Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/shared/gSpaceCounters.hpp @ 10374:87c64c0438fb
6976350: G1: deal with fragmentation while copying objects during GC
Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency.
Reviewed-by: johnc, jmasa, brutisso
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Mon, 03 Jun 2013 14:37:13 -0700 |
| parents | db9981fd3124 |
| children | de6a9e811145 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2002, 2012, 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_SHARED_GSPACECOUNTERS_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP | |
| 27 | |
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28 #include "utilities/macros.hpp" |
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29 #if INCLUDE_ALL_GCS |
| 1972 | 30 #include "gc_implementation/shared/generationCounters.hpp" |
| 31 #include "memory/generation.hpp" | |
| 32 #include "runtime/perfData.hpp" | |
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33 #endif // INCLUDE_ALL_GCS |
| 1972 | 34 |
| 0 | 35 // A GSpaceCounter is a holder class for performance counters |
| 36 // that track a space; | |
| 37 | |
| 6197 | 38 class GSpaceCounters: public CHeapObj<mtGC> { |
| 0 | 39 friend class VMStructs; |
| 40 | |
| 41 private: | |
| 42 PerfVariable* _capacity; | |
| 43 PerfVariable* _used; | |
| 44 | |
| 45 // Constant PerfData types don't need to retain a reference. | |
| 46 // However, it's a good idea to document them here. | |
| 47 // PerfConstant* _size; | |
| 48 | |
| 49 Generation* _gen; | |
| 50 char* _name_space; | |
| 51 | |
| 52 public: | |
| 53 | |
| 54 GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, | |
| 55 GenerationCounters* gc, bool sampled=true); | |
| 56 | |
| 57 ~GSpaceCounters() { | |
| 6197 | 58 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC); |
| 0 | 59 } |
| 60 | |
| 61 inline void update_capacity() { | |
| 62 _capacity->set_value(_gen->capacity()); | |
| 63 } | |
| 64 | |
| 65 inline void update_used() { | |
| 66 _used->set_value(_gen->used()); | |
| 67 } | |
| 68 | |
| 69 // special version of update_used() to allow the used value to be | |
| 70 // passed as a parameter. This method can can be used in cases were | |
| 71 // the utilization is already known and/or when the _gen->used() | |
| 72 // method is known to be expensive and we want to avoid unnecessary | |
| 73 // calls to it. | |
| 74 // | |
| 75 inline void update_used(size_t used) { | |
| 76 _used->set_value(used); | |
| 77 } | |
| 78 | |
| 79 inline void inc_used(size_t size) { | |
| 80 _used->inc(size); | |
| 81 } | |
| 82 | |
| 83 debug_only( | |
| 84 // for security reasons, we do not allow arbitrary reads from | |
| 85 // the counters as they may live in shared memory. | |
| 86 jlong used() { | |
| 87 return _used->get_value(); | |
| 88 } | |
| 89 jlong capacity() { | |
| 90 return _used->get_value(); | |
| 91 } | |
| 92 ) | |
| 93 | |
| 94 inline void update_all() { | |
| 95 update_used(); | |
| 96 update_capacity(); | |
| 97 } | |
| 98 | |
| 99 const char* name_space() const { return _name_space; } | |
| 100 }; | |
| 101 | |
| 102 class GenerationUsedHelper : public PerfLongSampleHelper { | |
| 103 private: | |
| 104 Generation* _gen; | |
| 105 | |
| 106 public: | |
| 107 GenerationUsedHelper(Generation* g) : _gen(g) { } | |
| 108 | |
| 109 inline jlong take_sample() { | |
| 110 return _gen->used(); | |
| 111 } | |
| 112 }; | |
| 1972 | 113 |
| 114 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP |