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comparison: src/share/vm/runtime/interfaceSupport.cpp

src/share/vm/runtime/interfaceSupport.cpp

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1 /*
2 * Copyright (c) 1997, 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 "gc_implementation/shared/markSweep.hpp"
27 #include "gc_interface/collectedHeap.hpp"
28 #include "gc_interface/collectedHeap.inline.hpp"
29 #include "memory/genCollectedHeap.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "runtime/init.hpp"
32 #include "runtime/interfaceSupport.hpp"
33 #include "runtime/threadLocalStorage.hpp"
34 #include "runtime/vframe.hpp"
35 #include "utilities/preserveException.hpp"
36
37 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
38
39 // Implementation of InterfaceSupport
40
41 #ifdef ASSERT
42
43 long InterfaceSupport::_number_of_calls = 0;
44 long InterfaceSupport::_scavenge_alot_counter = 1;
45 long InterfaceSupport::_fullgc_alot_counter = 1;
46 long InterfaceSupport::_fullgc_alot_invocation = 0;
47
48 Histogram* RuntimeHistogram;
49
50 RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
51 static volatile jint RuntimeHistogram_lock = 0;
52 _name = elementName;
53 uintx count = 0;
54
55 while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
56 while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
57 count +=1;
58 if ( (WarnOnStalledSpinLock > 0)
59 && (count % WarnOnStalledSpinLock == 0)) {
60 warning("RuntimeHistogram_lock seems to be stalled");
61 }
62 }
63 }
64
65 if (RuntimeHistogram == NULL) {
66 RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
67 }
68
69 RuntimeHistogram->add_element(this);
70 Atomic::dec(&RuntimeHistogram_lock);
71 }
72
73 void InterfaceSupport::trace(const char* result_type, const char* header) {
74 tty->print_cr("%6d %s", _number_of_calls, header);
75 }
76
77 void InterfaceSupport::gc_alot() {
78 Thread *thread = Thread::current();
79 if (!thread->is_Java_thread()) return; // Avoid concurrent calls
80 // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
81 JavaThread *current_thread = (JavaThread *)thread;
82 if (current_thread->active_handles() == NULL) return;
83
84 // Short-circuit any possible re-entrant gc-a-lot attempt
85 if (thread->skip_gcalot()) return;
86
87 if (is_init_completed()) {
88
89 if (++_fullgc_alot_invocation < FullGCALotStart) {
90 return;
91 }
92
93 // Use this line if you want to block at a specific point,
94 // e.g. one number_of_calls/scavenge/gc before you got into problems
95 if (FullGCALot) _fullgc_alot_counter--;
96
97 // Check if we should force a full gc
98 if (_fullgc_alot_counter == 0) {
99 // Release dummy so objects are forced to move
100 if (!Universe::release_fullgc_alot_dummy()) {
101 warning("FullGCALot: Unable to release more dummies at bottom of heap");
102 }
103 HandleMark hm(thread);
104 Universe::heap()->collect(GCCause::_full_gc_alot);
105 unsigned int invocations = Universe::heap()->total_full_collections();
106 // Compute new interval
107 if (FullGCALotInterval > 1) {
108 _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
109 if (PrintGCDetails && Verbose) {
110 tty->print_cr("Full gc no: %u\tInterval: %d", invocations,
111 _fullgc_alot_counter);
112 }
113 } else {
114 _fullgc_alot_counter = 1;
115 }
116 // Print progress message
117 if (invocations % 100 == 0) {
118 if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
119 }
120 } else {
121 if (ScavengeALot) _scavenge_alot_counter--;
122 // Check if we should force a scavenge
123 if (_scavenge_alot_counter == 0) {
124 HandleMark hm(thread);
125 Universe::heap()->collect(GCCause::_scavenge_alot);
126 unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
127 // Compute new interval
128 if (ScavengeALotInterval > 1) {
129 _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
130 if (PrintGCDetails && Verbose) {
131 tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,
132 _scavenge_alot_counter);
133 }
134 } else {
135 _scavenge_alot_counter = 1;
136 }
137 // Print progress message
138 if (invocations % 1000 == 0) {
139 if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
140 }
141 }
142 }
143 }
144 }
145
146
147 vframe* vframe_array[50];
148 int walk_stack_counter = 0;
149
150 void InterfaceSupport::walk_stack_from(vframe* start_vf) {
151 // walk
152 int i = 0;
153 for (vframe* f = start_vf; f; f = f->sender() ) {
154 if (i < 50) vframe_array[i++] = f;
155 }
156 }
157
158
159 void InterfaceSupport::walk_stack() {
160 JavaThread* thread = JavaThread::current();
161 walk_stack_counter++;
162 if (!thread->has_last_Java_frame()) return;
163 ResourceMark rm(thread);
164 RegisterMap reg_map(thread);
165 walk_stack_from(thread->last_java_vframe(&reg_map));
166 }
167
168
169 # ifdef ENABLE_ZAP_DEAD_LOCALS
170
171 static int zap_traversals = 0;
172
173 void InterfaceSupport::zap_dead_locals_old() {
174 JavaThread* thread = JavaThread::current();
175 if (zap_traversals == -1) // edit constant for debugging
176 warning("I am here");
177 int zap_frame_count = 0; // count frames to help debugging
178 for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {
179 sfs.current()->zap_dead_locals(thread, sfs.register_map());
180 ++zap_frame_count;
181 }
182 ++zap_traversals;
183 }
184
185 # endif
186
187
188 int deoptimizeAllCounter = 0;
189 int zombieAllCounter = 0;
190
191
192 void InterfaceSupport::zombieAll() {
193 if (is_init_completed() && zombieAllCounter > ZombieALotInterval) {
194 zombieAllCounter = 0;
195 VM_ZombieAll op;
196 VMThread::execute(&op);
197 } else {
198 zombieAllCounter++;
199 }
200 }
201
202 void InterfaceSupport::unlinkSymbols() {
203 VM_UnlinkSymbols op;
204 VMThread::execute(&op);
205 }
206
207 void InterfaceSupport::deoptimizeAll() {
208 if (is_init_completed() ) {
209 if (DeoptimizeALot && deoptimizeAllCounter > DeoptimizeALotInterval) {
210 deoptimizeAllCounter = 0;
211 VM_DeoptimizeAll op;
212 VMThread::execute(&op);
213 } else if (DeoptimizeRandom && (deoptimizeAllCounter & 0x1f) == (os::random() & 0x1f)) {
214 VM_DeoptimizeAll op;
215 VMThread::execute(&op);
216 }
217 }
218 deoptimizeAllCounter++;
219 }
220
221
222 void InterfaceSupport::stress_derived_pointers() {
223 #ifdef COMPILER2
224 JavaThread *thread = JavaThread::current();
225 if (!is_init_completed()) return;
226 ResourceMark rm(thread);
227 bool found = false;
228 for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
229 CodeBlob* cb = sfs.current()->cb();
230 if (cb != NULL && cb->oop_maps() ) {
231 // Find oopmap for current method
232 OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
233 assert(map != NULL, "no oopmap found for pc");
234 found = map->has_derived_pointer();
235 }
236 }
237 if (found) {
238 // $$$ Not sure what to do here.
239 /*
240 Scavenge::invoke(0);
241 */
242 }
243 #endif
244 }
245
246
247 void InterfaceSupport::verify_stack() {
248 JavaThread* thread = JavaThread::current();
249 ResourceMark rm(thread);
250 // disabled because it throws warnings that oop maps should only be accessed
251 // in VM thread or during debugging
252
253 if (!thread->has_pending_exception()) {
254 // verification does not work if there are pending exceptions
255 StackFrameStream sfs(thread);
256 CodeBlob* cb = sfs.current()->cb();
257 // In case of exceptions we might not have a runtime_stub on
258 // top of stack, hence, all callee-saved registers are not going
259 // to be setup correctly, hence, we cannot do stack verify
260 if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
261
262 for (; !sfs.is_done(); sfs.next()) {
263 sfs.current()->verify(sfs.register_map());
264 }
265 }
266 }
267
268
269 void InterfaceSupport::verify_last_frame() {
270 JavaThread* thread = JavaThread::current();
271 ResourceMark rm(thread);
272 RegisterMap reg_map(thread);
273 frame fr = thread->last_frame();
274 fr.verify(&reg_map);
275 }
276
277
278 #endif // ASSERT
279
280
281 void InterfaceSupport_init() {
282 #ifdef ASSERT
283 if (ScavengeALot || FullGCALot) {
284 srand(ScavengeALotInterval * FullGCALotInterval);
285 }
286 #endif
287 }

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