Mercurial > hg > graal-compiler

comparison src/share/vm/gc_implementation/shared/vmGCOperations.cpp @ 0:a61af66fc99e jdk7-b24

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c0492d52d55b
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24 # include "incls/_precompiled.incl"
25 # include "incls/_vmGCOperations.cpp.incl"
26
27 HS_DTRACE_PROBE_DECL1(hotspot, gc__begin, bool);
28 HS_DTRACE_PROBE_DECL(hotspot, gc__end);
29
30 // The same dtrace probe can't be inserted in two different files, so we
31 // have to call it here, so it's only in one file. Can't create new probes
32 // for the other file anymore. The dtrace probes have to remain stable.
33 void VM_GC_Operation::notify_gc_begin(bool full) {
34 HS_DTRACE_PROBE1(hotspot, gc__begin, full);
35 }
36
37 void VM_GC_Operation::notify_gc_end() {
38 HS_DTRACE_PROBE(hotspot, gc__end);
39 }
40
41 void VM_GC_Operation::acquire_pending_list_lock() {
42 // we may enter this with pending exception set
43 instanceRefKlass::acquire_pending_list_lock(&_pending_list_basic_lock);
44 }
45
46
47 void VM_GC_Operation::release_and_notify_pending_list_lock() {
48
49 instanceRefKlass::release_and_notify_pending_list_lock(&_pending_list_basic_lock);
50 }
51
52 // Allocations may fail in several threads at about the same time,
53 // resulting in multiple gc requests. We only want to do one of them.
54 // In case a GC locker is active and the need for a GC is already signalled,
55 // we want to skip this GC attempt altogether, without doing a futile
56 // safepoint operation.
57 bool VM_GC_Operation::skip_operation() const {
58 bool skip = (_gc_count_before != Universe::heap()->total_collections());
59 if (_full && skip) {
60 skip = (_full_gc_count_before != Universe::heap()->total_full_collections());
61 }
62 if (!skip && GC_locker::is_active_and_needs_gc()) {
63 skip = Universe::heap()->is_maximal_no_gc();
64 assert(!(skip && (_gc_cause == GCCause::_gc_locker)),
65 "GC_locker cannot be active when initiating GC");
66 }
67 return skip;
68 }
69
70 bool VM_GC_Operation::doit_prologue() {
71 assert(Thread::current()->is_Java_thread(), "just checking");
72
73 acquire_pending_list_lock();
74 // If the GC count has changed someone beat us to the collection
75 // Get the Heap_lock after the pending_list_lock.
76 Heap_lock->lock();
77 // Check invocations
78 if (skip_operation()) {
79 // skip collection
80 Heap_lock->unlock();
81 release_and_notify_pending_list_lock();
82 _prologue_succeeded = false;
83 } else {
84 _prologue_succeeded = true;
85 }
86 return _prologue_succeeded;
87 }
88
89
90 void VM_GC_Operation::doit_epilogue() {
91 assert(Thread::current()->is_Java_thread(), "just checking");
92 // Release the Heap_lock first.
93 Heap_lock->unlock();
94 release_and_notify_pending_list_lock();
95 }
96
97 bool VM_GC_HeapInspection::doit_prologue() {
98 if (Universe::heap()->supports_heap_inspection()) {
99 return VM_GC_Operation::doit_prologue();
100 } else {
101 return false;
102 }
103 }
104
105 bool VM_GC_HeapInspection::skip_operation() const {
106 assert(Universe::heap()->supports_heap_inspection(), "huh?");
107 return false;
108 }
109
110 void VM_GC_HeapInspection::doit() {
111 HandleMark hm;
112 CollectedHeap* ch = Universe::heap();
113 if (_full_gc) {
114 ch->collect_as_vm_thread(GCCause::_heap_inspection);
115 } else {
116 // make the heap parsable (no need to retire TLABs)
117 ch->ensure_parsability(false);
118 }
119 HeapInspection::heap_inspection(_out);
120 }
121
122
123 void VM_GenCollectForAllocation::doit() {
124 JvmtiGCForAllocationMarker jgcm;
125 notify_gc_begin(false);
126
127 GenCollectedHeap* gch = GenCollectedHeap::heap();
128 GCCauseSetter gccs(gch, _gc_cause);
129 _res = gch->satisfy_failed_allocation(_size, _tlab);
130 assert(gch->is_in_reserved_or_null(_res), "result not in heap");
131
132 if (_res == NULL && GC_locker::is_active_and_needs_gc()) {
133 set_gc_locked();
134 }
135 notify_gc_end();
136 }
137
138 void VM_GenCollectFull::doit() {
139 JvmtiGCFullMarker jgcm;
140 notify_gc_begin(true);
141
142 GenCollectedHeap* gch = GenCollectedHeap::heap();
143 GCCauseSetter gccs(gch, _gc_cause);
144 gch->do_full_collection(gch->must_clear_all_soft_refs(), _max_level);
145 notify_gc_end();
146 }