Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.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 | bca17e38de00 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP | |
| 27 | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 | |
| 0 | 30 class MutableSpace; |
| 31 class ObjectStartArray; | |
| 32 class PSPromotionManager; | |
| 33 class GCTaskQueue; | |
| 34 | |
| 35 class CardTableExtension : public CardTableModRefBS { | |
| 36 private: | |
| 37 // Support methods for resizing the card table. | |
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38 // resize_commit_uncommit() returns true if the pages were committed or |
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39 // uncommitted |
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40 bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
| 0 | 41 void resize_update_card_table_entries(int changed_region, |
| 42 MemRegion new_region); | |
| 43 void resize_update_committed_table(int changed_region, MemRegion new_region); | |
| 44 void resize_update_covered_table(int changed_region, MemRegion new_region); | |
| 45 | |
| 46 protected: | |
| 47 | |
| 48 static void verify_all_young_refs_precise_helper(MemRegion mr); | |
| 49 | |
| 50 public: | |
| 51 enum ExtendedCardValue { | |
| 52 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
| 53 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
| 54 }; | |
| 55 | |
| 56 CardTableExtension(MemRegion whole_heap, int max_covered_regions) : | |
| 57 CardTableModRefBS(whole_heap, max_covered_regions) { } | |
| 58 | |
| 59 // Too risky for the 4/10/02 putback | |
| 60 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } | |
| 61 | |
| 62 // Scavenge support | |
| 63 void scavenge_contents(ObjectStartArray* start_array, | |
| 64 MutableSpace* sp, | |
| 65 HeapWord* space_top, | |
| 66 PSPromotionManager* pm); | |
| 67 | |
| 68 void scavenge_contents_parallel(ObjectStartArray* start_array, | |
| 69 MutableSpace* sp, | |
| 70 HeapWord* space_top, | |
| 71 PSPromotionManager* pm, | |
| 72 uint stripe_number); | |
| 73 | |
| 74 // Verification | |
| 75 static void verify_all_young_refs_imprecise(); | |
| 76 static void verify_all_young_refs_precise(); | |
| 77 | |
| 78 bool addr_is_marked_imprecise(void *addr); | |
| 79 bool addr_is_marked_precise(void *addr); | |
| 80 | |
| 81 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } | |
| 82 | |
| 83 // Testers for entries | |
| 84 static bool card_is_dirty(int value) { return value == dirty_card; } | |
| 85 static bool card_is_newgen(int value) { return value == youngergen_card; } | |
| 86 static bool card_is_clean(int value) { return value == clean_card; } | |
| 87 static bool card_is_verify(int value) { return value == verify_card; } | |
| 88 | |
| 89 // Card marking | |
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90 void inline_write_ref_field_gc(void* field, oop new_val) { |
| 0 | 91 jbyte* byte = byte_for(field); |
| 92 *byte = youngergen_card; | |
| 93 } | |
| 94 | |
| 95 // Adaptive size policy support | |
| 96 // Allows adjustment of the base and size of the covered regions | |
| 97 void resize_covered_region(MemRegion new_region); | |
| 98 // Finds the covered region to resize based on the start address | |
| 99 // of the covered regions. | |
| 100 void resize_covered_region_by_start(MemRegion new_region); | |
| 101 // Finds the covered region to resize based on the end address | |
| 102 // of the covered regions. | |
| 103 void resize_covered_region_by_end(int changed_region, MemRegion new_region); | |
| 104 // Finds the lowest start address of a covered region that is | |
| 105 // previous (i.e., lower index) to the covered region with index "ind". | |
| 106 HeapWord* lowest_prev_committed_start(int ind) const; | |
| 107 | |
| 108 #ifdef ASSERT | |
| 109 | |
| 110 bool is_valid_card_address(jbyte* addr) { | |
| 111 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); | |
| 112 } | |
| 113 | |
| 114 #endif // ASSERT | |
| 115 }; | |
| 1972 | 116 |
| 117 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |