Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp @ 3285:49a67202bc67
7011855: G1: non-product flag to artificially grow the heap
Summary: It introduces non-product cmd line parameter G1DummyRegionsPerGC which indicates how many "dummy" regions to allocate at the end of each GC. This allows the G1 heap to grow artificially and makes concurrent marking cycles more frequent irrespective of what the application that is running is doing. The dummy regions will be found totally empty during cleanup so this parameter can also be used to stress the concurrent cleanup operation.
Reviewed-by: brutisso, johnc
| author | tonyp |
|---|---|
| date | Tue, 19 Apr 2011 15:46:59 -0400 |
| parents | f95d63e2154a |
| children | 9f059abe8cf2 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2007, 2010, 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 |
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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP | |
| 27 | |
| 28 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" | |
| 29 #include "memory/permGen.hpp" | |
| 30 | |
| 0 | 31 class CardTableRS; // fwd decl |
| 32 class ConcurrentMarkSweepGeneration; | |
| 33 | |
| 34 // A PermGen implemented with a CMS space, collected by a CMS collector. | |
| 35 class CMSPermGen: public PermGen { | |
| 36 friend class VMStructs; | |
| 37 | |
| 38 protected: | |
| 39 // The "generation" view. | |
| 40 ConcurrentMarkSweepGeneration* _gen; | |
| 41 | |
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42 // Override default implementation from PermGen |
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43 virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size, |
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44 GCCause::Cause prev_cause); |
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45 |
| 0 | 46 public: |
| 47 CMSPermGen(ReservedSpace rs, size_t initial_byte_size, | |
| 48 CardTableRS* ct, FreeBlockDictionary::DictionaryChoice); | |
| 49 | |
| 50 HeapWord* mem_allocate(size_t size); | |
| 51 | |
| 52 void compute_new_size(); | |
| 53 | |
| 54 Generation* as_gen() const { return _gen; } | |
| 55 }; | |
| 56 | |
| 57 // This is the "generation" view of a CMSPermGen. | |
| 58 class CMSPermGenGen: public ConcurrentMarkSweepGeneration { | |
| 59 // Abstractly, this is a subtype that gets access to protected fields. | |
| 60 friend class CMSPermGen; | |
| 61 public: | |
| 62 CMSPermGenGen(ReservedSpace rs, size_t initial_byte_size, | |
| 63 int level, CardTableRS* ct): | |
| 64 // See comments in the constructor for CompactibleFreeListSpace | |
| 65 // regarding not using adaptive free lists for a perm gen. | |
| 66 ConcurrentMarkSweepGeneration(rs, initial_byte_size, // MinPermHeapExapnsion | |
| 67 level, ct, false /* use adaptive freelists */, | |
| 68 (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice) | |
| 69 {} | |
| 70 | |
| 71 void initialize_performance_counters(); | |
| 72 | |
| 73 const char* name() const { | |
| 74 return "concurrent-mark-sweep perm gen"; | |
| 75 } | |
| 76 | |
| 77 const char* short_name() const { | |
| 78 return "CMS Perm"; | |
| 79 } | |
| 80 | |
| 81 bool must_be_youngest() const { return false; } | |
| 82 bool must_be_oldest() const { return false; } | |
| 83 }; | |
| 1972 | 84 |
| 85 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSPERMGEN_HPP |