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comparison: src/share/vm/services/memTrackWorker.cpp

src/share/vm/services/memTrackWorker.cpp

changeset 7074
833b0f92429a
parent 6680
78bbf4d43a14
child 6876
710a3c8b516e
equal deleted inserted replaced
7073:4d3a43351904 7074:833b0f92429a
1 /*
2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "runtime/threadCritical.hpp"
27 #include "services/memTracker.hpp"
28 #include "services/memTrackWorker.hpp"
29 #include "utilities/decoder.hpp"
30 #include "utilities/vmError.hpp"
31
32
33 void GenerationData::reset() {
34 _number_of_classes = 0;
35 while (_recorder_list != NULL) {
36 MemRecorder* tmp = _recorder_list;
37 _recorder_list = _recorder_list->next();
38 MemTracker::release_thread_recorder(tmp);
39 }
40 }
41
42 MemTrackWorker::MemTrackWorker(MemSnapshot* snapshot): _snapshot(snapshot) {
43 // create thread uses cgc thread type for now. We should revisit
44 // the option, or create new thread type.
45 _has_error = !os::create_thread(this, os::cgc_thread);
46 set_name("MemTrackWorker");
47
48 // initial generation circuit buffer
49 if (!has_error()) {
50 _head = _tail = 0;
51 for(int index = 0; index < MAX_GENERATIONS; index ++) {
52 ::new ((void*)&_gen[index]) GenerationData();
53 }
54 }
55 NOT_PRODUCT(_sync_point_count = 0;)
56 NOT_PRODUCT(_merge_count = 0;)
57 NOT_PRODUCT(_last_gen_in_use = 0;)
58 }
59
60 MemTrackWorker::~MemTrackWorker() {
61 for (int index = 0; index < MAX_GENERATIONS; index ++) {
62 _gen[index].reset();
63 }
64 }
65
66 void* MemTrackWorker::operator new(size_t size) throw() {
67 assert(false, "use nothrow version");
68 return NULL;
69 }
70
71 void* MemTrackWorker::operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
72 return allocate(size, false, mtNMT);
73 }
74
75 void MemTrackWorker::start() {
76 os::start_thread(this);
77 }
78
79 /*
80 * Native memory tracking worker thread loop:
81 * 1. merge one generation of memory recorders to staging area
82 * 2. promote staging data to memory snapshot
83 *
84 * This thread can run through safepoint.
85 */
86
87 void MemTrackWorker::run() {
88 assert(MemTracker::is_on(), "native memory tracking is off");
89 this->initialize_thread_local_storage();
90 this->record_stack_base_and_size();
91 assert(_snapshot != NULL, "Worker should not be started");
92 MemRecorder* rec;
93 unsigned long processing_generation = 0;
94 bool worker_idle = false;
95
96 while (!MemTracker::shutdown_in_progress()) {
97 NOT_PRODUCT(_last_gen_in_use = generations_in_use();)
98 {
99 // take a recorder from earliest generation in buffer
100 ThreadCritical tc;
101 rec = _gen[_head].next_recorder();
102 }
103 if (rec != NULL) {
104 if (rec->get_generation() != processing_generation || worker_idle) {
105 processing_generation = rec->get_generation();
106 worker_idle = false;
107 MemTracker::set_current_processing_generation(processing_generation);
108 }
109
110 // merge the recorder into staging area
111 if (!_snapshot->merge(rec)) {
112 MemTracker::shutdown(MemTracker::NMT_out_of_memory);
113 } else {
114 NOT_PRODUCT(_merge_count ++;)
115 }
116 MemTracker::release_thread_recorder(rec);
117 } else {
118 // no more recorder to merge, promote staging area
119 // to snapshot
120 if (_head != _tail) {
121 long number_of_classes;
122 {
123 ThreadCritical tc;
124 if (_gen[_head].has_more_recorder() || _head == _tail) {
125 continue;
126 }
127 number_of_classes = _gen[_head].number_of_classes();
128 _gen[_head].reset();
129
130 // done with this generation, increment _head pointer
131 _head = (_head + 1) % MAX_GENERATIONS;
132 }
133 // promote this generation data to snapshot
134 if (!_snapshot->promote(number_of_classes)) {
135 // failed to promote, means out of memory
136 MemTracker::shutdown(MemTracker::NMT_out_of_memory);
137 }
138 } else {
139 // worker thread is idle
140 worker_idle = true;
141 MemTracker::report_worker_idle();
142 _snapshot->wait(1000);
143 ThreadCritical tc;
144 // check if more data arrived
145 if (!_gen[_head].has_more_recorder()) {
146 _gen[_head].add_recorders(MemTracker::get_pending_recorders());
147 }
148 }
149 }
150 }
151 assert(MemTracker::shutdown_in_progress(), "just check");
152
153 // transits to final shutdown
154 MemTracker::final_shutdown();
155 }
156
157 // at synchronization point, where 'safepoint visible' Java threads are blocked
158 // at a safepoint, and the rest of threads are blocked on ThreadCritical lock.
159 // The caller MemTracker::sync() already takes ThreadCritical before calling this
160 // method.
161 //
162 // Following tasks are performed:
163 // 1. add all recorders in pending queue to current generation
164 // 2. increase generation
165
166 void MemTrackWorker::at_sync_point(MemRecorder* rec, int number_of_classes) {
167 NOT_PRODUCT(_sync_point_count ++;)
168 assert(count_recorder(rec) <= MemRecorder::_instance_count,
169 "pending queue has infinite loop");
170
171 bool out_of_generation_buffer = false;
172 // check shutdown state inside ThreadCritical
173 if (MemTracker::shutdown_in_progress()) return;
174
175 _gen[_tail].set_number_of_classes(number_of_classes);
176 // append the recorders to the end of the generation
177 _gen[_tail].add_recorders(rec);
178 assert(count_recorder(_gen[_tail].peek()) <= MemRecorder::_instance_count,
179 "after add to current generation has infinite loop");
180 // we have collected all recorders for this generation. If there is data,
181 // we need to increment _tail to start a new generation.
182 if (_gen[_tail].has_more_recorder() || _head == _tail) {
183 _tail = (_tail + 1) % MAX_GENERATIONS;
184 out_of_generation_buffer = (_tail == _head);
185 }
186
187 if (out_of_generation_buffer) {
188 MemTracker::shutdown(MemTracker::NMT_out_of_generation);
189 }
190 }
191
192 #ifndef PRODUCT
193 int MemTrackWorker::count_recorder(const MemRecorder* head) {
194 int count = 0;
195 while(head != NULL) {
196 count ++;
197 head = head->next();
198 }
199 return count;
200 }
201
202 int MemTrackWorker::count_pending_recorders() const {
203 int count = 0;
204 for (int index = 0; index < MAX_GENERATIONS; index ++) {
205 MemRecorder* head = _gen[index].peek();
206 if (head != NULL) {
207 count += count_recorder(head);
208 }
209 }
210 return count;
211 }
212 #endif

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