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annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 20304:a22acf6d7598

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8048112: G1 Full GC needs to support the case when the very first region is not available Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett. Reviewed-by: brutisso
author tschatzl
date Mon, 21 Jul 2014 10:00:31 +0200
parents 570cb6369f17
children 1f1d373cd044
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1 /*
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
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27
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28 #include "gc_implementation/g1/g1HotCardCache.hpp"
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29 #include "memory/allocation.hpp"
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30 #include "runtime/thread.hpp"
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31 #include "utilities/globalDefinitions.hpp"
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32
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33 // Forward decl
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34 class ConcurrentG1RefineThread;
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35 class G1CollectedHeap;
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36 class G1HotCardCache;
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37 class G1RemSet;
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38 class DirtyCardQueue;
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39
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40 class ConcurrentG1Refine: public CHeapObj<mtGC> {
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41 ConcurrentG1RefineThread** _threads;
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42 uint _n_threads;
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43 uint _n_worker_threads;
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44 /*
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45 * The value of the update buffer queue length falls into one of 3 zones:
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46 * green, yellow, red. If the value is in [0, green) nothing is
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47 * done, the buffers are left unprocessed to enable the caching effect of the
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48 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement
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49 * threads are gradually activated. In [yellow, red) all threads are
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50 * running. If the length becomes red (max queue length) the mutators start
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51 * processing the buffers.
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52 *
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53 * There are some interesting cases (when G1UseAdaptiveConcRefinement
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54 * is turned off):
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55 * 1) green = yellow = red = 0. In this case the mutator will process all
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56 * buffers. Except for those that are created by the deferred updates
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57 * machinery during a collection.
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58 * 2) green = 0. Means no caching. Can be a good way to minimize the
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59 * amount of time spent updating rsets during a collection.
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60 */
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61 int _green_zone;
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62 int _yellow_zone;
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63 int _red_zone;
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64
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65 int _thread_threshold_step;
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66
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67 // We delay the refinement of 'hot' cards using the hot card cache.
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68 G1HotCardCache _hot_card_cache;
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69
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70 // Reset the threshold step value based of the current zone boundaries.
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71 void reset_threshold_step();
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72
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73 public:
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74 ConcurrentG1Refine(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure);
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75 ~ConcurrentG1Refine();
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76
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77 void init(); // Accomplish some initialization that has to wait.
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78 void stop();
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79
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80 void reinitialize_threads();
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81
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82 // Iterate over all concurrent refinement threads
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83 void threads_do(ThreadClosure *tc);
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84
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85 // Iterate over all worker refinement threads
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86 void worker_threads_do(ThreadClosure * tc);
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87
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88 // The RS sampling thread
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89 ConcurrentG1RefineThread * sampling_thread() const;
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90
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91 static uint thread_num();
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93 void print_worker_threads_on(outputStream* st) const;
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94
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95 void set_green_zone(int x) { _green_zone = x; }
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96 void set_yellow_zone(int x) { _yellow_zone = x; }
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97 void set_red_zone(int x) { _red_zone = x; }
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98
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99 int green_zone() const { return _green_zone; }
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100 int yellow_zone() const { return _yellow_zone; }
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101 int red_zone() const { return _red_zone; }
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102
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103 uint total_thread_num() const { return _n_threads; }
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104 uint worker_thread_num() const { return _n_worker_threads; }
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105
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106 int thread_threshold_step() const { return _thread_threshold_step; }
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107
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108 G1HotCardCache* hot_card_cache() { return &_hot_card_cache; }
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109 };
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111 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP