Mercurial > hg > truffle
annotate src/share/vm/memory/permGen.cpp @ 6147:5ba29a1db46e hs24-b14
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author | amurillo |
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date | Fri, 15 Jun 2012 14:07:00 -0700 |
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2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/shared/cSpaceCounters.hpp" | |
27 #include "gc_implementation/shared/vmGCOperations.hpp" | |
28 #include "gc_interface/collectedHeap.inline.hpp" | |
29 #include "memory/blockOffsetTable.inline.hpp" | |
30 #include "memory/compactPermGen.hpp" | |
31 #include "memory/gcLocker.hpp" | |
32 #include "memory/gcLocker.inline.hpp" | |
33 #include "memory/genCollectedHeap.hpp" | |
34 #include "memory/generation.inline.hpp" | |
35 #include "memory/permGen.hpp" | |
36 #include "memory/universe.hpp" | |
37 #include "oops/oop.inline.hpp" | |
38 #include "runtime/java.hpp" | |
39 #include "runtime/vmThread.hpp" | |
0 | 40 |
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41 HeapWord* PermGen::request_expand_and_allocate(Generation* gen, size_t size, |
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42 GCCause::Cause prev_cause) { |
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43 if (gen->capacity() < _capacity_expansion_limit || |
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44 prev_cause != GCCause::_no_gc || UseG1GC) { // last disjunct is a temporary hack for G1 |
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45 return gen->expand_and_allocate(size, false); |
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46 } |
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47 // We have reached the limit of capacity expansion where |
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48 // we will not expand further until a GC is done; request denied. |
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49 return NULL; |
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50 } |
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51 |
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52 HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) { |
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53 GCCause::Cause next_cause = GCCause::_permanent_generation_full; |
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54 GCCause::Cause prev_cause = GCCause::_no_gc; |
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55 unsigned int gc_count_before, full_gc_count_before; |
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56 HeapWord* obj; |
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57 |
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58 for (;;) { |
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59 { |
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60 MutexLocker ml(Heap_lock); |
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61 if ((obj = gen->allocate(size, false)) != NULL) { |
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62 return obj; |
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63 } |
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64 // Attempt to expand and allocate the requested space: |
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65 // specific subtypes may use specific policy to either expand |
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66 // or not. The default policy (see above) is to expand until |
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67 // _capacity_expansion_limit, and no further unless a GC is done. |
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68 // Concurrent collectors may decide to kick off a concurrent |
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69 // collection under appropriate conditions. |
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70 obj = request_expand_and_allocate(gen, size, prev_cause); |
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71 |
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72 if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) { |
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73 return obj; |
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74 } |
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75 if (GC_locker::is_active_and_needs_gc()) { |
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76 // If this thread is not in a jni critical section, we stall |
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77 // the requestor until the critical section has cleared and |
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78 // GC allowed. When the critical section clears, a GC is |
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79 // initiated by the last thread exiting the critical section; so |
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80 // we retry the allocation sequence from the beginning of the loop, |
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81 // rather than causing more, now probably unnecessary, GC attempts. |
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82 JavaThread* jthr = JavaThread::current(); |
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83 if (!jthr->in_critical()) { |
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84 MutexUnlocker mul(Heap_lock); |
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85 // Wait for JNI critical section to be exited |
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86 GC_locker::stall_until_clear(); |
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87 continue; |
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88 } else { |
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89 if (CheckJNICalls) { |
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90 fatal("Possible deadlock due to allocating while" |
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91 " in jni critical section"); |
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92 } |
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93 return NULL; |
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94 } |
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95 } |
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96 // Read the GC count while holding the Heap_lock |
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97 gc_count_before = SharedHeap::heap()->total_collections(); |
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98 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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99 } |
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100 |
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101 // Give up heap lock above, VMThread::execute below gets it back |
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102 VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before, |
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103 next_cause); |
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104 VMThread::execute(&op); |
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105 if (!op.prologue_succeeded() || op.gc_locked()) { |
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106 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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107 continue; // retry and/or stall as necessary |
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108 } |
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109 obj = op.result(); |
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110 assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj), |
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111 "result not in heap"); |
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112 if (obj != NULL) { |
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113 return obj; |
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114 } |
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115 prev_cause = next_cause; |
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116 next_cause = GCCause::_last_ditch_collection; |
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117 } |
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118 } |
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119 |
0 | 120 CompactingPermGen::CompactingPermGen(ReservedSpace rs, |
121 ReservedSpace shared_rs, | |
122 size_t initial_byte_size, | |
123 GenRemSet* remset, | |
124 PermanentGenerationSpec* perm_spec) | |
125 { | |
126 CompactingPermGenGen* g = | |
127 new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset, | |
128 NULL, perm_spec); | |
129 if (g == NULL) | |
130 vm_exit_during_initialization("Could not allocate a CompactingPermGen"); | |
131 _gen = g; | |
132 | |
133 g->initialize_performance_counters(); | |
134 | |
135 _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion; | |
136 } | |
137 | |
138 HeapWord* CompactingPermGen::mem_allocate(size_t size) { | |
139
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139 return mem_allocate_in_gen(size, _gen); |
0 | 140 } |
141 | |
142 void CompactingPermGen::compute_new_size() { | |
143 size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion); | |
144 if (desired_capacity < PermSize) { | |
145 desired_capacity = PermSize; | |
146 } | |
147 if (_gen->capacity() > desired_capacity) { | |
148 _gen->shrink(_gen->capacity() - desired_capacity); | |
149 } | |
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150 set_capacity_expansion_limit(_gen->capacity() + MaxPermHeapExpansion); |
0 | 151 } |