Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psPermGen.cpp @ 4132:6d7d0790074d
7119584: UseParallelGC barrier task can be overwritten.
Summary: Provoke a GC for a metadata allocation failure.
Reviewed-by: johnc, iveresov
author | jmasa |
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date | Fri, 09 Dec 2011 19:28:34 -0800 |
parents | c9ca3f51cf41 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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 |
c18cbe5936b8
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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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
27 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
28 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
29 #include "gc_implementation/parallelScavenge/psPermGen.hpp" | |
30 #include "gc_implementation/shared/gcUtil.hpp" | |
31 #include "gc_implementation/shared/markSweep.inline.hpp" | |
32 #include "oops/markOop.inline.hpp" | |
0 | 33 |
34 PSPermGen::PSPermGen(ReservedSpace rs, size_t alignment, | |
35 size_t initial_size, size_t min_size, size_t max_size, | |
36 const char* gen_name, int level) : | |
37 PSOldGen(rs, alignment, initial_size, min_size, max_size, gen_name, level), | |
38 _last_used(0) | |
39 { | |
40 assert(object_mark_sweep() != NULL, "Sanity"); | |
41 | |
42 object_mark_sweep()->set_allowed_dead_ratio(PermMarkSweepDeadRatio); | |
43 _avg_size = new AdaptivePaddedAverage(AdaptivePermSizeWeight, | |
44 PermGenPadding); | |
45 } | |
46 | |
47 HeapWord* PSPermGen::allocate_permanent(size_t size) { | |
48 assert_locked_or_safepoint(Heap_lock); | |
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49 HeapWord* obj = allocate_noexpand(size); |
0 | 50 |
51 if (obj == NULL) { | |
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52 obj = expand_and_allocate(size); |
0 | 53 } |
54 | |
55 return obj; | |
56 } | |
57 | |
58 void PSPermGen::compute_new_size(size_t used_before_collection) { | |
59 // Update our padded average of objects allocated in perm | |
60 // gen between collections. | |
61 assert(used_before_collection >= _last_used, | |
62 "negative allocation amount since last GC?"); | |
63 | |
64 const size_t alloc_since_last_gc = used_before_collection - _last_used; | |
65 _avg_size->sample(alloc_since_last_gc); | |
66 | |
67 const size_t current_live = used_in_bytes(); | |
68 // Stash away the current amount live for the next call to this method. | |
69 _last_used = current_live; | |
70 | |
71 // We have different alignment constraints than the rest of the heap. | |
72 const size_t alignment = MAX2(MinPermHeapExpansion, | |
73 virtual_space()->alignment()); | |
74 | |
75 // Compute the desired size: | |
76 // The free space is the newly computed padded average, | |
77 // so the desired size is what's live + the free space. | |
78 size_t desired_size = current_live + (size_t)_avg_size->padded_average(); | |
79 desired_size = align_size_up(desired_size, alignment); | |
80 | |
81 // ...and no larger or smaller than our max and min allowed. | |
82 desired_size = MAX2(MIN2(desired_size, _max_gen_size), _min_gen_size); | |
83 assert(desired_size <= _max_gen_size, "just checking"); | |
84 | |
85 const size_t size_before = _virtual_space->committed_size(); | |
86 | |
87 if (desired_size == size_before) { | |
88 // no change, we're done | |
89 return; | |
90 } | |
91 | |
92 { | |
93 // We'll be growing or shrinking the heap: in either case, | |
94 // we need to hold a lock. | |
95 MutexLocker x(ExpandHeap_lock); | |
96 if (desired_size > size_before) { | |
97 const size_t change_bytes = desired_size - size_before; | |
98 const size_t aligned_change_bytes = | |
99 align_size_up(change_bytes, alignment); | |
100 expand_by(aligned_change_bytes); | |
101 } else { | |
102 // Shrinking | |
103 const size_t change_bytes = | |
104 size_before - desired_size; | |
105 const size_t aligned_change_bytes = align_size_down(change_bytes, alignment); | |
106 shrink(aligned_change_bytes); | |
107 } | |
108 } | |
109 | |
110 // While this code isn't controlled by AdaptiveSizePolicy, it's | |
111 // convenient to see all resizing decsions under the same flag. | |
112 if (PrintAdaptiveSizePolicy) { | |
113 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
114 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
115 | |
116 gclog_or_tty->print_cr("AdaptiveSizePolicy::perm generation size: " | |
117 "collection: %d " | |
118 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
119 heap->total_collections(), | |
120 size_before, _virtual_space->committed_size()); | |
121 } | |
122 } | |
123 | |
124 void PSPermGen::precompact() { | |
125 // Reset start array first. | |
126 _start_array.reset(); | |
127 object_mark_sweep()->precompact(); | |
128 } |