Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1HotCardCache.cpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
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10246 | 1 /* |
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2 * Copyright (c) 2013, 2015, 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/dirtyCardQueue.hpp" | |
27 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
28 #include "gc_implementation/g1/g1HotCardCache.hpp" | |
29 #include "gc_implementation/g1/g1RemSet.hpp" | |
30 #include "runtime/atomic.hpp" | |
31 | |
32 G1HotCardCache::G1HotCardCache(G1CollectedHeap *g1h): | |
33 _g1h(g1h), _hot_cache(NULL), _use_cache(false), _card_counts(g1h) {} | |
34 | |
20337 | 35 void G1HotCardCache::initialize(G1RegionToSpaceMapper* card_counts_storage) { |
10246 | 36 if (default_use_cache()) { |
37 _use_cache = true; | |
38 | |
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39 _hot_cache_size = (size_t)1 << G1ConcRSLogCacheSize; |
10246 | 40 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC); |
41 | |
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42 reset_hot_cache_internal(); |
10246 | 43 |
44 // For refining the cards in the hot cache in parallel | |
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45 _hot_cache_par_chunk_size = (int)(ParallelGCThreads > 0 ? ClaimChunkSize : _hot_cache_size); |
10246 | 46 _hot_cache_par_claimed_idx = 0; |
47 | |
20337 | 48 _card_counts.initialize(card_counts_storage); |
10246 | 49 } |
50 } | |
51 | |
52 G1HotCardCache::~G1HotCardCache() { | |
53 if (default_use_cache()) { | |
54 assert(_hot_cache != NULL, "Logic"); | |
55 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC); | |
56 } | |
57 } | |
58 | |
59 jbyte* G1HotCardCache::insert(jbyte* card_ptr) { | |
60 uint count = _card_counts.add_card_count(card_ptr); | |
61 if (!_card_counts.is_hot(count)) { | |
62 // The card is not hot so do not store it in the cache; | |
63 // return it for immediate refining. | |
64 return card_ptr; | |
65 } | |
66 // Otherwise, the card is hot. | |
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67 size_t index = Atomic::add_ptr((intptr_t)1, (volatile intptr_t*)&_hot_cache_idx) - 1; |
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68 size_t masked_index = index & (_hot_cache_size - 1); |
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69 jbyte* current_ptr = _hot_cache[masked_index]; |
10246 | 70 |
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71 // Try to store the new card pointer into the cache. Compare-and-swap to guard |
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72 // against the unlikely event of a race resulting in another card pointer to |
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73 // have already been written to the cache. In this case we will return |
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74 // card_ptr in favor of the other option, which would be starting over. This |
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75 // should be OK since card_ptr will likely be the older card already when/if |
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76 // this ever happens. |
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77 jbyte* previous_ptr = (jbyte*)Atomic::cmpxchg_ptr(card_ptr, |
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78 &_hot_cache[masked_index], |
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79 current_ptr); |
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80 return (previous_ptr == current_ptr) ? previous_ptr : card_ptr; |
10246 | 81 } |
82 | |
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83 void G1HotCardCache::drain(uint worker_i, |
10246 | 84 G1RemSet* g1rs, |
85 DirtyCardQueue* into_cset_dcq) { | |
86 if (!default_use_cache()) { | |
87 assert(_hot_cache == NULL, "Logic"); | |
88 return; | |
89 } | |
90 | |
91 assert(_hot_cache != NULL, "Logic"); | |
92 assert(!use_cache(), "cache should be disabled"); | |
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93 while (_hot_cache_par_claimed_idx < _hot_cache_size) { |
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94 size_t end_idx = Atomic::add_ptr((intptr_t)_hot_cache_par_chunk_size, |
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95 (volatile intptr_t*)&_hot_cache_par_claimed_idx); |
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96 size_t start_idx = end_idx - _hot_cache_par_chunk_size; |
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97 // The current worker has successfully claimed the chunk [start_idx..end_idx) |
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98 end_idx = MIN2(end_idx, _hot_cache_size); |
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99 for (size_t i = start_idx; i < end_idx; i++) { |
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100 jbyte* card_ptr = _hot_cache[i]; |
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101 if (card_ptr != NULL) { |
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102 if (g1rs->refine_card(card_ptr, worker_i, true)) { |
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103 // The part of the heap spanned by the card contains references |
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104 // that point into the current collection set. |
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105 // We need to record the card pointer in the DirtyCardQueueSet |
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106 // that we use for such cards. |
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107 // |
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108 // The only time we care about recording cards that contain |
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109 // references that point into the collection set is during |
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110 // RSet updating while within an evacuation pause. |
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111 // In this case worker_i should be the id of a GC worker thread |
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112 assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); |
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113 assert(worker_i < ParallelGCThreads, |
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114 err_msg("incorrect worker id: %u", worker_i)); |
10246 | 115 |
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116 into_cset_dcq->enqueue(card_ptr); |
10246 | 117 } |
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118 } else { |
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119 break; |
10246 | 120 } |
121 } | |
122 } | |
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123 |
10246 | 124 // The existing entries in the hot card cache, which were just refined |
125 // above, are discarded prior to re-enabling the cache near the end of the GC. | |
126 } | |
127 | |
128 void G1HotCardCache::reset_card_counts(HeapRegion* hr) { | |
129 _card_counts.clear_region(hr); | |
130 } | |
131 | |
132 void G1HotCardCache::reset_card_counts() { | |
133 _card_counts.clear_all(); | |
134 } |