1 /* 2 * Copyright (c) 2014, 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/g1Log.hpp" 27 #include "gc_implementation/g1/g1StringDedup.hpp" 28 #include "gc_implementation/g1/g1StringDedupTable.hpp" 29 #include "gc_implementation/g1/g1StringDedupThread.hpp" 30 #include "gc_implementation/g1/g1StringDedupQueue.hpp" 31 32 G1StringDedupThread* G1StringDedupThread::_thread = NULL; 33 34 G1StringDedupThread::G1StringDedupThread() : 35 ConcurrentGCThread() { 36 set_name("String Deduplication Thread"); 37 create_and_start(); 38 } 39 40 G1StringDedupThread::~G1StringDedupThread() { 41 ShouldNotReachHere(); 42 } 43 44 void G1StringDedupThread::create() { 45 assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); 46 assert(_thread == NULL, "One string deduplication thread allowed"); 47 _thread = new G1StringDedupThread(); 48 } 49 50 G1StringDedupThread* G1StringDedupThread::thread() { 51 assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); 52 assert(_thread != NULL, "String deduplication thread not created"); 53 return _thread; 54 } 55 56 void G1StringDedupThread::run() { 57 G1StringDedupStat total_stat; 58 59 initialize_in_thread(); 60 wait_for_universe_init(); 61 62 // Main loop 63 for (;;) { 64 G1StringDedupStat stat; 65 66 stat.mark_idle(); 67 68 // Wait for the queue to become non-empty 69 G1StringDedupQueue::wait(); 70 if (_should_terminate) { 71 break; 72 } 73 74 { 75 // Include thread in safepoints 76 SuspendibleThreadSetJoiner sts; 77 78 stat.mark_exec(); 79 80 // Process the queue 81 for (;;) { 82 oop java_string = G1StringDedupQueue::pop(); 83 if (java_string == NULL) { 84 break; 85 } 86 87 G1StringDedupTable::deduplicate(java_string, stat); 88 89 // Safepoint this thread if needed 90 if (sts.should_yield()) { 91 stat.mark_block(); 92 sts.yield(); 93 stat.mark_unblock(); 94 } 95 } 96 97 G1StringDedupTable::trim_entry_cache(); 98 99 stat.mark_done(); 100 101 // Print statistics 102 total_stat.add(stat); 103 print(gclog_or_tty, stat, total_stat); 104 } 105 } 106 107 terminate(); 108 } 109 110 void G1StringDedupThread::stop() { 111 { 112 MonitorLockerEx ml(Terminator_lock); 113 _thread->_should_terminate = true; 114 } 115 116 G1StringDedupQueue::cancel_wait(); 117 118 { 119 MonitorLockerEx ml(Terminator_lock); 120 while (!_thread->_has_terminated) { 121 ml.wait(); 122 } 123 } 124 } 125 126 void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) { 127 if (G1Log::fine() || PrintStringDeduplicationStatistics) { 128 G1StringDedupStat::print_summary(st, last_stat, total_stat); 129 if (PrintStringDeduplicationStatistics) { 130 G1StringDedupStat::print_statistics(st, last_stat, false); 131 G1StringDedupStat::print_statistics(st, total_stat, true); 132 G1StringDedupTable::print_statistics(st); 133 G1StringDedupQueue::print_statistics(st); 134 } 135 } 136 }