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comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.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 /*
2 * Copyright (c) 2007 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/_cmsPermGen.cpp.incl"
27
28 CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
29 CardTableRS* ct,
30 FreeBlockDictionary::DictionaryChoice dictionaryChoice) {
31 CMSPermGenGen* g =
32 new CMSPermGenGen(rs, initial_byte_size, -1, ct);
33 if (g == NULL) {
34 vm_exit_during_initialization("Could not allocate a CompactingPermGen");
35 }
36
37 g->initialize_performance_counters();
38
39 _gen = g;
40 }
41
42 HeapWord* CMSPermGen::mem_allocate(size_t size) {
43 Mutex* lock = _gen->freelistLock();
44 bool lock_owned = lock->owned_by_self();
45 if (lock_owned) {
46 MutexUnlocker mul(lock);
47 return mem_allocate_work(size);
48 } else {
49 return mem_allocate_work(size);
50 }
51 }
52
53 HeapWord* CMSPermGen::mem_allocate_work(size_t size) {
54 assert(!_gen->freelistLock()->owned_by_self(), "Potetntial deadlock");
55
56 MutexLocker ml(Heap_lock);
57 HeapWord* obj = NULL;
58
59 obj = _gen->allocate(size, false);
60 // Since we want to minimize pause times, we will prefer
61 // expanding the perm gen rather than doing a stop-world
62 // collection to satisfy the allocation request.
63 if (obj == NULL) {
64 // Try to expand the perm gen and allocate space.
65 obj = _gen->expand_and_allocate(size, false, false);
66 if (obj == NULL) {
67 // Let's see if a normal stop-world full collection will
68 // free up enough space.
69 SharedHeap::heap()->collect_locked(GCCause::_permanent_generation_full);
70 obj = _gen->allocate(size, false);
71 if (obj == NULL) {
72 // The collection above may have shrunk the space, so try
73 // to expand again and allocate space.
74 obj = _gen->expand_and_allocate(size, false, false);
75 }
76 if (obj == NULL) {
77 // We have not been able to allocate space despite a
78 // full stop-world collection. We now make a last-ditch collection
79 // attempt (in which soft refs are all aggressively freed)
80 // that will try to reclaim as much space as possible.
81 SharedHeap::heap()->collect_locked(GCCause::_last_ditch_collection);
82 obj = _gen->allocate(size, false);
83 if (obj == NULL) {
84 // Expand generation in case it was shrunk following the collection.
85 obj = _gen->expand_and_allocate(size, false, false);
86 }
87 }
88 }
89 }
90 return obj;
91 }
92
93 void CMSPermGen::compute_new_size() {
94 _gen->compute_new_size();
95 }
96
97 void CMSPermGenGen::initialize_performance_counters() {
98
99 const char* gen_name = "perm";
100
101 // Generation Counters - generation 2, 1 subspace
102 _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);
103
104 _gc_counters = NULL;
105
106 _space_counters = new GSpaceCounters(gen_name, 0,
107 _virtual_space.reserved_size(),
108 this, _gen_counters);
109 }