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comparison src/share/vm/services/memTrackWorker.cpp @ 6197:d2a62e0f25eb

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6995781: Native Memory Tracking (Phase 1) 7151532: DCmd for hotspot native memory tracking Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd Reviewed-by: acorn, coleenp, fparain
author zgu
date Thu, 28 Jun 2012 17:03:16 -0400
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children 4acebbe310e1
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6174:74533f63b116 6197:d2a62e0f25eb
1 /*
2 * Copyright (c) 2012, 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 MemTrackWorker::MemTrackWorker() {
33 // create thread uses cgc thread type for now. We should revisit
34 // the option, or create new thread type.
35 _has_error = !os::create_thread(this, os::cgc_thread);
36 set_name("MemTrackWorker", 0);
37
38 // initial generation circuit buffer
39 if (!has_error()) {
40 _head = _tail = 0;
41 for(int index = 0; index < MAX_GENERATIONS; index ++) {
42 _gen[index] = NULL;
43 }
44 }
45 NOT_PRODUCT(_sync_point_count = 0;)
46 NOT_PRODUCT(_merge_count = 0;)
47 NOT_PRODUCT(_last_gen_in_use = 0;)
48 }
49
50 MemTrackWorker::~MemTrackWorker() {
51 for (int index = 0; index < MAX_GENERATIONS; index ++) {
52 MemRecorder* rc = _gen[index];
53 if (rc != NULL) {
54 delete rc;
55 }
56 }
57 }
58
59 void* MemTrackWorker::operator new(size_t size) {
60 assert(false, "use nothrow version");
61 return NULL;
62 }
63
64 void* MemTrackWorker::operator new(size_t size, const std::nothrow_t& nothrow_constant) {
65 return allocate(size, false, mtNMT);
66 }
67
68 void MemTrackWorker::start() {
69 os::start_thread(this);
70 }
71
72 /*
73 * Native memory tracking worker thread loop:
74 * 1. merge one generation of memory recorders to staging area
75 * 2. promote staging data to memory snapshot
76 *
77 * This thread can run through safepoint.
78 */
79
80 void MemTrackWorker::run() {
81 assert(MemTracker::is_on(), "native memory tracking is off");
82 this->initialize_thread_local_storage();
83 this->record_stack_base_and_size();
84 MemSnapshot* snapshot = MemTracker::get_snapshot();
85 assert(snapshot != NULL, "Worker should not be started");
86 MemRecorder* rec;
87
88 while (!MemTracker::shutdown_in_progress()) {
89 NOT_PRODUCT(_last_gen_in_use = generations_in_use();)
90 {
91 // take a recorder from earliest generation in buffer
92 ThreadCritical tc;
93 rec = _gen[_head];
94 if (rec != NULL) {
95 _gen[_head] = rec->next();
96 }
97 assert(count_recorder(_gen[_head]) <= MemRecorder::_instance_count,
98 "infinite loop after dequeue");
99 }
100 if (rec != NULL) {
101 // merge the recorder into staging area
102 bool result = snapshot->merge(rec);
103 assert(result, "merge failed");
104 debug_only(_merge_count ++;)
105 MemTracker::release_thread_recorder(rec);
106 } else {
107 // no more recorder to merge, promote staging area
108 // to snapshot
109 if (_head != _tail) {
110 {
111 ThreadCritical tc;
112 if (_gen[_head] != NULL || _head == _tail) {
113 continue;
114 }
115 // done with this generation, increment _head pointer
116 _head = (_head + 1) % MAX_GENERATIONS;
117 }
118 // promote this generation data to snapshot
119 snapshot->promote();
120 } else {
121 snapshot->wait(1000);
122 ThreadCritical tc;
123 // check if more data arrived
124 if (_gen[_head] == NULL) {
125 _gen[_head] = MemTracker::get_pending_recorders();
126 }
127 }
128 }
129 }
130 assert(MemTracker::shutdown_in_progress(), "just check");
131
132 // transites to final shutdown
133 MemTracker::final_shutdown();
134 }
135
136 // at synchronization point, where 'safepoint visible' Java threads are blocked
137 // at a safepoint, and the rest of threads are blocked on ThreadCritical lock.
138 // The caller MemTracker::sync() already takes ThreadCritical before calling this
139 // method.
140 //
141 // Following tasks are performed:
142 // 1. add all recorders in pending queue to current generation
143 // 2. increase generation
144
145 void MemTrackWorker::at_sync_point(MemRecorder* rec) {
146 NOT_PRODUCT(_sync_point_count ++;)
147 assert(count_recorder(rec) <= MemRecorder::_instance_count,
148 "pending queue has infinite loop");
149
150 bool out_of_generation_buffer = false;
151 // check shutdown state inside ThreadCritical
152 if (MemTracker::shutdown_in_progress()) return;
153 // append the recorders to the end of the generation
154 if( rec != NULL) {
155 MemRecorder* cur_head = _gen[_tail];
156 if (cur_head == NULL) {
157 _gen[_tail] = rec;
158 } else {
159 while (cur_head->next() != NULL) {
160 cur_head = cur_head->next();
161 }
162 cur_head->set_next(rec);
163 }
164 }
165 assert(count_recorder(rec) <= MemRecorder::_instance_count,
166 "after add to current generation has infinite loop");
167 // we have collected all recorders for this generation. If there is data,
168 // we need to increment _tail to start a new generation.
169 if (_gen[_tail] != NULL || _head == _tail) {
170 _tail = (_tail + 1) % MAX_GENERATIONS;
171 out_of_generation_buffer = (_tail == _head);
172 }
173
174 if (out_of_generation_buffer) {
175 MemTracker::shutdown(MemTracker::NMT_out_of_generation);
176 }
177 }
178
179 #ifndef PRODUCT
180 int MemTrackWorker::count_recorder(const MemRecorder* head) {
181 int count = 0;
182 while(head != NULL) {
183 count ++;
184 head = head->next();
185 }
186 return count;
187 }
188
189 int MemTrackWorker::count_pending_recorders() const {
190 int count = 0;
191 for (int index = 0; index < MAX_GENERATIONS; index ++) {
192 MemRecorder* head = _gen[index];
193 if (head != NULL) {
194 count += count_recorder(head);
195 }
196 }
197 return count;
198 }
199 #endif