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annotate src/share/vm/memory/permGen.cpp @ 1764:14197af1010e
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author | never |
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date | Fri, 27 Aug 2010 17:35:08 -0700 |
parents | c18cbe5936b8 |
children | e41cd7fd68a6 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2009, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_permGen.cpp.incl" | |
27 | |
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28 HeapWord* PermGen::mem_allocate_in_gen(size_t size, Generation* gen) { |
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29 GCCause::Cause next_cause = GCCause::_permanent_generation_full; |
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30 GCCause::Cause prev_cause = GCCause::_no_gc; |
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31 unsigned int gc_count_before, full_gc_count_before; |
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32 HeapWord* obj; |
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33 |
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34 for (;;) { |
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35 { |
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36 MutexLocker ml(Heap_lock); |
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37 if ((obj = gen->allocate(size, false)) != NULL) { |
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38 return obj; |
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39 } |
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40 if (gen->capacity() < _capacity_expansion_limit || |
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41 prev_cause != GCCause::_no_gc) { |
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42 obj = gen->expand_and_allocate(size, false); |
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43 } |
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44 if (obj != NULL || prev_cause == GCCause::_last_ditch_collection) { |
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45 return obj; |
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46 } |
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47 if (GC_locker::is_active_and_needs_gc()) { |
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48 // If this thread is not in a jni critical section, we stall |
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49 // the requestor until the critical section has cleared and |
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50 // GC allowed. When the critical section clears, a GC is |
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51 // initiated by the last thread exiting the critical section; so |
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52 // we retry the allocation sequence from the beginning of the loop, |
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53 // rather than causing more, now probably unnecessary, GC attempts. |
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54 JavaThread* jthr = JavaThread::current(); |
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55 if (!jthr->in_critical()) { |
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56 MutexUnlocker mul(Heap_lock); |
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57 // Wait for JNI critical section to be exited |
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58 GC_locker::stall_until_clear(); |
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59 continue; |
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60 } else { |
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61 if (CheckJNICalls) { |
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62 fatal("Possible deadlock due to allocating while" |
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63 " in jni critical section"); |
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64 } |
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65 return NULL; |
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66 } |
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67 } |
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68 // Read the GC count while holding the Heap_lock |
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69 gc_count_before = SharedHeap::heap()->total_collections(); |
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70 full_gc_count_before = SharedHeap::heap()->total_full_collections(); |
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71 } |
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72 |
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73 // Give up heap lock above, VMThread::execute below gets it back |
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74 VM_GenCollectForPermanentAllocation op(size, gc_count_before, full_gc_count_before, |
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75 next_cause); |
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76 VMThread::execute(&op); |
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77 if (!op.prologue_succeeded() || op.gc_locked()) { |
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78 assert(op.result() == NULL, "must be NULL if gc_locked() is true"); |
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79 continue; // retry and/or stall as necessary |
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80 } |
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81 obj = op.result(); |
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82 assert(obj == NULL || SharedHeap::heap()->is_in_reserved(obj), |
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83 "result not in heap"); |
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84 if (obj != NULL) { |
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85 return obj; |
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86 } |
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87 prev_cause = next_cause; |
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88 next_cause = GCCause::_last_ditch_collection; |
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89 } |
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90 } |
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91 |
0 | 92 CompactingPermGen::CompactingPermGen(ReservedSpace rs, |
93 ReservedSpace shared_rs, | |
94 size_t initial_byte_size, | |
95 GenRemSet* remset, | |
96 PermanentGenerationSpec* perm_spec) | |
97 { | |
98 CompactingPermGenGen* g = | |
99 new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset, | |
100 NULL, perm_spec); | |
101 if (g == NULL) | |
102 vm_exit_during_initialization("Could not allocate a CompactingPermGen"); | |
103 _gen = g; | |
104 | |
105 g->initialize_performance_counters(); | |
106 | |
107 _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion; | |
108 } | |
109 | |
110 HeapWord* CompactingPermGen::mem_allocate(size_t size) { | |
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111 return mem_allocate_in_gen(size, _gen); |
0 | 112 } |
113 | |
114 void CompactingPermGen::compute_new_size() { | |
115 size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion); | |
116 if (desired_capacity < PermSize) { | |
117 desired_capacity = PermSize; | |
118 } | |
119 if (_gen->capacity() > desired_capacity) { | |
120 _gen->shrink(_gen->capacity() - desired_capacity); | |
121 } | |
122 _capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion; | |
123 } |