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src/share/vm/gc_implementation/shared/gSpaceCounters.hpp@aaf61e68b255 (annotated)
src/share/vm/gc_implementation/shared/gSpaceCounters.hpp
Mon, 06 Aug 2012 12:20:14 -0700
- author
- johnc
- date
- Mon, 06 Aug 2012 12:20:14 -0700
- changeset 3982
- aaf61e68b255
- parent 3900
- d2a62e0f25eb
- child 4153
- b9a9ed0f8eeb
- permissions
- -rw-r--r--
6818524: G1: use ergonomic resizing of PLABs
Summary: Employ PLABStats instances to record information about survivor and old PLABs, and use the recorded stats to adjust the sizes of survivor and old PLABS.
Reviewed-by: johnc, ysr
Contributed-by: Brandon Mitchell <brandon@twitter.com>
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #ifndef SERIALGC |
| stefank@2314 | 29 | #include "gc_implementation/shared/generationCounters.hpp" |
| stefank@2314 | 30 | #include "memory/generation.hpp" |
| stefank@2314 | 31 | #include "runtime/perfData.hpp" |
| stefank@2314 | 32 | #endif |
| stefank@2314 | 33 | |
| duke@435 | 34 | // A GSpaceCounter is a holder class for performance counters |
| duke@435 | 35 | // that track a space; |
| duke@435 | 36 | |
| zgu@3900 | 37 | class GSpaceCounters: public CHeapObj<mtGC> { |
| duke@435 | 38 | friend class VMStructs; |
| duke@435 | 39 | |
| duke@435 | 40 | private: |
| duke@435 | 41 | PerfVariable* _capacity; |
| duke@435 | 42 | PerfVariable* _used; |
| duke@435 | 43 | |
| duke@435 | 44 | // Constant PerfData types don't need to retain a reference. |
| duke@435 | 45 | // However, it's a good idea to document them here. |
| duke@435 | 46 | // PerfConstant* _size; |
| duke@435 | 47 | |
| duke@435 | 48 | Generation* _gen; |
| duke@435 | 49 | char* _name_space; |
| duke@435 | 50 | |
| duke@435 | 51 | public: |
| duke@435 | 52 | |
| duke@435 | 53 | GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g, |
| duke@435 | 54 | GenerationCounters* gc, bool sampled=true); |
| duke@435 | 55 | |
| duke@435 | 56 | ~GSpaceCounters() { |
| zgu@3900 | 57 | if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC); |
| duke@435 | 58 | } |
| duke@435 | 59 | |
| duke@435 | 60 | inline void update_capacity() { |
| duke@435 | 61 | _capacity->set_value(_gen->capacity()); |
| duke@435 | 62 | } |
| duke@435 | 63 | |
| duke@435 | 64 | inline void update_used() { |
| duke@435 | 65 | _used->set_value(_gen->used()); |
| duke@435 | 66 | } |
| duke@435 | 67 | |
| duke@435 | 68 | // special version of update_used() to allow the used value to be |
| duke@435 | 69 | // passed as a parameter. This method can can be used in cases were |
| duke@435 | 70 | // the utilization is already known and/or when the _gen->used() |
| duke@435 | 71 | // method is known to be expensive and we want to avoid unnecessary |
| duke@435 | 72 | // calls to it. |
| duke@435 | 73 | // |
| duke@435 | 74 | inline void update_used(size_t used) { |
| duke@435 | 75 | _used->set_value(used); |
| duke@435 | 76 | } |
| duke@435 | 77 | |
| duke@435 | 78 | inline void inc_used(size_t size) { |
| duke@435 | 79 | _used->inc(size); |
| duke@435 | 80 | } |
| duke@435 | 81 | |
| duke@435 | 82 | debug_only( |
| duke@435 | 83 | // for security reasons, we do not allow arbitrary reads from |
| duke@435 | 84 | // the counters as they may live in shared memory. |
| duke@435 | 85 | jlong used() { |
| duke@435 | 86 | return _used->get_value(); |
| duke@435 | 87 | } |
| duke@435 | 88 | jlong capacity() { |
| duke@435 | 89 | return _used->get_value(); |
| duke@435 | 90 | } |
| duke@435 | 91 | ) |
| duke@435 | 92 | |
| duke@435 | 93 | inline void update_all() { |
| duke@435 | 94 | update_used(); |
| duke@435 | 95 | update_capacity(); |
| duke@435 | 96 | } |
| duke@435 | 97 | |
| duke@435 | 98 | const char* name_space() const { return _name_space; } |
| duke@435 | 99 | }; |
| duke@435 | 100 | |
| duke@435 | 101 | class GenerationUsedHelper : public PerfLongSampleHelper { |
| duke@435 | 102 | private: |
| duke@435 | 103 | Generation* _gen; |
| duke@435 | 104 | |
| duke@435 | 105 | public: |
| duke@435 | 106 | GenerationUsedHelper(Generation* g) : _gen(g) { } |
| duke@435 | 107 | |
| duke@435 | 108 | inline jlong take_sample() { |
| duke@435 | 109 | return _gen->used(); |
| duke@435 | 110 | } |
| duke@435 | 111 | }; |
| stefank@2314 | 112 | |
| stefank@2314 | 113 | #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP |
