1 /* 2 * Copyright (c) 2014, 2015, 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/g1/g1Log.hpp" 27 #include "gc/g1/g1StringDedup.hpp" 28 #include "gc/g1/g1StringDedupQueue.hpp" 29 #include "gc/g1/g1StringDedupTable.hpp" 30 #include "gc/g1/g1StringDedupThread.hpp" 31 #include "gc/g1/suspendibleThreadSet.hpp" 32 #include "runtime/atomic.inline.hpp" 33 34 G1StringDedupThread* G1StringDedupThread::_thread = NULL; 35 36 G1StringDedupThread::G1StringDedupThread() : 37 ConcurrentGCThread() { 38 set_name("G1 StrDedup"); 39 create_and_start(); 40 } 41 42 G1StringDedupThread::~G1StringDedupThread() { 43 ShouldNotReachHere(); 44 } 45 46 void G1StringDedupThread::create() { 47 assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); 48 assert(_thread == NULL, "One string deduplication thread allowed"); 49 _thread = new G1StringDedupThread(); 50 } 51 52 G1StringDedupThread* G1StringDedupThread::thread() { 53 assert(G1StringDedup::is_enabled(), "String deduplication not enabled"); 54 assert(_thread != NULL, "String deduplication thread not created"); 55 return _thread; 56 } 57 58 void G1StringDedupThread::run() { 59 G1StringDedupStat total_stat; 60 61 initialize_in_thread(); 62 wait_for_universe_init(); 63 64 // Main loop 65 for (;;) { 66 G1StringDedupStat stat; 67 68 stat.mark_idle(); 69 70 // Wait for the queue to become non-empty 71 G1StringDedupQueue::wait(); 72 if (_should_terminate) { 73 break; 74 } 75 76 { 77 // Include thread in safepoints 78 SuspendibleThreadSetJoiner sts_join; 79 80 stat.mark_exec(); 81 82 // Process the queue 83 for (;;) { 84 oop java_string = G1StringDedupQueue::pop(); 85 if (java_string == NULL) { 86 break; 87 } 88 89 G1StringDedupTable::deduplicate(java_string, stat); 90 91 // Safepoint this thread if needed 92 if (sts_join.should_yield()) { 93 stat.mark_block(); 94 sts_join.yield(); 95 stat.mark_unblock(); 96 } 97 } 98 99 G1StringDedupTable::trim_entry_cache(); 100 101 stat.mark_done(); 102 103 // Print statistics 104 total_stat.add(stat); 105 print(gclog_or_tty, stat, total_stat); 106 } 107 } 108 109 terminate(); 110 } 111 112 void G1StringDedupThread::stop() { 113 { 114 MonitorLockerEx ml(Terminator_lock); 115 _thread->_should_terminate = true; 116 } 117 118 G1StringDedupQueue::cancel_wait(); 119 120 { 121 MonitorLockerEx ml(Terminator_lock); 122 while (!_thread->_has_terminated) { 123 ml.wait(); 124 } 125 } 126 } 127 128 void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) { 129 if (G1Log::fine() || PrintStringDeduplicationStatistics) { 130 G1StringDedupStat::print_summary(st, last_stat, total_stat); 131 if (PrintStringDeduplicationStatistics) { 132 G1StringDedupStat::print_statistics(st, last_stat, false); 133 G1StringDedupStat::print_statistics(st, total_stat, true); 134 G1StringDedupTable::print_statistics(st); 135 G1StringDedupQueue::print_statistics(st); 136 } 137 } 138 }