Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 10246:194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
Summary: Refactor G1's hot card cache and card counts table into their own files. Simplify the card counts table, including removing the encoding of the card index in each entry. The card counts table now has a 1:1 correspondence with the cards spanned by heap. Space for the card counts table is reserved from virtual memory (rather than C heap) during JVM startup and is committed/expanded when the heap is expanded. Changes were also reviewed-by Vitaly Davidovich.
Reviewed-by: tschatzl, jmasa
| author | johnc |
|---|---|
| date | Thu, 09 May 2013 11:16:39 -0700 |
| parents | b9a9ed0f8eeb |
| children | e72f7eecc96d |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP | |
| 27 | |
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28 #include "gc_implementation/g1/g1HotCardCache.hpp" |
| 1972 | 29 #include "memory/allocation.hpp" |
| 30 #include "runtime/thread.hpp" | |
| 31 #include "utilities/globalDefinitions.hpp" | |
| 32 | |
| 342 | 33 // Forward decl |
| 34 class ConcurrentG1RefineThread; | |
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35 class G1CollectedHeap; |
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36 class G1HotCardCache; |
| 342 | 37 class G1RemSet; |
| 38 | |
| 6197 | 39 class ConcurrentG1Refine: public CHeapObj<mtGC> { |
| 794 | 40 ConcurrentG1RefineThread** _threads; |
| 41 int _n_threads; | |
| 1111 | 42 int _n_worker_threads; |
| 43 /* | |
| 44 * The value of the update buffer queue length falls into one of 3 zones: | |
| 45 * green, yellow, red. If the value is in [0, green) nothing is | |
| 46 * done, the buffers are left unprocessed to enable the caching effect of the | |
| 47 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement | |
| 48 * threads are gradually activated. In [yellow, red) all threads are | |
| 49 * running. If the length becomes red (max queue length) the mutators start | |
| 50 * processing the buffers. | |
| 51 * | |
| 1282 | 52 * There are some interesting cases (when G1UseAdaptiveConcRefinement |
| 53 * is turned off): | |
| 1111 | 54 * 1) green = yellow = red = 0. In this case the mutator will process all |
| 55 * buffers. Except for those that are created by the deferred updates | |
| 56 * machinery during a collection. | |
| 57 * 2) green = 0. Means no caching. Can be a good way to minimize the | |
| 58 * amount of time spent updating rsets during a collection. | |
| 59 */ | |
| 60 int _green_zone; | |
| 61 int _yellow_zone; | |
| 62 int _red_zone; | |
| 63 | |
| 64 int _thread_threshold_step; | |
| 65 | |
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66 // We delay the refinement of 'hot' cards using the hot card cache. |
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67 G1HotCardCache _hot_card_cache; |
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68 |
| 1111 | 69 // Reset the threshold step value based of the current zone boundaries. |
| 70 void reset_threshold_step(); | |
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71 |
| 342 | 72 public: |
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73 ConcurrentG1Refine(G1CollectedHeap* g1h); |
| 342 | 74 ~ConcurrentG1Refine(); |
| 75 | |
| 76 void init(); // Accomplish some initialization that has to wait. | |
| 794 | 77 void stop(); |
| 342 | 78 |
| 1111 | 79 void reinitialize_threads(); |
| 80 | |
| 794 | 81 // Iterate over the conc refine threads |
| 82 void threads_do(ThreadClosure *tc); | |
| 342 | 83 |
| 1111 | 84 static int thread_num(); |
| 1019 | 85 |
| 86 void print_worker_threads_on(outputStream* st) const; | |
| 1111 | 87 |
| 88 void set_green_zone(int x) { _green_zone = x; } | |
| 89 void set_yellow_zone(int x) { _yellow_zone = x; } | |
| 90 void set_red_zone(int x) { _red_zone = x; } | |
| 91 | |
| 92 int green_zone() const { return _green_zone; } | |
| 93 int yellow_zone() const { return _yellow_zone; } | |
| 94 int red_zone() const { return _red_zone; } | |
| 95 | |
| 96 int total_thread_num() const { return _n_threads; } | |
| 97 int worker_thread_num() const { return _n_worker_threads; } | |
| 98 | |
| 99 int thread_threshold_step() const { return _thread_threshold_step; } | |
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100 |
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101 G1HotCardCache* hot_card_cache() { return &_hot_card_cache; } |
| 342 | 102 }; |
| 1972 | 103 |
| 104 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |