1 /* 2 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 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: 35 VM_G1CollectFull(unsigned int gc_count_before, 36 unsigned int full_gc_count_before, 37 GCCause::Cause cause) 38 : VM_GC_Operation(gc_count_before, full_gc_count_before) { 39 _gc_cause = cause; 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 { 69 private: 70 bool _should_initiate_conc_mark; 71 double _target_pause_time_ms; 72 unsigned int _full_collections_completed_before; 73 public: 74 VM_G1IncCollectionPause(unsigned int gc_count_before, 75 bool should_initiate_conc_mark, 76 double target_pause_time_ms, 77 GCCause::Cause cause) 78 : VM_GC_Operation(gc_count_before), 79 _full_collections_completed_before(0), 80 _should_initiate_conc_mark(should_initiate_conc_mark), 81 _target_pause_time_ms(target_pause_time_ms) { 82 guarantee(target_pause_time_ms > 0.0, 83 err_msg("target_pause_time_ms = %1.6lf should be positive", 84 target_pause_time_ms)); 85 86 _gc_cause = cause; 87 } 88 virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; } 89 virtual void doit(); 90 virtual void doit_epilogue(); 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 };