Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/collectionSetChooser.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
| author | tonyp |
|---|---|
| date | Wed, 19 Jan 2011 09:35:17 -0500 |
| parents | f95d63e2154a |
| children | 371bbc844bf1 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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. |
| 32 | |
|
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33 class CSetChooserCache VALUE_OBJ_CLASS_SPEC { |
| 342 | 34 private: |
| 35 enum { | |
| 36 CacheLength = 16 | |
| 37 } PrivateConstants; | |
| 38 | |
| 39 HeapRegion* _cache[CacheLength]; | |
| 40 int _occupancy; // number of region in cache | |
| 41 int _first; // "first" region in the cache | |
| 42 | |
| 43 // adding CacheLength to deal with negative values | |
| 44 inline int trim_index(int index) { | |
| 45 return (index + CacheLength) % CacheLength; | |
| 46 } | |
| 47 | |
| 48 inline int get_sort_index(int index) { | |
| 49 return -index-2; | |
| 50 } | |
| 51 inline int get_index(int sort_index) { | |
| 52 return -sort_index-2; | |
| 53 } | |
| 54 | |
| 55 public: | |
| 56 CSetChooserCache(void); | |
| 57 | |
| 58 inline int occupancy(void) { return _occupancy; } | |
| 59 inline bool is_full() { return _occupancy == CacheLength; } | |
| 60 inline bool is_empty() { return _occupancy == 0; } | |
| 61 | |
| 62 void clear(void); | |
| 63 void insert(HeapRegion *hr); | |
| 64 HeapRegion *remove_first(void); | |
| 65 void remove (HeapRegion *hr); | |
| 66 inline HeapRegion *get_first(void) { | |
| 67 return _cache[_first]; | |
| 68 } | |
| 69 | |
| 70 #ifndef PRODUCT | |
| 71 bool verify (void); | |
| 72 bool region_in_cache(HeapRegion *hr) { | |
| 73 int sort_index = hr->sort_index(); | |
| 74 if (sort_index < -1) { | |
| 75 int index = get_index(sort_index); | |
| 76 guarantee(index < CacheLength, "should be within bounds"); | |
| 77 return _cache[index] == hr; | |
| 78 } else | |
| 79 return 0; | |
| 80 } | |
| 81 #endif // PRODUCT | |
| 82 }; | |
| 83 | |
| 84 class CollectionSetChooser: public CHeapObj { | |
| 85 | |
| 86 GrowableArray<HeapRegion*> _markedRegions; | |
| 87 int _curMarkedIndex; | |
| 88 int _numMarkedRegions; | |
| 89 CSetChooserCache _cache; | |
| 90 | |
| 91 // True iff last collection pause ran of out new "age 0" regions, and | |
| 92 // returned an "age 1" region. | |
| 93 bool _unmarked_age_1_returned_as_new; | |
| 94 | |
| 95 jint _first_par_unreserved_idx; | |
| 96 | |
| 97 public: | |
| 98 | |
| 99 HeapRegion* getNextMarkedRegion(double time_so_far, double avg_prediction); | |
| 100 | |
| 101 CollectionSetChooser(); | |
| 102 | |
| 103 void printSortedHeapRegions(); | |
| 104 | |
| 105 void sortMarkedHeapRegions(); | |
| 106 void fillCache(); | |
| 107 bool addRegionToCache(void); | |
| 108 void addMarkedHeapRegion(HeapRegion *hr); | |
| 109 | |
| 110 // Must be called before calls to getParMarkedHeapRegionChunk. | |
| 111 // "n_regions" is the number of regions, "chunkSize" the chunk size. | |
| 112 void prepareForAddMarkedHeapRegionsPar(size_t n_regions, size_t chunkSize); | |
| 113 // Returns the first index in a contiguous chunk of "n_regions" indexes | |
| 114 // that the calling thread has reserved. These must be set by the | |
| 115 // calling thread using "setMarkedHeapRegion" (to NULL if necessary). | |
| 116 jint getParMarkedHeapRegionChunk(jint n_regions); | |
| 117 // Set the marked array entry at index to hr. Careful to claim the index | |
| 118 // first if in parallel. | |
| 119 void setMarkedHeapRegion(jint index, HeapRegion* hr); | |
| 120 // Atomically increment the number of claimed regions by "inc_by". | |
| 121 void incNumMarkedHeapRegions(jint inc_by); | |
| 122 | |
| 123 void clearMarkedHeapRegions(); | |
| 124 | |
| 125 void updateAfterFullCollection(); | |
| 126 | |
| 127 // Ensure that "hr" is not a member of the marked region array or the cache | |
| 128 void removeRegion(HeapRegion* hr); | |
| 129 | |
| 130 bool unmarked_age_1_returned_as_new() { return _unmarked_age_1_returned_as_new; } | |
| 131 | |
| 132 // Returns true if the used portion of "_markedRegions" is properly | |
| 133 // sorted, otherwise asserts false. | |
| 134 #ifndef PRODUCT | |
| 135 bool verify(void); | |
| 136 bool regionProperlyOrdered(HeapRegion* r) { | |
| 137 int si = r->sort_index(); | |
| 138 return (si == -1) || | |
| 139 (si > -1 && _markedRegions.at(si) == r) || | |
| 140 (si < -1 && _cache.region_in_cache(r)); | |
| 141 } | |
| 142 #endif | |
| 143 | |
| 144 }; | |
| 1972 | 145 |
| 146 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_COLLECTIONSETCHOOSER_HPP |