rev 47863 : imported patch 8190426-lazy-init-refinement-threads
1 /* 2 * Copyright (c) 2001, 2017, 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/g1ConcurrentRefine.hpp" 27 #include "gc/g1/g1ConcurrentRefineThread.hpp" 28 #include "gc/shared/suspendibleThreadSet.hpp" 29 #include "logging/log.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "runtime/handles.inline.hpp" 32 #include "runtime/mutexLocker.hpp" 33 34 G1ConcurrentRefineThread::G1ConcurrentRefineThread(G1ConcurrentRefine* cr, uint worker_id) : 35 ConcurrentGCThread(), 36 _worker_id(worker_id), 37 _active(false), 38 _monitor(NULL), 39 _cr(cr), 40 _vtime_accum(0.0) 41 { 42 // Each thread has its own monitor. The i-th thread is responsible for signaling 43 // to thread i+1 if the number of buffers in the queue exceeds a threshold for this 44 // thread. Monitors are also used to wake up the threads during termination. 45 // The 0th (primary) worker is notified by mutator threads and has a special monitor. 46 if (!is_primary()) { 47 _monitor = new Monitor(Mutex::nonleaf, "Refinement monitor", true, 48 Monitor::_safepoint_check_never); 49 } else { 50 _monitor = DirtyCardQ_CBL_mon; 51 } 52 53 // set name 54 set_name("G1 Refine#%d", worker_id); 55 create_and_start(); 56 } 57 58 void G1ConcurrentRefineThread::wait_for_completed_buffers() { 59 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); 60 while (!should_terminate() && !is_active()) { 61 _monitor->wait(Mutex::_no_safepoint_check_flag); 62 } 63 } 64 65 bool G1ConcurrentRefineThread::is_active() { 66 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); 67 return is_primary() ? dcqs.process_completed_buffers() : _active; 68 } 69 70 void G1ConcurrentRefineThread::activate() { 71 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); 72 if (!is_primary()) { 73 set_active(true); 74 } else { 75 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); 76 dcqs.set_process_completed(true); 77 } 78 _monitor->notify(); 79 } 80 81 void G1ConcurrentRefineThread::deactivate() { 82 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); 83 if (!is_primary()) { 84 set_active(false); 85 } else { 86 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); 87 dcqs.set_process_completed(false); 88 } 89 } 90 91 void G1ConcurrentRefineThread::run_service() { 92 _vtime_start = os::elapsedVTime(); 93 94 while (!should_terminate()) { 95 // Wait for work 96 wait_for_completed_buffers(); 97 if (should_terminate()) { 98 break; 99 } 100 101 size_t buffers_processed = 0; 102 log_debug(gc, refine)("Activated worker %d, on threshold: " SIZE_FORMAT ", current: " SIZE_FORMAT, 103 _worker_id, _cr->activation_threshold(_worker_id), 104 JavaThread::dirty_card_queue_set().completed_buffers_num()); 105 106 { 107 SuspendibleThreadSetJoiner sts_join; 108 109 while (!should_terminate()) { 110 if (sts_join.should_yield()) { 111 sts_join.yield(); 112 continue; // Re-check for termination after yield delay. 113 } 114 115 if (!_cr->do_refinement_step(_worker_id)) { 116 break; 117 } 118 ++buffers_processed; 119 } 120 } 121 122 deactivate(); 123 log_debug(gc, refine)("Deactivated worker %d, off threshold: " SIZE_FORMAT 124 ", current: " SIZE_FORMAT ", processed: " SIZE_FORMAT, 125 _worker_id, _cr->deactivation_threshold(_worker_id), 126 JavaThread::dirty_card_queue_set().completed_buffers_num(), 127 buffers_processed); 128 129 if (os::supports_vtime()) { 130 _vtime_accum = (os::elapsedVTime() - _vtime_start); 131 } else { 132 _vtime_accum = 0.0; 133 } 134 } 135 136 log_debug(gc, refine)("Stopping %d", _worker_id); 137 } 138 139 void G1ConcurrentRefineThread::stop_service() { 140 MutexLockerEx x(_monitor, Mutex::_no_safepoint_check_flag); 141 _monitor->notify(); 142 } --- EOF ---