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annotate src/share/vm/gc_implementation/g1/vm_operations_g1.hpp @ 1656:4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
| author | tonyp |
|---|---|
| date | Mon, 28 Jun 2010 14:13:17 -0400 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 25 // VM_operations for the G1 collector. | |
| 26 // VM_GC_Operation: | |
| 27 // - VM_CGC_Operation | |
| 28 // - VM_G1CollectFull | |
| 29 // - VM_G1CollectForAllocation | |
| 30 // - VM_G1IncCollectionPause | |
| 31 // - VM_G1PopRegionCollectionPause | |
| 32 | |
| 33 class VM_G1CollectFull: public VM_GC_Operation { | |
| 34 public: | |
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35 VM_G1CollectFull(unsigned int gc_count_before, |
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36 unsigned int full_gc_count_before, |
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37 GCCause::Cause cause) |
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38 : VM_GC_Operation(gc_count_before, full_gc_count_before) { |
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39 _gc_cause = cause; |
| 342 | 40 } |
| 41 ~VM_G1CollectFull() {} | |
| 42 virtual VMOp_Type type() const { return VMOp_G1CollectFull; } | |
| 43 virtual void doit(); | |
| 44 virtual const char* name() const { | |
| 45 return "full garbage-first collection"; | |
| 46 } | |
| 47 }; | |
| 48 | |
| 49 class VM_G1CollectForAllocation: public VM_GC_Operation { | |
| 50 private: | |
| 51 HeapWord* _res; | |
| 52 size_t _size; // size of object to be allocated | |
| 53 public: | |
| 54 VM_G1CollectForAllocation(size_t size, int gc_count_before) | |
| 55 : VM_GC_Operation(gc_count_before) { | |
| 56 _size = size; | |
| 57 _res = NULL; | |
| 58 } | |
| 59 ~VM_G1CollectForAllocation() {} | |
| 60 virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; } | |
| 61 virtual void doit(); | |
| 62 virtual const char* name() const { | |
| 63 return "garbage-first collection to satisfy allocation"; | |
| 64 } | |
| 65 HeapWord* result() { return _res; } | |
| 66 }; | |
| 67 | |
| 68 class VM_G1IncCollectionPause: public VM_GC_Operation { | |
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69 private: |
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70 bool _should_initiate_conc_mark; |
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71 double _target_pause_time_ms; |
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72 unsigned int _full_collections_completed_before; |
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73 public: |
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74 VM_G1IncCollectionPause(unsigned int gc_count_before, |
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75 bool should_initiate_conc_mark, |
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76 double target_pause_time_ms, |
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77 GCCause::Cause cause) |
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78 : VM_GC_Operation(gc_count_before), |
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79 _full_collections_completed_before(0), |
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80 _should_initiate_conc_mark(should_initiate_conc_mark), |
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81 _target_pause_time_ms(target_pause_time_ms) { |
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82 guarantee(target_pause_time_ms > 0.0, |
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83 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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84 target_pause_time_ms)); |
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85 |
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86 _gc_cause = cause; |
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87 } |
| 342 | 88 virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; } |
| 89 virtual void doit(); | |
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90 virtual void doit_epilogue(); |
| 342 | 91 virtual const char* name() const { |
| 92 return "garbage-first incremental collection pause"; | |
| 93 } | |
| 94 }; | |
| 95 | |
| 96 // Concurrent GC stop-the-world operations such as initial and final mark; | |
| 97 // consider sharing these with CMS's counterparts. | |
| 98 class VM_CGC_Operation: public VM_Operation { | |
| 99 VoidClosure* _cl; | |
| 100 const char* _printGCMessage; | |
| 101 public: | |
| 102 VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) : | |
| 103 _cl(cl), | |
| 104 _printGCMessage(printGCMsg) | |
| 105 {} | |
| 106 | |
| 107 ~VM_CGC_Operation() {} | |
| 108 | |
| 109 virtual VMOp_Type type() const { return VMOp_CGC_Operation; } | |
| 110 virtual void doit(); | |
| 111 virtual bool doit_prologue(); | |
| 112 virtual void doit_epilogue(); | |
| 113 virtual const char* name() const { | |
| 114 return "concurrent gc"; | |
| 115 } | |
| 116 }; |