Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1HotCardCache.cpp @ 20481:c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
Reviewed-by: brutisso, tschatzl
| author | brutisso |
|---|---|
| date | Tue, 16 Sep 2014 14:27:40 +0200 |
| parents | 1f1d373cd044 |
| children |
| rev | line source |
|---|---|
| 10246 | 1 /* |
| 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. | |
| 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 | |
| 39 _hot_cache_size = (1 << G1ConcRSLogCacheSize); | |
| 40 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size, mtGC); | |
| 41 | |
| 42 _n_hot = 0; | |
| 43 _hot_cache_idx = 0; | |
| 44 | |
| 45 // For refining the cards in the hot cache in parallel | |
|
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46 uint n_workers = (ParallelGCThreads > 0 ? |
| 10246 | 47 _g1h->workers()->total_workers() : 1); |
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48 _hot_cache_par_chunk_size = MAX2(1, _hot_cache_size / (int)n_workers); |
| 10246 | 49 _hot_cache_par_claimed_idx = 0; |
| 50 | |
| 20337 | 51 _card_counts.initialize(card_counts_storage); |
| 10246 | 52 } |
| 53 } | |
| 54 | |
| 55 G1HotCardCache::~G1HotCardCache() { | |
| 56 if (default_use_cache()) { | |
| 57 assert(_hot_cache != NULL, "Logic"); | |
| 58 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache, mtGC); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 jbyte* G1HotCardCache::insert(jbyte* card_ptr) { | |
| 63 uint count = _card_counts.add_card_count(card_ptr); | |
| 64 if (!_card_counts.is_hot(count)) { | |
| 65 // The card is not hot so do not store it in the cache; | |
| 66 // return it for immediate refining. | |
| 67 return card_ptr; | |
| 68 } | |
| 69 | |
| 70 // Otherwise, the card is hot. | |
| 71 jbyte* res = NULL; | |
| 72 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); | |
| 73 if (_n_hot == _hot_cache_size) { | |
| 74 res = _hot_cache[_hot_cache_idx]; | |
| 75 _n_hot--; | |
| 76 } | |
| 77 | |
| 78 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. | |
| 79 _hot_cache[_hot_cache_idx] = card_ptr; | |
| 80 _hot_cache_idx++; | |
| 81 | |
| 82 if (_hot_cache_idx == _hot_cache_size) { | |
| 83 // Wrap around | |
| 84 _hot_cache_idx = 0; | |
| 85 } | |
| 86 _n_hot++; | |
| 87 | |
| 88 return res; | |
| 89 } | |
| 90 | |
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parents:
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changeset
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91 void G1HotCardCache::drain(uint worker_i, |
| 10246 | 92 G1RemSet* g1rs, |
| 93 DirtyCardQueue* into_cset_dcq) { | |
| 94 if (!default_use_cache()) { | |
| 95 assert(_hot_cache == NULL, "Logic"); | |
| 96 return; | |
| 97 } | |
| 98 | |
| 99 assert(_hot_cache != NULL, "Logic"); | |
| 100 assert(!use_cache(), "cache should be disabled"); | |
| 101 int start_idx; | |
| 102 | |
| 103 while ((start_idx = _hot_cache_par_claimed_idx) < _n_hot) { // read once | |
| 104 int end_idx = start_idx + _hot_cache_par_chunk_size; | |
| 105 | |
| 106 if (start_idx == | |
| 107 Atomic::cmpxchg(end_idx, &_hot_cache_par_claimed_idx, start_idx)) { | |
| 108 // The current worker has successfully claimed the chunk [start_idx..end_idx) | |
| 109 end_idx = MIN2(end_idx, _n_hot); | |
| 110 for (int i = start_idx; i < end_idx; i++) { | |
| 111 jbyte* card_ptr = _hot_cache[i]; | |
| 112 if (card_ptr != NULL) { | |
| 113 if (g1rs->refine_card(card_ptr, worker_i, true)) { | |
| 114 // The part of the heap spanned by the card contains references | |
| 115 // that point into the current collection set. | |
| 116 // We need to record the card pointer in the DirtyCardQueueSet | |
| 117 // that we use for such cards. | |
| 118 // | |
| 119 // The only time we care about recording cards that contain | |
| 120 // references that point into the collection set is during | |
| 121 // RSet updating while within an evacuation pause. | |
| 122 // In this case worker_i should be the id of a GC worker thread | |
| 123 assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); | |
|
17844
8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents:
10246
diff
changeset
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124 assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), |
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8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
parents:
10246
diff
changeset
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125 err_msg("incorrect worker id: "UINT32_FORMAT, worker_i)); |
| 10246 | 126 |
| 127 into_cset_dcq->enqueue(card_ptr); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 } | |
| 132 } | |
| 133 // The existing entries in the hot card cache, which were just refined | |
| 134 // above, are discarded prior to re-enabling the cache near the end of the GC. | |
| 135 } | |
| 136 | |
| 137 void G1HotCardCache::reset_card_counts(HeapRegion* hr) { | |
| 138 _card_counts.clear_region(hr); | |
| 139 } | |
| 140 | |
| 141 void G1HotCardCache::reset_card_counts() { | |
| 142 _card_counts.clear_all(); | |
| 143 } |