Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
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 } |