a minimum timeout value. | |
| 5613 struct timespec abst; | |
| 5614 compute_abstime(&abst, millis); | |
| 5615 | |
| 5616 int ret = OS_TIMEOUT; | |
| 5617 int status = pthread_mutex_lock(_mutex); | |
| 5618 assert_status(status == 0, status, "mutex_lock"); | |
| 5619 guarantee (_nParked == 0, "invariant") ; | |
| 5620 ++_nParked ; | |
| 5621 | |
| 5622 // Object.wait(timo) will return because of | |
| 5623 // (a) notification | |
| 5624 // (b) timeout | |
| 5625 // (c) thread.interrupt | |
| 5626 // | |
| 5627 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 5628 // That is, we treat thread.interrupt as a special case of notification. | |
| 5629 // The underlying Solaris implementation, cond_timedwait, admits | |
| 5630 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 5631 // JVM from making those visible to Java code. As such, we must | |
| 5632 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 5633 // | |
| 5634 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 5635 // In that case, we should propagate the notify to another waiter. | |
| 5636 | |
| 5637 while (_Event < 0) { | |
| 5638 status = os::Linux::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 5639 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5640 pthread_cond_destroy (_cond); | |
|
12211
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12182
diff
changeset
|
5641 pthread_cond_init (_cond, os::Linux::condAttr()) ; |
| 0 | 5642 } |
| 5643 assert_status(status == 0 || status == EINTR || | |
| 5644 status == ETIME || status == ETIMEDOUT, | |
| 5645 status, "cond_timedwait"); | |
| 5646 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 5647 if (status == ETIME || status == ETIMEDOUT) break ; | |
| 5648 // We consume and ignore EINTR and spurious wakeups. | |
| 5649 } | |
| 5650 --_nParked ; | |
| 5651 if (_Event >= 0) { | |
| 5652 ret = OS_OK; | |
| 5653 } | |
| 5654 _Event = 0 ; | |
| 5655 status = pthread_mutex_unlock(_mutex); | |
| 5656 assert_status(status == 0, status, "mutex_unlock"); | |
| 5657 assert (_nParked == 0, "invariant") ; | |
|
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|
5658 // Paranoia to ensure our locked and lock-free paths interact |
|
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diff
changeset
|
5659 // correctly with each other. |
|
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7456
diff
changeset
|
5660 OrderAccess::fence(); |
| 0 | 5661 return ret; |
| 5662 } | |
| 5663 | |
| 5664 void os::PlatformEvent::unpark() { | |
|
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diff
changeset
|
5665 // Transitions for _Event: |
|
22ba8c8ce6a6
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dcubed
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7456
diff
changeset
|
5666 // 0 :=> 1 |
|
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
5667 // 1 :=> 1 |
|
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
5668 // -1 :=> either 0 or 1; must signal target thread |
|
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
5669 // That is, we can safely transition _Event from -1 to either |
|
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
5670 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
|
22ba8c8ce6a6
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dcubed
parents:
7456
diff
changeset
|
5671 // unpark() calls. |
|
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|
5672 // See also: "Semaphores in Plan 9" by Mullender & Cox |
|
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|
5673 // |
|
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|
5674 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
|
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|
5675 // that it will take two back-to-back park() calls for the owning |
|
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|
5676 // thread to block. This has the benefit of forcing a spurious return |
|
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|
5677 // from the first park() call after an unpark() call which will help |
|
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|
5678 // shake out uses of park() and unpark() without condition variables. |
|
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|
5679 |
|
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|
5680 if (Atomic::xchg(1, &_Event) >= 0) return; |
|
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|
5681 |
|
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|
5682 // Wait for the thread associated with the event to vacate |
|
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|
5683 int status = pthread_mutex_lock(_mutex); |
|
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|
5684 assert_status(status == 0, status, "mutex_lock"); |
|
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|
5685 int AnyWaiters = _nParked; |
|
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|
5686 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
|
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|
5687 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
|
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|
5688 AnyWaiters = 0; |
|
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|
5689 pthread_cond_signal(_cond); |
|
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|
5690 } |
|
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|
5691 status = pthread_mutex_unlock(_mutex); |
|
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|
5692 assert_status(status == 0, status, "mutex_unlock"); |
|
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|
5693 if (AnyWaiters != 0) { |
|
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|
5694 status = pthread_cond_signal(_cond); |
|
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|
5695 assert_status(status == 0, status, "cond_signal"); |
| 0 | 5696 } |
| 5697 | |
| 5698 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 5699 // This is safe and avoids a common class of futile wakeups. In rare | |
| 5700 // circumstances this can cause a thread to return prematurely from | |
| 5701 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 5702 // simply re-test the condition and re-park itself. | |
| 5703 } | |
| 5704 | |
| 5705 | |
| 5706 // JSR166 | |
| 5707 // ------------------------------------------------------- | |
| 5708 | |
| 5709 /* | |
| 5710 * The solaris and linux implementations of park/unpark are fairly | |
| 5711 * conservative for now, but can be improved. They currently use a | |
| 5712 * mutex/condvar pair, plus a a count. | |
| 5713 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 5714 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 5715 * on the condvar. Contention seen when trying to park implies that someone | |
| 5716 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 5717 * is no need to track notifications. | |
| 5718 */ | |
| 5719 | |
| 5720 /* | |
| 5721 * This code is common to linux and solaris and will be moved to a | |
| 5722 * common place in dolphin. | |
| 5723 * | |
| 5724 * The passed in time value is either a relative time in nanoseconds | |
| 5725 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 5726 * into suitable seconds and nanoseconds components and stored in the | |
| 5727 * given timespec structure. | |
| 5728 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 5729 * a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
| 5730 * overflow if times way in the future are given. Further on Solaris versions | |
| 5731 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 5732 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 5733 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 5734 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 5735 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 5736 * years from "now". | |
| 5737 */ | |
| 5738 | |
| 5739 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
| 5740 assert (time > 0, "convertTime"); | |
|
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|
5741 time_t max_secs = 0; |
|
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5742 |
|
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|
5743 if (!os::Linux::supports_monotonic_clock() || isAbsolute) { |
|
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|
5744 struct timeval now; |
|
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|
5745 int status = gettimeofday(&now, NULL); |
|
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|
5746 assert(status == 0, "gettimeofday"); |
|
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|
5747 |
|
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|
5748 max_secs = now.tv_sec + MAX_SECS; |
|
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|
5749 |
|
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|
5750 if (isAbsolute) { |
|
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|
5751 jlong secs = time / 1000; |
|
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|
5752 if (secs > max_secs) { |
|
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|
5753 absTime->tv_sec = max_secs; |
|
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|
5754 } else { |
|
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|
5755 absTime->tv_sec = secs; |
|
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|
5756 } |
|
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|
5757 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; |
|
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|
5758 } else { |
|
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|
5759 jlong secs = time / NANOSECS_PER_SEC; |
|
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|
5760 if (secs >= MAX_SECS) { |
|
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|
5761 absTime->tv_sec = max_secs; |
|
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|
5762 absTime->tv_nsec = 0; |
|
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|
5763 } else { |
|
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|
5764 absTime->tv_sec = now.tv_sec + secs; |
|
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|
5765 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; |
|
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|
5766 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
|
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|
5767 absTime->tv_nsec -= NANOSECS_PER_SEC; |
|
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|
5768 ++absTime->tv_sec; // note: this must be <= max_secs |
|
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|
5769 } |
|
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|
5770 } |
| 0 | 5771 } |
|
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|
5772 } else { |
|
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|
5773 // must be relative using monotonic clock |
|
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|
5774 struct timespec now; |
|
2e6938dd68f2
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|
5775 int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now); |
|
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|
5776 assert_status(status == 0, status, "clock_gettime"); |
|
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|
5777 max_secs = now.tv_sec + MAX_SECS; |
| 0 | 5778 jlong secs = time / NANOSECS_PER_SEC; |
| 5779 if (secs >= MAX_SECS) { | |
| 5780 absTime->tv_sec = max_secs; | |
| 5781 absTime->tv_nsec = 0; | |
|
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|
5782 } else { |
| 0 | 5783 absTime->tv_sec = now.tv_sec + secs; |
|
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|
5784 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_nsec; |
| 0 | 5785 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { |
| 5786 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 5787 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 5788 } | |
| 5789 } | |
| 5790 } | |
| 5791 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 5792 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 5793 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 5794 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 5795 } | |
| 5796 | |
| 5797 void Parker::park(bool isAbsolute, jlong time) { | |
|
7629
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|
5798 // Ideally we'd do something useful while spinning, such |
|
22ba8c8ce6a6
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|
5799 // as calling unpackTime(). |
|
22ba8c8ce6a6
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diff
changeset
|
5800 |
| 0 | 5801 // Optional fast-path check: |
| 5802 // Return immediately if a permit is available. | |
|
7629
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|
5803 // We depend on Atomic::xchg() having full barrier semantics |
|
22ba8c8ce6a6
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|
5804 // since we are doing a lock-free update to _counter. |
|
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diff
changeset
|
5805 if (Atomic::xchg(0, &_counter) > 0) return; |
| 0 | 5806 |
| 5807 Thread* thread = Thread::current(); | |
| 5808 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 5809 JavaThread *jt = (JavaThread *)thread; | |
| 5810 | |
| 5811 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 5812 // Check interrupt before trying to wait | |
| 5813 if (Thread::is_interrupted(thread, false)) { | |
| 5814 return; | |
| 5815 } | |
| 5816 | |
| 5817 // Next, demultiplex/decode time arguments | |
| 5818 timespec absTime; | |
|
1865
1c352af0135d
6763959: java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
acorn
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1750
diff
changeset
|
5819 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all |
| 0 | 5820 return; |
| 5821 } | |
| 5822 if (time > 0) { | |
| 5823 unpackTime(&absTime, isAbsolute, time); | |
| 5824 } | |
| 5825 | |
| 5826 | |
| 5827 // Enter safepoint region | |
| 5828 // Beware of deadlocks such as 6317397. | |
| 5829 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 5830 // In particular a thread must never block on the Threads_lock while | |
| 5831 // holding the Parker:: mutex. If safepoints are pending both the | |
| 5832 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 5833 ThreadBlockInVM tbivm(jt); | |
| 5834 | |
| 5835 // Don't wait if cannot get lock since interference arises from | |
| 5836 // unblocking. Also. check interrupt before trying wait | |
| 5837 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 5838 return; | |
| 5839 } | |
| 5840 | |
| 5841 int status ; | |
| 5842 if (_counter > 0) { // no wait needed | |
| 5843 _counter = 0; | |
| 5844 status = pthread_mutex_unlock(_mutex); | |
| 5845 assert (status == 0, "invariant") ; | |
|
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|
5846 // Paranoia to ensure our locked and lock-free paths interact |
|
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changeset
|
5847 // correctly with each other and Java-level accesses. |
|
1117
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6822370: ReentrantReadWriteLock: threads hung when there are no threads holding onto the lock (Netra x4450)
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1010
diff
changeset
|
5848 OrderAccess::fence(); |
| 0 | 5849 return; |
| 5850 } | |
| 5851 | |
| 5852 #ifdef ASSERT | |
| 5853 // Don't catch signals while blocked; let the running threads have the signals. | |
| 5854 // (This allows a debugger to break into the running thread.) | |
| 5855 sigset_t oldsigs; | |
| 5856 sigset_t* allowdebug_blocked = os::Linux::allowdebug_blocked_signals(); | |
| 5857 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 5858 #endif | |
| 5859 | |
| 5860 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 5861 jt->set_suspend_equivalent(); | |
| 5862 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 5863 | |
|
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|
5864 assert(_cur_index == -1, "invariant"); |
| 0 | 5865 if (time == 0) { |
|
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|
5866 _cur_index = REL_INDEX; // arbitrary choice when not timed |
|
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|
5867 status = pthread_cond_wait (&_cond[_cur_index], _mutex) ; |
| 0 | 5868 } else { |
|
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|
5869 _cur_index = isAbsolute ? ABS_INDEX : REL_INDEX; |
|
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|
5870 status = os::Linux::safe_cond_timedwait (&_cond[_cur_index], _mutex, &absTime) ; |
| 0 | 5871 if (status != 0 && WorkAroundNPTLTimedWaitHang) { |
|
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12182
diff
changeset
|
5872 pthread_cond_destroy (&_cond[_cur_index]) ; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5873 pthread_cond_init (&_cond[_cur_index], isAbsolute ? NULL : os::Linux::condAttr()); |
| 0 | 5874 } |
| 5875 } | |
|
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5876 _cur_index = -1; |
| 0 | 5877 assert_status(status == 0 || status == EINTR || |
| 5878 status == ETIME || status == ETIMEDOUT, | |
| 5879 status, "cond_timedwait"); | |
| 5880 | |
| 5881 #ifdef ASSERT | |
| 5882 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 5883 #endif | |
| 5884 | |
| 5885 _counter = 0 ; | |
| 5886 status = pthread_mutex_unlock(_mutex) ; | |
| 5887 assert_status(status == 0, status, "invariant") ; | |
|
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5888 // 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
|
5889 // correctly with each other and Java-level accesses. |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5890 OrderAccess::fence(); |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7456
diff
changeset
|
5891 |
| 0 | 5892 // If externally suspended while waiting, re-suspend |
| 5893 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 5894 jt->java_suspend_self(); | |
| 5895 } | |
| 5896 } | |
| 5897 | |
| 5898 void Parker::unpark() { | |
| 5899 int s, status ; | |
| 5900 status = pthread_mutex_lock(_mutex); | |
| 5901 assert (status == 0, "invariant") ; | |
| 5902 s = _counter; | |
| 5903 _counter = 1; | |
| 5904 if (s < 1) { | |
|
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5905 // thread might be parked |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5906 if (_cur_index != -1) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5907 // thread is definitely parked |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5908 if (WorkAroundNPTLTimedWaitHang) { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5909 status = pthread_cond_signal (&_cond[_cur_index]); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5910 assert (status == 0, "invariant"); |
| 0 | 5911 status = pthread_mutex_unlock(_mutex); |
|
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5912 assert (status == 0, "invariant"); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5913 } else { |
| 0 | 5914 status = pthread_mutex_unlock(_mutex); |
|
12211
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5915 assert (status == 0, "invariant"); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5916 status = pthread_cond_signal (&_cond[_cur_index]); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5917 assert (status == 0, "invariant"); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5918 } |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5919 } else { |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5920 pthread_mutex_unlock(_mutex); |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5921 assert (status == 0, "invariant") ; |
|
2e6938dd68f2
6900441: PlatformEvent.park(millis) on Linux could still be affected by changes to the time-of-day clock
dholmes
parents:
12182
diff
changeset
|
5922 } |
| 0 | 5923 } else { |
| 5924 pthread_mutex_unlock(_mutex); | |
| 5925 assert (status == 0, "invariant") ; | |
| 5926 } | |
| 5927 } | |
| 5928 | |
| 5929 | |
| 5930 extern char** environ; | |
| 5931 | |
| 5932 #ifndef __NR_fork | |
| 5933 #define __NR_fork IA32_ONLY(2) IA64_ONLY(not defined) AMD64_ONLY(57) | |
| 5934 #endif | |
| 5935 | |
| 5936 #ifndef __NR_execve | |
| 5937 #define __NR_execve IA32_ONLY(11) IA64_ONLY(1033) AMD64_ONLY(59) | |
| 5938 #endif | |
| 5939 | |
| 5940 // Run the specified command in a separate process. Return its exit value, | |
| 5941 // or -1 on failure (e.g. can't fork a new process). | |
| 5942 // Unlike system(), this function can be called from signal handler. It | |
| 5943 // doesn't block SIGINT et al. | |
| 5944 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
|
5945 const char * argv[4] = {"sh", "-c", cmd, NULL}; |
| 0 | 5946 |
| 5947 // fork() in LinuxThreads/NPTL is not async-safe. It needs to run | |
| 5948 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 5949 // separate process to execve. Make a direct syscall to fork process. | |
| 5950 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 5951 // the best... | |
| 5952 pid_t pid = NOT_IA64(syscall(__NR_fork);) | |
| 5953 IA64_ONLY(fork();) | |
| 5954 | |
| 5955 if (pid < 0) { | |
| 5956 // fork failed | |
| 5957 return -1; | |
| 5958 | |
| 5959 } else if (pid == 0) { | |
| 5960 // child process | |
| 5961 | |
| 5962 // execve() in LinuxThreads will call pthread_kill_other_threads_np() | |
| 5963 // first to kill every thread on the thread list. Because this list is | |
| 5964 // not reset by fork() (see notes above), execve() will instead kill | |
| 5965 // every thread in the parent process. We know this is the only thread | |
| 5966 // in the new process, so make a system call directly. | |
| 5967 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 5968 // above. | |
| 5969 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
|
5970 IA64_ONLY(execve("/bin/sh", (char* const*)argv, environ);) |
| 0 | 5971 |
| 5972 // execve failed | |
| 5973 _exit(-1); | |
| 5974 | |
| 5975 } else { | |
| 5976 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 5977 // care about the actual exit code, for now. | |
| 5978 | |
| 5979 int status; | |
| 5980 | |
| 5981 // Wait for the child process to exit. This returns immediately if | |
| 5982 // the child has already exited. */ | |
| 5983 while (waitpid(pid, &status, 0) < 0) { | |
| 5984 switch (errno) { | |
| 5985 case ECHILD: return 0; | |
| 5986 case EINTR: break; | |
| 5987 default: return -1; | |
| 5988 } | |
| 5989 } | |
| 5990 | |
| 5991 if (WIFEXITED(status)) { | |
| 5992 // The child exited normally; get its exit code. | |
| 5993 return WEXITSTATUS(status); | |
| 5994 } else if (WIFSIGNALED(status)) { | |
| 5995 // The child exited because of a signal | |
| 5996 // The best value to return is 0x80 + signal number, | |
| 5997 // because that is what all Unix shells do, and because | |
| 5998 // it allows callers to distinguish between process exit and | |
| 5999 // process death by signal. | |
| 6000 return 0x80 + WTERMSIG(status); | |
| 6001 } else { | |
| 6002 // Unknown exit code; pass it through | |
| 6003 return status; | |
| 6004 } | |
| 6005 } | |
| 6006 } | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6007 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6008 // is_headless_jre() |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6009 // |
|
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6010 // 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
|
6011 // 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
|
6012 // |
|
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6013 // 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
|
6014 // 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
|
6015 // |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6016 bool os::is_headless_jre() { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6017 struct stat statbuf; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6018 char buf[MAXPATHLEN]; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6019 char libmawtpath[MAXPATHLEN]; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6020 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
|
6021 const char *new_xawtstr = "/libawt_xawt.so"; |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6022 char *p; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6023 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6024 // Get path to libjvm.so |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6025 os::jvm_path(buf, sizeof(buf)); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6026 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6027 // Get rid of libjvm.so |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6028 p = strrchr(buf, '/'); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6029 if (p == NULL) return false; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6030 else *p = '\0'; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6031 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6032 // Get rid of client or server |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6033 p = strrchr(buf, '/'); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6034 if (p == NULL) return false; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6035 else *p = '\0'; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6036 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6037 // check xawt/libmawt.so |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6038 strcpy(libmawtpath, buf); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6039 strcat(libmawtpath, xawtstr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6040 if (::stat(libmawtpath, &statbuf) == 0) return false; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6041 |
|
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
6042 // check libawt_xawt.so |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6043 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
|
6044 strcat(libmawtpath, new_xawtstr); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6045 if (::stat(libmawtpath, &statbuf) == 0) return false; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6046 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6047 return true; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6048 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
6049 |
|
6200
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6050 // Get the default path to the core file |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6051 // Returns the length of the string |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6052 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
|
6053 const char* p = get_current_directory(buffer, bufferSize); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6054 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6055 if (p == NULL) { |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6056 assert(p != NULL, "failed to get current directory"); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6057 return 0; |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6058 } |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6059 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6060 return strlen(buffer); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
6061 } |
|
3802
b0b8491925fe
7061212: use o/s low memory notification in embedded builds
jcoomes
parents:
3800
diff
changeset
|
6062 |
|
12110
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6063 /////////////// Unit tests /////////////// |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6064 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6065 #ifndef PRODUCT |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6066 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6067 #define test_log(...) \ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6068 do {\ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6069 if (VerboseInternalVMTests) { \ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6070 tty->print_cr(__VA_ARGS__); \ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6071 tty->flush(); \ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6072 }\ |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6073 } while (false) |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6074 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6075 class TestReserveMemorySpecial : AllStatic { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6076 public: |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6077 static void small_page_write(void* addr, size_t size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6078 size_t page_size = os::vm_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
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diff
changeset
|
6079 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6080 char* end = (char*)addr + size; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6081 for (char* p = (char*)addr; p < end; p += page_size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6082 *p = 1; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6083 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6084 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6085 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6086 static void test_reserve_memory_special_huge_tlbfs_only(size_t size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6087 if (!UseHugeTLBFS) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6088 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6089 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6090 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6091 test_log("test_reserve_memory_special_huge_tlbfs_only(" SIZE_FORMAT ")", size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6092 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6093 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_only(size, NULL, false); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6094 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6095 if (addr != NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6096 small_page_write(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6097 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6098 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6099 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6100 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6101 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6102 static void test_reserve_memory_special_huge_tlbfs_only() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6103 if (!UseHugeTLBFS) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6104 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6105 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6106 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6107 size_t lp = os::large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6108 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6109 for (size_t size = lp; size <= lp * 10; size += lp) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6110 test_reserve_memory_special_huge_tlbfs_only(size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6111 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6112 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6113 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6114 static void test_reserve_memory_special_huge_tlbfs_mixed(size_t size, size_t alignment) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6115 if (!UseHugeTLBFS) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6116 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6117 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6118 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6119 test_log("test_reserve_memory_special_huge_tlbfs_mixed(" SIZE_FORMAT ", " SIZE_FORMAT ")", |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6120 size, alignment); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6121 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6122 assert(size >= os::large_page_size(), "Incorrect input to test"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6123 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6124 char* addr = os::Linux::reserve_memory_special_huge_tlbfs_mixed(size, alignment, NULL, false); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6125 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6126 if (addr != NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6127 small_page_write(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6128 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6129 os::Linux::release_memory_special_huge_tlbfs(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6130 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6131 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6132 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6133 static void test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(size_t size) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6134 size_t lp = os::large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6135 size_t ag = os::vm_allocation_granularity(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6136 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6137 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6138 test_reserve_memory_special_huge_tlbfs_mixed(size, alignment); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6139 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6140 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6141 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6142 static void test_reserve_memory_special_huge_tlbfs_mixed() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6143 size_t lp = os::large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6144 size_t ag = os::vm_allocation_granularity(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6145 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6146 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6147 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + ag); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6148 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp + lp / 2); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6149 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6150 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + ag); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6151 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 - ag); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6152 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 2 + lp / 2); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6153 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6154 test_reserve_memory_special_huge_tlbfs_mixed_all_alignments(lp * 10 + lp / 2); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6155 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6156 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6157 static void test_reserve_memory_special_huge_tlbfs() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6158 if (!UseHugeTLBFS) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6159 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6160 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6161 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6162 test_reserve_memory_special_huge_tlbfs_only(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6163 test_reserve_memory_special_huge_tlbfs_mixed(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6164 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6165 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6166 static void test_reserve_memory_special_shm(size_t size, size_t alignment) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6167 if (!UseSHM) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6168 return; |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6169 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6170 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6171 test_log("test_reserve_memory_special_shm(" SIZE_FORMAT ", " SIZE_FORMAT ")", size, alignment); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6172 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6173 char* addr = os::Linux::reserve_memory_special_shm(size, alignment, NULL, false); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6174 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6175 if (addr != NULL) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6176 assert(is_ptr_aligned(addr, alignment), "Check"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6177 assert(is_ptr_aligned(addr, os::large_page_size()), "Check"); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6178 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6179 small_page_write(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6180 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6181 os::Linux::release_memory_special_shm(addr, size); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6182 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6183 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6184 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6185 static void test_reserve_memory_special_shm() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6186 size_t lp = os::large_page_size(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6187 size_t ag = os::vm_allocation_granularity(); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6188 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6189 for (size_t size = ag; size < lp * 3; size += ag) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6190 for (size_t alignment = ag; is_size_aligned(size, alignment); alignment *= 2) { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6191 test_reserve_memory_special_shm(size, alignment); |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6192 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6193 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6194 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6195 |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
11092
diff
changeset
|
6196 static void test() { |
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6197 test_reserve_memory_special_huge_tlbfs(); |
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6198 test_reserve_memory_special_shm(); |
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6199 } |
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6200 }; |
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6201 |
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6202 void TestReserveMemorySpecial_test() { |
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6203 TestReserveMemorySpecial::test(); |
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6204 } |
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6205 |
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6206 #endif |