Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CardCounts.cpp @ 20404:227a9e5e4b4a
8057536: Refactor G1 to allow context specific allocations
Summary: Splitting out a g1 allocator class to simply specialized allocators which can associate each allocation with a given context.
Reviewed-by: mgerdin, brutisso
| author | sjohanss |
|---|---|
| date | Fri, 05 Sep 2014 09:49:19 +0200 |
| parents | 1f1d373cd044 |
| children | e7d0505c8a30 |
| rev | line source |
|---|---|
| 10246 | 1 /* |
|
17937
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2 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved. |
| 10246 | 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "gc_implementation/g1/g1CardCounts.hpp" | |
| 27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 29 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" | |
| 30 #include "memory/cardTableModRefBS.hpp" | |
| 31 #include "services/memTracker.hpp" | |
| 32 #include "utilities/copy.hpp" | |
| 33 | |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
12343
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changeset
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
12343
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changeset
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35 |
| 20337 | 36 void G1CardCountsMappingChangedListener::on_commit(uint start_idx, size_t num_regions) { |
| 37 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords); | |
| 38 _counts->clear_range(mr); | |
| 39 } | |
| 40 | |
| 10246 | 41 void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) { |
| 42 if (has_count_table()) { | |
| 43 assert(from_card_num < to_card_num, | |
| 44 err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT, | |
| 45 from_card_num, to_card_num)); | |
| 46 Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num)); | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 G1CardCounts::G1CardCounts(G1CollectedHeap *g1h): | |
| 20337 | 51 _listener(), _g1h(g1h), _card_counts(NULL), _reserved_max_card_num(0) { |
| 52 _listener.set_cardcounts(this); | |
| 53 } | |
| 10246 | 54 |
| 20337 | 55 void G1CardCounts::initialize(G1RegionToSpaceMapper* mapper) { |
| 10246 | 56 assert(_g1h->max_capacity() > 0, "initialization order"); |
| 57 assert(_g1h->capacity() == 0, "initialization order"); | |
| 58 | |
| 59 if (G1ConcRSHotCardLimit > 0) { | |
| 60 // The max value we can store in the counts table is | |
| 61 // max_jubyte. Guarantee the value of the hot | |
| 62 // threshold limit is no more than this. | |
| 63 guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity"); | |
| 64 | |
| 12343 | 65 _ct_bs = _g1h->g1_barrier_set(); |
| 10246 | 66 _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start()); |
| 67 | |
| 20337 | 68 _card_counts = (jubyte*) mapper->reserved().start(); |
| 69 _reserved_max_card_num = mapper->reserved().byte_size(); | |
| 70 mapper->set_mapping_changed_listener(&_listener); | |
| 10246 | 71 } |
| 72 } | |
| 73 | |
| 74 uint G1CardCounts::add_card_count(jbyte* card_ptr) { | |
| 75 // Returns the number of times the card has been refined. | |
| 76 // If we failed to reserve/commit the counts table, return 0. | |
| 77 // If card_ptr is beyond the committed end of the counts table, | |
| 78 // return 0. | |
| 79 // Otherwise return the actual count. | |
| 80 // Unless G1ConcRSHotCardLimit has been set appropriately, | |
| 81 // returning 0 will result in the card being considered | |
| 82 // cold and will be refined immediately. | |
| 83 uint count = 0; | |
| 84 if (has_count_table()) { | |
| 85 size_t card_num = ptr_2_card_num(card_ptr); | |
| 20337 | 86 assert(card_num < _reserved_max_card_num, |
| 87 err_msg("Card "SIZE_FORMAT" outside of card counts table (max size "SIZE_FORMAT")", | |
| 88 card_num, _reserved_max_card_num)); | |
| 89 count = (uint) _card_counts[card_num]; | |
| 90 if (count < G1ConcRSHotCardLimit) { | |
| 91 _card_counts[card_num] = | |
| 92 (jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit)); | |
| 10246 | 93 } |
| 94 } | |
| 95 return count; | |
| 96 } | |
| 97 | |
| 98 bool G1CardCounts::is_hot(uint count) { | |
| 99 return (count >= G1ConcRSHotCardLimit); | |
| 100 } | |
| 101 | |
| 102 void G1CardCounts::clear_region(HeapRegion* hr) { | |
| 20337 | 103 MemRegion mr(hr->bottom(), hr->end()); |
| 104 clear_range(mr); | |
| 105 } | |
| 10246 | 106 |
| 20337 | 107 void G1CardCounts::clear_range(MemRegion mr) { |
| 108 if (has_count_table()) { | |
| 109 const jbyte* from_card_ptr = _ct_bs->byte_for_const(mr.start()); | |
| 110 // We use the last address in the range as the range could represent the | |
| 111 // last region in the heap. In which case trying to find the card will be an | |
| 112 // OOB access to the card table. | |
| 113 const jbyte* last_card_ptr = _ct_bs->byte_for_const(mr.last()); | |
| 10246 | 114 |
| 115 #ifdef ASSERT | |
| 116 HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr); | |
| 20337 | 117 assert(start_addr == mr.start(), "MemRegion start must be aligned to a card."); |
| 10246 | 118 HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr); |
| 20337 | 119 assert((last_addr + CardTableModRefBS::card_size_in_words) == mr.end(), "MemRegion end must be aligned to a card."); |
| 10246 | 120 #endif // ASSERT |
| 121 | |
| 122 // Clear the counts for the (exclusive) card range. | |
| 123 size_t from_card_num = ptr_2_card_num(from_card_ptr); | |
| 124 size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1; | |
| 125 clear_range(from_card_num, to_card_num); | |
| 126 } | |
| 127 } | |
| 128 | |
| 20337 | 129 class G1CardCountsClearClosure : public HeapRegionClosure { |
| 130 private: | |
| 131 G1CardCounts* _card_counts; | |
| 132 public: | |
| 133 G1CardCountsClearClosure(G1CardCounts* card_counts) : | |
| 134 HeapRegionClosure(), _card_counts(card_counts) { } | |
| 135 | |
| 136 | |
| 137 virtual bool doHeapRegion(HeapRegion* r) { | |
| 138 _card_counts->clear_region(r); | |
| 139 return false; | |
| 140 } | |
| 141 }; | |
| 142 | |
| 10246 | 143 void G1CardCounts::clear_all() { |
| 144 assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise"); | |
| 20337 | 145 G1CardCountsClearClosure cl(this); |
| 146 _g1h->heap_region_iterate(&cl); | |
| 10246 | 147 } |