Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 6197:d2a62e0f25eb
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
| author | zgu |
|---|---|
| date | Thu, 28 Jun 2012 17:03:16 -0400 |
| parents | 720b6a76dd9d |
| 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 |