0
|
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 }
|