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annotate src/share/vm/gc_implementation/g1/g1HotCardCache.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 8847586c9037 |
children | 1f1d373cd044 |
rev | line source |
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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1HOTCARDCACHE_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1HOTCARDCACHE_HPP | |
27 | |
28 #include "gc_implementation/g1/g1_globals.hpp" | |
29 #include "gc_implementation/g1/g1CardCounts.hpp" | |
30 #include "memory/allocation.hpp" | |
31 #include "runtime/safepoint.hpp" | |
32 #include "runtime/thread.inline.hpp" | |
33 #include "utilities/globalDefinitions.hpp" | |
34 | |
35 class DirtyCardQueue; | |
36 class G1CollectedHeap; | |
37 class G1RemSet; | |
38 class HeapRegion; | |
39 | |
40 // An evicting cache of cards that have been logged by the G1 post | |
41 // write barrier. Placing a card in the cache delays the refinement | |
42 // of the card until the card is evicted, or the cache is drained | |
43 // during the next evacuation pause. | |
44 // | |
45 // The first thing the G1 post write barrier does is to check whether | |
46 // the card containing the updated pointer is already dirty and, if | |
47 // so, skips the remaining code in the barrier. | |
48 // | |
49 // Delaying the refinement of a card will make the card fail the | |
50 // first is_dirty check in the write barrier, skipping the remainder | |
51 // of the write barrier. | |
52 // | |
53 // This can significantly reduce the overhead of the write barrier | |
54 // code, increasing throughput. | |
55 | |
56 class G1HotCardCache: public CHeapObj<mtGC> { | |
57 G1CollectedHeap* _g1h; | |
58 | |
59 // The card cache table | |
60 jbyte** _hot_cache; | |
61 | |
62 int _hot_cache_size; | |
63 int _n_hot; | |
64 int _hot_cache_idx; | |
65 | |
66 int _hot_cache_par_chunk_size; | |
67 volatile int _hot_cache_par_claimed_idx; | |
68 | |
69 bool _use_cache; | |
70 | |
71 G1CardCounts _card_counts; | |
72 | |
73 bool default_use_cache() const { | |
74 return (G1ConcRSLogCacheSize > 0); | |
75 } | |
76 | |
77 public: | |
78 G1HotCardCache(G1CollectedHeap* g1h); | |
79 ~G1HotCardCache(); | |
80 | |
81 void initialize(); | |
82 | |
83 bool use_cache() { return _use_cache; } | |
84 | |
85 void set_use_cache(bool b) { | |
86 _use_cache = (b ? default_use_cache() : false); | |
87 } | |
88 | |
89 // Returns the card to be refined or NULL. | |
90 // | |
91 // Increments the count for given the card. if the card is not 'hot', | |
92 // it is returned for immediate refining. Otherwise the card is | |
93 // added to the hot card cache. | |
94 // If there is enough room in the hot card cache for the card we're | |
95 // adding, NULL is returned and no further action in needed. | |
96 // If we evict a card from the cache to make room for the new card, | |
97 // the evicted card is then returned for refinement. | |
98 jbyte* insert(jbyte* card_ptr); | |
99 | |
100 // Refine the cards that have delayed as a result of | |
101 // being in the cache. | |
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8847586c9037
8016302: Change type of the number of GC workers to unsigned int (2)
vkempik
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10246
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102 void drain(uint worker_i, G1RemSet* g1rs, DirtyCardQueue* into_cset_dcq); |
10246 | 103 |
104 // Set up for parallel processing of the cards in the hot cache | |
105 void reset_hot_cache_claimed_index() { | |
106 _hot_cache_par_claimed_idx = 0; | |
107 } | |
108 | |
109 // Resets the hot card cache and discards the entries. | |
110 void reset_hot_cache() { | |
111 assert(SafepointSynchronize::is_at_safepoint(), "Should be at a safepoint"); | |
112 assert(Thread::current()->is_VM_thread(), "Current thread should be the VMthread"); | |
113 _hot_cache_idx = 0; _n_hot = 0; | |
114 } | |
115 | |
116 bool hot_cache_is_empty() { return _n_hot == 0; } | |
117 | |
118 // Resizes the card counts table to match the given capacity | |
119 void resize_card_counts(size_t heap_capacity); | |
120 | |
121 // Zeros the values in the card counts table for entire committed heap | |
122 void reset_card_counts(); | |
123 | |
124 // Zeros the values in the card counts table for the given region | |
125 void reset_card_counts(HeapRegion* hr); | |
126 }; | |
127 | |
128 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1HOTCARDCACHE_HPP |