Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/collectionSetChooser.hpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 21 Dec 2011 11:25:27 +0100 |
| parents | b9390528617c |
| children | a9647476d1a4 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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_COLLECTIONSETCHOOSER_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/heapRegion.hpp" | |
| 29 #include "utilities/growableArray.hpp" | |
| 30 | |
| 342 | 31 // We need to sort heap regions by collection desirability. |
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32 // This sorting is currently done in two "stages". An initial sort is |
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33 // done following a cleanup pause as soon as all of the marked but |
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34 // non-empty regions have been identified and the completely empty |
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35 // ones reclaimed. |
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36 // This gives us a global sort on a GC efficiency metric |
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37 // based on predictive data available at that time. However, |
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38 // any of these regions that are collected will only be collected |
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39 // during a future GC pause, by which time it is possible that newer |
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40 // data might allow us to revise and/or refine the earlier |
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41 // pause predictions, leading to changes in expected gc efficiency |
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42 // order. To somewhat mitigate this obsolescence, more so in the |
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43 // case of regions towards the end of the list, which will be |
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44 // picked later, these pre-sorted regions from the _markedRegions |
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45 // array are not used as is, but a small prefix thereof is |
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46 // insertion-sorted again into a small cache, based on more |
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47 // recent remembered set information. Regions are then drawn |
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48 // from this cache to construct the collection set at each |
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49 // incremental GC. |
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50 // This scheme and/or its implementation may be subject to |
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51 // revision in the future. |
| 342 | 52 |
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53 class CSetChooserCache VALUE_OBJ_CLASS_SPEC { |
| 342 | 54 private: |
| 55 enum { | |
| 56 CacheLength = 16 | |
| 57 } PrivateConstants; | |
| 58 | |
| 59 HeapRegion* _cache[CacheLength]; | |
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60 int _occupancy; // number of regions in cache |
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61 int _first; // (index of) "first" region in the cache |
| 342 | 62 |
| 63 // adding CacheLength to deal with negative values | |
| 64 inline int trim_index(int index) { | |
| 65 return (index + CacheLength) % CacheLength; | |
| 66 } | |
| 67 | |
| 68 inline int get_sort_index(int index) { | |
| 69 return -index-2; | |
| 70 } | |
| 71 inline int get_index(int sort_index) { | |
| 72 return -sort_index-2; | |
| 73 } | |
| 74 | |
| 75 public: | |
| 76 CSetChooserCache(void); | |
| 77 | |
| 78 inline int occupancy(void) { return _occupancy; } | |
| 79 inline bool is_full() { return _occupancy == CacheLength; } | |
| 80 inline bool is_empty() { return _occupancy == 0; } | |
| 81 | |
| 82 void clear(void); | |
| 83 void insert(HeapRegion *hr); | |
| 84 HeapRegion *remove_first(void); | |
| 85 inline HeapRegion *get_first(void) { | |
| 86 return _cache[_first]; | |
| 87 } | |
| 88 | |
| 89 #ifndef PRODUCT | |
| 90 bool verify (void); | |
| 91 bool region_in_cache(HeapRegion *hr) { | |
| 92 int sort_index = hr->sort_index(); | |
| 93 if (sort_index < -1) { | |
| 94 int index = get_index(sort_index); | |
| 95 guarantee(index < CacheLength, "should be within bounds"); | |
| 96 return _cache[index] == hr; | |
| 97 } else | |
| 98 return 0; | |
| 99 } | |
| 100 #endif // PRODUCT | |
| 101 }; | |
| 102 | |
| 103 class CollectionSetChooser: public CHeapObj { | |
| 104 | |
| 105 GrowableArray<HeapRegion*> _markedRegions; | |
| 106 int _curMarkedIndex; | |
| 107 int _numMarkedRegions; | |
| 108 CSetChooserCache _cache; | |
| 109 | |
| 110 // True iff last collection pause ran of out new "age 0" regions, and | |
| 111 // returned an "age 1" region. | |
| 112 bool _unmarked_age_1_returned_as_new; | |
| 113 | |
| 114 jint _first_par_unreserved_idx; | |
| 115 | |
| 116 public: | |
| 117 | |
| 118 HeapRegion* getNextMarkedRegion(double time_so_far, double avg_prediction); | |
| 119 | |
| 120 CollectionSetChooser(); | |
| 121 | |
| 122 void sortMarkedHeapRegions(); | |
| 123 void fillCache(); | |
| 124 void addMarkedHeapRegion(HeapRegion *hr); | |
| 125 | |
| 126 // Must be called before calls to getParMarkedHeapRegionChunk. | |
| 127 // "n_regions" is the number of regions, "chunkSize" the chunk size. | |
| 128 void prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize); | |
| 129 // Returns the first index in a contiguous chunk of "n_regions" indexes | |
| 130 // that the calling thread has reserved. These must be set by the | |
| 131 // calling thread using "setMarkedHeapRegion" (to NULL if necessary). | |
| 132 jint getParMarkedHeapRegionChunk(jint n_regions); | |
| 133 // Set the marked array entry at index to hr. Careful to claim the index | |
| 134 // first if in parallel. | |
| 135 void setMarkedHeapRegion(jint index, HeapRegion* hr); | |
| 136 // Atomically increment the number of claimed regions by "inc_by". | |
| 137 void incNumMarkedHeapRegions(jint inc_by); | |
| 138 | |
| 139 void clearMarkedHeapRegions(); | |
| 140 | |
| 141 void updateAfterFullCollection(); | |
| 142 | |
| 143 bool unmarked_age_1_returned_as_new() { return _unmarked_age_1_returned_as_new; } | |
| 144 | |
| 145 // Returns true if the used portion of "_markedRegions" is properly | |
| 146 // sorted, otherwise asserts false. | |
| 147 #ifndef PRODUCT | |
| 148 bool verify(void); | |
| 149 bool regionProperlyOrdered(HeapRegion* r) { | |
| 150 int si = r->sort_index(); | |
| 151 return (si == -1) || | |
| 152 (si > -1 && _markedRegions.at(si) == r) || | |
| 153 (si < -1 && _cache.region_in_cache(r)); | |
| 154 } | |
| 155 #endif | |
| 156 | |
| 157 }; | |
| 1972 | 158 |
| 159 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP |