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comparison src/share/vm/memory/permGen.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c0492d52d55b
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 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
25 #include "incls/_precompiled.incl"
26 #include "incls/_permGen.cpp.incl"
27
28 CompactingPermGen::CompactingPermGen(ReservedSpace rs,
29 ReservedSpace shared_rs,
30 size_t initial_byte_size,
31 GenRemSet* remset,
32 PermanentGenerationSpec* perm_spec)
33 {
34 CompactingPermGenGen* g =
35 new CompactingPermGenGen(rs, shared_rs, initial_byte_size, -1, remset,
36 NULL, perm_spec);
37 if (g == NULL)
38 vm_exit_during_initialization("Could not allocate a CompactingPermGen");
39 _gen = g;
40
41 g->initialize_performance_counters();
42
43 _capacity_expansion_limit = g->capacity() + MaxPermHeapExpansion;
44 }
45
46 HeapWord* CompactingPermGen::mem_allocate(size_t size) {
47 MutexLocker ml(Heap_lock);
48 HeapWord* obj = _gen->allocate(size, false);
49 bool tried_collection = false;
50 bool tried_expansion = false;
51 while (obj == NULL) {
52 if (_gen->capacity() >= _capacity_expansion_limit || tried_expansion) {
53 // Expansion limit reached, try collection before expanding further
54 // For now we force a full collection, this could be changed
55 SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
56 obj = _gen->allocate(size, false);
57 tried_collection = true;
58 tried_expansion = false; // ... following the collection:
59 // the collection may have shrunk the space.
60 }
61 if (obj == NULL && !tried_expansion) {
62 obj = _gen->expand_and_allocate(size, false);
63 tried_expansion = true;
64 }
65 if (obj == NULL && tried_collection && tried_expansion) {
66 // We have not been able to allocate despite a collection and
67 // an attempted space expansion. We now make a last-ditch collection
68 // attempt that will try to reclaim as much space as possible (for
69 // example by aggressively clearing all soft refs).
70 SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
71 obj = _gen->allocate(size, false);
72 if (obj == NULL) {
73 // An expansion attempt is necessary since the previous
74 // collection may have shrunk the space.
75 obj = _gen->expand_and_allocate(size, false);
76 }
77 break;
78 }
79 }
80 return obj;
81 }
82
83 void CompactingPermGen::compute_new_size() {
84 size_t desired_capacity = align_size_up(_gen->used(), MinPermHeapExpansion);
85 if (desired_capacity < PermSize) {
86 desired_capacity = PermSize;
87 }
88 if (_gen->capacity() > desired_capacity) {
89 _gen->shrink(_gen->capacity() - desired_capacity);
90 }
91 _capacity_expansion_limit = _gen->capacity() + MaxPermHeapExpansion;
92 }