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annotate src/share/vm/memory/permGen.cpp @ 1839:e41cd7fd68a6

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6794422: Perm gen expansion policy for concurrent collectors Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently. Reviewed-by: johnc
author ysr
date Fri, 01 Oct 2010 16:12:54 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_permGen.cpp.incl"
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27
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28 HeapWord* PermGen::request_expand_and_allocate(Generation* gen, size_t size,
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29 GCCause::Cause prev_cause) {
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30 if (gen->capacity() < _capacity_expansion_limit ||
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31 prev_cause != GCCause::_no_gc || UseG1GC) { // last disjunct is a temporary hack for G1
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32 return gen->expand_and_allocate(size, false);
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33 }
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34 // We have reached the limit of capacity expansion where
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35 // we will not expand further until a GC is done; request denied.
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36 return NULL;
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37 }
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38
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39 HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) {
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40 GCCause::Cause next_cause = GCCause::_permanent_generation_full;
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41 GCCause::Cause prev_cause = GCCause::_no_gc;
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42 unsigned int gc_count_before, full_gc_count_before;
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43 HeapWord* obj;
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45 for (;;) {
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46 {
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47 MutexLocker ml(Heap_lock);
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48 if ((obj = gen->allocate(size, false)) != NULL) {
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49 return obj;
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50 }
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51 // Attempt to expand and allocate the requested space:
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52 // specific subtypes may use specific policy to either expand
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53 // or not. The default policy (see above) is to expand until
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54 // _capacity_expansion_limit, and no further unless a GC is done.
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55 // Concurrent collectors may decide to kick off a concurrent
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56 // collection under appropriate conditions.
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57 obj = request_expand_and_allocate(gen, size, prev_cause);
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58
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59 if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) {
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60 return obj;
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61 }
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62 if (GC_locker::is_active_and_needs_gc()) {
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63 // If this thread is not in a jni critical section, we stall
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64 // the requestor until the critical section has cleared and
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65 // GC allowed. When the critical section clears, a GC is
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66 // initiated by the last thread exiting the critical section; so
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67 // we retry the allocation sequence from the beginning of the loop,
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68 // rather than causing more, now probably unnecessary, GC attempts.
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69 JavaThread* jthr = JavaThread::current();
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70 if (!jthr->in_critical()) {
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71 MutexUnlocker mul(Heap_lock);
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72 // Wait for JNI critical section to be exited
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73 GC_locker::stall_until_clear();
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74 continue;
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75 } else {
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76 if (CheckJNICalls) {
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77 fatal("Possible deadlock due to allocating while"
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78 " in jni critical section");
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79 }
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80 return NULL;
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81 }
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82 }
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83 // Read the GC count while holding the Heap_lock
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84 gc_count_before = SharedHeap::heap()->total_collections();
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85 full_gc_count_before = SharedHeap::heap()->total_full_collections();
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86 }
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87
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88 // Give up heap lock above, VMThread::execute below gets it back
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89 VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before,
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90 next_cause);
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91 VMThread::execute(&op);
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92 if (!op.prologue_succeeded() || op.gc_locked()) {
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93 assert(op.result() == NULL, "must be NULL if gc_locked() is true");
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94 continue; // retry and/or stall as necessary
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95 }
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96 obj = op.result();
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97 assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj),
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98 "result not in heap");
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99 if (obj != NULL) {
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100 return obj;
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101 }
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102 prev_cause = next_cause;
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103 next_cause = GCCause::_last_ditch_collection;
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104 }
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105 }
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106
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107 CompactingPermGen::CompactingPermGen(ReservedSpace rs,
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108 ReservedSpace shared_rs,
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109 size_t initial_byte_size,
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110 GenRemSet* remset,
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111 PermanentGenerationSpec* perm_spec)
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112 {
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113 CompactingPermGenGen* g =
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114 new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset,
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115 NULL, perm_spec);
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116 if (g == NULL)
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117 vm_exit_during_initialization("Could not allocate a CompactingPermGen");
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118 _gen = g;
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119
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120 g->initialize_performance_counters();
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121
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122 _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion;
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123 }
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124
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125 HeapWord* CompactingPermGen::mem_allocate(size_t size) {
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126 return mem_allocate_in_gen(size, _gen);
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127 }
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128
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129 void CompactingPermGen::compute_new_size() {
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130 size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion);
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131 if (desired_capacity < PermSize) {
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132 desired_capacity = PermSize;
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133 }
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134 if (_gen->capacity() > desired_capacity) {
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135 _gen->shrink(_gen->capacity() - desired_capacity);
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136 }
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137 set_capacity_expansion_limit(_gen->capacity() + MaxPermHeapExpansion);
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138 }