Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CardCounts.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 1f1d373cd044 |
| children |
| rev | line source |
|---|---|
| 10246 | 1 /* |
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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP | |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP | |
| 27 | |
| 20337 | 28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
| 10246 | 29 #include "memory/allocation.hpp" |
| 30 #include "runtime/virtualspace.hpp" | |
| 31 #include "utilities/globalDefinitions.hpp" | |
| 32 | |
| 33 class CardTableModRefBS; | |
| 20337 | 34 class G1CardCounts; |
| 10246 | 35 class G1CollectedHeap; |
| 20337 | 36 class G1RegionToSpaceMapper; |
| 10246 | 37 class HeapRegion; |
| 38 | |
| 20337 | 39 class G1CardCountsMappingChangedListener : public G1MappingChangedListener { |
| 40 private: | |
| 41 G1CardCounts* _counts; | |
| 42 public: | |
| 43 void set_cardcounts(G1CardCounts* counts) { _counts = counts; } | |
| 44 | |
| 20543 | 45 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
| 20337 | 46 }; |
| 47 | |
| 10246 | 48 // Table to track the number of times a card has been refined. Once |
| 49 // a card has been refined a certain number of times, it is | |
| 50 // considered 'hot' and its refinement is delayed by inserting the | |
| 51 // card into the hot card cache. The card will then be refined when | |
| 52 // it is evicted from the hot card cache, or when the hot card cache | |
| 53 // is 'drained' during the next evacuation pause. | |
| 54 | |
| 55 class G1CardCounts: public CHeapObj<mtGC> { | |
| 20337 | 56 G1CardCountsMappingChangedListener _listener; |
| 57 | |
| 10246 | 58 G1CollectedHeap* _g1h; |
| 59 | |
| 60 // The table of counts | |
| 61 jubyte* _card_counts; | |
| 62 | |
| 63 // Max capacity of the reserved space for the counts table | |
| 64 size_t _reserved_max_card_num; | |
| 65 | |
| 66 // CardTable bottom. | |
| 67 const jbyte* _ct_bot; | |
| 68 | |
| 69 // Barrier set | |
| 70 CardTableModRefBS* _ct_bs; | |
| 71 | |
| 72 // Returns true if the card counts table has been reserved. | |
| 73 bool has_reserved_count_table() { return _card_counts != NULL; } | |
| 74 | |
| 75 // Returns true if the card counts table has been reserved and committed. | |
| 76 bool has_count_table() { | |
| 20337 | 77 return has_reserved_count_table(); |
| 10246 | 78 } |
| 79 | |
| 80 size_t ptr_2_card_num(const jbyte* card_ptr) { | |
| 81 assert(card_ptr >= _ct_bot, | |
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82 err_msg("Invalid card pointer: " |
| 10246 | 83 "card_ptr: " PTR_FORMAT ", " |
| 84 "_ct_bot: " PTR_FORMAT, | |
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parents:
12241
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changeset
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85 p2i(card_ptr), p2i(_ct_bot))); |
| 10246 | 86 size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte)); |
| 20337 | 87 assert(card_num >= 0 && card_num < _reserved_max_card_num, |
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17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
12241
diff
changeset
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88 err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr))); |
| 10246 | 89 return card_num; |
| 90 } | |
| 91 | |
| 92 jbyte* card_num_2_ptr(size_t card_num) { | |
| 20337 | 93 assert(card_num >= 0 && card_num < _reserved_max_card_num, |
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94 err_msg("card num out of range: "SIZE_FORMAT, card_num)); |
| 10246 | 95 return (jbyte*) (_ct_bot + card_num); |
| 96 } | |
| 97 | |
| 98 // Clear the counts table for the given (exclusive) index range. | |
| 99 void clear_range(size_t from_card_num, size_t to_card_num); | |
| 100 | |
| 101 public: | |
| 102 G1CardCounts(G1CollectedHeap* g1h); | |
| 103 | |
| 20337 | 104 void initialize(G1RegionToSpaceMapper* mapper); |
| 10246 | 105 |
| 106 // Increments the refinement count for the given card. | |
| 107 // Returns the pre-increment count value. | |
| 108 uint add_card_count(jbyte* card_ptr); | |
| 109 | |
| 110 // Returns true if the given count is high enough to be considered | |
| 111 // 'hot'; false otherwise. | |
| 112 bool is_hot(uint count); | |
| 113 | |
| 114 // Clears the card counts for the cards spanned by the region | |
| 115 void clear_region(HeapRegion* hr); | |
| 116 | |
| 20337 | 117 // Clears the card counts for the cards spanned by the MemRegion |
| 118 void clear_range(MemRegion mr); | |
| 119 | |
| 10246 | 120 // Clear the entire card counts table during GC. |
| 121 void clear_all(); | |
| 122 }; | |
| 123 | |
| 124 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP |