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