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comparison src/share/vm/services/lowMemoryDetector.cpp @ 2195:bf8517f4e4d0

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6766644: Redefinition of compiled method fails with assertion "Can not load classes with the Compiler thread" Summary: Defer posting events from the compiler thread: use service thread Reviewed-by: coleenp, dholmes, never, dcubed
author kamg
date Wed, 02 Feb 2011 14:38:01 -0500
parents 3582bf76420e
children da91efe96a93
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equal deleted inserted replaced
2194:face83fc8882 2195:bf8517f4e4d0
1 /* 1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
32 #include "runtime/mutex.hpp" 32 #include "runtime/mutex.hpp"
33 #include "runtime/mutexLocker.hpp" 33 #include "runtime/mutexLocker.hpp"
34 #include "services/lowMemoryDetector.hpp" 34 #include "services/lowMemoryDetector.hpp"
35 #include "services/management.hpp" 35 #include "services/management.hpp"
36 36
37 LowMemoryDetectorThread* LowMemoryDetector::_detector_thread = NULL;
38 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false; 37 volatile bool LowMemoryDetector::_enabled_for_collected_pools = false;
39 volatile jint LowMemoryDetector::_disabled_count = 0; 38 volatile jint LowMemoryDetector::_disabled_count = 0;
40 39
41 void LowMemoryDetector::initialize() {
42 EXCEPTION_MARK;
43
44 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
45 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
46
47 const char thread_name[] = "Low Memory Detector";
48 Handle string = java_lang_String::create_from_str(thread_name, CHECK);
49
50 // Initialize thread_oop to put it into the system threadGroup
51 Handle thread_group (THREAD, Universe::system_thread_group());
52 JavaValue result(T_VOID);
53 JavaCalls::call_special(&result, thread_oop,
54 klass,
55 vmSymbols::object_initializer_name(),
56 vmSymbols::threadgroup_string_void_signature(),
57 thread_group,
58 string,
59 CHECK);
60
61 {
62 MutexLocker mu(Threads_lock);
63 _detector_thread = new LowMemoryDetectorThread(&low_memory_detector_thread_entry);
64
65 // At this point it may be possible that no osthread was created for the
66 // JavaThread due to lack of memory. We would have to throw an exception
67 // in that case. However, since this must work and we do not allow
68 // exceptions anyway, check and abort if this fails.
69 if (_detector_thread == NULL || _detector_thread->osthread() == NULL) {
70 vm_exit_during_initialization("java.lang.OutOfMemoryError",
71 "unable to create new native thread");
72 }
73
74 java_lang_Thread::set_thread(thread_oop(), _detector_thread);
75 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
76 java_lang_Thread::set_daemon(thread_oop());
77 _detector_thread->set_threadObj(thread_oop());
78
79 Threads::add(_detector_thread);
80 Thread::start(_detector_thread);
81 }
82 }
83
84 bool LowMemoryDetector::has_pending_requests() { 40 bool LowMemoryDetector::has_pending_requests() {
85 assert(LowMemory_lock->owned_by_self(), "Must own LowMemory_lock"); 41 assert(Service_lock->owned_by_self(), "Must own Service_lock");
86 bool has_requests = false; 42 bool has_requests = false;
87 int num_memory_pools = MemoryService::num_memory_pools(); 43 int num_memory_pools = MemoryService::num_memory_pools();
88 for (int i = 0; i < num_memory_pools; i++) { 44 for (int i = 0; i < num_memory_pools; i++) {
89 MemoryPool* pool = MemoryService::get_memory_pool(i); 45 MemoryPool* pool = MemoryService::get_memory_pool(i);
90 SensorInfo* sensor = pool->usage_sensor(); 46 SensorInfo* sensor = pool->usage_sensor();
98 } 54 }
99 } 55 }
100 return has_requests; 56 return has_requests;
101 } 57 }
102 58
103 void LowMemoryDetector::low_memory_detector_thread_entry(JavaThread* jt, TRAPS) { 59 void LowMemoryDetector::process_sensor_changes(TRAPS) {
104 while (true) { 60 ResourceMark rm(THREAD);
105 bool sensors_changed = false; 61 HandleMark hm(THREAD);
106 62
107 { 63 // No need to hold Service_lock to call out to Java
108 // _no_safepoint_check_flag is used here as LowMemory_lock is a 64 int num_memory_pools = MemoryService::num_memory_pools();
109 // special lock and the VMThread may acquire this lock at safepoint. 65 for (int i = 0; i < num_memory_pools; i++) {
110 // Need state transition ThreadBlockInVM so that this thread 66 MemoryPool* pool = MemoryService::get_memory_pool(i);
111 // will be handled by safepoint correctly when this thread is 67 SensorInfo* sensor = pool->usage_sensor();
112 // notified at a safepoint. 68 SensorInfo* gc_sensor = pool->gc_usage_sensor();
113 69 if (sensor != NULL && sensor->has_pending_requests()) {
114 // This ThreadBlockInVM object is not also considered to be 70 sensor->process_pending_requests(CHECK);
115 // suspend-equivalent because LowMemoryDetector threads are 71 }
116 // not visible to external suspension. 72 if (gc_sensor != NULL && gc_sensor->has_pending_requests()) {
117 73 gc_sensor->process_pending_requests(CHECK);
118 ThreadBlockInVM tbivm(jt);
119
120 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag);
121 while (!(sensors_changed = has_pending_requests())) {
122 // wait until one of the sensors has pending requests
123 LowMemory_lock->wait(Mutex::_no_safepoint_check_flag);
124 }
125 }
126
127 {
128 ResourceMark rm(THREAD);
129 HandleMark hm(THREAD);
130
131 // No need to hold LowMemory_lock to call out to Java
132 int num_memory_pools = MemoryService::num_memory_pools();
133 for (int i = 0; i < num_memory_pools; i++) {
134 MemoryPool* pool = MemoryService::get_memory_pool(i);
135 SensorInfo* sensor = pool->usage_sensor();
136 SensorInfo* gc_sensor = pool->gc_usage_sensor();
137 if (sensor != NULL && sensor->has_pending_requests()) {
138 sensor->process_pending_requests(CHECK);
139 }
140 if (gc_sensor != NULL && gc_sensor->has_pending_requests()) {
141 gc_sensor->process_pending_requests(CHECK);
142 }
143 }
144 } 74 }
145 } 75 }
146 } 76 }
147 77
148 // This method could be called from any Java threads 78 // This method could be called from any Java threads
149 // and also VMThread. 79 // and also VMThread.
150 void LowMemoryDetector::detect_low_memory() { 80 void LowMemoryDetector::detect_low_memory() {
151 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); 81 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
152 82
153 bool has_pending_requests = false; 83 bool has_pending_requests = false;
154 int num_memory_pools = MemoryService::num_memory_pools(); 84 int num_memory_pools = MemoryService::num_memory_pools();
155 for (int i = 0; i < num_memory_pools; i++) { 85 for (int i = 0; i < num_memory_pools; i++) {
156 MemoryPool* pool = MemoryService::get_memory_pool(i); 86 MemoryPool* pool = MemoryService::get_memory_pool(i);
164 has_pending_requests = has_pending_requests || sensor->has_pending_requests(); 94 has_pending_requests = has_pending_requests || sensor->has_pending_requests();
165 } 95 }
166 } 96 }
167 97
168 if (has_pending_requests) { 98 if (has_pending_requests) {
169 LowMemory_lock->notify_all(); 99 Service_lock->notify_all();
170 } 100 }
171 } 101 }
172 102
173 // This method could be called from any Java threads 103 // This method could be called from any Java threads
174 // and also VMThread. 104 // and also VMThread.
179 pool->usage_threshold()->high_threshold() == 0) { 109 pool->usage_threshold()->high_threshold() == 0) {
180 return; 110 return;
181 } 111 }
182 112
183 { 113 {
184 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); 114 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
185 115
186 MemoryUsage usage = pool->get_memory_usage(); 116 MemoryUsage usage = pool->get_memory_usage();
187 sensor->set_gauge_sensor_level(usage, 117 sensor->set_gauge_sensor_level(usage,
188 pool->usage_threshold()); 118 pool->usage_threshold());
189 if (sensor->has_pending_requests()) { 119 if (sensor->has_pending_requests()) {
190 // notify sensor state update 120 // notify sensor state update
191 LowMemory_lock->notify_all(); 121 Service_lock->notify_all();
192 } 122 }
193 } 123 }
194 } 124 }
195 125
196 // Only called by VMThread at GC time 126 // Only called by VMThread at GC time
201 pool->gc_usage_threshold()->high_threshold() == 0) { 131 pool->gc_usage_threshold()->high_threshold() == 0) {
202 return; 132 return;
203 } 133 }
204 134
205 { 135 {
206 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); 136 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
207 137
208 MemoryUsage usage = pool->get_last_collection_usage(); 138 MemoryUsage usage = pool->get_last_collection_usage();
209 sensor->set_counter_sensor_level(usage, pool->gc_usage_threshold()); 139 sensor->set_counter_sensor_level(usage, pool->gc_usage_threshold());
210 140
211 if (sensor->has_pending_requests()) { 141 if (sensor->has_pending_requests()) {
212 // notify sensor state update 142 // notify sensor state update
213 LowMemory_lock->notify_all(); 143 Service_lock->notify_all();
214 } 144 }
215 } 145 }
216 } 146 }
217 147
218 // recompute enabled flag 148 // recompute enabled flag
382 &args, 312 &args,
383 CHECK); 313 CHECK);
384 } 314 }
385 315
386 { 316 {
387 // Holds LowMemory_lock and update the sensor state 317 // Holds Service_lock and update the sensor state
388 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); 318 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
389 _sensor_on = true; 319 _sensor_on = true;
390 _sensor_count += count; 320 _sensor_count += count;
391 _pending_trigger_count = _pending_trigger_count - count; 321 _pending_trigger_count = _pending_trigger_count - count;
392 } 322 }
393 } 323 }
408 &args, 338 &args,
409 CHECK); 339 CHECK);
410 } 340 }
411 341
412 { 342 {
413 // Holds LowMemory_lock and update the sensor state 343 // Holds Service_lock and update the sensor state
414 MutexLockerEx ml(LowMemory_lock, Mutex::_no_safepoint_check_flag); 344 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
415 _sensor_on = false; 345 _sensor_on = false;
416 _pending_clear_count = 0; 346 _pending_clear_count = 0;
417 _pending_trigger_count = _pending_trigger_count - count; 347 _pending_trigger_count = _pending_trigger_count - count;
418 } 348 }
419 } 349 }