Mercurial > hg > truffle
annotate src/share/vm/runtime/os.cpp @ 3859:24cee90e9453
6791672: enable 1G and larger pages on solaris
Reviewed-by: ysr, iveresov, johnc
| author | jcoomes |
|---|---|
| date | Wed, 17 Aug 2011 10:32:53 -0700 |
| parents | bf6481e5f96d |
| children | 9f12ede5571a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2250 | 2 * Copyright (c) 1997, 2011, 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" | |
| 47 #include "services/attachListener.hpp" | |
| 48 #include "services/threadService.hpp" | |
| 49 #include "utilities/defaultStream.hpp" | |
| 50 #include "utilities/events.hpp" | |
| 51 #ifdef TARGET_OS_FAMILY_linux | |
| 52 # include "os_linux.inline.hpp" | |
| 53 # include "thread_linux.inline.hpp" | |
| 54 #endif | |
| 55 #ifdef TARGET_OS_FAMILY_solaris | |
| 56 # include "os_solaris.inline.hpp" | |
| 57 # include "thread_solaris.inline.hpp" | |
| 58 #endif | |
| 59 #ifdef TARGET_OS_FAMILY_windows | |
| 60 # include "os_windows.inline.hpp" | |
| 61 # include "thread_windows.inline.hpp" | |
| 62 #endif | |
| 0 | 63 |
| 64 # include <signal.h> | |
| 65 | |
| 66 OSThread* os::_starting_thread = NULL; | |
| 67 address os::_polling_page = NULL; | |
| 68 volatile int32_t* os::_mem_serialize_page = NULL; | |
| 69 uintptr_t os::_serialize_page_mask = 0; | |
| 70 long os::_rand_seed = 1; | |
| 71 int os::_processor_count = 0; | |
| 72 size_t os::_page_sizes[os::page_sizes_max]; | |
| 73 | |
| 74 #ifndef PRODUCT | |
| 2250 | 75 julong os::num_mallocs = 0; // # of calls to malloc/realloc |
| 76 julong os::alloc_bytes = 0; // # of bytes allocated | |
| 77 julong os::num_frees = 0; // # of calls to free | |
| 78 julong os::free_bytes = 0; // # of bytes freed | |
| 0 | 79 #endif |
| 80 | |
| 81 // Fill in buffer with current local time as an ISO-8601 string. | |
| 82 // E.g., yyyy-mm-ddThh:mm:ss-zzzz. | |
| 83 // Returns buffer, or NULL if it failed. | |
| 84 // This would mostly be a call to | |
| 85 // strftime(...., "%Y-%m-%d" "T" "%H:%M:%S" "%z", ....) | |
| 86 // except that on Windows the %z behaves badly, so we do it ourselves. | |
| 87 // Also, people wanted milliseconds on there, | |
| 88 // and strftime doesn't do milliseconds. | |
| 89 char* os::iso8601_time(char* buffer, size_t buffer_length) { | |
| 90 // Output will be of the form "YYYY-MM-DDThh:mm:ss.mmm+zzzz\0" | |
| 91 // 1 2 | |
| 92 // 12345678901234567890123456789 | |
| 93 static const char* iso8601_format = | |
| 94 "%04d-%02d-%02dT%02d:%02d:%02d.%03d%c%02d%02d"; | |
| 95 static const size_t needed_buffer = 29; | |
| 96 | |
| 97 // Sanity check the arguments | |
| 98 if (buffer == NULL) { | |
| 99 assert(false, "NULL buffer"); | |
| 100 return NULL; | |
| 101 } | |
| 102 if (buffer_length < needed_buffer) { | |
| 103 assert(false, "buffer_length too small"); | |
| 104 return NULL; | |
| 105 } | |
| 106 // Get the current time | |
| 61 | 107 jlong milliseconds_since_19700101 = javaTimeMillis(); |
| 0 | 108 const int milliseconds_per_microsecond = 1000; |
| 109 const time_t seconds_since_19700101 = | |
| 110 milliseconds_since_19700101 / milliseconds_per_microsecond; | |
| 111 const int milliseconds_after_second = | |
| 112 milliseconds_since_19700101 % milliseconds_per_microsecond; | |
| 113 // Convert the time value to a tm and timezone variable | |
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114 struct tm time_struct; |
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115 if (localtime_pd(&seconds_since_19700101, &time_struct) == NULL) { |
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116 assert(false, "Failed localtime_pd"); |
| 0 | 117 return NULL; |
| 118 } | |
| 119 const time_t zone = timezone; | |
| 120 | |
| 121 // If daylight savings time is in effect, | |
| 122 // we are 1 hour East of our time zone | |
| 123 const time_t seconds_per_minute = 60; | |
| 124 const time_t minutes_per_hour = 60; | |
| 125 const time_t seconds_per_hour = seconds_per_minute * minutes_per_hour; | |
| 126 time_t UTC_to_local = zone; | |
| 127 if (time_struct.tm_isdst > 0) { | |
| 128 UTC_to_local = UTC_to_local - seconds_per_hour; | |
| 129 } | |
| 130 // Compute the time zone offset. | |
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131 // localtime_pd() sets timezone to the difference (in seconds) |
| 0 | 132 // between UTC and and local time. |
| 133 // ISO 8601 says we need the difference between local time and UTC, | |
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134 // we change the sign of the localtime_pd() result. |
| 0 | 135 const time_t local_to_UTC = -(UTC_to_local); |
| 136 // Then we have to figure out if if we are ahead (+) or behind (-) UTC. | |
| 137 char sign_local_to_UTC = '+'; | |
| 138 time_t abs_local_to_UTC = local_to_UTC; | |
| 139 if (local_to_UTC < 0) { | |
| 140 sign_local_to_UTC = '-'; | |
| 141 abs_local_to_UTC = -(abs_local_to_UTC); | |
| 142 } | |
| 143 // Convert time zone offset seconds to hours and minutes. | |
| 144 const time_t zone_hours = (abs_local_to_UTC / seconds_per_hour); | |
| 145 const time_t zone_min = | |
| 146 ((abs_local_to_UTC % seconds_per_hour) / seconds_per_minute); | |
| 147 | |
| 148 // Print an ISO 8601 date and time stamp into the buffer | |
| 149 const int year = 1900 + time_struct.tm_year; | |
| 150 const int month = 1 + time_struct.tm_mon; | |
| 151 const int printed = jio_snprintf(buffer, buffer_length, iso8601_format, | |
| 152 year, | |
| 153 month, | |
| 154 time_struct.tm_mday, | |
| 155 time_struct.tm_hour, | |
| 156 time_struct.tm_min, | |
| 157 time_struct.tm_sec, | |
| 158 milliseconds_after_second, | |
| 159 sign_local_to_UTC, | |
| 160 zone_hours, | |
| 161 zone_min); | |
| 162 if (printed == 0) { | |
| 163 assert(false, "Failed jio_printf"); | |
| 164 return NULL; | |
| 165 } | |
| 166 return buffer; | |
| 167 } | |
| 168 | |
| 169 OSReturn os::set_priority(Thread* thread, ThreadPriority p) { | |
| 170 #ifdef ASSERT | |
| 171 if (!(!thread->is_Java_thread() || | |
| 172 Thread::current() == thread || | |
| 173 Threads_lock->owned_by_self() | |
| 174 || thread->is_Compiler_thread() | |
| 175 )) { | |
| 176 assert(false, "possibility of dangling Thread pointer"); | |
| 177 } | |
| 178 #endif | |
| 179 | |
| 180 if (p >= MinPriority && p <= MaxPriority) { | |
| 181 int priority = java_to_os_priority[p]; | |
| 182 return set_native_priority(thread, priority); | |
| 183 } else { | |
| 184 assert(false, "Should not happen"); | |
| 185 return OS_ERR; | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 | |
| 190 OSReturn os::get_priority(const Thread* const thread, ThreadPriority& priority) { | |
| 191 int p; | |
| 192 int os_prio; | |
| 193 OSReturn ret = get_native_priority(thread, &os_prio); | |
| 194 if (ret != OS_OK) return ret; | |
| 195 | |
| 196 for (p = MaxPriority; p > MinPriority && java_to_os_priority[p] > os_prio; p--) ; | |
| 197 priority = (ThreadPriority)p; | |
| 198 return OS_OK; | |
| 199 } | |
| 200 | |
| 201 | |
| 202 // --------------------- sun.misc.Signal (optional) --------------------- | |
| 203 | |
| 204 | |
| 205 // SIGBREAK is sent by the keyboard to query the VM state | |
| 206 #ifndef SIGBREAK | |
| 207 #define SIGBREAK SIGQUIT | |
| 208 #endif | |
| 209 | |
| 210 // sigexitnum_pd is a platform-specific special signal used for terminating the Signal thread. | |
| 211 | |
| 212 | |
| 213 static void signal_thread_entry(JavaThread* thread, TRAPS) { | |
| 214 os::set_priority(thread, NearMaxPriority); | |
| 215 while (true) { | |
| 216 int sig; | |
| 217 { | |
| 218 // FIXME : Currently we have not decieded what should be the status | |
| 219 // for this java thread blocked here. Once we decide about | |
| 220 // that we should fix this. | |
| 221 sig = os::signal_wait(); | |
| 222 } | |
| 223 if (sig == os::sigexitnum_pd()) { | |
| 224 // Terminate the signal thread | |
| 225 return; | |
| 226 } | |
| 227 | |
| 228 switch (sig) { | |
| 229 case SIGBREAK: { | |
| 230 // Check if the signal is a trigger to start the Attach Listener - in that | |
| 231 // case don't print stack traces. | |
| 232 if (!DisableAttachMechanism && AttachListener::is_init_trigger()) { | |
| 233 continue; | |
| 234 } | |
| 235 // Print stack traces | |
| 236 // Any SIGBREAK operations added here should make sure to flush | |
| 237 // the output stream (e.g. tty->flush()) after output. See 4803766. | |
| 238 // Each module also prints an extra carriage return after its output. | |
| 239 VM_PrintThreads op; | |
| 240 VMThread::execute(&op); | |
| 241 VM_PrintJNI jni_op; | |
| 242 VMThread::execute(&jni_op); | |
| 243 VM_FindDeadlocks op1(tty); | |
| 244 VMThread::execute(&op1); | |
| 245 Universe::print_heap_at_SIGBREAK(); | |
| 246 if (PrintClassHistogram) { | |
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247 VM_GC_HeapInspection op1(gclog_or_tty, true /* force full GC before heap inspection */, |
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248 true /* need_prologue */); |
| 0 | 249 VMThread::execute(&op1); |
| 250 } | |
| 251 if (JvmtiExport::should_post_data_dump()) { | |
| 252 JvmtiExport::post_data_dump(); | |
| 253 } | |
| 254 break; | |
| 255 } | |
| 256 default: { | |
| 257 // Dispatch the signal to java | |
| 258 HandleMark hm(THREAD); | |
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259 klassOop k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_Signal(), THREAD); |
| 0 | 260 KlassHandle klass (THREAD, k); |
| 261 if (klass.not_null()) { | |
| 262 JavaValue result(T_VOID); | |
| 263 JavaCallArguments args; | |
| 264 args.push_int(sig); | |
| 265 JavaCalls::call_static( | |
| 266 &result, | |
| 267 klass, | |
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268 vmSymbols::dispatch_name(), |
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269 vmSymbols::int_void_signature(), |
| 0 | 270 &args, |
| 271 THREAD | |
| 272 ); | |
| 273 } | |
| 274 if (HAS_PENDING_EXCEPTION) { | |
| 275 // tty is initialized early so we don't expect it to be null, but | |
| 276 // if it is we can't risk doing an initialization that might | |
| 277 // trigger additional out-of-memory conditions | |
| 278 if (tty != NULL) { | |
| 279 char klass_name[256]; | |
| 280 char tmp_sig_name[16]; | |
| 281 const char* sig_name = "UNKNOWN"; | |
| 282 instanceKlass::cast(PENDING_EXCEPTION->klass())-> | |
| 283 name()->as_klass_external_name(klass_name, 256); | |
| 284 if (os::exception_name(sig, tmp_sig_name, 16) != NULL) | |
| 285 sig_name = tmp_sig_name; | |
| 286 warning("Exception %s occurred dispatching signal %s to handler" | |
| 287 "- the VM may need to be forcibly terminated", | |
| 288 klass_name, sig_name ); | |
| 289 } | |
| 290 CLEAR_PENDING_EXCEPTION; | |
| 291 } | |
| 292 } | |
| 293 } | |
| 294 } | |
| 295 } | |
| 296 | |
| 297 | |
| 298 void os::signal_init() { | |
| 299 if (!ReduceSignalUsage) { | |
| 300 // Setup JavaThread for processing signals | |
| 301 EXCEPTION_MARK; | |
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302 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
| 0 | 303 instanceKlassHandle klass (THREAD, k); |
| 304 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 305 | |
| 306 const char thread_name[] = "Signal Dispatcher"; | |
| 307 Handle string = java_lang_String::create_from_str(thread_name, CHECK); | |
| 308 | |
| 309 // Initialize thread_oop to put it into the system threadGroup | |
| 310 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 311 JavaValue result(T_VOID); | |
| 312 JavaCalls::call_special(&result, thread_oop, | |
| 313 klass, | |
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314 vmSymbols::object_initializer_name(), |
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315 vmSymbols::threadgroup_string_void_signature(), |
| 0 | 316 thread_group, |
| 317 string, | |
| 318 CHECK); | |
| 319 | |
| 1142 | 320 KlassHandle group(THREAD, SystemDictionary::ThreadGroup_klass()); |
| 0 | 321 JavaCalls::call_special(&result, |
| 322 thread_group, | |
| 323 group, | |
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324 vmSymbols::add_method_name(), |
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325 vmSymbols::thread_void_signature(), |
| 0 | 326 thread_oop, // ARG 1 |
| 327 CHECK); | |
| 328 | |
| 329 os::signal_init_pd(); | |
| 330 | |
| 331 { MutexLocker mu(Threads_lock); | |
| 332 JavaThread* signal_thread = new JavaThread(&signal_thread_entry); | |
| 333 | |
| 334 // At this point it may be possible that no osthread was created for the | |
| 335 // JavaThread due to lack of memory. We would have to throw an exception | |
| 336 // in that case. However, since this must work and we do not allow | |
| 337 // exceptions anyway, check and abort if this fails. | |
| 338 if (signal_thread == NULL || signal_thread->osthread() == NULL) { | |
| 339 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 340 "unable to create new native thread"); | |
| 341 } | |
| 342 | |
| 343 java_lang_Thread::set_thread(thread_oop(), signal_thread); | |
| 344 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 345 java_lang_Thread::set_daemon(thread_oop()); | |
| 346 | |
| 347 signal_thread->set_threadObj(thread_oop()); | |
| 348 Threads::add(signal_thread); | |
| 349 Thread::start(signal_thread); | |
| 350 } | |
| 351 // Handle ^BREAK | |
| 352 os::signal(SIGBREAK, os::user_handler()); | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 | |
| 357 void os::terminate_signal_thread() { | |
| 358 if (!ReduceSignalUsage) | |
| 359 signal_notify(sigexitnum_pd()); | |
| 360 } | |
| 361 | |
| 362 | |
| 363 // --------------------- loading libraries --------------------- | |
| 364 | |
| 365 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); | |
| 366 extern struct JavaVM_ main_vm; | |
| 367 | |
| 368 static void* _native_java_library = NULL; | |
| 369 | |
| 370 void* os::native_java_library() { | |
| 371 if (_native_java_library == NULL) { | |
| 372 char buffer[JVM_MAXPATHLEN]; | |
| 373 char ebuf[1024]; | |
| 374 | |
| 242 | 375 // Try to load verify dll first. In 1.3 java dll depends on it and is not |
| 376 // always able to find it when the loading executable is outside the JDK. | |
| 0 | 377 // In order to keep working with 1.2 we ignore any loading errors. |
| 242 | 378 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "verify"); |
| 379 dll_load(buffer, ebuf, sizeof(ebuf)); | |
| 0 | 380 |
| 381 // Load java dll | |
| 242 | 382 dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), "java"); |
| 383 _native_java_library = dll_load(buffer, ebuf, sizeof(ebuf)); | |
| 0 | 384 if (_native_java_library == NULL) { |
| 385 vm_exit_during_initialization("Unable to load native library", ebuf); | |
| 386 } | |
| 242 | 387 } |
| 388 static jboolean onLoaded = JNI_FALSE; | |
| 389 if (onLoaded) { | |
| 390 // We may have to wait to fire OnLoad until TLS is initialized. | |
| 391 if (ThreadLocalStorage::is_initialized()) { | |
| 392 // The JNI_OnLoad handling is normally done by method load in | |
| 393 // java.lang.ClassLoader$NativeLibrary, but the VM loads the base library | |
| 394 // explicitly so we have to check for JNI_OnLoad as well | |
| 395 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; | |
| 396 JNI_OnLoad_t JNI_OnLoad = CAST_TO_FN_PTR( | |
| 397 JNI_OnLoad_t, dll_lookup(_native_java_library, onLoadSymbols[0])); | |
| 398 if (JNI_OnLoad != NULL) { | |
| 399 JavaThread* thread = JavaThread::current(); | |
| 400 ThreadToNativeFromVM ttn(thread); | |
| 401 HandleMark hm(thread); | |
| 402 jint ver = (*JNI_OnLoad)(&main_vm, NULL); | |
| 403 onLoaded = JNI_TRUE; | |
| 404 if (!Threads::is_supported_jni_version_including_1_1(ver)) { | |
| 405 vm_exit_during_initialization("Unsupported JNI version"); | |
| 406 } | |
| 0 | 407 } |
| 408 } | |
| 409 } | |
| 410 return _native_java_library; | |
| 411 } | |
| 412 | |
| 413 // --------------------- heap allocation utilities --------------------- | |
| 414 | |
| 415 char *os::strdup(const char *str) { | |
| 416 size_t size = strlen(str); | |
| 417 char *dup_str = (char *)malloc(size + 1); | |
| 418 if (dup_str == NULL) return NULL; | |
| 419 strcpy(dup_str, str); | |
| 420 return dup_str; | |
| 421 } | |
| 422 | |
| 423 | |
| 424 | |
| 425 #ifdef ASSERT | |
| 426 #define space_before (MallocCushion + sizeof(double)) | |
| 427 #define space_after MallocCushion | |
| 428 #define size_addr_from_base(p) (size_t*)(p + space_before - sizeof(size_t)) | |
| 429 #define size_addr_from_obj(p) ((size_t*)p - 1) | |
| 430 // MallocCushion: size of extra cushion allocated around objects with +UseMallocOnly | |
| 431 // NB: cannot be debug variable, because these aren't set from the command line until | |
| 432 // *after* the first few allocs already happened | |
| 433 #define MallocCushion 16 | |
| 434 #else | |
| 435 #define space_before 0 | |
| 436 #define space_after 0 | |
| 437 #define size_addr_from_base(p) should not use w/o ASSERT | |
| 438 #define size_addr_from_obj(p) should not use w/o ASSERT | |
| 439 #define MallocCushion 0 | |
| 440 #endif | |
| 441 #define paranoid 0 /* only set to 1 if you suspect checking code has bug */ | |
| 442 | |
| 443 #ifdef ASSERT | |
| 444 inline size_t get_size(void* obj) { | |
| 445 size_t size = *size_addr_from_obj(obj); | |
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446 if (size < 0) { |
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447 fatal(err_msg("free: size field of object #" PTR_FORMAT " was overwritten (" |
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448 SIZE_FORMAT ")", obj, size)); |
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449 } |
| 0 | 450 return size; |
| 451 } | |
| 452 | |
| 453 u_char* find_cushion_backwards(u_char* start) { | |
| 454 u_char* p = start; | |
| 455 while (p[ 0] != badResourceValue || p[-1] != badResourceValue || | |
| 456 p[-2] != badResourceValue || p[-3] != badResourceValue) p--; | |
| 457 // ok, we have four consecutive marker bytes; find start | |
| 458 u_char* q = p - 4; | |
| 459 while (*q == badResourceValue) q--; | |
| 460 return q + 1; | |
| 461 } | |
| 462 | |
| 463 u_char* find_cushion_forwards(u_char* start) { | |
| 464 u_char* p = start; | |
| 465 while (p[0] != badResourceValue || p[1] != badResourceValue || | |
| 466 p[2] != badResourceValue || p[3] != badResourceValue) p++; | |
| 467 // ok, we have four consecutive marker bytes; find end of cushion | |
| 468 u_char* q = p + 4; | |
| 469 while (*q == badResourceValue) q++; | |
| 470 return q - MallocCushion; | |
| 471 } | |
| 472 | |
| 473 void print_neighbor_blocks(void* ptr) { | |
| 474 // find block allocated before ptr (not entirely crash-proof) | |
| 475 if (MallocCushion < 4) { | |
| 476 tty->print_cr("### cannot find previous block (MallocCushion < 4)"); | |
| 477 return; | |
| 478 } | |
| 479 u_char* start_of_this_block = (u_char*)ptr - space_before; | |
| 480 u_char* end_of_prev_block_data = start_of_this_block - space_after -1; | |
| 481 // look for cushion in front of prev. block | |
| 482 u_char* start_of_prev_block = find_cushion_backwards(end_of_prev_block_data); | |
| 483 ptrdiff_t size = *size_addr_from_base(start_of_prev_block); | |
| 484 u_char* obj = start_of_prev_block + space_before; | |
| 485 if (size <= 0 ) { | |
| 486 // start is bad; mayhave been confused by OS data inbetween objects | |
| 487 // search one more backwards | |
| 488 start_of_prev_block = find_cushion_backwards(start_of_prev_block); | |
| 489 size = *size_addr_from_base(start_of_prev_block); | |
| 490 obj = start_of_prev_block + space_before; | |
| 491 } | |
| 492 | |
| 493 if (start_of_prev_block + space_before + size + space_after == start_of_this_block) { | |
| 2250 | 494 tty->print_cr("### previous object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
| 0 | 495 } else { |
| 2250 | 496 tty->print_cr("### previous object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", obj, size); |
| 0 | 497 } |
| 498 | |
| 499 // now find successor block | |
| 500 u_char* start_of_next_block = (u_char*)ptr + *size_addr_from_obj(ptr) + space_after; | |
| 501 start_of_next_block = find_cushion_forwards(start_of_next_block); | |
| 502 u_char* next_obj = start_of_next_block + space_before; | |
| 503 ptrdiff_t next_size = *size_addr_from_base(start_of_next_block); | |
| 504 if (start_of_next_block[0] == badResourceValue && | |
| 505 start_of_next_block[1] == badResourceValue && | |
| 506 start_of_next_block[2] == badResourceValue && | |
| 507 start_of_next_block[3] == badResourceValue) { | |
| 2250 | 508 tty->print_cr("### next object: " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
| 0 | 509 } else { |
| 2250 | 510 tty->print_cr("### next object (not sure if correct): " PTR_FORMAT " (" SSIZE_FORMAT " bytes)", next_obj, next_size); |
| 0 | 511 } |
| 512 } | |
| 513 | |
| 514 | |
| 515 void report_heap_error(void* memblock, void* bad, const char* where) { | |
| 2250 | 516 tty->print_cr("## nof_mallocs = " UINT64_FORMAT ", nof_frees = " UINT64_FORMAT, os::num_mallocs, os::num_frees); |
| 517 tty->print_cr("## memory stomp: byte at " PTR_FORMAT " %s object " PTR_FORMAT, bad, where, memblock); | |
| 0 | 518 print_neighbor_blocks(memblock); |
| 519 fatal("memory stomping error"); | |
| 520 } | |
| 521 | |
| 522 void verify_block(void* memblock) { | |
| 523 size_t size = get_size(memblock); | |
| 524 if (MallocCushion) { | |
| 525 u_char* ptr = (u_char*)memblock - space_before; | |
| 526 for (int i = 0; i < MallocCushion; i++) { | |
| 527 if (ptr[i] != badResourceValue) { | |
| 528 report_heap_error(memblock, ptr+i, "in front of"); | |
| 529 } | |
| 530 } | |
| 531 u_char* end = (u_char*)memblock + size + space_after; | |
| 532 for (int j = -MallocCushion; j < 0; j++) { | |
| 533 if (end[j] != badResourceValue) { | |
| 534 report_heap_error(memblock, end+j, "after"); | |
| 535 } | |
| 536 } | |
| 537 } | |
| 538 } | |
| 539 #endif | |
| 540 | |
| 541 void* os::malloc(size_t size) { | |
| 2250 | 542 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
| 543 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
| 0 | 544 |
| 545 if (size == 0) { | |
| 546 // return a valid pointer if size is zero | |
| 547 // if NULL is returned the calling functions assume out of memory. | |
| 548 size = 1; | |
| 549 } | |
| 550 | |
| 551 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 552 u_char* ptr = (u_char*)::malloc(size + space_before + space_after); | |
| 553 #ifdef ASSERT | |
| 554 if (ptr == NULL) return NULL; | |
| 555 if (MallocCushion) { | |
| 556 for (u_char* p = ptr; p < ptr + MallocCushion; p++) *p = (u_char)badResourceValue; | |
| 557 u_char* end = ptr + space_before + size; | |
| 558 for (u_char* pq = ptr+MallocCushion; pq < end; pq++) *pq = (u_char)uninitBlockPad; | |
| 559 for (u_char* q = end; q < end + MallocCushion; q++) *q = (u_char)badResourceValue; | |
| 560 } | |
| 561 // put size just before data | |
| 562 *size_addr_from_base(ptr) = size; | |
| 563 #endif | |
| 564 u_char* memblock = ptr + space_before; | |
| 565 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 566 tty->print_cr("os::malloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
| 0 | 567 breakpoint(); |
| 568 } | |
| 569 debug_only(if (paranoid) verify_block(memblock)); | |
| 2250 | 570 if (PrintMalloc && tty != NULL) tty->print_cr("os::malloc " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, memblock); |
| 0 | 571 return memblock; |
| 572 } | |
| 573 | |
| 574 | |
| 575 void* os::realloc(void *memblock, size_t size) { | |
| 576 #ifndef ASSERT | |
| 2250 | 577 NOT_PRODUCT(inc_stat_counter(&num_mallocs, 1)); |
| 578 NOT_PRODUCT(inc_stat_counter(&alloc_bytes, size)); | |
| 0 | 579 return ::realloc(memblock, size); |
| 580 #else | |
| 581 if (memblock == NULL) { | |
| 2250 | 582 return malloc(size); |
| 0 | 583 } |
| 584 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 585 tty->print_cr("os::realloc caught " PTR_FORMAT, memblock); |
| 0 | 586 breakpoint(); |
| 587 } | |
| 588 verify_block(memblock); | |
| 589 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 590 if (size == 0) return NULL; | |
| 591 // always move the block | |
| 592 void* ptr = malloc(size); | |
| 2250 | 593 if (PrintMalloc) tty->print_cr("os::remalloc " SIZE_FORMAT " bytes, " PTR_FORMAT " --> " PTR_FORMAT, size, memblock, ptr); |
| 0 | 594 // Copy to new memory if malloc didn't fail |
| 595 if ( ptr != NULL ) { | |
| 596 memcpy(ptr, memblock, MIN2(size, get_size(memblock))); | |
| 597 if (paranoid) verify_block(ptr); | |
| 598 if ((intptr_t)ptr == (intptr_t)MallocCatchPtr) { | |
| 2250 | 599 tty->print_cr("os::realloc caught, " SIZE_FORMAT " bytes --> " PTR_FORMAT, size, ptr); |
| 0 | 600 breakpoint(); |
| 601 } | |
| 602 free(memblock); | |
| 603 } | |
| 604 return ptr; | |
| 605 #endif | |
| 606 } | |
| 607 | |
| 608 | |
| 609 void os::free(void *memblock) { | |
| 2250 | 610 NOT_PRODUCT(inc_stat_counter(&num_frees, 1)); |
| 0 | 611 #ifdef ASSERT |
| 612 if (memblock == NULL) return; | |
| 613 if ((intptr_t)memblock == (intptr_t)MallocCatchPtr) { | |
| 2250 | 614 if (tty != NULL) tty->print_cr("os::free caught " PTR_FORMAT, memblock); |
| 0 | 615 breakpoint(); |
| 616 } | |
| 617 verify_block(memblock); | |
| 618 NOT_PRODUCT(if (MallocVerifyInterval > 0) check_heap()); | |
| 619 // Added by detlefs. | |
| 620 if (MallocCushion) { | |
| 621 u_char* ptr = (u_char*)memblock - space_before; | |
| 622 for (u_char* p = ptr; p < ptr + MallocCushion; p++) { | |
| 623 guarantee(*p == badResourceValue, | |
| 624 "Thing freed should be malloc result."); | |
| 625 *p = (u_char)freeBlockPad; | |
| 626 } | |
| 627 size_t size = get_size(memblock); | |
| 2250 | 628 inc_stat_counter(&free_bytes, size); |
| 0 | 629 u_char* end = ptr + space_before + size; |
| 630 for (u_char* q = end; q < end + MallocCushion; q++) { | |
| 631 guarantee(*q == badResourceValue, | |
| 632 "Thing freed should be malloc result."); | |
| 633 *q = (u_char)freeBlockPad; | |
| 634 } | |
| 2250 | 635 if (PrintMalloc && tty != NULL) |
|
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636 fprintf(stderr, "os::free " SIZE_FORMAT " bytes --> " PTR_FORMAT "\n", size, (uintptr_t)memblock); |
| 2250 | 637 } else if (PrintMalloc && tty != NULL) { |
| 638 // tty->print_cr("os::free %p", memblock); | |
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639 fprintf(stderr, "os::free " PTR_FORMAT "\n", (uintptr_t)memblock); |
| 0 | 640 } |
| 641 #endif | |
| 642 ::free((char*)memblock - space_before); | |
| 643 } | |
| 644 | |
| 645 void os::init_random(long initval) { | |
| 646 _rand_seed = initval; | |
| 647 } | |
| 648 | |
| 649 | |
| 650 long os::random() { | |
| 651 /* standard, well-known linear congruential random generator with | |
| 652 * next_rand = (16807*seed) mod (2**31-1) | |
| 653 * see | |
| 654 * (1) "Random Number Generators: Good Ones Are Hard to Find", | |
| 655 * S.K. Park and K.W. Miller, Communications of the ACM 31:10 (Oct 1988), | |
| 656 * (2) "Two Fast Implementations of the 'Minimal Standard' Random | |
| 657 * Number Generator", David G. Carta, Comm. ACM 33, 1 (Jan 1990), pp. 87-88. | |
| 658 */ | |
| 659 const long a = 16807; | |
| 660 const unsigned long m = 2147483647; | |
| 661 const long q = m / a; assert(q == 127773, "weird math"); | |
| 662 const long r = m % a; assert(r == 2836, "weird math"); | |
| 663 | |
| 664 // compute az=2^31p+q | |
| 665 unsigned long lo = a * (long)(_rand_seed & 0xFFFF); | |
| 666 unsigned long hi = a * (long)((unsigned long)_rand_seed >> 16); | |
| 667 lo += (hi & 0x7FFF) << 16; | |
| 668 | |
| 669 // if q overflowed, ignore the overflow and increment q | |
| 670 if (lo > m) { | |
| 671 lo &= m; | |
| 672 ++lo; | |
| 673 } | |
| 674 lo += hi >> 15; | |
| 675 | |
| 676 // if (p+q) overflowed, ignore the overflow and increment (p+q) | |
| 677 if (lo > m) { | |
| 678 lo &= m; | |
| 679 ++lo; | |
| 680 } | |
| 681 return (_rand_seed = lo); | |
| 682 } | |
| 683 | |
| 684 // The INITIALIZED state is distinguished from the SUSPENDED state because the | |
| 685 // conditions in which a thread is first started are different from those in which | |
| 686 // a suspension is resumed. These differences make it hard for us to apply the | |
| 687 // tougher checks when starting threads that we want to do when resuming them. | |
| 688 // However, when start_thread is called as a result of Thread.start, on a Java | |
| 689 // thread, the operation is synchronized on the Java Thread object. So there | |
| 690 // cannot be a race to start the thread and hence for the thread to exit while | |
| 691 // we are working on it. Non-Java threads that start Java threads either have | |
| 692 // to do so in a context in which races are impossible, or should do appropriate | |
| 693 // locking. | |
| 694 | |
| 695 void os::start_thread(Thread* thread) { | |
| 696 // guard suspend/resume | |
| 697 MutexLockerEx ml(thread->SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 698 OSThread* osthread = thread->osthread(); | |
| 699 osthread->set_state(RUNNABLE); | |
| 700 pd_start_thread(thread); | |
| 701 } | |
| 702 | |
| 703 //--------------------------------------------------------------------------- | |
| 704 // Helper functions for fatal error handler | |
| 705 | |
| 706 void os::print_hex_dump(outputStream* st, address start, address end, int unitsize) { | |
| 707 assert(unitsize == 1 || unitsize == 2 || unitsize == 4 || unitsize == 8, "just checking"); | |
| 708 | |
| 709 int cols = 0; | |
| 710 int cols_per_line = 0; | |
| 711 switch (unitsize) { | |
| 712 case 1: cols_per_line = 16; break; | |
| 713 case 2: cols_per_line = 8; break; | |
| 714 case 4: cols_per_line = 4; break; | |
| 715 case 8: cols_per_line = 2; break; | |
| 716 default: return; | |
| 717 } | |
| 718 | |
| 719 address p = start; | |
| 720 st->print(PTR_FORMAT ": ", start); | |
| 721 while (p < end) { | |
| 722 switch (unitsize) { | |
| 723 case 1: st->print("%02x", *(u1*)p); break; | |
| 724 case 2: st->print("%04x", *(u2*)p); break; | |
| 725 case 4: st->print("%08x", *(u4*)p); break; | |
| 726 case 8: st->print("%016" FORMAT64_MODIFIER "x", *(u8*)p); break; | |
| 727 } | |
| 728 p += unitsize; | |
| 729 cols++; | |
| 730 if (cols >= cols_per_line && p < end) { | |
| 731 cols = 0; | |
| 732 st->cr(); | |
| 733 st->print(PTR_FORMAT ": ", p); | |
| 734 } else { | |
| 735 st->print(" "); | |
| 736 } | |
| 737 } | |
| 738 st->cr(); | |
| 739 } | |
| 740 | |
| 741 void os::print_environment_variables(outputStream* st, const char** env_list, | |
| 742 char* buffer, int len) { | |
| 743 if (env_list) { | |
| 744 st->print_cr("Environment Variables:"); | |
| 745 | |
| 746 for (int i = 0; env_list[i] != NULL; i++) { | |
| 747 if (getenv(env_list[i], buffer, len)) { | |
| 748 st->print(env_list[i]); | |
| 749 st->print("="); | |
| 750 st->print_cr(buffer); | |
| 751 } | |
| 752 } | |
| 753 } | |
| 754 } | |
| 755 | |
| 756 void os::print_cpu_info(outputStream* st) { | |
| 757 // cpu | |
| 758 st->print("CPU:"); | |
| 759 st->print("total %d", os::processor_count()); | |
| 760 // It's not safe to query number of active processors after crash | |
| 761 // st->print("(active %d)", os::active_processor_count()); | |
| 762 st->print(" %s", VM_Version::cpu_features()); | |
| 763 st->cr(); | |
|
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764 pd_print_cpu_info(st); |
| 0 | 765 } |
| 766 | |
| 767 void os::print_date_and_time(outputStream *st) { | |
| 768 time_t tloc; | |
| 769 (void)time(&tloc); | |
| 770 st->print("time: %s", ctime(&tloc)); // ctime adds newline. | |
| 771 | |
| 772 double t = os::elapsedTime(); | |
| 773 // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in | |
| 774 // Linux. Must be a bug in glibc ? Workaround is to round "t" to int | |
| 775 // before printf. We lost some precision, but who cares? | |
| 776 st->print_cr("elapsed time: %d seconds", (int)t); | |
| 777 } | |
| 778 | |
|
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779 // moved from debug.cpp (used to be find()) but still called from there |
| 1907 | 780 // The verbose parameter is only set by the debug code in one case |
| 781 void os::print_location(outputStream* st, intptr_t x, bool verbose) { | |
|
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782 address addr = (address)x; |
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783 CodeBlob* b = CodeCache::find_blob_unsafe(addr); |
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784 if (b != NULL) { |
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785 if (b->is_buffer_blob()) { |
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786 // the interpreter is generated into a buffer blob |
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787 InterpreterCodelet* i = Interpreter::codelet_containing(addr); |
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788 if (i != NULL) { |
| 1907 | 789 st->print_cr(INTPTR_FORMAT " is an Interpreter codelet", addr); |
|
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790 i->print_on(st); |
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791 return; |
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792 } |
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793 if (Interpreter::contains(addr)) { |
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794 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code" |
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795 " (not bytecode specific)", addr); |
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796 return; |
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797 } |
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798 // |
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799 if (AdapterHandlerLibrary::contains(b)) { |
| 1907 | 800 st->print_cr(INTPTR_FORMAT " is an AdapterHandler", addr); |
|
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801 AdapterHandlerLibrary::print_handler_on(st, b); |
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802 } |
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803 // the stubroutines are generated into a buffer blob |
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804 StubCodeDesc* d = StubCodeDesc::desc_for(addr); |
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805 if (d != NULL) { |
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806 d->print_on(st); |
| 1907 | 807 if (verbose) st->cr(); |
|
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808 return; |
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809 } |
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810 if (StubRoutines::contains(addr)) { |
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811 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) " |
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812 "stub routine", addr); |
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813 return; |
|
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814 } |
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815 // the InlineCacheBuffer is using stubs generated into a buffer blob |
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816 if (InlineCacheBuffer::contains(addr)) { |
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817 st->print_cr(INTPTR_FORMAT " is pointing into InlineCacheBuffer", addr); |
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|
818 return; |
|
126ea7725993
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1642
diff
changeset
|
819 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
820 VtableStub* v = VtableStubs::stub_containing(addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
821 if (v != NULL) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
822 v->print_on(st); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
823 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
824 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
825 } |
| 1907 | 826 if (verbose && b->is_nmethod()) { |
|
1681
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parents:
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diff
changeset
|
827 ResourceMark rm; |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
828 st->print("%#p: Compiled ", addr); |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
829 ((nmethod*)b)->method()->print_value_on(st); |
|
126ea7725993
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changeset
|
830 st->print(" = (CodeBlob*)" INTPTR_FORMAT, b); |
|
126ea7725993
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parents:
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changeset
|
831 st->cr(); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
832 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
833 } |
| 1907 | 834 st->print(INTPTR_FORMAT " ", b); |
|
1681
126ea7725993
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|
835 if ( b->is_nmethod()) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
836 if (b->is_zombie()) { |
| 1907 | 837 st->print_cr("is zombie nmethod"); |
|
1681
126ea7725993
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bobv
parents:
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diff
changeset
|
838 } else if (b->is_not_entrant()) { |
| 1907 | 839 st->print_cr("is non-entrant nmethod"); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
840 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
841 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
842 b->print_on(st); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
843 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
844 } |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
845 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
846 if (Universe::heap()->is_in(addr)) { |
|
126ea7725993
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bobv
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diff
changeset
|
847 HeapWord* p = Universe::heap()->block_start(addr); |
|
126ea7725993
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bobv
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diff
changeset
|
848 bool print = false; |
|
126ea7725993
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bobv
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diff
changeset
|
849 // If we couldn't find it it just may mean that heap wasn't parseable |
|
126ea7725993
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bobv
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changeset
|
850 // 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
|
851 if (p != NULL && Universe::heap()->block_is_obj(p)) { |
|
126ea7725993
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changeset
|
852 print = true; |
|
126ea7725993
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parents:
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diff
changeset
|
853 } else if (p == NULL && ((oopDesc*)addr)->is_oop()) { |
|
126ea7725993
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bobv
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diff
changeset
|
854 p = (HeapWord*) addr; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
855 print = true; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
856 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
857 if (print) { |
| 1907 | 858 st->print_cr(INTPTR_FORMAT " is an oop", addr); |
|
1681
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|
859 oop(p)->print_on(st); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
860 if (p != (HeapWord*)x && oop(p)->is_constMethod() && |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
861 constMethodOop(p)->contains(addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
862 Thread *thread = Thread::current(); |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
863 HandleMark hm(thread); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
864 methodHandle mh (thread, constMethodOop(p)->method()); |
|
126ea7725993
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bobv
parents:
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diff
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|
865 if (!mh->is_native()) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
866 st->print_cr("bci_from(%p) = %d; print_codes():", |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
867 addr, mh->bci_from(address(x))); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
868 mh->print_codes_on(st); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
869 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
870 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
871 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
872 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
873 } else { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
874 if (Universe::heap()->is_in_reserved(addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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changeset
|
875 st->print_cr(INTPTR_FORMAT " is an unallocated location " |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
876 "in the heap", addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
877 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
878 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
879 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
880 if (JNIHandles::is_global_handle((jobject) addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
881 st->print_cr(INTPTR_FORMAT " is a global jni handle", addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
882 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
883 } |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
884 if (JNIHandles::is_weak_global_handle((jobject) addr)) { |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
885 st->print_cr(INTPTR_FORMAT " is a weak global jni handle", addr); |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
886 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
887 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
888 #ifndef PRODUCT |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
889 // we don't keep the block list in product mode |
|
126ea7725993
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parents:
1642
diff
changeset
|
890 if (JNIHandleBlock::any_contains((jobject) addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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changeset
|
891 st->print_cr(INTPTR_FORMAT " is a local jni handle", addr); |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
892 return; |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
893 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
894 #endif |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
895 |
|
126ea7725993
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bobv
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diff
changeset
|
896 for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1642
diff
changeset
|
897 // Check for privilege stack |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
898 if (thread->privileged_stack_top() != NULL && |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
899 thread->privileged_stack_top()->contains(addr)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
900 st->print_cr(INTPTR_FORMAT " is pointing into the privilege stack " |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
901 "for thread: " INTPTR_FORMAT, addr, thread); |
| 1907 | 902 if (verbose) thread->print_on(st); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
903 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
904 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
905 // If the addr is a java thread print information about that. |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
906 if (addr == (address)thread) { |
| 1907 | 907 if (verbose) { |
| 908 thread->print_on(st); | |
| 909 } else { | |
| 910 st->print_cr(INTPTR_FORMAT " is a thread", addr); | |
| 911 } | |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
912 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
913 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
914 // If the addr is in the stack region for this thread then report that |
|
126ea7725993
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bobv
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diff
changeset
|
915 // and print thread info |
|
126ea7725993
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bobv
parents:
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diff
changeset
|
916 if (thread->stack_base() >= addr && |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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diff
changeset
|
917 addr > (thread->stack_base() - thread->stack_size())) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
918 st->print_cr(INTPTR_FORMAT " is pointing into the stack for thread: " |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
919 INTPTR_FORMAT, addr, thread); |
| 1907 | 920 if (verbose) thread->print_on(st); |
|
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
921 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
922 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
923 |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
924 } |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
925 // Try an OS specific find |
|
126ea7725993
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bobv
parents:
1642
diff
changeset
|
926 if (os::find(addr, st)) { |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1642
diff
changeset
|
927 return; |
|
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
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diff
changeset
|
928 } |
|
126ea7725993
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bobv
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diff
changeset
|
929 |
| 1907 | 930 st->print_cr(INTPTR_FORMAT " is an unknown value", addr); |
|
1681
126ea7725993
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bobv
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|
931 } |
| 0 | 932 |
| 933 // Looks like all platforms except IA64 can use the same function to check | |
| 934 // if C stack is walkable beyond current frame. The check for fp() is not | |
| 935 // necessary on Sparc, but it's harmless. | |
| 936 bool os::is_first_C_frame(frame* fr) { | |
| 937 #ifdef IA64 | |
| 938 // In order to walk native frames on Itanium, we need to access the unwind | |
| 939 // table, which is inside ELF. We don't want to parse ELF after fatal error, | |
| 940 // so return true for IA64. If we need to support C stack walking on IA64, | |
| 941 // this function needs to be moved to CPU specific files, as fp() on IA64 | |
| 942 // is register stack, which grows towards higher memory address. | |
| 943 return true; | |
| 944 #endif | |
| 945 | |
| 946 // Load up sp, fp, sender sp and sender fp, check for reasonable values. | |
| 947 // Check usp first, because if that's bad the other accessors may fault | |
| 948 // on some architectures. Ditto ufp second, etc. | |
| 949 uintptr_t fp_align_mask = (uintptr_t)(sizeof(address)-1); | |
| 950 // sp on amd can be 32 bit aligned. | |
| 951 uintptr_t sp_align_mask = (uintptr_t)(sizeof(int)-1); | |
| 952 | |
| 953 uintptr_t usp = (uintptr_t)fr->sp(); | |
| 954 if ((usp & sp_align_mask) != 0) return true; | |
| 955 | |
| 956 uintptr_t ufp = (uintptr_t)fr->fp(); | |
| 957 if ((ufp & fp_align_mask) != 0) return true; | |
| 958 | |
| 959 uintptr_t old_sp = (uintptr_t)fr->sender_sp(); | |
| 960 if ((old_sp & sp_align_mask) != 0) return true; | |
| 961 if (old_sp == 0 || old_sp == (uintptr_t)-1) return true; | |
| 962 | |
| 963 uintptr_t old_fp = (uintptr_t)fr->link(); | |
| 964 if ((old_fp & fp_align_mask) != 0) return true; | |
| 965 if (old_fp == 0 || old_fp == (uintptr_t)-1 || old_fp == ufp) return true; | |
| 966 | |
| 967 // stack grows downwards; if old_fp is below current fp or if the stack | |
| 968 // frame is too large, either the stack is corrupted or fp is not saved | |
| 969 // on stack (i.e. on x86, ebp may be used as general register). The stack | |
| 970 // is not walkable beyond current frame. | |
| 971 if (old_fp < ufp) return true; | |
| 972 if (old_fp - ufp > 64 * K) return true; | |
| 973 | |
| 974 return false; | |
| 975 } | |
| 976 | |
| 977 #ifdef ASSERT | |
| 978 extern "C" void test_random() { | |
| 979 const double m = 2147483647; | |
| 980 double mean = 0.0, variance = 0.0, t; | |
| 981 long reps = 10000; | |
| 982 unsigned long seed = 1; | |
| 983 | |
| 984 tty->print_cr("seed %ld for %ld repeats...", seed, reps); | |
| 985 os::init_random(seed); | |
| 986 long num; | |
| 987 for (int k = 0; k < reps; k++) { | |
| 988 num = os::random(); | |
| 989 double u = (double)num / m; | |
| 990 assert(u >= 0.0 && u <= 1.0, "bad random number!"); | |
| 991 | |
| 992 // calculate mean and variance of the random sequence | |
| 993 mean += u; | |
| 994 variance += (u*u); | |
| 995 } | |
| 996 mean /= reps; | |
| 997 variance /= (reps - 1); | |
| 998 | |
| 999 assert(num == 1043618065, "bad seed"); | |
| 1000 tty->print_cr("mean of the 1st 10000 numbers: %f", mean); | |
| 1001 tty->print_cr("variance of the 1st 10000 numbers: %f", variance); | |
| 1002 const double eps = 0.0001; | |
| 1003 t = fabsd(mean - 0.5018); | |
| 1004 assert(t < eps, "bad mean"); | |
| 1005 t = (variance - 0.3355) < 0.0 ? -(variance - 0.3355) : variance - 0.3355; | |
| 1006 assert(t < eps, "bad variance"); | |
| 1007 } | |
| 1008 #endif | |
| 1009 | |
| 1010 | |
| 1011 // Set up the boot classpath. | |
| 1012 | |
| 1013 char* os::format_boot_path(const char* format_string, | |
| 1014 const char* home, | |
| 1015 int home_len, | |
| 1016 char fileSep, | |
| 1017 char pathSep) { | |
| 1018 assert((fileSep == '/' && pathSep == ':') || | |
| 1019 (fileSep == '\\' && pathSep == ';'), "unexpected seperator chars"); | |
| 1020 | |
| 1021 // Scan the format string to determine the length of the actual | |
| 1022 // boot classpath, and handle platform dependencies as well. | |
| 1023 int formatted_path_len = 0; | |
| 1024 const char* p; | |
| 1025 for (p = format_string; *p != 0; ++p) { | |
| 1026 if (*p == '%') formatted_path_len += home_len - 1; | |
| 1027 ++formatted_path_len; | |
| 1028 } | |
| 1029 | |
| 1030 char* formatted_path = NEW_C_HEAP_ARRAY(char, formatted_path_len + 1); | |
| 1031 if (formatted_path == NULL) { | |
| 1032 return NULL; | |
| 1033 } | |
| 1034 | |
| 1035 // Create boot classpath from format, substituting separator chars and | |
| 1036 // java home directory. | |
| 1037 char* q = formatted_path; | |
| 1038 for (p = format_string; *p != 0; ++p) { | |
| 1039 switch (*p) { | |
| 1040 case '%': | |
| 1041 strcpy(q, home); | |
| 1042 q += home_len; | |
| 1043 break; | |
| 1044 case '/': | |
| 1045 *q++ = fileSep; | |
| 1046 break; | |
| 1047 case ':': | |
| 1048 *q++ = pathSep; | |
| 1049 break; | |
| 1050 default: | |
| 1051 *q++ = *p; | |
| 1052 } | |
| 1053 } | |
| 1054 *q = '\0'; | |
| 1055 | |
| 1056 assert((q - formatted_path) == formatted_path_len, "formatted_path size botched"); | |
| 1057 return formatted_path; | |
| 1058 } | |
| 1059 | |
| 1060 | |
| 1061 bool os::set_boot_path(char fileSep, char pathSep) { | |
| 1062 const char* home = Arguments::get_java_home(); | |
| 1063 int home_len = (int)strlen(home); | |
| 1064 | |
| 1065 static const char* meta_index_dir_format = "%/lib/"; | |
| 1066 static const char* meta_index_format = "%/lib/meta-index"; | |
| 1067 char* meta_index = format_boot_path(meta_index_format, home, home_len, fileSep, pathSep); | |
| 1068 if (meta_index == NULL) return false; | |
| 1069 char* meta_index_dir = format_boot_path(meta_index_dir_format, home, home_len, fileSep, pathSep); | |
| 1070 if (meta_index_dir == NULL) return false; | |
| 1071 Arguments::set_meta_index_path(meta_index, meta_index_dir); | |
| 1072 | |
| 1073 // Any modification to the JAR-file list, for the boot classpath must be | |
| 1074 // aligned with install/install/make/common/Pack.gmk. Note: boot class | |
| 1075 // path class JARs, are stripped for StackMapTable to reduce download size. | |
| 1076 static const char classpath_format[] = | |
| 1077 "%/lib/resources.jar:" | |
| 1078 "%/lib/rt.jar:" | |
| 1079 "%/lib/sunrsasign.jar:" | |
| 1080 "%/lib/jsse.jar:" | |
| 1081 "%/lib/jce.jar:" | |
| 1082 "%/lib/charsets.jar:" | |
| 1083 "%/classes"; | |
| 1084 char* sysclasspath = format_boot_path(classpath_format, home, home_len, fileSep, pathSep); | |
| 1085 if (sysclasspath == NULL) return false; | |
| 1086 Arguments::set_sysclasspath(sysclasspath); | |
| 1087 | |
| 1088 return true; | |
| 1089 } | |
| 1090 | |
| 691 | 1091 /* |
| 1092 * Splits a path, based on its separator, the number of | |
| 1093 * elements is returned back in n. | |
| 1094 * It is the callers responsibility to: | |
| 1095 * a> check the value of n, and n may be 0. | |
| 1096 * b> ignore any empty path elements | |
| 1097 * c> free up the data. | |
| 1098 */ | |
| 1099 char** os::split_path(const char* path, int* n) { | |
| 1100 *n = 0; | |
| 1101 if (path == NULL || strlen(path) == 0) { | |
| 1102 return NULL; | |
| 1103 } | |
| 1104 const char psepchar = *os::path_separator(); | |
| 1105 char* inpath = (char*)NEW_C_HEAP_ARRAY(char, strlen(path) + 1); | |
| 1106 if (inpath == NULL) { | |
| 1107 return NULL; | |
| 1108 } | |
| 1109 strncpy(inpath, path, strlen(path)); | |
| 1110 int count = 1; | |
| 1111 char* p = strchr(inpath, psepchar); | |
| 1112 // Get a count of elements to allocate memory | |
| 1113 while (p != NULL) { | |
| 1114 count++; | |
| 1115 p++; | |
| 1116 p = strchr(p, psepchar); | |
| 1117 } | |
| 1118 char** opath = (char**) NEW_C_HEAP_ARRAY(char*, count); | |
| 1119 if (opath == NULL) { | |
| 1120 return NULL; | |
| 1121 } | |
| 1122 | |
| 1123 // do the actual splitting | |
| 1124 p = inpath; | |
| 1125 for (int i = 0 ; i < count ; i++) { | |
| 1126 size_t len = strcspn(p, os::path_separator()); | |
| 1127 if (len > JVM_MAXPATHLEN) { | |
| 1128 return NULL; | |
| 1129 } | |
| 1130 // allocate the string and add terminator storage | |
| 1131 char* s = (char*)NEW_C_HEAP_ARRAY(char, len + 1); | |
| 1132 if (s == NULL) { | |
| 1133 return NULL; | |
| 1134 } | |
| 1135 strncpy(s, p, len); | |
| 1136 s[len] = '\0'; | |
| 1137 opath[i] = s; | |
| 1138 p += len + 1; | |
| 1139 } | |
| 1140 FREE_C_HEAP_ARRAY(char, inpath); | |
| 1141 *n = count; | |
| 1142 return opath; | |
| 1143 } | |
| 1144 | |
| 0 | 1145 void os::set_memory_serialize_page(address page) { |
| 1146 int count = log2_intptr(sizeof(class JavaThread)) - log2_intptr(64); | |
| 1147 _mem_serialize_page = (volatile int32_t *)page; | |
| 1148 // We initialize the serialization page shift count here | |
| 1149 // We assume a cache line size of 64 bytes | |
| 1150 assert(SerializePageShiftCount == count, | |
| 1151 "thread size changed, fix SerializePageShiftCount constant"); | |
| 1152 set_serialize_page_mask((uintptr_t)(vm_page_size() - sizeof(int32_t))); | |
| 1153 } | |
| 1154 | |
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1155 static volatile intptr_t SerializePageLock = 0; |
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1156 |
| 0 | 1157 // This method is called from signal handler when SIGSEGV occurs while the current |
| 1158 // thread tries to store to the "read-only" memory serialize page during state | |
| 1159 // transition. | |
| 1160 void os::block_on_serialize_page_trap() { | |
| 1161 if (TraceSafepoint) { | |
| 1162 tty->print_cr("Block until the serialize page permission restored"); | |
| 1163 } | |
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1164 // When VMThread is holding the SerializePageLock during modifying the |
| 0 | 1165 // access permission of the memory serialize page, the following call |
| 1166 // will block until the permission of that page is restored to rw. | |
| 1167 // Generally, it is unsafe to manipulate locks in signal handlers, but in | |
| 1168 // this case, it's OK as the signal is synchronous and we know precisely when | |
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1169 // it can occur. |
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1170 Thread::muxAcquire(&SerializePageLock, "set_memory_serialize_page"); |
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1171 Thread::muxRelease(&SerializePageLock); |
| 0 | 1172 } |
| 1173 | |
| 1174 // Serialize all thread state variables | |
| 1175 void os::serialize_thread_states() { | |
| 1176 // On some platforms such as Solaris & Linux, the time duration of the page | |
| 1177 // permission restoration is observed to be much longer than expected due to | |
| 1178 // scheduler starvation problem etc. To avoid the long synchronization | |
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1179 // time and expensive page trap spinning, 'SerializePageLock' is used to block |
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1180 // the mutator thread if such case is encountered. See bug 6546278 for details. |
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1181 Thread::muxAcquire(&SerializePageLock, "serialize_thread_states"); |
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1182 os::protect_memory((char *)os::get_memory_serialize_page(), |
|
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1183 os::vm_page_size(), MEM_PROT_READ); |
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1184 os::protect_memory((char *)os::get_memory_serialize_page(), |
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1185 os::vm_page_size(), MEM_PROT_RW); |
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1186 Thread::muxRelease(&SerializePageLock); |
| 0 | 1187 } |
| 1188 | |
| 1189 // Returns true if the current stack pointer is above the stack shadow | |
| 1190 // pages, false otherwise. | |
| 1191 | |
| 1192 bool os::stack_shadow_pages_available(Thread *thread, methodHandle method) { | |
| 1193 assert(StackRedPages > 0 && StackYellowPages > 0,"Sanity check"); | |
| 1194 address sp = current_stack_pointer(); | |
| 1195 // Check if we have StackShadowPages above the yellow zone. This parameter | |
| 605 | 1196 // is dependent on the depth of the maximum VM call stack possible from |
| 0 | 1197 // the handler for stack overflow. 'instanceof' in the stack overflow |
| 1198 // handler or a println uses at least 8k stack of VM and native code | |
| 1199 // respectively. | |
| 1200 const int framesize_in_bytes = | |
| 1201 Interpreter::size_top_interpreter_activation(method()) * wordSize; | |
| 1202 int reserved_area = ((StackShadowPages + StackRedPages + StackYellowPages) | |
| 1203 * vm_page_size()) + framesize_in_bytes; | |
| 1204 // The very lower end of the stack | |
| 1205 address stack_limit = thread->stack_base() - thread->stack_size(); | |
| 1206 return (sp > (stack_limit + reserved_area)); | |
| 1207 } | |
| 1208 | |
| 1209 size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size, | |
| 1210 uint min_pages) | |
| 1211 { | |
| 1212 assert(min_pages > 0, "sanity"); | |
| 1213 if (UseLargePages) { | |
| 1214 const size_t max_page_size = region_max_size / min_pages; | |
| 1215 | |
| 1216 for (unsigned int i = 0; _page_sizes[i] != 0; ++i) { | |
| 1217 const size_t sz = _page_sizes[i]; | |
| 1218 const size_t mask = sz - 1; | |
| 1219 if ((region_min_size & mask) == 0 && (region_max_size & mask) == 0) { | |
| 1220 // The largest page size with no fragmentation. | |
| 1221 return sz; | |
| 1222 } | |
| 1223 | |
| 1224 if (sz <= max_page_size) { | |
| 1225 // The largest page size that satisfies the min_pages requirement. | |
| 1226 return sz; | |
| 1227 } | |
| 1228 } | |
| 1229 } | |
| 1230 | |
| 1231 return vm_page_size(); | |
| 1232 } | |
| 1233 | |
| 1234 #ifndef PRODUCT | |
| 3859 | 1235 void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count) |
| 1236 { | |
| 1237 if (TracePageSizes) { | |
| 1238 tty->print("%s: ", str); | |
| 1239 for (int i = 0; i < count; ++i) { | |
| 1240 tty->print(" " SIZE_FORMAT, page_sizes[i]); | |
| 1241 } | |
| 1242 tty->cr(); | |
| 1243 } | |
| 1244 } | |
| 1245 | |
| 0 | 1246 void os::trace_page_sizes(const char* str, const size_t region_min_size, |
| 1247 const size_t region_max_size, const size_t page_size, | |
| 1248 const char* base, const size_t size) | |
| 1249 { | |
| 1250 if (TracePageSizes) { | |
| 1251 tty->print_cr("%s: min=" SIZE_FORMAT " max=" SIZE_FORMAT | |
| 1252 " pg_sz=" SIZE_FORMAT " base=" PTR_FORMAT | |
| 1253 " size=" SIZE_FORMAT, | |
| 1254 str, region_min_size, region_max_size, | |
| 1255 page_size, base, size); | |
| 1256 } | |
| 1257 } | |
| 1258 #endif // #ifndef PRODUCT | |
| 1259 | |
| 1260 // This is the working definition of a server class machine: | |
| 1261 // >= 2 physical CPU's and >=2GB of memory, with some fuzz | |
| 1262 // because the graphics memory (?) sometimes masks physical memory. | |
| 1263 // If you want to change the definition of a server class machine | |
| 1264 // on some OS or platform, e.g., >=4GB on Windohs platforms, | |
| 1265 // then you'll have to parameterize this method based on that state, | |
| 1266 // as was done for logical processors here, or replicate and | |
| 1267 // specialize this method for each platform. (Or fix os to have | |
| 1268 // some inheritance structure and use subclassing. Sigh.) | |
| 1269 // If you want some platform to always or never behave as a server | |
| 1270 // class machine, change the setting of AlwaysActAsServerClassMachine | |
| 1271 // and NeverActAsServerClassMachine in globals*.hpp. | |
| 1272 bool os::is_server_class_machine() { | |
| 1273 // First check for the early returns | |
| 1274 if (NeverActAsServerClassMachine) { | |
| 1275 return false; | |
| 1276 } | |
| 1277 if (AlwaysActAsServerClassMachine) { | |
| 1278 return true; | |
| 1279 } | |
| 1280 // Then actually look at the machine | |
| 1281 bool result = false; | |
| 1282 const unsigned int server_processors = 2; | |
| 1283 const julong server_memory = 2UL * G; | |
| 1284 // We seem not to get our full complement of memory. | |
| 1285 // We allow some part (1/8?) of the memory to be "missing", | |
| 1286 // based on the sizes of DIMMs, and maybe graphics cards. | |
| 1287 const julong missing_memory = 256UL * M; | |
| 1288 | |
| 1289 /* Is this a server class machine? */ | |
| 1290 if ((os::active_processor_count() >= (int)server_processors) && | |
| 1291 (os::physical_memory() >= (server_memory - missing_memory))) { | |
| 1292 const unsigned int logical_processors = | |
| 1293 VM_Version::logical_processors_per_package(); | |
| 1294 if (logical_processors > 1) { | |
| 1295 const unsigned int physical_packages = | |
| 1296 os::active_processor_count() / logical_processors; | |
| 1297 if (physical_packages > server_processors) { | |
| 1298 result = true; | |
| 1299 } | |
| 1300 } else { | |
| 1301 result = true; | |
| 1302 } | |
| 1303 } | |
| 1304 return result; | |
| 1305 } | |
|
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1306 |
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1307 // Read file line by line, if line is longer than bsize, |
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1308 // skip rest of line. |
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1309 int os::get_line_chars(int fd, char* buf, const size_t bsize){ |
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1310 size_t sz, i = 0; |
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1311 |
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1312 // read until EOF, EOL or buf is full |
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1313 while ((sz = (int) read(fd, &buf[i], 1)) == 1 && i < (bsize-1) && buf[i] != '\n') { |
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1314 ++i; |
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1315 } |
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1316 |
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1317 if (buf[i] == '\n') { |
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1318 // EOL reached so ignore EOL character and return |
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1319 |
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1320 buf[i] = 0; |
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1321 return (int) i; |
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1322 } |
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1323 |
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1324 buf[i+1] = 0; |
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1325 |
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1326 if (sz != 1) { |
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1327 // EOF reached. if we read chars before EOF return them and |
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1328 // return EOF on next call otherwise return EOF |
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1329 |
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1330 return (i == 0) ? -1 : (int) i; |
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1331 } |
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1332 |
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1333 // line is longer than size of buf, skip to EOL |
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1334 int ch; |
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1335 while (read(fd, &ch, 1) == 1 && ch != '\n') { |
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1336 // Do nothing |
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1337 } |
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1338 |
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1339 // return initial part of line that fits in buf. |
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1340 // If we reached EOF, it will be returned on next call. |
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1341 |
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1342 return (int) i; |
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1343 } |