|
6197
|
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
|
