Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 1642:0e7d2a08b605
6967423: Hotspot support for modules image
Summary: Add hotspot support for modules image
Reviewed-by: acorn
| author | mchung |
|---|---|
| date | Wed, 07 Jul 2010 15:35:58 -0700 |
| parents | c18cbe5936b8 |
| children | 126ea7725993 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1997, 2009, 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 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_os.cpp.incl" | |
| 27 | |
| 28 # include <signal.h> | |
| 29 | |
| 30 OSThread* os::_starting_thread = NULL; | |
| 31 address os::_polling_page = NULL; | |
| 32 volatile int32_t* os::_mem_serialize_page = NULL; | |
| 33 uintptr_t os::_serialize_page_mask = 0; | |
| 34 long os::_rand_seed = 1; | |
| 35 int os::_processor_count = 0; | |
| 36 size_t os::_page_sizes[os::page_sizes_max]; | |
| 37 | |
| 38 #ifndef PRODUCT | |
| 39 int os::num_mallocs = 0; // # of calls to malloc/realloc | |
| 40 size_t os::alloc_bytes = 0; // # of bytes allocated | |
| 41 int os::num_frees = 0; // # of calls to free | |
| 42 #endif | |
| 43 | |
| 44 // Fill in buffer with current local time as an ISO-8601 string. | |
| 45 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
| 46 // Returns buffer, or NULL if it failed. | |
| 47 // This would mostly be a call to | |
| 48 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
| 49 // except that on Windows the %z behaves badly, so we do it ourselves. | |
| 50 // Also, people wanted milliseconds on there, | |
| 51 // and strftime doesn't do milliseconds. | |
| 52 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
| 53 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
| 54 // 1 2 | |
| 55 // 12345678901234567890123456789 | |
| 56 static const char* iso8601_format = | |
| 57 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
| 58 static const size_t needed_buffer = 29; | |
| 59 | |
| 60 // Sanity check the arguments | |
| 61 if (buffer == NULL) { | |
| 62 assert(false, "NULL buffer"); | |
| 63 return NULL; | |
| 64 } | |
| 65 if (buffer_length < needed_buffer) { | |
| 66 assert(false, "buffer_length too small"); | |
| 67 return NULL; | |
| 68 } | |
| 69 // Get the current time | |
| 61 | 70 jlong milliseconds_since_19700101 = javaTimeMillis(); |
| 0 | 71 const int milliseconds_per_microsecond = 1000; |
| 72 const time_t seconds_since_19700101 = | |
| 73 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
| 74 const int milliseconds_after_second = | |
| 75 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
| 76 // Convert the time value to a tm and timezone variable | |
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77 struct tm time_struct; |
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78 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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79 assert(false, "Failed localtime_pd"); |
| 0 | 80 return NULL; |
| 81 } | |
| 82 const time_t zone = timezone; | |
| 83 | |
| 84 // If daylight savings time is in effect, | |
| 85 // we are 1 hour East of our time zone | |
| 86 const time_t seconds_per_minute = 60; | |
| 87 const time_t minutes_per_hour = 60; | |
| 88 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
| 89 time_t UTC_to_local = zone; | |
| 90 if (time_struct.tm_isdst > 0) { | |
| 91 UTC_to_local = UTC_to_local - seconds_per_hour; | |
| 92 } | |
| 93 // Compute the time zone offset. | |
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94 // localtime_pd() sets timezone to the difference (in seconds) |
| 0 | 95 // between UTC and and local time. |
| 96 // ISO 8601 says we need the difference between local time and UTC, | |
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97 // we change the sign of the localtime_pd() result. |
| 0 | 98 const time_t local_to_UTC = -(UTC_to_local); |
| 99 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
| 100 char sign_local_to_UTC = '+'; | |
| 101 time_t abs_local_to_UTC = local_to_UTC; | |
| 102 if (local_to_UTC < 0) { | |
| 103 sign_local_to_UTC = '-'; | |
| 104 abs_local_to_UTC = -(abs_local_to_UTC); | |
| 105 } | |
| 106 // Convert time zone offset seconds to hours and minutes. | |
| 107 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
| 108 const time_t zone_min = | |
| 109 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
| 110 | |
| 111 // Print an ISO 8601 date and time stamp into the buffer | |
| 112 const int year = 1900 + time_struct.tm_year; | |
| 113 const int month = 1 + time_struct.tm_mon; | |
| 114 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
| 115 year, | |
| 116 month, | |
| 117 time_struct.tm_mday, | |
| 118 time_struct.tm_hour, | |
| 119 time_struct.tm_min, | |
| 120 time_struct.tm_sec, | |
| 121 milliseconds_after_second, | |
| 122 sign_local_to_UTC, | |
| 123 zone_hours, | |
| 124 zone_min); | |
| 125 if (printed == 0) { | |
| 126 assert(false, "Failed jio_printf"); | |
| 127 return NULL; | |
| 128 } | |
| 129 return buffer; | |
| 130 } | |
| 131 | |
| 132 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
| 133 #ifdef ASSERT | |
| 134 if (!(!thread->is_Java_thread() || | |
| 135 Thread::current() == thread || | |
| 136 Threads_lock->owned_by_self() | |
| 137 || thread->is_Compiler_thread() | |
| 138 )) { | |
| 139 assert(false, "possibility of dangling Thread pointer"); | |
| 140 } | |
| 141 #endif | |
| 142 | |
| 143 if (p >= MinPriority && p <= MaxPriority) { | |
| 144 int priority = java_to_os_priority[p]; | |
| 145 return set_native_priority(thread, priority); | |
| 146 } else { | |
| 147 assert(false, "Should not happen"); | |
| 148 return OS_ERR; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 | |
| 153 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { | |
| 154 int p; | |
| 155 int os_prio; | |
| 156 OSReturn ret = get_native_priority(thread, &os_prio); | |
| 157 if (ret != OS_OK) return ret; | |
| 158 | |
| 159 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
| 160 priority = (ThreadPriority)p; | |
| 161 return OS_OK; | |
| 162 } | |
| 163 | |
| 164 | |
| 165 // --------------------- sun.misc.Signal (optional) --------------------- | |
| 166 | |
| 167 | |
| 168 // SIGBREAK is sent by the keyboard to query the VM state | |
| 169 #ifndef SIGBREAK | |
| 170 #define SIGBREAK SIGQUIT | |
| 171 #endif | |
| 172 | |
| 173 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
| 174 | |
| 175 | |
| 176 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
| 177 os::set_priority(thread, NearMaxPriority); | |
| 178 while (true) { | |
| 179 int sig; | |
| 180 { | |
| 181 // FIXME : Currently we have not decieded what should be the status | |
| 182 // for this java thread blocked here. Once we decide about | |
| 183 // that we should fix this. | |
| 184 sig = os::signal_wait(); | |
| 185 } | |
| 186 if (sig == os::sigexitnum_pd()) { | |
| 187 // Terminate the signal thread | |
| 188 return; | |
| 189 } | |
| 190 | |
| 191 switch (sig) { | |
| 192 case SIGBREAK: { | |
| 193 // Check if the signal is a trigger to start the Attach Listener - in that | |
| 194 // case don't print stack traces. | |
| 195 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
| 196 continue; | |
| 197 } | |
| 198 // Print stack traces | |
| 199 // Any SIGBREAK operations added here should make sure to flush | |
| 200 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
| 201 // Each module also prints an extra carriage return after its output. | |
| 202 VM_PrintThreads op; | |
| 203 VMThread::execute(&op); | |
| 204 VM_PrintJNI jni_op; | |
| 205 VMThread::execute(&jni_op); | |
| 206 VM_FindDeadlocks op1(tty); | |
| 207 VMThread::execute(&op1); | |
| 208 Universe::print_heap_at_SIGBREAK(); | |
| 209 if (PrintClassHistogram) { | |
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210 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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211 true /* need_prologue */); |
| 0 | 212 VMThread::execute(&op1); |
| 213 } | |
| 214 if (JvmtiExport::should_post_data_dump()) { | |
| 215 JvmtiExport::post_data_dump(); | |
| 216 } | |
| 217 break; | |
| 218 } | |
| 219 default: { | |
| 220 // Dispatch the signal to java | |
| 221 HandleMark hm(THREAD); | |
| 222 klassOop k = SystemDictionary::resolve_or_null(vmSymbolHandles::sun_misc_Signal(), THREAD); | |
| 223 KlassHandle klass (THREAD, k); | |
| 224 if (klass.not_null()) { | |
| 225 JavaValue result(T_VOID); | |
| 226 JavaCallArguments args; | |
| 227 args.push_int(sig); | |
| 228 JavaCalls::call_static( | |
| 229 &result, | |
| 230 klass, | |
| 231 vmSymbolHandles::dispatch_name(), | |
| 232 vmSymbolHandles::int_void_signature(), | |
| 233 &args, | |
| 234 THREAD | |
| 235 ); | |
| 236 } | |
| 237 if (HAS_PENDING_EXCEPTION) { | |
| 238 // tty is initialized early so we don't expect it to be null, but | |
| 239 // if it is we can't risk doing an initialization that might | |
| 240 // trigger additional out-of-memory conditions | |
| 241 if (tty != NULL) { | |
| 242 char klass_name[256]; | |
| 243 char tmp_sig_name[16]; | |
| 244 const char* sig_name = "UNKNOWN"; | |
| 245 instanceKlass::cast(PENDING_EXCEPTION->klass())-> | |
| 246 name()->as_klass_external_name(klass_name, 256); | |
| 247 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
| 248 sig_name = tmp_sig_name; | |
| 249 warning("Exception %s occurred dispatching signal %s to handler" | |
| 250 "- the VM may need to be forcibly terminated", | |
| 251 klass_name, sig_name ); | |
| 252 } | |
| 253 CLEAR_PENDING_EXCEPTION; | |
| 254 } | |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 | |
| 261 void os::signal_init() { | |
| 262 if (!ReduceSignalUsage) { | |
| 263 // Setup JavaThread for processing signals | |
| 264 EXCEPTION_MARK; | |
| 265 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
| 266 instanceKlassHandle klass (THREAD, k); | |
| 267 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 268 | |
| 269 const char thread_name[] = "Signal Dispatcher"; | |
| 270 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
| 271 | |
| 272 // Initialize thread_oop to put it into the system threadGroup | |
| 273 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 274 JavaValue result(T_VOID); | |
| 275 JavaCalls::call_special(&result, thread_oop, | |
| 276 klass, | |
| 277 vmSymbolHandles::object_initializer_name(), | |
| 278 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 279 thread_group, | |
| 280 string, | |
| 281 CHECK); | |
| 282 | |
| 1142 | 283 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 284 JavaCalls::call_special(&result, |
| 285 thread_group, | |
| 286 group, | |
| 287 vmSymbolHandles::add_method_name(), | |
| 288 vmSymbolHandles::thread_void_signature(), | |
| 289 thread_oop, // ARG 1 | |
| 290 CHECK); | |
| 291 | |
| 292 os::signal_init_pd(); | |
| 293 | |
| 294 { MutexLocker mu(Threads_lock); | |
| 295 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
| 296 | |
| 297 // At this point it may be possible that no osthread was created for the | |
| 298 // JavaThread due to lack of memory. We would have to throw an exception | |
| 299 // in that case. However, since this must work and we do not allow | |
| 300 // exceptions anyway, check and abort if this fails. | |
| 301 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
| 302 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 303 "unable to create new native thread"); | |
| 304 } | |
| 305 | |
| 306 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
| 307 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 308 java_lang_Thread::set_daemon(thread_oop()); | |
| 309 | |
| 310 signal_thread->set_threadObj(thread_oop()); | |
| 311 Threads::add(signal_thread); | |
| 312 Thread::start(signal_thread); | |
| 313 } | |
| 314 // Handle ^BREAK | |
| 315 os::signal(SIGBREAK, os::user_handler()); | |
| 316 } | |
| 317 } | |
| 318 | |
| 319 | |
| 320 void os::terminate_signal_thread() { | |
| 321 if (!ReduceSignalUsage) | |
| 322 signal_notify(sigexitnum_pd()); | |
| 323 } | |
| 324 | |
| 325 | |
| 326 // --------------------- loading libraries --------------------- | |
| 327 | |
| 328 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
| 329 extern struct JavaVM_ main_vm; | |
| 330 | |
| 331 static void* _native_java_library = NULL; | |
| 332 | |
| 333 void* os::native_java_library() { | |
| 334 if (_native_java_library == NULL) { | |
| 335 char buffer[JVM_MAXPATHLEN]; | |
| 336 char ebuf[1024]; | |
| 337 | |
| 242 | 338 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
| 339 // always able to find it when the loading executable is outside the JDK. | |
| 0 | 340 // In order to keep working with 1.2 we ignore any loading errors. |
| 242 | 341 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"); |
| 342 dll_load(buffer, ebuf, sizeof(ebuf)); | |
| 0 | 343 |
| 344 // Load java dll | |
| 242 | 345 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java"); |
| 346 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); | |
| 0 | 347 if (_native_java_library == NULL) { |
| 348 vm_exit_during_initialization("Unable to load native library", ebuf); | |
| 349 } | |
| 242 | 350 } |
| 351 static jboolean onLoaded = JNI_FALSE; | |
| 352 if (onLoaded) { | |
| 353 // We may have to wait to fire OnLoad until TLS is initialized. | |
| 354 if (ThreadLocalStorage::is_initialized()) { | |
| 355 // The JNI_OnLoad handling is normally done by method load in | |
| 356 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
| 357 // explicitly so we have to check for JNI_OnLoad as well | |
| 358 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
| 359 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
| 360 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
| 361 if (JNI_OnLoad != NULL) { | |
| 362 JavaThread* thread = JavaThread::current(); | |
| 363 ThreadToNativeFromVM ttn(thread); | |
| 364 HandleMark hm(thread); | |
| 365 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
| 366 onLoaded = JNI_TRUE; | |
| 367 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
| 368 vm_exit_during_initialization("Unsupported JNI version"); | |
| 369 } | |
| 0 | 370 } |
| 371 } | |
| 372 } | |
| 373 return _native_java_library; | |
| 374 } | |
| 375 | |
| 376 // --------------------- heap allocation utilities --------------------- | |
| 377 | |
| 378 char *os::strdup(const char *str) { | |
| 379 size_t size = strlen(str); | |
| 380 char *dup_str = (char *)malloc(size + 1); | |
| 381 if (dup_str == NULL) return NULL; | |
| 382 strcpy(dup_str, str); | |
| 383 return dup_str; | |
| 384 } | |
| 385 | |
| 386 | |
| 387 | |
| 388 #ifdef ASSERT | |
| 389 #define space_before (MallocCushion + sizeof(double)) | |
| 390 #define space_after MallocCushion | |
| 391 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
| 392 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
| 393 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
| 394 // NB: cannot be debug variable, because these aren't set from the command line until | |
| 395 // *after* the first few allocs already happened | |
| 396 #define MallocCushion 16 | |
| 397 #else | |
| 398 #define space_before 0 | |
| 399 #define space_after 0 | |
| 400 #define size_addr_from_base(p) should not use w/o ASSERT | |
| 401 #define size_addr_from_obj(p) should not use w/o ASSERT | |
| 402 #define MallocCushion 0 | |
| 403 #endif | |
| 404 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
| 405 | |
| 406 #ifdef ASSERT | |
| 407 inline size_t get_size(void* obj) { | |
| 408 size_t size = *size_addr_from_obj(obj); | |
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409 if (size < 0) { |
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410 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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411 SIZE_FORMAT ")", obj, size)); |
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412 } |
| 0 | 413 return size; |
| 414 } | |
| 415 | |
| 416 u_char* find_cushion_backwards(u_char* start) { | |
| 417 u_char* p = start; | |
| 418 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
| 419 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
| 420 // ok, we have four consecutive marker bytes; find start | |
| 421 u_char* q = p - 4; | |
| 422 while (*q == badResourceValue) q--; | |
| 423 return q + 1; | |
| 424 } | |
| 425 | |
| 426 u_char* find_cushion_forwards(u_char* start) { | |
| 427 u_char* p = start; | |
| 428 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
| 429 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
| 430 // ok, we have four consecutive marker bytes; find end of cushion | |
| 431 u_char* q = p + 4; | |
| 432 while (*q == badResourceValue) q++; | |
| 433 return q - MallocCushion; | |
| 434 } | |
| 435 | |
| 436 void print_neighbor_blocks(void* ptr) { | |
| 437 // find block allocated before ptr (not entirely crash-proof) | |
| 438 if (MallocCushion < 4) { | |
| 439 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
| 440 return; | |
| 441 } | |
| 442 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
| 443 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
| 444 // look for cushion in front of prev. block | |
| 445 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
| 446 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
| 447 u_char* obj = start_of_prev_block + space_before; | |
| 448 if (size <= 0 ) { | |
| 449 // start is bad; mayhave been confused by OS data inbetween objects | |
| 450 // search one more backwards | |
| 451 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
| 452 size = *size_addr_from_base(start_of_prev_block); | |
| 453 obj = start_of_prev_block + space_before; | |
| 454 } | |
| 455 | |
| 456 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
| 457 tty->print_cr("### previous object: %p (%ld bytes)", obj, size); | |
| 458 } else { | |
| 459 tty->print_cr("### previous object (not sure if correct): %p (%ld bytes)", obj, size); | |
| 460 } | |
| 461 | |
| 462 // now find successor block | |
| 463 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
| 464 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
| 465 u_char* next_obj = start_of_next_block + space_before; | |
| 466 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
| 467 if (start_of_next_block[0] == badResourceValue && | |
| 468 start_of_next_block[1] == badResourceValue && | |
| 469 start_of_next_block[2] == badResourceValue && | |
| 470 start_of_next_block[3] == badResourceValue) { | |
| 471 tty->print_cr("### next object: %p (%ld bytes)", next_obj, next_size); | |
| 472 } else { | |
| 473 tty->print_cr("### next object (not sure if correct): %p (%ld bytes)", next_obj, next_size); | |
| 474 } | |
| 475 } | |
| 476 | |
| 477 | |
| 478 void report_heap_error(void* memblock, void* bad, const char* where) { | |
| 479 tty->print_cr("## nof_mallocs = %d, nof_frees = %d", os::num_mallocs, os::num_frees); | |
| 480 tty->print_cr("## memory stomp: byte at %p %s object %p", bad, where, memblock); | |
| 481 print_neighbor_blocks(memblock); | |
| 482 fatal("memory stomping error"); | |
| 483 } | |
| 484 | |
| 485 void verify_block(void* memblock) { | |
| 486 size_t size = get_size(memblock); | |
| 487 if (MallocCushion) { | |
| 488 u_char* ptr = (u_char*)memblock - space_before; | |
| 489 for (int i = 0; i < MallocCushion; i++) { | |
| 490 if (ptr[i] != badResourceValue) { | |
| 491 report_heap_error(memblock, ptr+i, "in front of"); | |
| 492 } | |
| 493 } | |
| 494 u_char* end = (u_char*)memblock + size + space_after; | |
| 495 for (int j = -MallocCushion; j < 0; j++) { | |
| 496 if (end[j] != badResourceValue) { | |
| 497 report_heap_error(memblock, end+j, "after"); | |
| 498 } | |
| 499 } | |
| 500 } | |
| 501 } | |
| 502 #endif | |
| 503 | |
| 504 void* os::malloc(size_t size) { | |
| 505 NOT_PRODUCT(num_mallocs++); | |
| 506 NOT_PRODUCT(alloc_bytes += size); | |
| 507 | |
| 508 if (size == 0) { | |
| 509 // return a valid pointer if size is zero | |
| 510 // if NULL is returned the calling functions assume out of memory. | |
| 511 size = 1; | |
| 512 } | |
| 513 | |
| 514 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 515 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
| 516 #ifdef ASSERT | |
| 517 if (ptr == NULL) return NULL; | |
| 518 if (MallocCushion) { | |
| 519 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
| 520 u_char* end = ptr + space_before + size; | |
| 521 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
| 522 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
| 523 } | |
| 524 // put size just before data | |
| 525 *size_addr_from_base(ptr) = size; | |
| 526 #endif | |
| 527 u_char* memblock = ptr + space_before; | |
| 528 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 529 tty->print_cr("os::malloc caught, %lu bytes --> %p", size, memblock); | |
| 530 breakpoint(); | |
| 531 } | |
| 532 debug_only(if (paranoid) verify_block(memblock)); | |
| 533 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc %lu bytes --> %p", size, memblock); | |
| 534 return memblock; | |
| 535 } | |
| 536 | |
| 537 | |
| 538 void* os::realloc(void *memblock, size_t size) { | |
| 539 NOT_PRODUCT(num_mallocs++); | |
| 540 NOT_PRODUCT(alloc_bytes += size); | |
| 541 #ifndef ASSERT | |
| 542 return ::realloc(memblock, size); | |
| 543 #else | |
| 544 if (memblock == NULL) { | |
| 545 return os::malloc(size); | |
| 546 } | |
| 547 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 548 tty->print_cr("os::realloc caught %p", memblock); | |
| 549 breakpoint(); | |
| 550 } | |
| 551 verify_block(memblock); | |
| 552 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 553 if (size == 0) return NULL; | |
| 554 // always move the block | |
| 555 void* ptr = malloc(size); | |
| 556 if (PrintMalloc) tty->print_cr("os::remalloc %lu bytes, %p --> %p", size, memblock, ptr); | |
| 557 // Copy to new memory if malloc didn't fail | |
| 558 if ( ptr != NULL ) { | |
| 559 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
| 560 if (paranoid) verify_block(ptr); | |
| 561 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
| 562 tty->print_cr("os::realloc caught, %lu bytes --> %p", size, ptr); | |
| 563 breakpoint(); | |
| 564 } | |
| 565 free(memblock); | |
| 566 } | |
| 567 return ptr; | |
| 568 #endif | |
| 569 } | |
| 570 | |
| 571 | |
| 572 void os::free(void *memblock) { | |
| 573 NOT_PRODUCT(num_frees++); | |
| 574 #ifdef ASSERT | |
| 575 if (memblock == NULL) return; | |
| 576 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 577 if (tty != NULL) tty->print_cr("os::free caught %p", memblock); | |
| 578 breakpoint(); | |
| 579 } | |
| 580 verify_block(memblock); | |
| 581 if (PrintMalloc && tty != NULL) | |
| 582 // tty->print_cr("os::free %p", memblock); | |
| 583 fprintf(stderr, "os::free %p\n", memblock); | |
| 584 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 585 // Added by detlefs. | |
| 586 if (MallocCushion) { | |
| 587 u_char* ptr = (u_char*)memblock - space_before; | |
| 588 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
| 589 guarantee(*p == badResourceValue, | |
| 590 "Thing freed should be malloc result."); | |
| 591 *p = (u_char)freeBlockPad; | |
| 592 } | |
| 593 size_t size = get_size(memblock); | |
| 594 u_char* end = ptr + space_before + size; | |
| 595 for (u_char* q = end; q < end + MallocCushion; q++) { | |
| 596 guarantee(*q == badResourceValue, | |
| 597 "Thing freed should be malloc result."); | |
| 598 *q = (u_char)freeBlockPad; | |
| 599 } | |
| 600 } | |
| 601 #endif | |
| 602 ::free((char*)memblock - space_before); | |
| 603 } | |
| 604 | |
| 605 void os::init_random(long initval) { | |
| 606 _rand_seed = initval; | |
| 607 } | |
| 608 | |
| 609 | |
| 610 long os::random() { | |
| 611 /* standard, well-known linear congruential random generator with | |
| 612 * next_rand = (16807*seed) mod (2**31-1) | |
| 613 * see | |
| 614 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
| 615 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
| 616 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
| 617 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
| 618 */ | |
| 619 const long a = 16807; | |
| 620 const unsigned long m = 2147483647; | |
| 621 const long q = m / a; assert(q == 127773, "weird math"); | |
| 622 const long r = m % a; assert(r == 2836, "weird math"); | |
| 623 | |
| 624 // compute az=2^31p+q | |
| 625 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
| 626 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
| 627 lo += (hi & 0x7FFF) << 16; | |
| 628 | |
| 629 // if q overflowed, ignore the overflow and increment q | |
| 630 if (lo > m) { | |
| 631 lo &= m; | |
| 632 ++lo; | |
| 633 } | |
| 634 lo += hi >> 15; | |
| 635 | |
| 636 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
| 637 if (lo > m) { | |
| 638 lo &= m; | |
| 639 ++lo; | |
| 640 } | |
| 641 return (_rand_seed = lo); | |
| 642 } | |
| 643 | |
| 644 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
| 645 // conditions in which a thread is first started are different from those in which | |
| 646 // a suspension is resumed. These differences make it hard for us to apply the | |
| 647 // tougher checks when starting threads that we want to do when resuming them. | |
| 648 // However, when start_thread is called as a result of Thread.start, on a Java | |
| 649 // thread, the operation is synchronized on the Java Thread object. So there | |
| 650 // cannot be a race to start the thread and hence for the thread to exit while | |
| 651 // we are working on it. Non-Java threads that start Java threads either have | |
| 652 // to do so in a context in which races are impossible, or should do appropriate | |
| 653 // locking. | |
| 654 | |
| 655 void os::start_thread(Thread* thread) { | |
| 656 // guard suspend/resume | |
| 657 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 658 OSThread* osthread = thread->osthread(); | |
| 659 osthread->set_state(RUNNABLE); | |
| 660 pd_start_thread(thread); | |
| 661 } | |
| 662 | |
| 663 //--------------------------------------------------------------------------- | |
| 664 // Helper functions for fatal error handler | |
| 665 | |
| 666 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
| 667 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
| 668 | |
| 669 int cols = 0; | |
| 670 int cols_per_line = 0; | |
| 671 switch (unitsize) { | |
| 672 case 1: cols_per_line = 16; break; | |
| 673 case 2: cols_per_line = 8; break; | |
| 674 case 4: cols_per_line = 4; break; | |
| 675 case 8: cols_per_line = 2; break; | |
| 676 default: return; | |
| 677 } | |
| 678 | |
| 679 address p = start; | |
| 680 st->print(PTR_FORMAT ": ", start); | |
| 681 while (p < end) { | |
| 682 switch (unitsize) { | |
| 683 case 1: st->print("%02x", *(u1*)p); break; | |
| 684 case 2: st->print("%04x", *(u2*)p); break; | |
| 685 case 4: st->print("%08x", *(u4*)p); break; | |
| 686 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
| 687 } | |
| 688 p += unitsize; | |
| 689 cols++; | |
| 690 if (cols >= cols_per_line && p < end) { | |
| 691 cols = 0; | |
| 692 st->cr(); | |
| 693 st->print(PTR_FORMAT ": ", p); | |
| 694 } else { | |
| 695 st->print(" "); | |
| 696 } | |
| 697 } | |
| 698 st->cr(); | |
| 699 } | |
| 700 | |
| 701 void os::print_environment_variables(outputStream* st, const char** env_list, | |
| 702 char* buffer, int len) { | |
| 703 if (env_list) { | |
| 704 st->print_cr("Environment Variables:"); | |
| 705 | |
| 706 for (int i = 0; env_list[i] != NULL; i++) { | |
| 707 if (getenv(env_list[i], buffer, len)) { | |
| 708 st->print(env_list[i]); | |
| 709 st->print("="); | |
| 710 st->print_cr(buffer); | |
| 711 } | |
| 712 } | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 void os::print_cpu_info(outputStream* st) { | |
| 717 // cpu | |
| 718 st->print("CPU:"); | |
| 719 st->print("total %d", os::processor_count()); | |
| 720 // It's not safe to query number of active processors after crash | |
| 721 // st->print("(active %d)", os::active_processor_count()); | |
| 722 st->print(" %s", VM_Version::cpu_features()); | |
| 723 st->cr(); | |
| 724 } | |
| 725 | |
| 726 void os::print_date_and_time(outputStream *st) { | |
| 727 time_t tloc; | |
| 728 (void)time(&tloc); | |
| 729 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
| 730 | |
| 731 double t = os::elapsedTime(); | |
| 732 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
| 733 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
| 734 // before printf. We lost some precision, but who cares? | |
| 735 st->print_cr("elapsed time: %d seconds", (int)t); | |
| 736 } | |
| 737 | |
| 738 | |
| 739 // Looks like all platforms except IA64 can use the same function to check | |
| 740 // if C stack is walkable beyond current frame. The check for fp() is not | |
| 741 // necessary on Sparc, but it's harmless. | |
| 742 bool os::is_first_C_frame(frame* fr) { | |
| 743 #ifdef IA64 | |
| 744 // In order to walk native frames on Itanium, we need to access the unwind | |
| 745 // table, which is inside ELF. We don't want to parse ELF after fatal error, | |
| 746 // so return true for IA64. If we need to support C stack walking on IA64, | |
| 747 // this function needs to be moved to CPU specific files, as fp() on IA64 | |
| 748 // is register stack, which grows towards higher memory address. | |
| 749 return true; | |
| 750 #endif | |
| 751 | |
| 752 // Load up sp, fp, sender sp and sender fp, check for reasonable values. | |
| 753 // Check usp first, because if that's bad the other accessors may fault | |
| 754 // on some architectures. Ditto ufp second, etc. | |
| 755 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
| 756 // sp on amd can be 32 bit aligned. | |
| 757 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
| 758 | |
| 759 uintptr_t usp = (uintptr_t)fr->sp(); | |
| 760 if ((usp & sp_align_mask) != 0) return true; | |
| 761 | |
| 762 uintptr_t ufp = (uintptr_t)fr->fp(); | |
| 763 if ((ufp & fp_align_mask) != 0) return true; | |
| 764 | |
| 765 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
| 766 if ((old_sp & sp_align_mask) != 0) return true; | |
| 767 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
| 768 | |
| 769 uintptr_t old_fp = (uintptr_t)fr->link(); | |
| 770 if ((old_fp & fp_align_mask) != 0) return true; | |
| 771 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
| 772 | |
| 773 // stack grows downwards; if old_fp is below current fp or if the stack | |
| 774 // frame is too large, either the stack is corrupted or fp is not saved | |
| 775 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
| 776 // is not walkable beyond current frame. | |
| 777 if (old_fp < ufp) return true; | |
| 778 if (old_fp - ufp > 64 * K) return true; | |
| 779 | |
| 780 return false; | |
| 781 } | |
| 782 | |
| 783 #ifdef ASSERT | |
| 784 extern "C" void test_random() { | |
| 785 const double m = 2147483647; | |
| 786 double mean = 0.0, variance = 0.0, t; | |
| 787 long reps = 10000; | |
| 788 unsigned long seed = 1; | |
| 789 | |
| 790 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
| 791 os::init_random(seed); | |
| 792 long num; | |
| 793 for (int k = 0; k < reps; k++) { | |
| 794 num = os::random(); | |
| 795 double u = (double)num / m; | |
| 796 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
| 797 | |
| 798 // calculate mean and variance of the random sequence | |
| 799 mean += u; | |
| 800 variance += (u*u); | |
| 801 } | |
| 802 mean /= reps; | |
| 803 variance /= (reps - 1); | |
| 804 | |
| 805 assert(num == 1043618065, "bad seed"); | |
| 806 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
| 807 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
| 808 const double eps = 0.0001; | |
| 809 t = fabsd(mean - 0.5018); | |
| 810 assert(t < eps, "bad mean"); | |
| 811 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
| 812 assert(t < eps, "bad variance"); | |
| 813 } | |
| 814 #endif | |
| 815 | |
| 816 | |
| 817 // Set up the boot classpath. | |
| 818 | |
| 819 char* os::format_boot_path(const char* format_string, | |
| 820 const char* home, | |
| 821 int home_len, | |
| 822 char fileSep, | |
| 823 char pathSep) { | |
| 824 assert((fileSep == '/' && pathSep == ':') || | |
| 825 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
| 826 | |
| 827 // Scan the format string to determine the length of the actual | |
| 828 // boot classpath, and handle platform dependencies as well. | |
| 829 int formatted_path_len = 0; | |
| 830 const char* p; | |
| 831 for (p = format_string; *p != 0; ++p) { | |
| 832 if (*p == '%') formatted_path_len += home_len - 1; | |
| 833 ++formatted_path_len; | |
| 834 } | |
| 835 | |
| 836 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1); | |
| 837 if (formatted_path == NULL) { | |
| 838 return NULL; | |
| 839 } | |
| 840 | |
| 841 // Create boot classpath from format, substituting separator chars and | |
| 842 // java home directory. | |
| 843 char* q = formatted_path; | |
| 844 for (p = format_string; *p != 0; ++p) { | |
| 845 switch (*p) { | |
| 846 case '%': | |
| 847 strcpy(q, home); | |
| 848 q += home_len; | |
| 849 break; | |
| 850 case '/': | |
| 851 *q++ = fileSep; | |
| 852 break; | |
| 853 case ':': | |
| 854 *q++ = pathSep; | |
| 855 break; | |
| 856 default: | |
| 857 *q++ = *p; | |
| 858 } | |
| 859 } | |
| 860 *q = '\0'; | |
| 861 | |
| 862 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
| 863 return formatted_path; | |
| 864 } | |
| 865 | |
| 866 | |
| 867 bool os::set_boot_path(char fileSep, char pathSep) { | |
| 868 const char* home = Arguments::get_java_home(); | |
| 869 int home_len = (int)strlen(home); | |
| 870 | |
| 871 static const char* meta_index_dir_format = "%/lib/"; | |
| 872 static const char* meta_index_format = "%/lib/meta-index"; | |
| 873 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
| 874 if (meta_index == NULL) return false; | |
| 875 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
| 876 if (meta_index_dir == NULL) return false; | |
| 877 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
| 878 | |
| 879 // Any modification to the JAR-file list, for the boot classpath must be | |
| 880 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
| 881 // path class JARs, are stripped for StackMapTable to reduce download size. | |
| 882 static const char classpath_format[] = | |
| 883 "%/lib/resources.jar:" | |
| 884 "%/lib/rt.jar:" | |
| 885 "%/lib/sunrsasign.jar:" | |
| 886 "%/lib/jsse.jar:" | |
| 887 "%/lib/jce.jar:" | |
| 888 "%/lib/charsets.jar:" | |
| 1642 | 889 |
| 890 // ## TEMPORARY hack to keep the legacy launcher working when | |
| 891 // ## only the boot module is installed (cf. j.l.ClassLoader) | |
| 892 "%/lib/modules/jdk.boot.jar:" | |
| 893 | |
| 0 | 894 "%/classes"; |
| 895 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
| 896 if (sysclasspath == NULL) return false; | |
| 897 Arguments::set_sysclasspath(sysclasspath); | |
| 898 | |
| 899 return true; | |
| 900 } | |
| 901 | |
| 691 | 902 /* |
| 903 * Splits a path, based on its separator, the number of | |
| 904 * elements is returned back in n. | |
| 905 * It is the callers responsibility to: | |
| 906 * a> check the value of n, and n may be 0. | |
| 907 * b> ignore any empty path elements | |
| 908 * c> free up the data. | |
| 909 */ | |
| 910 char** os::split_path(const char* path, int* n) { | |
| 911 *n = 0; | |
| 912 if (path == NULL || strlen(path) == 0) { | |
| 913 return NULL; | |
| 914 } | |
| 915 const char psepchar = *os::path_separator(); | |
| 916 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1); | |
| 917 if (inpath == NULL) { | |
| 918 return NULL; | |
| 919 } | |
| 920 strncpy(inpath, path, strlen(path)); | |
| 921 int count = 1; | |
| 922 char* p = strchr(inpath, psepchar); | |
| 923 // Get a count of elements to allocate memory | |
| 924 while (p != NULL) { | |
| 925 count++; | |
| 926 p++; | |
| 927 p = strchr(p, psepchar); | |
| 928 } | |
| 929 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count); | |
| 930 if (opath == NULL) { | |
| 931 return NULL; | |
| 932 } | |
| 933 | |
| 934 // do the actual splitting | |
| 935 p = inpath; | |
| 936 for (int i = 0 ; i < count ; i++) { | |
| 937 size_t len = strcspn(p, os::path_separator()); | |
| 938 if (len > JVM_MAXPATHLEN) { | |
| 939 return NULL; | |
| 940 } | |
| 941 // allocate the string and add terminator storage | |
| 942 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1); | |
| 943 if (s == NULL) { | |
| 944 return NULL; | |
| 945 } | |
| 946 strncpy(s, p, len); | |
| 947 s[len] = '\0'; | |
| 948 opath[i] = s; | |
| 949 p += len + 1; | |
| 950 } | |
| 951 FREE_C_HEAP_ARRAY(char, inpath); | |
| 952 *n = count; | |
| 953 return opath; | |
| 954 } | |
| 955 | |
| 0 | 956 void os::set_memory_serialize_page(address page) { |
| 957 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
| 958 _mem_serialize_page = (volatile int32_t *)page; | |
| 959 // We initialize the serialization page shift count here | |
| 960 // We assume a cache line size of 64 bytes | |
| 961 assert(SerializePageShiftCount == count, | |
| 962 "thread size changed, fix SerializePageShiftCount constant"); | |
| 963 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
| 964 } | |
| 965 | |
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966 static volatile intptr_t SerializePageLock = 0; |
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967 |
| 0 | 968 // This method is called from signal handler when SIGSEGV occurs while the current |
| 969 // thread tries to store to the "read-only" memory serialize page during state | |
| 970 // transition. | |
| 971 void os::block_on_serialize_page_trap() { | |
| 972 if (TraceSafepoint) { | |
| 973 tty->print_cr("Block until the serialize page permission restored"); | |
| 974 } | |
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975 // When VMThread is holding the SerializePageLock during modifying the |
| 0 | 976 // access permission of the memory serialize page, the following call |
| 977 // will block until the permission of that page is restored to rw. | |
| 978 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
| 979 // this case, it's OK as the signal is synchronous and we know precisely when | |
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980 // it can occur. |
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981 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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982 Thread::muxRelease(&SerializePageLock); |
| 0 | 983 } |
| 984 | |
| 985 // Serialize all thread state variables | |
| 986 void os::serialize_thread_states() { | |
| 987 // On some platforms such as Solaris & Linux, the time duration of the page | |
| 988 // permission restoration is observed to be much longer than expected due to | |
| 989 // scheduler starvation problem etc. To avoid the long synchronization | |
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990 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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991 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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992 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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993 os::protect_memory((char *)os::get_memory_serialize_page(), |
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994 os::vm_page_size(), MEM_PROT_READ); |
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995 os::protect_memory((char *)os::get_memory_serialize_page(), |
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996 os::vm_page_size(), MEM_PROT_RW); |
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997 Thread::muxRelease(&SerializePageLock); |
| 0 | 998 } |
| 999 | |
| 1000 // Returns true if the current stack pointer is above the stack shadow | |
| 1001 // pages, false otherwise. | |
| 1002 | |
| 1003 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
| 1004 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
| 1005 address sp = current_stack_pointer(); | |
| 1006 // Check if we have StackShadowPages above the yellow zone. This parameter | |
| 605 | 1007 // is dependent on the depth of the maximum VM call stack possible from |
| 0 | 1008 // the handler for stack overflow. 'instanceof' in the stack overflow |
| 1009 // handler or a println uses at least 8k stack of VM and native code | |
| 1010 // respectively. | |
| 1011 const int framesize_in_bytes = | |
| 1012 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
| 1013 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
| 1014 * vm_page_size()) + framesize_in_bytes; | |
| 1015 // The very lower end of the stack | |
| 1016 address stack_limit = thread->stack_base() - thread->stack_size(); | |
| 1017 return (sp > (stack_limit + reserved_area)); | |
| 1018 } | |
| 1019 | |
| 1020 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
| 1021 uint min_pages) | |
| 1022 { | |
| 1023 assert(min_pages > 0, "sanity"); | |
| 1024 if (UseLargePages) { | |
| 1025 const size_t max_page_size = region_max_size / min_pages; | |
| 1026 | |
| 1027 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
| 1028 const size_t sz = _page_sizes[i]; | |
| 1029 const size_t mask = sz - 1; | |
| 1030 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
| 1031 // The largest page size with no fragmentation. | |
| 1032 return sz; | |
| 1033 } | |
| 1034 | |
| 1035 if (sz <= max_page_size) { | |
| 1036 // The largest page size that satisfies the min_pages requirement. | |
| 1037 return sz; | |
| 1038 } | |
| 1039 } | |
| 1040 } | |
| 1041 | |
| 1042 return vm_page_size(); | |
| 1043 } | |
| 1044 | |
| 1045 #ifndef PRODUCT | |
| 1046 void os::trace_page_sizes(const char* str, const size_t region_min_size, | |
| 1047 const size_t region_max_size, const size_t page_size, | |
| 1048 const char* base, const size_t size) | |
| 1049 { | |
| 1050 if (TracePageSizes) { | |
| 1051 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
| 1052 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
| 1053 " size=" SIZE_FORMAT, | |
| 1054 str, region_min_size, region_max_size, | |
| 1055 page_size, base, size); | |
| 1056 } | |
| 1057 } | |
| 1058 #endif // #ifndef PRODUCT | |
| 1059 | |
| 1060 // This is the working definition of a server class machine: | |
| 1061 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
| 1062 // because the graphics memory (?) sometimes masks physical memory. | |
| 1063 // If you want to change the definition of a server class machine | |
| 1064 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
| 1065 // then you'll have to parameterize this method based on that state, | |
| 1066 // as was done for logical processors here, or replicate and | |
| 1067 // specialize this method for each platform. (Or fix os to have | |
| 1068 // some inheritance structure and use subclassing. Sigh.) | |
| 1069 // If you want some platform to always or never behave as a server | |
| 1070 // class machine, change the setting of AlwaysActAsServerClassMachine | |
| 1071 // and NeverActAsServerClassMachine in globals*.hpp. | |
| 1072 bool os::is_server_class_machine() { | |
| 1073 // First check for the early returns | |
| 1074 if (NeverActAsServerClassMachine) { | |
| 1075 return false; | |
| 1076 } | |
| 1077 if (AlwaysActAsServerClassMachine) { | |
| 1078 return true; | |
| 1079 } | |
| 1080 // Then actually look at the machine | |
| 1081 bool result = false; | |
| 1082 const unsigned int server_processors = 2; | |
| 1083 const julong server_memory = 2UL * G; | |
| 1084 // We seem not to get our full complement of memory. | |
| 1085 // We allow some part (1/8?) of the memory to be "missing", | |
| 1086 // based on the sizes of DIMMs, and maybe graphics cards. | |
| 1087 const julong missing_memory = 256UL * M; | |
| 1088 | |
| 1089 /* Is this a server class machine? */ | |
| 1090 if ((os::active_processor_count() >= (int)server_processors) && | |
| 1091 (os::physical_memory() >= (server_memory - missing_memory))) { | |
| 1092 const unsigned int logical_processors = | |
| 1093 VM_Version::logical_processors_per_package(); | |
| 1094 if (logical_processors > 1) { | |
| 1095 const unsigned int physical_packages = | |
| 1096 os::active_processor_count() / logical_processors; | |
| 1097 if (physical_packages > server_processors) { | |
| 1098 result = true; | |
| 1099 } | |
| 1100 } else { | |
| 1101 result = true; | |
| 1102 } | |
| 1103 } | |
| 1104 return result; | |
| 1105 } |