Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 12144:d8e99408faad
8009062: poor performance of JNI AttachCurrentThread after fix for 7017193
Summary: don't re-evaluate stack bounds for main thread before install guard page
Reviewed-by: coleenp, dholmes, dlong
| author | dsamersoff |
|---|---|
| date | Thu, 29 Aug 2013 21:48:23 +0400 |
| parents | 5e3b6f79d280 |
| children | c636758ea616 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/javaClasses.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/icBuffer.hpp" | |
| 31 #include "code/vtableStubs.hpp" | |
| 32 #include "gc_implementation/shared/vmGCOperations.hpp" | |
| 33 #include "interpreter/interpreter.hpp" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "oops/oop.inline.hpp" | |
| 36 #include "prims/jvm.h" | |
| 37 #include "prims/jvm_misc.hpp" | |
| 38 #include "prims/privilegedStack.hpp" | |
| 39 #include "runtime/arguments.hpp" | |
| 40 #include "runtime/frame.inline.hpp" | |
| 41 #include "runtime/interfaceSupport.hpp" | |
| 42 #include "runtime/java.hpp" | |
| 43 #include "runtime/javaCalls.hpp" | |
| 44 #include "runtime/mutexLocker.hpp" | |
| 45 #include "runtime/os.hpp" | |
| 46 #include "runtime/stubRoutines.hpp" | |
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47 #include "runtime/thread.inline.hpp" |
| 1972 | 48 #include "services/attachListener.hpp" |
| 6197 | 49 #include "services/memTracker.hpp" |
| 1972 | 50 #include "services/threadService.hpp" |
| 51 #include "utilities/defaultStream.hpp" | |
| 52 #include "utilities/events.hpp" | |
| 53 #ifdef TARGET_OS_FAMILY_linux | |
| 54 # include "os_linux.inline.hpp" | |
| 55 #endif | |
| 56 #ifdef TARGET_OS_FAMILY_solaris | |
| 57 # include "os_solaris.inline.hpp" | |
| 58 #endif | |
| 59 #ifdef TARGET_OS_FAMILY_windows | |
| 60 # include "os_windows.inline.hpp" | |
| 61 #endif | |
| 3960 | 62 #ifdef TARGET_OS_FAMILY_bsd |
| 63 # include "os_bsd.inline.hpp" | |
| 64 #endif | |
| 0 | 65 |
| 66 # include <signal.h> | |
| 67 | |
| 68 OSThread* os::_starting_thread = NULL; | |
| 69 address os::_polling_page = NULL; | |
| 70 volatile int32_t* os::_mem_serialize_page = NULL; | |
| 71 uintptr_t os::_serialize_page_mask = 0; | |
| 72 long os::_rand_seed = 1; | |
| 73 int os::_processor_count = 0; | |
| 74 size_t os::_page_sizes[os::page_sizes_max]; | |
| 75 | |
| 76 #ifndef PRODUCT | |
| 2250 | 77 julong os::num_mallocs = 0; // # of calls to malloc/realloc |
| 78 julong os::alloc_bytes = 0; // # of bytes allocated | |
| 79 julong os::num_frees = 0; // # of calls to free | |
| 80 julong os::free_bytes = 0; // # of bytes freed | |
| 0 | 81 #endif |
| 82 | |
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83 static juint cur_malloc_words = 0; // current size for MallocMaxTestWords |
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84 |
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85 void os_init_globals() { |
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86 // Called from init_globals(). |
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87 // See Threads::create_vm() in thread.cpp, and init.cpp. |
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88 os::init_globals(); |
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89 } |
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90 |
| 0 | 91 // Fill in buffer with current local time as an ISO-8601 string. |
| 92 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
| 93 // Returns buffer, or NULL if it failed. | |
| 94 // This would mostly be a call to | |
| 95 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
| 96 // except that on Windows the %z behaves badly, so we do it ourselves. | |
| 97 // Also, people wanted milliseconds on there, | |
| 98 // and strftime doesn't do milliseconds. | |
| 99 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
| 100 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
| 101 // 1 2 | |
| 102 // 12345678901234567890123456789 | |
| 103 static const char* iso8601_format = | |
| 104 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
| 105 static const size_t needed_buffer = 29; | |
| 106 | |
| 107 // Sanity check the arguments | |
| 108 if (buffer == NULL) { | |
| 109 assert(false, "NULL buffer"); | |
| 110 return NULL; | |
| 111 } | |
| 112 if (buffer_length < needed_buffer) { | |
| 113 assert(false, "buffer_length too small"); | |
| 114 return NULL; | |
| 115 } | |
| 116 // Get the current time | |
| 61 | 117 jlong milliseconds_since_19700101 = javaTimeMillis(); |
| 0 | 118 const int milliseconds_per_microsecond = 1000; |
| 119 const time_t seconds_since_19700101 = | |
| 120 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
| 121 const int milliseconds_after_second = | |
| 122 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
| 123 // Convert the time value to a tm and timezone variable | |
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124 struct tm time_struct; |
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125 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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126 assert(false, "Failed localtime_pd"); |
| 0 | 127 return NULL; |
| 128 } | |
| 3960 | 129 #if defined(_ALLBSD_SOURCE) |
| 130 const time_t zone = (time_t) time_struct.tm_gmtoff; | |
| 131 #else | |
| 0 | 132 const time_t zone = timezone; |
| 3960 | 133 #endif |
| 0 | 134 |
| 135 // If daylight savings time is in effect, | |
| 136 // we are 1 hour East of our time zone | |
| 137 const time_t seconds_per_minute = 60; | |
| 138 const time_t minutes_per_hour = 60; | |
| 139 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
| 140 time_t UTC_to_local = zone; | |
| 141 if (time_struct.tm_isdst > 0) { | |
| 142 UTC_to_local = UTC_to_local - seconds_per_hour; | |
| 143 } | |
| 144 // Compute the time zone offset. | |
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145 // localtime_pd() sets timezone to the difference (in seconds) |
| 0 | 146 // between UTC and and local time. |
| 147 // ISO 8601 says we need the difference between local time and UTC, | |
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148 // we change the sign of the localtime_pd() result. |
| 0 | 149 const time_t local_to_UTC = -(UTC_to_local); |
| 150 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
| 151 char sign_local_to_UTC = '+'; | |
| 152 time_t abs_local_to_UTC = local_to_UTC; | |
| 153 if (local_to_UTC < 0) { | |
| 154 sign_local_to_UTC = '-'; | |
| 155 abs_local_to_UTC = -(abs_local_to_UTC); | |
| 156 } | |
| 157 // Convert time zone offset seconds to hours and minutes. | |
| 158 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
| 159 const time_t zone_min = | |
| 160 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
| 161 | |
| 162 // Print an ISO 8601 date and time stamp into the buffer | |
| 163 const int year = 1900 + time_struct.tm_year; | |
| 164 const int month = 1 + time_struct.tm_mon; | |
| 165 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
| 166 year, | |
| 167 month, | |
| 168 time_struct.tm_mday, | |
| 169 time_struct.tm_hour, | |
| 170 time_struct.tm_min, | |
| 171 time_struct.tm_sec, | |
| 172 milliseconds_after_second, | |
| 173 sign_local_to_UTC, | |
| 174 zone_hours, | |
| 175 zone_min); | |
| 176 if (printed == 0) { | |
| 177 assert(false, "Failed jio_printf"); | |
| 178 return NULL; | |
| 179 } | |
| 180 return buffer; | |
| 181 } | |
| 182 | |
| 183 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
| 184 #ifdef ASSERT | |
| 185 if (!(!thread->is_Java_thread() || | |
| 186 Thread::current() == thread || | |
| 187 Threads_lock->owned_by_self() | |
| 188 || thread->is_Compiler_thread() | |
| 189 )) { | |
| 190 assert(false, "possibility of dangling Thread pointer"); | |
| 191 } | |
| 192 #endif | |
| 193 | |
| 194 if (p >= MinPriority && p <= MaxPriority) { | |
| 195 int priority = java_to_os_priority[p]; | |
| 196 return set_native_priority(thread, priority); | |
| 197 } else { | |
| 198 assert(false, "Should not happen"); | |
| 199 return OS_ERR; | |
| 200 } | |
| 201 } | |
| 202 | |
| 6766 | 203 // The mapping from OS priority back to Java priority may be inexact because |
| 204 // Java priorities can map M:1 with native priorities. If you want the definite | |
| 205 // Java priority then use JavaThread::java_priority() | |
| 0 | 206 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { |
| 207 int p; | |
| 208 int os_prio; | |
| 209 OSReturn ret = get_native_priority(thread, &os_prio); | |
| 210 if (ret != OS_OK) return ret; | |
| 211 | |
| 6766 | 212 if (java_to_os_priority[MaxPriority] > java_to_os_priority[MinPriority]) { |
| 213 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
| 214 } else { | |
| 215 // niceness values are in reverse order | |
| 216 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] < os_prio; p--) ; | |
| 217 } | |
| 0 | 218 priority = (ThreadPriority)p; |
| 219 return OS_OK; | |
| 220 } | |
| 221 | |
| 222 | |
| 223 // --------------------- sun.misc.Signal (optional) --------------------- | |
| 224 | |
| 225 | |
| 226 // SIGBREAK is sent by the keyboard to query the VM state | |
| 227 #ifndef SIGBREAK | |
| 228 #define SIGBREAK SIGQUIT | |
| 229 #endif | |
| 230 | |
| 231 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
| 232 | |
| 233 | |
| 234 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
| 235 os::set_priority(thread, NearMaxPriority); | |
| 236 while (true) { | |
| 237 int sig; | |
| 238 { | |
| 239 // FIXME : Currently we have not decieded what should be the status | |
| 240 // for this java thread blocked here. Once we decide about | |
| 241 // that we should fix this. | |
| 242 sig = os::signal_wait(); | |
| 243 } | |
| 244 if (sig == os::sigexitnum_pd()) { | |
| 245 // Terminate the signal thread | |
| 246 return; | |
| 247 } | |
| 248 | |
| 249 switch (sig) { | |
| 250 case SIGBREAK: { | |
| 251 // Check if the signal is a trigger to start the Attach Listener - in that | |
| 252 // case don't print stack traces. | |
| 253 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
| 254 continue; | |
| 255 } | |
| 256 // Print stack traces | |
| 257 // Any SIGBREAK operations added here should make sure to flush | |
| 258 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
| 259 // Each module also prints an extra carriage return after its output. | |
| 260 VM_PrintThreads op; | |
| 261 VMThread::execute(&op); | |
| 262 VM_PrintJNI jni_op; | |
| 263 VMThread::execute(&jni_op); | |
| 264 VM_FindDeadlocks op1(tty); | |
| 265 VMThread::execute(&op1); | |
| 266 Universe::print_heap_at_SIGBREAK(); | |
| 267 if (PrintClassHistogram) { | |
| 10405 | 268 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */); |
| 0 | 269 VMThread::execute(&op1); |
| 270 } | |
| 271 if (JvmtiExport::should_post_data_dump()) { | |
| 272 JvmtiExport::post_data_dump(); | |
| 273 } | |
| 274 break; | |
| 275 } | |
| 276 default: { | |
| 277 // Dispatch the signal to java | |
| 278 HandleMark hm(THREAD); | |
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279 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
| 0 | 280 KlassHandle klass (THREAD, k); |
| 281 if (klass.not_null()) { | |
| 282 JavaValue result(T_VOID); | |
| 283 JavaCallArguments args; | |
| 284 args.push_int(sig); | |
| 285 JavaCalls::call_static( | |
| 286 &result, | |
| 287 klass, | |
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288 vmSymbols::dispatch_name(), |
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289 vmSymbols::int_void_signature(), |
| 0 | 290 &args, |
| 291 THREAD | |
| 292 ); | |
| 293 } | |
| 294 if (HAS_PENDING_EXCEPTION) { | |
| 295 // tty is initialized early so we don't expect it to be null, but | |
| 296 // if it is we can't risk doing an initialization that might | |
| 297 // trigger additional out-of-memory conditions | |
| 298 if (tty != NULL) { | |
| 299 char klass_name[256]; | |
| 300 char tmp_sig_name[16]; | |
| 301 const char* sig_name = "UNKNOWN"; | |
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302 InstanceKlass::cast(PENDING_EXCEPTION->klass())-> |
| 0 | 303 name()->as_klass_external_name(klass_name, 256); |
| 304 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
| 305 sig_name = tmp_sig_name; | |
| 306 warning("Exception %s occurred dispatching signal %s to handler" | |
| 307 "- the VM may need to be forcibly terminated", | |
| 308 klass_name, sig_name ); | |
| 309 } | |
| 310 CLEAR_PENDING_EXCEPTION; | |
| 311 } | |
| 312 } | |
| 313 } | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 | |
| 318 void os::signal_init() { | |
| 319 if (!ReduceSignalUsage) { | |
| 320 // Setup JavaThread for processing signals | |
| 321 EXCEPTION_MARK; | |
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322 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 323 instanceKlassHandle klass (THREAD, k); |
| 324 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 325 | |
| 326 const char thread_name[] = "Signal Dispatcher"; | |
| 327 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
| 328 | |
| 329 // Initialize thread_oop to put it into the system threadGroup | |
| 330 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 331 JavaValue result(T_VOID); | |
| 332 JavaCalls::call_special(&result, thread_oop, | |
| 333 klass, | |
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334 vmSymbols::object_initializer_name(), |
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335 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 336 thread_group, |
| 337 string, | |
| 338 CHECK); | |
| 339 | |
| 1142 | 340 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 341 JavaCalls::call_special(&result, |
| 342 thread_group, | |
| 343 group, | |
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344 vmSymbols::add_method_name(), |
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345 vmSymbols::thread_void_signature(), |
| 0 | 346 thread_oop, // ARG 1 |
| 347 CHECK); | |
| 348 | |
| 349 os::signal_init_pd(); | |
| 350 | |
| 351 { MutexLocker mu(Threads_lock); | |
| 352 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
| 353 | |
| 354 // At this point it may be possible that no osthread was created for the | |
| 355 // JavaThread due to lack of memory. We would have to throw an exception | |
| 356 // in that case. However, since this must work and we do not allow | |
| 357 // exceptions anyway, check and abort if this fails. | |
| 358 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
| 359 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 360 "unable to create new native thread"); | |
| 361 } | |
| 362 | |
| 363 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
| 364 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 365 java_lang_Thread::set_daemon(thread_oop()); | |
| 366 | |
| 367 signal_thread->set_threadObj(thread_oop()); | |
| 368 Threads::add(signal_thread); | |
| 369 Thread::start(signal_thread); | |
| 370 } | |
| 371 // Handle ^BREAK | |
| 372 os::signal(SIGBREAK, os::user_handler()); | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 | |
| 377 void os::terminate_signal_thread() { | |
| 378 if (!ReduceSignalUsage) | |
| 379 signal_notify(sigexitnum_pd()); | |
| 380 } | |
| 381 | |
| 382 | |
| 383 // --------------------- loading libraries --------------------- | |
| 384 | |
| 385 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
| 386 extern struct JavaVM_ main_vm; | |
| 387 | |
| 388 static void* _native_java_library = NULL; | |
| 389 | |
| 390 void* os::native_java_library() { | |
| 391 if (_native_java_library == NULL) { | |
| 392 char buffer[JVM_MAXPATHLEN]; | |
| 393 char ebuf[1024]; | |
| 394 | |
| 242 | 395 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
| 396 // always able to find it when the loading executable is outside the JDK. | |
| 0 | 397 // In order to keep working with 1.2 we ignore any loading errors. |
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398 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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399 "verify")) { |
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400 dll_load(buffer, ebuf, sizeof(ebuf)); |
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401 } |
| 0 | 402 |
| 403 // Load java dll | |
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404 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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405 "java")) { |
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406 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); |
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407 } |
| 0 | 408 if (_native_java_library == NULL) { |
| 409 vm_exit_during_initialization("Unable to load native library", ebuf); | |
| 410 } | |
| 3960 | 411 |
| 412 #if defined(__OpenBSD__) | |
| 413 // Work-around OpenBSD's lack of $ORIGIN support by pre-loading libnet.so | |
| 414 // ignore errors | |
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415 if (dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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416 "net")) { |
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417 dll_load(buffer, ebuf, sizeof(ebuf)); |
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418 } |
| 3960 | 419 #endif |
| 242 | 420 } |
| 421 static jboolean onLoaded = JNI_FALSE; | |
| 422 if (onLoaded) { | |
| 423 // We may have to wait to fire OnLoad until TLS is initialized. | |
| 424 if (ThreadLocalStorage::is_initialized()) { | |
| 425 // The JNI_OnLoad handling is normally done by method load in | |
| 426 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
| 427 // explicitly so we have to check for JNI_OnLoad as well | |
| 428 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
| 429 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
| 430 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
| 431 if (JNI_OnLoad != NULL) { | |
| 432 JavaThread* thread = JavaThread::current(); | |
| 433 ThreadToNativeFromVM ttn(thread); | |
| 434 HandleMark hm(thread); | |
| 435 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
| 436 onLoaded = JNI_TRUE; | |
| 437 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
| 438 vm_exit_during_initialization("Unsupported JNI version"); | |
| 439 } | |
| 0 | 440 } |
| 441 } | |
| 442 } | |
| 443 return _native_java_library; | |
| 444 } | |
| 445 | |
| 446 // --------------------- heap allocation utilities --------------------- | |
| 447 | |
| 6197 | 448 char *os::strdup(const char *str, MEMFLAGS flags) { |
| 0 | 449 size_t size = strlen(str); |
| 6197 | 450 char *dup_str = (char *)malloc(size + 1, flags); |
| 0 | 451 if (dup_str == NULL) return NULL; |
| 452 strcpy(dup_str, str); | |
| 453 return dup_str; | |
| 454 } | |
| 455 | |
| 456 | |
| 457 | |
| 458 #ifdef ASSERT | |
| 459 #define space_before (MallocCushion + sizeof(double)) | |
| 460 #define space_after MallocCushion | |
| 461 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
| 462 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
| 463 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
| 464 // NB: cannot be debug variable, because these aren't set from the command line until | |
| 465 // *after* the first few allocs already happened | |
| 466 #define MallocCushion 16 | |
| 467 #else | |
| 468 #define space_before 0 | |
| 469 #define space_after 0 | |
| 470 #define size_addr_from_base(p) should not use w/o ASSERT | |
| 471 #define size_addr_from_obj(p) should not use w/o ASSERT | |
| 472 #define MallocCushion 0 | |
| 473 #endif | |
| 474 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
| 475 | |
| 476 #ifdef ASSERT | |
| 477 inline size_t get_size(void* obj) { | |
| 478 size_t size = *size_addr_from_obj(obj); | |
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479 if (size < 0) { |
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480 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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481 SIZE_FORMAT ")", obj, size)); |
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482 } |
| 0 | 483 return size; |
| 484 } | |
| 485 | |
| 486 u_char* find_cushion_backwards(u_char* start) { | |
| 487 u_char* p = start; | |
| 488 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
| 489 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
| 490 // ok, we have four consecutive marker bytes; find start | |
| 491 u_char* q = p - 4; | |
| 492 while (*q == badResourceValue) q--; | |
| 493 return q + 1; | |
| 494 } | |
| 495 | |
| 496 u_char* find_cushion_forwards(u_char* start) { | |
| 497 u_char* p = start; | |
| 498 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
| 499 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
| 500 // ok, we have four consecutive marker bytes; find end of cushion | |
| 501 u_char* q = p + 4; | |
| 502 while (*q == badResourceValue) q++; | |
| 503 return q - MallocCushion; | |
| 504 } | |
| 505 | |
| 506 void print_neighbor_blocks(void* ptr) { | |
| 507 // find block allocated before ptr (not entirely crash-proof) | |
| 508 if (MallocCushion < 4) { | |
| 509 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
| 510 return; | |
| 511 } | |
| 512 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
| 513 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
| 514 // look for cushion in front of prev. block | |
| 515 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
| 516 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
| 517 u_char* obj = start_of_prev_block + space_before; | |
| 518 if (size <= 0 ) { | |
| 519 // start is bad; mayhave been confused by OS data inbetween objects | |
| 520 // search one more backwards | |
| 521 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
| 522 size = *size_addr_from_base(start_of_prev_block); | |
| 523 obj = start_of_prev_block + space_before; | |
| 524 } | |
| 525 | |
| 526 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
| 2250 | 527 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
| 0 | 528 } else { |
| 2250 | 529 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
| 0 | 530 } |
| 531 | |
| 532 // now find successor block | |
| 533 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
| 534 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
| 535 u_char* next_obj = start_of_next_block + space_before; | |
| 536 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
| 537 if (start_of_next_block[0] == badResourceValue && | |
| 538 start_of_next_block[1] == badResourceValue && | |
| 539 start_of_next_block[2] == badResourceValue && | |
| 540 start_of_next_block[3] == badResourceValue) { | |
| 2250 | 541 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
| 0 | 542 } else { |
| 2250 | 543 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
| 0 | 544 } |
| 545 } | |
| 546 | |
| 547 | |
| 548 void report_heap_error(void* memblock, void* bad, const char* where) { | |
| 2250 | 549 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
| 550 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
| 0 | 551 print_neighbor_blocks(memblock); |
| 552 fatal("memory stomping error"); | |
| 553 } | |
| 554 | |
| 555 void verify_block(void* memblock) { | |
| 556 size_t size = get_size(memblock); | |
| 557 if (MallocCushion) { | |
| 558 u_char* ptr = (u_char*)memblock - space_before; | |
| 559 for (int i = 0; i < MallocCushion; i++) { | |
| 560 if (ptr[i] != badResourceValue) { | |
| 561 report_heap_error(memblock, ptr+i, "in front of"); | |
| 562 } | |
| 563 } | |
| 564 u_char* end = (u_char*)memblock + size + space_after; | |
| 565 for (int j = -MallocCushion; j < 0; j++) { | |
| 566 if (end[j] != badResourceValue) { | |
| 567 report_heap_error(memblock, end+j, "after"); | |
| 568 } | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 #endif | |
| 573 | |
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574 // |
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575 // This function supports testing of the malloc out of memory |
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576 // condition without really running the system out of memory. |
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577 // |
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578 static u_char* testMalloc(size_t alloc_size) { |
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579 assert(MallocMaxTestWords > 0, "sanity check"); |
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580 |
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581 if ((cur_malloc_words + (alloc_size / BytesPerWord)) > MallocMaxTestWords) { |
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582 return NULL; |
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583 } |
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584 |
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585 u_char* ptr = (u_char*)::malloc(alloc_size); |
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586 |
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587 if (ptr != NULL) { |
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588 Atomic::add(((jint) (alloc_size / BytesPerWord)), |
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589 (volatile jint *) &cur_malloc_words); |
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590 } |
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591 return ptr; |
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592 } |
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593 |
| 6197 | 594 void* os::malloc(size_t size, MEMFLAGS memflags, address caller) { |
| 2250 | 595 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
| 596 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
| 0 | 597 |
| 11151 | 598 #ifdef ASSERT |
| 599 // checking for the WatcherThread and crash_protection first | |
| 600 // since os::malloc can be called when the libjvm.{dll,so} is | |
| 601 // first loaded and we don't have a thread yet. | |
| 602 // try to find the thread after we see that the watcher thread | |
| 603 // exists and has crash protection. | |
| 604 WatcherThread *wt = WatcherThread::watcher_thread(); | |
| 605 if (wt != NULL && wt->has_crash_protection()) { | |
| 606 Thread* thread = ThreadLocalStorage::get_thread_slow(); | |
| 607 if (thread == wt) { | |
| 608 assert(!wt->has_crash_protection(), | |
| 609 "Can't malloc with crash protection from WatcherThread"); | |
| 610 } | |
| 611 } | |
| 612 #endif | |
| 613 | |
| 0 | 614 if (size == 0) { |
| 615 // return a valid pointer if size is zero | |
| 616 // if NULL is returned the calling functions assume out of memory. | |
| 617 size = 1; | |
| 618 } | |
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619 |
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620 const size_t alloc_size = size + space_before + space_after; |
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621 |
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622 if (size > alloc_size) { // Check for rollover. |
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623 return NULL; |
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624 } |
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625 |
| 0 | 626 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); |
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627 |
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628 u_char* ptr; |
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629 |
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630 if (MallocMaxTestWords > 0) { |
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631 ptr = testMalloc(alloc_size); |
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632 } else { |
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633 ptr = (u_char*)::malloc(alloc_size); |
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634 } |
| 6197 | 635 |
| 0 | 636 #ifdef ASSERT |
| 637 if (ptr == NULL) return NULL; | |
| 638 if (MallocCushion) { | |
| 639 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
| 640 u_char* end = ptr + space_before + size; | |
| 641 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
| 642 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
| 643 } | |
| 644 // put size just before data | |
| 645 *size_addr_from_base(ptr) = size; | |
| 646 #endif | |
| 647 u_char* memblock = ptr + space_before; | |
| 648 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 649 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
| 0 | 650 breakpoint(); |
| 651 } | |
| 652 debug_only(if (paranoid) verify_block(memblock)); | |
| 2250 | 653 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
| 6197 | 654 |
| 655 // we do not track MallocCushion memory | |
| 656 MemTracker::record_malloc((address)memblock, size, memflags, caller == 0 ? CALLER_PC : caller); | |
| 657 | |
| 0 | 658 return memblock; |
| 659 } | |
| 660 | |
| 661 | |
| 6197 | 662 void* os::realloc(void *memblock, size_t size, MEMFLAGS memflags, address caller) { |
| 0 | 663 #ifndef ASSERT |
| 2250 | 664 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
| 665 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
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666 MemTracker::Tracker tkr = MemTracker::get_realloc_tracker(); |
| 6197 | 667 void* ptr = ::realloc(memblock, size); |
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668 if (ptr != NULL) { |
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669 tkr.record((address)memblock, (address)ptr, size, memflags, |
| 6197 | 670 caller == 0 ? CALLER_PC : caller); |
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671 } else { |
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672 tkr.discard(); |
| 6197 | 673 } |
| 674 return ptr; | |
| 0 | 675 #else |
| 676 if (memblock == NULL) { | |
| 6197 | 677 return malloc(size, memflags, (caller == 0 ? CALLER_PC : caller)); |
| 0 | 678 } |
| 679 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 680 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
| 0 | 681 breakpoint(); |
| 682 } | |
| 683 verify_block(memblock); | |
| 684 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 685 if (size == 0) return NULL; | |
| 686 // always move the block | |
| 6197 | 687 void* ptr = malloc(size, memflags, caller == 0 ? CALLER_PC : caller); |
| 2250 | 688 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
| 0 | 689 // Copy to new memory if malloc didn't fail |
| 690 if ( ptr != NULL ) { | |
| 691 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
| 692 if (paranoid) verify_block(ptr); | |
| 693 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
| 2250 | 694 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
| 0 | 695 breakpoint(); |
| 696 } | |
| 697 free(memblock); | |
| 698 } | |
| 699 return ptr; | |
| 700 #endif | |
| 701 } | |
| 702 | |
| 703 | |
| 6197 | 704 void os::free(void *memblock, MEMFLAGS memflags) { |
| 2250 | 705 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
| 0 | 706 #ifdef ASSERT |
| 707 if (memblock == NULL) return; | |
| 708 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 709 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
| 0 | 710 breakpoint(); |
| 711 } | |
| 712 verify_block(memblock); | |
| 713 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 714 // Added by detlefs. | |
| 715 if (MallocCushion) { | |
| 716 u_char* ptr = (u_char*)memblock - space_before; | |
| 717 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
| 718 guarantee(*p == badResourceValue, | |
| 719 "Thing freed should be malloc result."); | |
| 720 *p = (u_char)freeBlockPad; | |
| 721 } | |
| 722 size_t size = get_size(memblock); | |
| 2250 | 723 inc_stat_counter(&free_bytes, size); |
| 0 | 724 u_char* end = ptr + space_before + size; |
| 725 for (u_char* q = end; q < end + MallocCushion; q++) { | |
| 726 guarantee(*q == badResourceValue, | |
| 727 "Thing freed should be malloc result."); | |
| 728 *q = (u_char)freeBlockPad; | |
| 729 } | |
| 2250 | 730 if (PrintMalloc && tty != NULL) |
|
2333
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|
731 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
| 2250 | 732 } else if (PrintMalloc && tty != NULL) { |
| 733 // tty->print_cr("os::free %p", memblock); | |
|
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|
734 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
| 0 | 735 } |
| 736 #endif | |
| 6197 | 737 MemTracker::record_free((address)memblock, memflags); |
| 738 | |
| 0 | 739 ::free((char*)memblock - space_before); |
| 740 } | |
| 741 | |
| 742 void os::init_random(long initval) { | |
| 743 _rand_seed = initval; | |
| 744 } | |
| 745 | |
| 746 | |
| 747 long os::random() { | |
| 748 /* standard, well-known linear congruential random generator with | |
| 749 * next_rand = (16807*seed) mod (2**31-1) | |
| 750 * see | |
| 751 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
| 752 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
| 753 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
| 754 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
| 755 */ | |
| 756 const long a = 16807; | |
| 757 const unsigned long m = 2147483647; | |
| 758 const long q = m / a; assert(q == 127773, "weird math"); | |
| 759 const long r = m % a; assert(r == 2836, "weird math"); | |
| 760 | |
| 761 // compute az=2^31p+q | |
| 762 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
| 763 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
| 764 lo += (hi & 0x7FFF) << 16; | |
| 765 | |
| 766 // if q overflowed, ignore the overflow and increment q | |
| 767 if (lo > m) { | |
| 768 lo &= m; | |
| 769 ++lo; | |
| 770 } | |
| 771 lo += hi >> 15; | |
| 772 | |
| 773 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
| 774 if (lo > m) { | |
| 775 lo &= m; | |
| 776 ++lo; | |
| 777 } | |
| 778 return (_rand_seed = lo); | |
| 779 } | |
| 780 | |
| 781 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
| 782 // conditions in which a thread is first started are different from those in which | |
| 783 // a suspension is resumed. These differences make it hard for us to apply the | |
| 784 // tougher checks when starting threads that we want to do when resuming them. | |
| 785 // However, when start_thread is called as a result of Thread.start, on a Java | |
| 786 // thread, the operation is synchronized on the Java Thread object. So there | |
| 787 // cannot be a race to start the thread and hence for the thread to exit while | |
| 788 // we are working on it. Non-Java threads that start Java threads either have | |
| 789 // to do so in a context in which races are impossible, or should do appropriate | |
| 790 // locking. | |
| 791 | |
| 792 void os::start_thread(Thread* thread) { | |
| 793 // guard suspend/resume | |
| 794 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 795 OSThread* osthread = thread->osthread(); | |
| 796 osthread->set_state(RUNNABLE); | |
| 797 pd_start_thread(thread); | |
| 798 } | |
| 799 | |
| 800 //--------------------------------------------------------------------------- | |
| 801 // Helper functions for fatal error handler | |
| 802 | |
| 803 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
| 804 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
| 805 | |
| 806 int cols = 0; | |
| 807 int cols_per_line = 0; | |
| 808 switch (unitsize) { | |
| 809 case 1: cols_per_line = 16; break; | |
| 810 case 2: cols_per_line = 8; break; | |
| 811 case 4: cols_per_line = 4; break; | |
| 812 case 8: cols_per_line = 2; break; | |
| 813 default: return; | |
| 814 } | |
| 815 | |
| 816 address p = start; | |
| 817 st->print(PTR_FORMAT ": ", start); | |
| 818 while (p < end) { | |
| 819 switch (unitsize) { | |
| 820 case 1: st->print("%02x", *(u1*)p); break; | |
| 821 case 2: st->print("%04x", *(u2*)p); break; | |
| 822 case 4: st->print("%08x", *(u4*)p); break; | |
| 823 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
| 824 } | |
| 825 p += unitsize; | |
| 826 cols++; | |
| 827 if (cols >= cols_per_line && p < end) { | |
| 828 cols = 0; | |
| 829 st->cr(); | |
| 830 st->print(PTR_FORMAT ": ", p); | |
| 831 } else { | |
| 832 st->print(" "); | |
| 833 } | |
| 834 } | |
| 835 st->cr(); | |
| 836 } | |
| 837 | |
| 838 void os::print_environment_variables(outputStream* st, const char** env_list, | |
| 839 char* buffer, int len) { | |
| 840 if (env_list) { | |
| 841 st->print_cr("Environment Variables:"); | |
| 842 | |
| 843 for (int i = 0; env_list[i] != NULL; i++) { | |
| 844 if (getenv(env_list[i], buffer, len)) { | |
| 845 st->print(env_list[i]); | |
| 846 st->print("="); | |
| 847 st->print_cr(buffer); | |
| 848 } | |
| 849 } | |
| 850 } | |
| 851 } | |
| 852 | |
| 853 void os::print_cpu_info(outputStream* st) { | |
| 854 // cpu | |
| 855 st->print("CPU:"); | |
| 856 st->print("total %d", os::processor_count()); | |
| 857 // It's not safe to query number of active processors after crash | |
| 858 // st->print("(active %d)", os::active_processor_count()); | |
| 859 st->print(" %s", VM_Version::cpu_features()); | |
| 860 st->cr(); | |
|
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|
861 pd_print_cpu_info(st); |
| 0 | 862 } |
| 863 | |
| 864 void os::print_date_and_time(outputStream *st) { | |
| 865 time_t tloc; | |
| 866 (void)time(&tloc); | |
| 867 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
| 868 | |
| 869 double t = os::elapsedTime(); | |
| 870 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
| 871 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
| 872 // before printf. We lost some precision, but who cares? | |
| 873 st->print_cr("elapsed time: %d seconds", (int)t); | |
| 874 } | |
| 875 | |
|
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|
876 // moved from debug.cpp (used to be find()) but still called from there |
| 1907 | 877 // The verbose parameter is only set by the debug code in one case |
| 878 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
|
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|
879 address addr = (address)x; |
|
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|
880 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
|
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|
881 if (b != NULL) { |
|
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|
882 if (b->is_buffer_blob()) { |
|
126ea7725993
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|
883 // the interpreter is generated into a buffer blob |
|
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|
884 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
|
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|
885 if (i != NULL) { |
|
6266
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|
886 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", addr, (int)(addr - i->code_begin())); |
|
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|
887 i->print_on(st); |
|
126ea7725993
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|
888 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
889 } |
|
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|
890 if (Interpreter::contains(addr)) { |
|
126ea7725993
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|
891 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
|
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|
892 " (not bytecode specific)", addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
893 return; |
|
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6953477: Increase portability and flexibility of building Hotspot
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parents:
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|
894 } |
|
126ea7725993
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changeset
|
895 // |
|
126ea7725993
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|
896 if (AdapterHandlerLibrary::contains(b)) { |
|
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changeset
|
897 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", addr, (int)(addr - b->code_begin())); |
|
1681
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|
898 AdapterHandlerLibrary::print_handler_on(st, b); |
|
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|
899 } |
|
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|
900 // the stubroutines are generated into a buffer blob |
|
126ea7725993
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changeset
|
901 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
|
126ea7725993
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|
902 if (d != NULL) { |
|
6266
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7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
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diff
changeset
|
903 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", addr, (int)(addr - d->begin())); |
|
1681
126ea7725993
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changeset
|
904 d->print_on(st); |
|
6266
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7023639: JSR 292 method handle invocation needs a fast path for compiled code
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diff
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|
905 st->cr(); |
|
1681
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6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
906 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
907 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
908 if (StubRoutines::contains(addr)) { |
|
126ea7725993
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|
909 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
|
126ea7725993
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|
910 "stub routine", addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
911 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
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|
912 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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changeset
|
913 // the InlineCacheBuffer is using stubs generated into a buffer blob |
|
126ea7725993
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diff
changeset
|
914 if (InlineCacheBuffer::contains(addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
915 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
916 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
917 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
918 VtableStub* v = VtableStubs::stub_containing(addr); |
|
126ea7725993
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parents:
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|
919 if (v != NULL) { |
|
6266
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7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
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diff
changeset
|
920 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", addr, (int)(addr - v->entry_point())); |
|
1681
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|
921 v->print_on(st); |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
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diff
changeset
|
922 st->cr(); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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changeset
|
923 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
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|
924 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
925 } |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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parents:
6197
diff
changeset
|
926 nmethod* nm = b->as_nmethod_or_null(); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
927 if (nm != NULL) { |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
928 ResourceMark rm; |
|
6266
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7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
929 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT, |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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changeset
|
930 addr, (int)(addr - nm->entry_point()), nm); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
931 if (verbose) { |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
932 st->print(" for "); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
6197
diff
changeset
|
933 nm->method()->print_value_on(st); |
|
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
parents:
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diff
changeset
|
934 } |
|
6816
87ac5c0a404d
8000228: Missing call to cr() when printing entry_point in nmethod, in os::print_location
stefank
parents:
6814
diff
changeset
|
935 st->cr(); |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
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diff
changeset
|
936 nm->print_nmethod(verbose); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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changeset
|
937 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
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|
938 } |
|
6266
1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
twisti
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changeset
|
939 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", addr, (int)(addr - b->code_begin())); |
|
1681
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parents:
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changeset
|
940 b->print_on(st); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
941 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
942 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
1642
diff
changeset
|
943 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
944 if (Universe::heap()->is_in(addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
945 HeapWord* p = Universe::heap()->block_start(addr); |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
946 bool print = false; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
947 // If we couldn't find it it just may mean that heap wasn't parseable |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
948 // See if we were just given an oop directly |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
949 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
950 print = true; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
951 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1642
diff
changeset
|
952 p = (HeapWord*) addr; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
953 print = true; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
954 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
955 if (print) { |
|
6814
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
parents:
6766
diff
changeset
|
956 if (p == (HeapWord*) addr) { |
|
85f1cded9793
8000230: Change os::print_location to be more descriptive when a location is pointing into an object
stefank
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|
957 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
|
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958 } else { |
|
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|
959 st->print_cr(INTPTR_FORMAT " is pointing into object: " INTPTR_FORMAT, addr, p); |
|
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|
960 } |
|
1681
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|
961 oop(p)->print_on(st); |
|
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|
962 return; |
|
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|
963 } |
|
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|
964 } else { |
|
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|
965 if (Universe::heap()->is_in_reserved(addr)) { |
|
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|
966 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
|
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|
967 "in the heap", addr); |
|
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|
968 return; |
|
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|
969 } |
|
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|
970 } |
|
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|
971 if (JNIHandles::is_global_handle((jobject) addr)) { |
|
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|
972 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
|
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973 return; |
|
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|
974 } |
|
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|
975 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
|
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|
976 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
|
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|
977 return; |
|
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|
978 } |
|
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|
979 #ifndef PRODUCT |
|
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980 // we don't keep the block list in product mode |
|
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981 if (JNIHandleBlock::any_contains((jobject) addr)) { |
|
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|
982 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
|
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|
983 return; |
|
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|
984 } |
|
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|
985 #endif |
|
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|
986 |
|
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987 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
|
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|
988 // Check for privilege stack |
|
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|
989 if (thread->privileged_stack_top() != NULL && |
|
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990 thread->privileged_stack_top()->contains(addr)) { |
|
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991 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
|
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|
992 "for thread: " INTPTR_FORMAT, addr, thread); |
| 1907 | 993 if (verbose) thread->print_on(st); |
|
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|
994 return; |
|
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|
995 } |
|
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|
996 // If the addr is a java thread print information about that. |
|
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|
997 if (addr == (address)thread) { |
| 1907 | 998 if (verbose) { |
| 999 thread->print_on(st); | |
| 1000 } else { | |
| 1001 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
| 1002 } | |
|
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|
1003 return; |
|
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|
1004 } |
|
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|
1005 // If the addr is in the stack region for this thread then report that |
|
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|
1006 // and print thread info |
|
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1007 if (thread->stack_base() >= addr && |
|
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|
1008 addr > (thread->stack_base() - thread->stack_size())) { |
|
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|
1009 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
|
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|
1010 INTPTR_FORMAT, addr, thread); |
| 1907 | 1011 if (verbose) thread->print_on(st); |
|
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1012 return; |
|
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1013 } |
|
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|
1014 |
|
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1015 } |
|
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1016 |
|
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1017 #ifndef PRODUCT |
|
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|
1018 // Check if in metaspace. |
|
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1019 if (ClassLoaderDataGraph::contains((address)addr)) { |
|
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1020 // Use addr->print() from the debugger instead (not here) |
|
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1021 st->print_cr(INTPTR_FORMAT |
|
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1022 " is pointing into metadata", addr); |
|
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|
1023 return; |
|
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|
1024 } |
|
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|
1025 #endif |
|
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|
1026 |
|
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|
1027 // Try an OS specific find |
|
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|
1028 if (os::find(addr, st)) { |
|
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|
1029 return; |
|
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|
1030 } |
|
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|
1031 |
| 1907 | 1032 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
|
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|
1033 } |
| 0 | 1034 |
| 1035 // Looks like all platforms except IA64 can use the same function to check | |
| 1036 // if C stack is walkable beyond current frame. The check for fp() is not | |
| 1037 // necessary on Sparc, but it's harmless. | |
| 1038 bool os::is_first_C_frame(frame* fr) { | |
| 7994 | 1039 #if defined(IA64) && !defined(_WIN32) |
| 1040 // On IA64 we have to check if the callers bsp is still valid | |
| 1041 // (i.e. within the register stack bounds). | |
| 1042 // Notice: this only works for threads created by the VM and only if | |
| 1043 // we walk the current stack!!! If we want to be able to walk | |
| 1044 // arbitrary other threads, we'll have to somehow store the thread | |
| 1045 // object in the frame. | |
| 1046 Thread *thread = Thread::current(); | |
| 1047 if ((address)fr->fp() <= | |
| 1048 thread->register_stack_base() HPUX_ONLY(+ 0x0) LINUX_ONLY(+ 0x50)) { | |
| 1049 // This check is a little hacky, because on Linux the first C | |
| 1050 // frame's ('start_thread') register stack frame starts at | |
| 1051 // "register_stack_base + 0x48" while on HPUX, the first C frame's | |
| 1052 // ('__pthread_bound_body') register stack frame seems to really | |
| 1053 // start at "register_stack_base". | |
| 1054 return true; | |
| 1055 } else { | |
| 1056 return false; | |
| 1057 } | |
| 1058 #elif defined(IA64) && defined(_WIN32) | |
| 0 | 1059 return true; |
| 7994 | 1060 #else |
| 0 | 1061 // Load up sp, fp, sender sp and sender fp, check for reasonable values. |
| 1062 // Check usp first, because if that's bad the other accessors may fault | |
| 1063 // on some architectures. Ditto ufp second, etc. | |
| 1064 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
| 1065 // sp on amd can be 32 bit aligned. | |
| 1066 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
| 1067 | |
| 1068 uintptr_t usp = (uintptr_t)fr->sp(); | |
| 1069 if ((usp & sp_align_mask) != 0) return true; | |
| 1070 | |
| 1071 uintptr_t ufp = (uintptr_t)fr->fp(); | |
| 1072 if ((ufp & fp_align_mask) != 0) return true; | |
| 1073 | |
| 1074 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
| 1075 if ((old_sp & sp_align_mask) != 0) return true; | |
| 1076 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
| 1077 | |
| 1078 uintptr_t old_fp = (uintptr_t)fr->link(); | |
| 1079 if ((old_fp & fp_align_mask) != 0) return true; | |
| 1080 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
| 1081 | |
| 1082 // stack grows downwards; if old_fp is below current fp or if the stack | |
| 1083 // frame is too large, either the stack is corrupted or fp is not saved | |
| 1084 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
| 1085 // is not walkable beyond current frame. | |
| 1086 if (old_fp < ufp) return true; | |
| 1087 if (old_fp - ufp > 64 * K) return true; | |
| 1088 | |
| 1089 return false; | |
| 7994 | 1090 #endif |
| 0 | 1091 } |
| 1092 | |
| 1093 #ifdef ASSERT | |
| 1094 extern "C" void test_random() { | |
| 1095 const double m = 2147483647; | |
| 1096 double mean = 0.0, variance = 0.0, t; | |
| 1097 long reps = 10000; | |
| 1098 unsigned long seed = 1; | |
| 1099 | |
| 1100 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
| 1101 os::init_random(seed); | |
| 1102 long num; | |
| 1103 for (int k = 0; k < reps; k++) { | |
| 1104 num = os::random(); | |
| 1105 double u = (double)num / m; | |
| 1106 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
| 1107 | |
| 1108 // calculate mean and variance of the random sequence | |
| 1109 mean += u; | |
| 1110 variance += (u*u); | |
| 1111 } | |
| 1112 mean /= reps; | |
| 1113 variance /= (reps - 1); | |
| 1114 | |
| 1115 assert(num == 1043618065, "bad seed"); | |
| 1116 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
| 1117 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
| 1118 const double eps = 0.0001; | |
| 1119 t = fabsd(mean - 0.5018); | |
| 1120 assert(t < eps, "bad mean"); | |
| 1121 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
| 1122 assert(t < eps, "bad variance"); | |
| 1123 } | |
| 1124 #endif | |
| 1125 | |
| 1126 | |
| 1127 // Set up the boot classpath. | |
| 1128 | |
| 1129 char* os::format_boot_path(const char* format_string, | |
| 1130 const char* home, | |
| 1131 int home_len, | |
| 1132 char fileSep, | |
| 1133 char pathSep) { | |
| 1134 assert((fileSep == '/' && pathSep == ':') || | |
| 1135 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
| 1136 | |
| 1137 // Scan the format string to determine the length of the actual | |
| 1138 // boot classpath, and handle platform dependencies as well. | |
| 1139 int formatted_path_len = 0; | |
| 1140 const char* p; | |
| 1141 for (p = format_string; *p != 0; ++p) { | |
| 1142 if (*p == '%') formatted_path_len += home_len - 1; | |
| 1143 ++formatted_path_len; | |
| 1144 } | |
| 1145 | |
| 6197 | 1146 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1, mtInternal); |
| 0 | 1147 if (formatted_path == NULL) { |
| 1148 return NULL; | |
| 1149 } | |
| 1150 | |
| 1151 // Create boot classpath from format, substituting separator chars and | |
| 1152 // java home directory. | |
| 1153 char* q = formatted_path; | |
| 1154 for (p = format_string; *p != 0; ++p) { | |
| 1155 switch (*p) { | |
| 1156 case '%': | |
| 1157 strcpy(q, home); | |
| 1158 q += home_len; | |
| 1159 break; | |
| 1160 case '/': | |
| 1161 *q++ = fileSep; | |
| 1162 break; | |
| 1163 case ':': | |
| 1164 *q++ = pathSep; | |
| 1165 break; | |
| 1166 default: | |
| 1167 *q++ = *p; | |
| 1168 } | |
| 1169 } | |
| 1170 *q = '\0'; | |
| 1171 | |
| 1172 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
| 1173 return formatted_path; | |
| 1174 } | |
| 1175 | |
| 1176 | |
| 1177 bool os::set_boot_path(char fileSep, char pathSep) { | |
| 1178 const char* home = Arguments::get_java_home(); | |
| 1179 int home_len = (int)strlen(home); | |
| 1180 | |
| 1181 static const char* meta_index_dir_format = "%/lib/"; | |
| 1182 static const char* meta_index_format = "%/lib/meta-index"; | |
| 1183 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
| 1184 if (meta_index == NULL) return false; | |
| 1185 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
| 1186 if (meta_index_dir == NULL) return false; | |
| 1187 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
| 1188 | |
| 1189 // Any modification to the JAR-file list, for the boot classpath must be | |
| 1190 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
| 1191 // path class JARs, are stripped for StackMapTable to reduce download size. | |
| 1192 static const char classpath_format[] = | |
| 1193 "%/lib/resources.jar:" | |
| 1194 "%/lib/rt.jar:" | |
| 1195 "%/lib/sunrsasign.jar:" | |
| 1196 "%/lib/jsse.jar:" | |
| 1197 "%/lib/jce.jar:" | |
| 1198 "%/lib/charsets.jar:" | |
|
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1199 "%/lib/jfr.jar:" |
| 4006 | 1200 #ifdef __APPLE__ |
| 1201 "%/lib/JObjC.jar:" | |
| 1202 #endif | |
| 0 | 1203 "%/classes"; |
| 1204 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
| 1205 if (sysclasspath == NULL) return false; | |
| 1206 Arguments::set_sysclasspath(sysclasspath); | |
| 1207 | |
| 1208 return true; | |
| 1209 } | |
| 1210 | |
| 691 | 1211 /* |
| 1212 * Splits a path, based on its separator, the number of | |
| 1213 * elements is returned back in n. | |
| 1214 * It is the callers responsibility to: | |
| 1215 * a> check the value of n, and n may be 0. | |
| 1216 * b> ignore any empty path elements | |
| 1217 * c> free up the data. | |
| 1218 */ | |
| 1219 char** os::split_path(const char* path, int* n) { | |
| 1220 *n = 0; | |
| 1221 if (path == NULL || strlen(path) == 0) { | |
| 1222 return NULL; | |
| 1223 } | |
| 1224 const char psepchar = *os::path_separator(); | |
| 6197 | 1225 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1, mtInternal); |
| 691 | 1226 if (inpath == NULL) { |
| 1227 return NULL; | |
| 1228 } | |
|
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|
1229 strcpy(inpath, path); |
| 691 | 1230 int count = 1; |
| 1231 char* p = strchr(inpath, psepchar); | |
| 1232 // Get a count of elements to allocate memory | |
| 1233 while (p != NULL) { | |
| 1234 count++; | |
| 1235 p++; | |
| 1236 p = strchr(p, psepchar); | |
| 1237 } | |
| 6197 | 1238 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count, mtInternal); |
| 691 | 1239 if (opath == NULL) { |
| 1240 return NULL; | |
| 1241 } | |
| 1242 | |
| 1243 // do the actual splitting | |
| 1244 p = inpath; | |
| 1245 for (int i = 0 ; i < count ; i++) { | |
| 1246 size_t len = strcspn(p, os::path_separator()); | |
| 1247 if (len > JVM_MAXPATHLEN) { | |
| 1248 return NULL; | |
| 1249 } | |
| 1250 // allocate the string and add terminator storage | |
| 6197 | 1251 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); |
| 691 | 1252 if (s == NULL) { |
| 1253 return NULL; | |
| 1254 } | |
| 1255 strncpy(s, p, len); | |
| 1256 s[len] = '\0'; | |
| 1257 opath[i] = s; | |
| 1258 p += len + 1; | |
| 1259 } | |
| 6197 | 1260 FREE_C_HEAP_ARRAY(char, inpath, mtInternal); |
| 691 | 1261 *n = count; |
| 1262 return opath; | |
| 1263 } | |
| 1264 | |
| 0 | 1265 void os::set_memory_serialize_page(address page) { |
| 1266 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
| 1267 _mem_serialize_page = (volatile int32_t *)page; | |
| 1268 // We initialize the serialization page shift count here | |
| 1269 // We assume a cache line size of 64 bytes | |
| 1270 assert(SerializePageShiftCount == count, | |
| 1271 "thread size changed, fix SerializePageShiftCount constant"); | |
| 1272 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
| 1273 } | |
| 1274 | |
|
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1275 static volatile intptr_t SerializePageLock = 0; |
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1276 |
| 0 | 1277 // This method is called from signal handler when SIGSEGV occurs while the current |
| 1278 // thread tries to store to the "read-only" memory serialize page during state | |
| 1279 // transition. | |
| 1280 void os::block_on_serialize_page_trap() { | |
| 1281 if (TraceSafepoint) { | |
| 1282 tty->print_cr("Block until the serialize page permission restored"); | |
| 1283 } | |
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1284 // When VMThread is holding the SerializePageLock during modifying the |
| 0 | 1285 // access permission of the memory serialize page, the following call |
| 1286 // will block until the permission of that page is restored to rw. | |
| 1287 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
| 1288 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1289 // it can occur. |
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1290 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1291 Thread::muxRelease(&SerializePageLock); |
| 0 | 1292 } |
| 1293 | |
| 1294 // Serialize all thread state variables | |
| 1295 void os::serialize_thread_states() { | |
| 1296 // On some platforms such as Solaris & Linux, the time duration of the page | |
| 1297 // permission restoration is observed to be much longer than expected due to | |
| 1298 // scheduler starvation problem etc. To avoid the long synchronization | |
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1299 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1300 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1301 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1302 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1303 os::vm_page_size(), MEM_PROT_READ); |
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1304 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1305 os::vm_page_size(), MEM_PROT_RW); |
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1306 Thread::muxRelease(&SerializePageLock); |
| 0 | 1307 } |
| 1308 | |
| 1309 // Returns true if the current stack pointer is above the stack shadow | |
| 1310 // pages, false otherwise. | |
| 1311 | |
| 1312 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
| 1313 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
| 1314 address sp = current_stack_pointer(); | |
| 1315 // Check if we have StackShadowPages above the yellow zone. This parameter | |
| 605 | 1316 // is dependent on the depth of the maximum VM call stack possible from |
| 0 | 1317 // the handler for stack overflow. 'instanceof' in the stack overflow |
| 1318 // handler or a println uses at least 8k stack of VM and native code | |
| 1319 // respectively. | |
| 1320 const int framesize_in_bytes = | |
| 1321 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
| 1322 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
| 1323 * vm_page_size()) + framesize_in_bytes; | |
| 1324 // The very lower end of the stack | |
| 1325 address stack_limit = thread->stack_base() - thread->stack_size(); | |
| 1326 return (sp > (stack_limit + reserved_area)); | |
| 1327 } | |
| 1328 | |
| 1329 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
| 1330 uint min_pages) | |
| 1331 { | |
| 1332 assert(min_pages > 0, "sanity"); | |
| 1333 if (UseLargePages) { | |
| 1334 const size_t max_page_size = region_max_size / min_pages; | |
| 1335 | |
| 1336 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
| 1337 const size_t sz = _page_sizes[i]; | |
| 1338 const size_t mask = sz - 1; | |
| 1339 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
| 1340 // The largest page size with no fragmentation. | |
| 1341 return sz; | |
| 1342 } | |
| 1343 | |
| 1344 if (sz <= max_page_size) { | |
| 1345 // The largest page size that satisfies the min_pages requirement. | |
| 1346 return sz; | |
| 1347 } | |
| 1348 } | |
| 1349 } | |
| 1350 | |
| 1351 return vm_page_size(); | |
| 1352 } | |
| 1353 | |
| 1354 #ifndef PRODUCT | |
| 3859 | 1355 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) |
| 1356 { | |
| 1357 if (TracePageSizes) { | |
| 1358 tty->print("%s: ", str); | |
| 1359 for (int i = 0; i < count; ++i) { | |
| 1360 tty->print(" " SIZE_FORMAT, page_sizes[i]); | |
| 1361 } | |
| 1362 tty->cr(); | |
| 1363 } | |
| 1364 } | |
| 1365 | |
| 0 | 1366 void os::trace_page_sizes(const char* str, const size_t region_min_size, |
| 1367 const size_t region_max_size, const size_t page_size, | |
| 1368 const char* base, const size_t size) | |
| 1369 { | |
| 1370 if (TracePageSizes) { | |
| 1371 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
| 1372 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
| 1373 " size=" SIZE_FORMAT, | |
| 1374 str, region_min_size, region_max_size, | |
| 1375 page_size, base, size); | |
| 1376 } | |
| 1377 } | |
| 1378 #endif // #ifndef PRODUCT | |
| 1379 | |
| 1380 // This is the working definition of a server class machine: | |
| 1381 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
| 1382 // because the graphics memory (?) sometimes masks physical memory. | |
| 1383 // If you want to change the definition of a server class machine | |
| 1384 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
| 1385 // then you'll have to parameterize this method based on that state, | |
| 1386 // as was done for logical processors here, or replicate and | |
| 1387 // specialize this method for each platform. (Or fix os to have | |
| 1388 // some inheritance structure and use subclassing. Sigh.) | |
| 1389 // If you want some platform to always or never behave as a server | |
| 1390 // class machine, change the setting of AlwaysActAsServerClassMachine | |
| 1391 // and NeverActAsServerClassMachine in globals*.hpp. | |
| 1392 bool os::is_server_class_machine() { | |
| 1393 // First check for the early returns | |
| 1394 if (NeverActAsServerClassMachine) { | |
| 1395 return false; | |
| 1396 } | |
| 1397 if (AlwaysActAsServerClassMachine) { | |
| 1398 return true; | |
| 1399 } | |
| 1400 // Then actually look at the machine | |
| 1401 bool result = false; | |
| 1402 const unsigned int server_processors = 2; | |
| 1403 const julong server_memory = 2UL * G; | |
| 1404 // We seem not to get our full complement of memory. | |
| 1405 // We allow some part (1/8?) of the memory to be "missing", | |
| 1406 // based on the sizes of DIMMs, and maybe graphics cards. | |
| 1407 const julong missing_memory = 256UL * M; | |
| 1408 | |
| 1409 /* Is this a server class machine? */ | |
| 1410 if ((os::active_processor_count() >= (int)server_processors) && | |
| 1411 (os::physical_memory() >= (server_memory - missing_memory))) { | |
| 1412 const unsigned int logical_processors = | |
| 1413 VM_Version::logical_processors_per_package(); | |
| 1414 if (logical_processors > 1) { | |
| 1415 const unsigned int physical_packages = | |
| 1416 os::active_processor_count() / logical_processors; | |
| 1417 if (physical_packages > server_processors) { | |
| 1418 result = true; | |
| 1419 } | |
| 1420 } else { | |
| 1421 result = true; | |
| 1422 } | |
| 1423 } | |
| 1424 return result; | |
| 1425 } | |
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1426 |
| 10405 | 1427 void os::SuspendedThreadTask::run() { |
| 1428 assert(Threads_lock->owned_by_self() || (_thread == VMThread::vm_thread()), "must have threads lock to call this"); | |
| 1429 internal_do_task(); | |
| 1430 _done = true; | |
| 1431 } | |
| 1432 | |
| 6197 | 1433 bool os::create_stack_guard_pages(char* addr, size_t bytes) { |
| 1434 return os::pd_create_stack_guard_pages(addr, bytes); | |
| 1435 } | |
| 1436 | |
| 1437 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint) { | |
| 1438 char* result = pd_reserve_memory(bytes, addr, alignment_hint); | |
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1439 if (result != NULL) { |
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1440 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
| 6197 | 1441 } |
| 1442 | |
| 1443 return result; | |
| 1444 } | |
|
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1445 |
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1446 char* os::reserve_memory(size_t bytes, char* addr, size_t alignment_hint, |
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1447 MEMFLAGS flags) { |
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1448 char* result = pd_reserve_memory(bytes, addr, alignment_hint); |
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1449 if (result != NULL) { |
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1450 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
|
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1451 MemTracker::record_virtual_memory_type((address)result, flags); |
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1452 } |
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1453 |
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1454 return result; |
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1455 } |
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1456 |
| 6197 | 1457 char* os::attempt_reserve_memory_at(size_t bytes, char* addr) { |
| 1458 char* result = pd_attempt_reserve_memory_at(bytes, addr); | |
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1459 if (result != NULL) { |
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1460 MemTracker::record_virtual_memory_reserve((address)result, bytes, mtNone, CALLER_PC); |
| 6197 | 1461 } |
| 1462 return result; | |
| 1463 } | |
| 1464 | |
| 1465 void os::split_reserved_memory(char *base, size_t size, | |
| 1466 size_t split, bool realloc) { | |
| 1467 pd_split_reserved_memory(base, size, split, realloc); | |
| 1468 } | |
| 1469 | |
| 1470 bool os::commit_memory(char* addr, size_t bytes, bool executable) { | |
| 1471 bool res = pd_commit_memory(addr, bytes, executable); | |
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1472 if (res) { |
| 6197 | 1473 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); |
| 1474 } | |
| 1475 return res; | |
| 1476 } | |
| 1477 | |
| 1478 bool os::commit_memory(char* addr, size_t size, size_t alignment_hint, | |
| 1479 bool executable) { | |
| 1480 bool res = os::pd_commit_memory(addr, size, alignment_hint, executable); | |
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1481 if (res) { |
| 6197 | 1482 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); |
| 1483 } | |
| 1484 return res; | |
| 1485 } | |
| 1486 | |
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1487 void os::commit_memory_or_exit(char* addr, size_t bytes, bool executable, |
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1488 const char* mesg) { |
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1489 pd_commit_memory_or_exit(addr, bytes, executable, mesg); |
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1490 MemTracker::record_virtual_memory_commit((address)addr, bytes, CALLER_PC); |
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1491 } |
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1492 |
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1493 void os::commit_memory_or_exit(char* addr, size_t size, size_t alignment_hint, |
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1494 bool executable, const char* mesg) { |
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1495 os::pd_commit_memory_or_exit(addr, size, alignment_hint, executable, mesg); |
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1496 MemTracker::record_virtual_memory_commit((address)addr, size, CALLER_PC); |
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1497 } |
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1498 |
| 6197 | 1499 bool os::uncommit_memory(char* addr, size_t bytes) { |
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1500 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_uncommit_tracker(); |
| 6197 | 1501 bool res = pd_uncommit_memory(addr, bytes); |
| 1502 if (res) { | |
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1503 tkr.record((address)addr, bytes); |
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1504 } else { |
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1505 tkr.discard(); |
| 6197 | 1506 } |
| 1507 return res; | |
| 1508 } | |
| 1509 | |
| 1510 bool os::release_memory(char* addr, size_t bytes) { | |
|
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1511 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
| 6197 | 1512 bool res = pd_release_memory(addr, bytes); |
| 1513 if (res) { | |
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1514 tkr.record((address)addr, bytes); |
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1515 } else { |
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1516 tkr.discard(); |
| 6197 | 1517 } |
| 1518 return res; | |
| 1519 } | |
| 1520 | |
| 1521 | |
| 1522 char* os::map_memory(int fd, const char* file_name, size_t file_offset, | |
| 1523 char *addr, size_t bytes, bool read_only, | |
| 1524 bool allow_exec) { | |
| 1525 char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec); | |
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1526 if (result != NULL) { |
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1527 MemTracker::record_virtual_memory_reserve_and_commit((address)result, bytes, mtNone, CALLER_PC); |
| 6197 | 1528 } |
| 1529 return result; | |
| 1530 } | |
| 1531 | |
| 1532 char* os::remap_memory(int fd, const char* file_name, size_t file_offset, | |
| 1533 char *addr, size_t bytes, bool read_only, | |
| 1534 bool allow_exec) { | |
| 1535 return pd_remap_memory(fd, file_name, file_offset, addr, bytes, | |
| 1536 read_only, allow_exec); | |
| 1537 } | |
| 1538 | |
| 1539 bool os::unmap_memory(char *addr, size_t bytes) { | |
|
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1540 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
| 6197 | 1541 bool result = pd_unmap_memory(addr, bytes); |
| 1542 if (result) { | |
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1543 tkr.record((address)addr, bytes); |
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1544 } else { |
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1545 tkr.discard(); |
| 6197 | 1546 } |
| 1547 return result; | |
| 1548 } | |
| 1549 | |
| 1550 void os::free_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
| 1551 pd_free_memory(addr, bytes, alignment_hint); | |
| 1552 } | |
| 1553 | |
| 1554 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
| 1555 pd_realign_memory(addr, bytes, alignment_hint); | |
| 1556 } | |
| 1557 | |
| 10405 | 1558 #ifndef TARGET_OS_FAMILY_windows |
| 1559 /* try to switch state from state "from" to state "to" | |
| 1560 * returns the state set after the method is complete | |
| 1561 */ | |
| 1562 os::SuspendResume::State os::SuspendResume::switch_state(os::SuspendResume::State from, | |
| 1563 os::SuspendResume::State to) | |
| 1564 { | |
| 1565 os::SuspendResume::State result = | |
| 1566 (os::SuspendResume::State) Atomic::cmpxchg((jint) to, (jint *) &_state, (jint) from); | |
| 1567 if (result == from) { | |
| 1568 // success | |
| 1569 return to; | |
| 1570 } | |
| 1571 return result; | |
| 1572 } | |
| 1573 #endif |