Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 8733:9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().
Reviewed-by: johnc, ysr
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Tue, 05 Mar 2013 15:36:56 -0800 |
| parents | d2a62e0f25eb |
| children | b0d20fa374b4 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP | |
| 27 | |
| 342 | 28 class HeapRegion; |
| 29 class HeapRegionClosure; | |
| 3766 | 30 class FreeRegionList; |
| 31 | |
| 32 // This class keeps track of the region metadata (i.e., HeapRegion | |
| 33 // instances). They are kept in the _regions array in address | |
| 34 // order. A region's index in the array corresponds to its index in | |
| 35 // the heap (i.e., 0 is the region at the bottom of the heap, 1 is | |
| 36 // the one after it, etc.). Two regions that are consecutive in the | |
| 37 // array should also be adjacent in the address space (i.e., | |
| 38 // region(i).end() == region(i+1).bottom(). | |
| 39 // | |
| 40 // We create a HeapRegion when we commit the region's address space | |
| 41 // for the first time. When we uncommit the address space of a | |
| 42 // region we retain the HeapRegion to be able to re-use it in the | |
| 43 // future (in case we recommit it). | |
| 44 // | |
| 45 // We keep track of three lengths: | |
| 46 // | |
| 47 // * _length (returned by length()) is the number of currently | |
| 48 // committed regions. | |
| 49 // * _allocated_length (not exposed outside this class) is the | |
| 50 // number of regions for which we have HeapRegions. | |
| 51 // * _max_length (returned by max_length()) is the maximum number of | |
| 52 // regions the heap can have. | |
| 53 // | |
| 54 // and maintain that: _length <= _allocated_length <= _max_length | |
| 342 | 55 |
| 6197 | 56 class HeapRegionSeq: public CHeapObj<mtGC> { |
| 3972 | 57 friend class VMStructs; |
| 342 | 58 |
| 3766 | 59 // The array that holds the HeapRegions. |
| 60 HeapRegion** _regions; | |
| 61 | |
| 62 // Version of _regions biased to address 0 | |
| 63 HeapRegion** _regions_biased; | |
| 64 | |
| 65 // The number of regions committed in the heap. | |
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66 uint _length; |
| 342 | 67 |
| 3766 | 68 // The address of the first reserved word in the heap. |
| 69 HeapWord* _heap_bottom; | |
| 70 | |
| 71 // The address of the last reserved word in the heap - 1. | |
| 72 HeapWord* _heap_end; | |
| 73 | |
| 74 // The log of the region byte size. | |
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75 uint _region_shift; |
| 3766 | 76 |
| 77 // A hint for which index to start searching from for humongous | |
| 78 // allocations. | |
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79 uint _next_search_index; |
| 342 | 80 |
| 3766 | 81 // The number of regions for which we have allocated HeapRegions for. |
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82 uint _allocated_length; |
| 3766 | 83 |
| 84 // The maximum number of regions in the heap. | |
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85 uint _max_length; |
| 3766 | 86 |
| 87 // Find a contiguous set of empty regions of length num, starting | |
| 88 // from the given index. | |
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89 uint find_contiguous_from(uint from, uint num); |
| 342 | 90 |
| 3766 | 91 // Map a heap address to a biased region index. Assume that the |
| 92 // address is valid. | |
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93 inline uintx addr_to_index_biased(HeapWord* addr) const; |
| 342 | 94 |
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95 void increment_length(uint* length) { |
| 3766 | 96 assert(*length < _max_length, "pre-condition"); |
| 97 *length += 1; | |
| 98 } | |
| 99 | |
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100 void decrement_length(uint* length) { |
| 3766 | 101 assert(*length > 0, "pre-condition"); |
| 102 *length -= 1; | |
| 103 } | |
| 342 | 104 |
| 105 public: | |
| 3766 | 106 // Empty contructor, we'll initialize it with the initialize() method. |
| 107 HeapRegionSeq() { } | |
| 108 | |
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109 void initialize(HeapWord* bottom, HeapWord* end, uint max_length); |
| 342 | 110 |
| 3766 | 111 // Return the HeapRegion at the given index. Assume that the index |
| 112 // is valid. | |
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113 inline HeapRegion* at(uint index) const; |
| 3766 | 114 |
| 115 // If addr is within the committed space return its corresponding | |
| 116 // HeapRegion, otherwise return NULL. | |
| 117 inline HeapRegion* addr_to_region(HeapWord* addr) const; | |
| 118 | |
| 119 // Return the HeapRegion that corresponds to the given | |
| 120 // address. Assume the address is valid. | |
| 121 inline HeapRegion* addr_to_region_unsafe(HeapWord* addr) const; | |
| 342 | 122 |
| 3766 | 123 // Return the number of regions that have been committed in the heap. |
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124 uint length() const { return _length; } |
| 3766 | 125 |
| 126 // Return the maximum number of regions in the heap. | |
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127 uint max_length() const { return _max_length; } |
| 342 | 128 |
| 3766 | 129 // Expand the sequence to reflect that the heap has grown from |
| 130 // old_end to new_end. Either create new HeapRegions, or re-use | |
| 131 // existing ones, and return them in the given list. Returns the | |
| 132 // memory region that covers the newly-created regions. If a | |
| 133 // HeapRegion allocation fails, the result memory region might be | |
| 134 // smaller than the desired one. | |
| 135 MemRegion expand_by(HeapWord* old_end, HeapWord* new_end, | |
| 136 FreeRegionList* list); | |
| 342 | 137 |
| 3766 | 138 // Return the number of contiguous regions at the end of the sequence |
| 342 | 139 // that are available for allocation. |
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140 uint free_suffix(); |
| 342 | 141 |
| 2361 | 142 // Find a contiguous set of empty regions of length num and return |
| 3766 | 143 // the index of the first region or G1_NULL_HRS_INDEX if the |
| 144 // search was unsuccessful. | |
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145 uint find_contiguous(uint num); |
| 342 | 146 |
| 3766 | 147 // Apply blk->doHeapRegion() on all committed regions in address order, |
| 148 // terminating the iteration early if doHeapRegion() returns true. | |
| 149 void iterate(HeapRegionClosure* blk) const; | |
| 342 | 150 |
| 3766 | 151 // As above, but start the iteration from hr and loop around. If hr |
| 152 // is NULL, we start from the first region in the heap. | |
| 153 void iterate_from(HeapRegion* hr, HeapRegionClosure* blk) const; | |
| 342 | 154 |
| 3766 | 155 // Tag as uncommitted as many regions that are completely free as |
| 156 // possible, up to shrink_bytes, from the suffix of the committed | |
| 157 // sequence. Return a MemRegion that corresponds to the address | |
| 158 // range of the uncommitted regions. Assume shrink_bytes is page and | |
| 159 // heap region aligned. | |
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160 MemRegion shrink_by(size_t shrink_bytes, uint* num_regions_deleted); |
| 342 | 161 |
| 3766 | 162 // Do some sanity checking. |
| 163 void verify_optional() PRODUCT_RETURN; | |
| 342 | 164 }; |
| 1972 | 165 |
| 166 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |