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17764
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1 /*
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2 * Copyright (c) 2014, 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 #include "precompiled.hpp"
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26 #include "gc_implementation/g1/g1Log.hpp"
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27 #include "gc_implementation/g1/g1StringDedup.hpp"
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28 #include "gc_implementation/g1/g1StringDedupTable.hpp"
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29 #include "gc_implementation/g1/g1StringDedupThread.hpp"
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30 #include "gc_implementation/g1/g1StringDedupQueue.hpp"
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31
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32 G1StringDedupThread* G1StringDedupThread::_thread = NULL;
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33
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34 G1StringDedupThread::G1StringDedupThread() :
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35 ConcurrentGCThread() {
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36 set_name("String Deduplication Thread");
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37 create_and_start();
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38 }
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39
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40 G1StringDedupThread::~G1StringDedupThread() {
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41 ShouldNotReachHere();
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42 }
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43
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44 void G1StringDedupThread::create() {
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45 assert(G1StringDedup::is_enabled(), "String deduplication not enabled");
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46 assert(_thread == NULL, "One string deduplication thread allowed");
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47 _thread = new G1StringDedupThread();
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48 }
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49
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50 G1StringDedupThread* G1StringDedupThread::thread() {
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51 assert(G1StringDedup::is_enabled(), "String deduplication not enabled");
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52 assert(_thread != NULL, "String deduplication thread not created");
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53 return _thread;
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54 }
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55
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56 void G1StringDedupThread::print_on(outputStream* st) const {
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57 st->print("\"%s\" ", name());
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58 Thread::print_on(st);
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59 st->cr();
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60 }
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61
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62 void G1StringDedupThread::run() {
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63 G1StringDedupStat total_stat;
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64
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65 initialize_in_thread();
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66 wait_for_universe_init();
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67
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68 // Main loop
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69 for (;;) {
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70 G1StringDedupStat stat;
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71
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72 stat.mark_idle();
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73
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74 // Wait for the queue to become non-empty
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75 G1StringDedupQueue::wait();
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76
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77 // Include this thread in safepoints
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78 stsJoin();
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79
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80 stat.mark_exec();
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81
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82 // Process the queue
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83 for (;;) {
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84 oop java_string = G1StringDedupQueue::pop();
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85 if (java_string == NULL) {
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86 break;
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87 }
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88
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89 G1StringDedupTable::deduplicate(java_string, stat);
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90
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91 // Safepoint this thread if needed
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92 if (stsShouldYield()) {
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93 stat.mark_block();
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94 stsYield(NULL);
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95 stat.mark_unblock();
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96 }
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97 }
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98
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99 G1StringDedupTable::trim_entry_cache();
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100
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101 stat.mark_done();
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102
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103 // Print statistics
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104 total_stat.add(stat);
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105 print(gclog_or_tty, stat, total_stat);
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106
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107 // Exclude this thread from safepoints
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108 stsLeave();
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109 }
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110
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111 ShouldNotReachHere();
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112 }
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113
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114 void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) {
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115 if (G1Log::fine() || PrintStringDeduplicationStatistics) {
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116 G1StringDedupStat::print_summary(st, last_stat, total_stat);
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117 if (PrintStringDeduplicationStatistics) {
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118 G1StringDedupStat::print_statistics(st, last_stat, false);
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119 G1StringDedupStat::print_statistics(st, total_stat, true);
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120 G1StringDedupTable::print_statistics(st);
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121 G1StringDedupQueue::print_statistics(st);
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122 }
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123 }
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124 }
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