Bengt Rutisson | 9672a26 | 2014-06-19 13:31:14 +0200 | [diff] [blame] | 1 | /* |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 2 | * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved. |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 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 | * |
Erik Trimble | ba7c173 | 2010-05-27 19:08:38 -0700 | [diff] [blame] | 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. |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 22 | * |
| 23 | */ |
| 24 | |
Stefan Karlsson | 8006fe8 | 2010-11-23 13:22:55 -0800 | [diff] [blame] | 25 | #include "precompiled.hpp" |
Bengt Rutisson | ad3fb1d | 2016-02-10 12:56:55 +0100 | [diff] [blame] | 26 | #include "classfile/classLoaderData.hpp" |
Per Lidén | 4dc240f | 2015-05-13 15:16:06 +0200 | [diff] [blame] | 27 | #include "gc/g1/concurrentMarkThread.inline.hpp" |
| 28 | #include "gc/g1/g1CollectedHeap.inline.hpp" |
| 29 | #include "gc/g1/g1CollectorPolicy.hpp" |
Per Lidén | 4dc240f | 2015-05-13 15:16:06 +0200 | [diff] [blame] | 30 | #include "gc/g1/g1MMUTracker.hpp" |
Per Lidén | 5e68a86 | 2015-05-19 14:09:22 +0200 | [diff] [blame] | 31 | #include "gc/g1/suspendibleThreadSet.hpp" |
Per Lidén | 4dc240f | 2015-05-13 15:16:06 +0200 | [diff] [blame] | 32 | #include "gc/g1/vm_operations_g1.hpp" |
Bengt Rutisson | 003892f | 2015-09-30 09:07:21 +0200 | [diff] [blame] | 33 | #include "gc/shared/gcId.hpp" |
Per Lidén | 4dc240f | 2015-05-13 15:16:06 +0200 | [diff] [blame] | 34 | #include "gc/shared/gcTrace.hpp" |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 35 | #include "gc/shared/gcTraceTime.inline.hpp" |
| 36 | #include "logging/log.hpp" |
Stefan Karlsson | 8006fe8 | 2010-11-23 13:22:55 -0800 | [diff] [blame] | 37 | #include "memory/resourceArea.hpp" |
| 38 | #include "runtime/vmThread.hpp" |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 39 | |
| 40 | // ======= Concurrent Mark Thread ======== |
| 41 | |
| 42 | // The CM thread is created when the G1 garbage collector is used |
| 43 | |
| 44 | SurrogateLockerThread* |
| 45 | ConcurrentMarkThread::_slt = NULL; |
| 46 | |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 47 | ConcurrentMarkThread::ConcurrentMarkThread(G1ConcurrentMark* cm) : |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 48 | ConcurrentGCThread(), |
| 49 | _cm(cm), |
Bengt Rutisson | 5f4a670 | 2015-06-25 08:15:07 +0200 | [diff] [blame] | 50 | _state(Idle), |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 51 | _vtime_accum(0.0), |
John Cuthbertson | 0fa6fc2 | 2012-01-12 00:06:47 -0800 | [diff] [blame] | 52 | _vtime_mark_accum(0.0) { |
Zhengyu Gu | 16a3e2f | 2014-05-01 05:52:28 -0700 | [diff] [blame] | 53 | |
David Lindholm | 8fe1e48 | 2015-03-05 16:43:26 +0100 | [diff] [blame] | 54 | set_name("G1 Main Marker"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 55 | create_and_start(); |
| 56 | } |
| 57 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 58 | class CMCheckpointRootsFinalClosure: public VoidClosure { |
| 59 | |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 60 | G1ConcurrentMark* _cm; |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 61 | public: |
| 62 | |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 63 | CMCheckpointRootsFinalClosure(G1ConcurrentMark* cm) : |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 64 | _cm(cm) {} |
| 65 | |
| 66 | void do_void(){ |
| 67 | _cm->checkpointRootsFinal(false); // !clear_all_soft_refs |
| 68 | } |
| 69 | }; |
| 70 | |
| 71 | class CMCleanUp: public VoidClosure { |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 72 | G1ConcurrentMark* _cm; |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 73 | public: |
| 74 | |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 75 | CMCleanUp(G1ConcurrentMark* cm) : |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 76 | _cm(cm) {} |
| 77 | |
| 78 | void do_void(){ |
| 79 | _cm->cleanup(); |
| 80 | } |
| 81 | }; |
| 82 | |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 83 | // Marking pauses can be scheduled flexibly, so we might delay marking to meet MMU. |
| 84 | void ConcurrentMarkThread::delay_to_keep_mmu(G1CollectorPolicy* g1_policy, bool remark) { |
| 85 | if (g1_policy->adaptive_young_list_length()) { |
| 86 | double now = os::elapsedTime(); |
| 87 | double prediction_ms = remark ? g1_policy->predict_remark_time_ms() |
| 88 | : g1_policy->predict_cleanup_time_ms(); |
| 89 | G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker(); |
| 90 | jlong sleep_time_ms = mmu_tracker->when_ms(now, prediction_ms); |
| 91 | os::sleep(this, sleep_time_ms, false); |
| 92 | } |
| 93 | } |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 94 | |
| 95 | class GCConcPhaseTimer : StackObj { |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 96 | G1ConcurrentMark* _cm; |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 97 | |
| 98 | public: |
Erik Helin | 92143e5 | 2016-02-05 16:03:56 +0100 | [diff] [blame] | 99 | GCConcPhaseTimer(G1ConcurrentMark* cm, const char* title) : _cm(cm) { |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 100 | _cm->register_concurrent_phase_start(title); |
| 101 | } |
| 102 | |
| 103 | ~GCConcPhaseTimer() { |
| 104 | _cm->register_concurrent_phase_end(); |
| 105 | } |
| 106 | }; |
| 107 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 108 | void ConcurrentMarkThread::run() { |
| 109 | initialize_in_thread(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 110 | wait_for_universe_init(); |
| 111 | |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 112 | run_service(); |
| 113 | |
| 114 | terminate(); |
| 115 | } |
| 116 | |
| 117 | void ConcurrentMarkThread::run_service() { |
| 118 | _vtime_start = os::elapsedVTime(); |
| 119 | |
Antonios Printezis | 8bce4a6 | 2011-01-19 19:30:42 -0500 | [diff] [blame] | 120 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 121 | G1CollectorPolicy* g1_policy = g1h->g1_policy(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 122 | |
| 123 | while (!_should_terminate) { |
| 124 | // wait until started is set. |
| 125 | sleepBeforeNextCycle(); |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 126 | if (_should_terminate) { |
Bengt Rutisson | ad3fb1d | 2016-02-10 12:56:55 +0100 | [diff] [blame] | 127 | _cm->root_regions()->cancel_scan(); |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 128 | break; |
| 129 | } |
| 130 | |
Bengt Rutisson | b266f13 | 2015-10-09 20:31:56 +0200 | [diff] [blame] | 131 | assert(GCId::current() != GCId::undefined(), "GC id should have been set up by the initial mark GC."); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 132 | { |
| 133 | ResourceMark rm; |
| 134 | HandleMark hm; |
| 135 | double cycle_start = os::elapsedVTime(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 136 | |
Bengt Rutisson | ad3fb1d | 2016-02-10 12:56:55 +0100 | [diff] [blame] | 137 | { |
| 138 | GCConcPhaseTimer(_cm, "Concurrent Clearing of Claimed Marks"); |
| 139 | ClassLoaderDataGraph::clear_claimed_marks(); |
| 140 | } |
| 141 | |
Antonios Printezis | 802519e | 2012-01-25 12:58:23 -0500 | [diff] [blame] | 142 | // We have to ensure that we finish scanning the root regions |
| 143 | // before the next GC takes place. To ensure this we have to |
| 144 | // make sure that we do not join the STS until the root regions |
| 145 | // have been scanned. If we did then it's possible that a |
| 146 | // subsequent GC could block us from joining the STS and proceed |
| 147 | // without the root regions have been scanned which would be a |
| 148 | // correctness issue. |
| 149 | |
Bengt Rutisson | ad3fb1d | 2016-02-10 12:56:55 +0100 | [diff] [blame] | 150 | { |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 151 | GCConcPhaseTimer(_cm, "Concurrent Root Region Scanning"); |
Antonios Printezis | 802519e | 2012-01-25 12:58:23 -0500 | [diff] [blame] | 152 | _cm->scanRootRegions(); |
Antonios Printezis | 802519e | 2012-01-25 12:58:23 -0500 | [diff] [blame] | 153 | } |
| 154 | |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 155 | // It would be nice to use the GCTraceConcTime class here but |
| 156 | // the "end" logging is inside the loop and not at the end of |
| 157 | // a scope. Mimicking the same log output as GCTraceConcTime instead. |
| 158 | jlong mark_start = os::elapsed_counter(); |
| 159 | log_info(gc)("Concurrent Mark (%.3fs)", TimeHelper::counter_to_seconds(mark_start)); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 160 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 161 | int iter = 0; |
| 162 | do { |
| 163 | iter++; |
| 164 | if (!cm()->has_aborted()) { |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 165 | GCConcPhaseTimer(_cm, "Concurrent Mark"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 166 | _cm->markFromRoots(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | double mark_end_time = os::elapsedVTime(); |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 170 | jlong mark_end = os::elapsed_counter(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 171 | _vtime_mark_accum += (mark_end_time - cycle_start); |
| 172 | if (!cm()->has_aborted()) { |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 173 | delay_to_keep_mmu(g1_policy, true /* remark */); |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 174 | log_info(gc)("Concurrent Mark (%.3fs, %.3fs) %.3fms", |
| 175 | TimeHelper::counter_to_seconds(mark_start), |
| 176 | TimeHelper::counter_to_seconds(mark_end), |
| 177 | TimeHelper::counter_to_millis(mark_end - mark_start)); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 178 | |
| 179 | CMCheckpointRootsFinalClosure final_cl(_cm); |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 180 | VM_CGC_Operation op(&final_cl, "Pause Remark", true /* needs_pll */); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 181 | VMThread::execute(&op); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 182 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 183 | if (cm()->restart_for_overflow()) { |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 184 | log_debug(gc)("Restarting conc marking because of MS overflow in remark (restart #%d).", iter); |
| 185 | log_info(gc)("Concurrent Mark restart for overflow"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 186 | } |
| 187 | } while (cm()->restart_for_overflow()); |
John Cuthbertson | c8143a7 | 2011-10-20 12:06:20 -0700 | [diff] [blame] | 188 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 189 | double end_time = os::elapsedVTime(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 190 | // Update the total virtual time before doing this, since it will try |
| 191 | // to measure it to get the vtime for this marking. We purposely |
| 192 | // neglect the presumably-short "completeCleanup" phase here. |
| 193 | _vtime_accum = (end_time - _vtime_start); |
John Cuthbertson | 0fa6fc2 | 2012-01-12 00:06:47 -0800 | [diff] [blame] | 194 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 195 | if (!cm()->has_aborted()) { |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 196 | delay_to_keep_mmu(g1_policy, false /* cleanup */); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 197 | |
| 198 | CMCleanUp cl_cl(_cm); |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 199 | VM_CGC_Operation op(&cl_cl, "Pause Cleanup", false /* needs_pll */); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 200 | VMThread::execute(&op); |
| 201 | } else { |
John Cuthbertson | 861168c | 2011-11-28 09:49:05 -0800 | [diff] [blame] | 202 | // We don't want to update the marking status if a GC pause |
| 203 | // is already underway. |
Per Lidén | 95da544 | 2015-05-11 13:57:30 +0200 | [diff] [blame] | 204 | SuspendibleThreadSetJoiner sts_join; |
Derek White | 24c9ffe | 2015-06-05 10:27:41 +0200 | [diff] [blame] | 205 | g1h->collector_state()->set_mark_in_progress(false); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 206 | } |
| 207 | |
Antonios Printezis | 8bce4a6 | 2011-01-19 19:30:42 -0500 | [diff] [blame] | 208 | // Check if cleanup set the free_regions_coming flag. If it |
| 209 | // hasn't, we can just skip the next step. |
| 210 | if (g1h->free_regions_coming()) { |
| 211 | // The following will finish freeing up any regions that we |
| 212 | // found to be empty during cleanup. We'll do this part |
| 213 | // without joining the suspendible set. If an evacuation pause |
Antonios Printezis | 3ff554a | 2011-03-04 17:13:19 -0500 | [diff] [blame] | 214 | // takes place, then we would carry on freeing regions in |
Antonios Printezis | 8bce4a6 | 2011-01-19 19:30:42 -0500 | [diff] [blame] | 215 | // case they are needed by the pause. If a Full GC takes |
Antonios Printezis | 3ff554a | 2011-03-04 17:13:19 -0500 | [diff] [blame] | 216 | // place, it would wait for us to process the regions |
Antonios Printezis | 8bce4a6 | 2011-01-19 19:30:42 -0500 | [diff] [blame] | 217 | // reclaimed by cleanup. |
| 218 | |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 219 | GCTraceConcTime(Info, gc) tt("Concurrent Cleanup"); |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 220 | GCConcPhaseTimer(_cm, "Concurrent Cleanup"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 221 | |
Antonios Printezis | d1c6787 | 2011-10-13 13:54:29 -0400 | [diff] [blame] | 222 | // Now do the concurrent cleanup operation. |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 223 | _cm->completeCleanup(); |
Antonios Printezis | d18d952 | 2011-01-31 16:28:40 -0500 | [diff] [blame] | 224 | |
Antonios Printezis | d1c6787 | 2011-10-13 13:54:29 -0400 | [diff] [blame] | 225 | // Notify anyone who's waiting that there are no more free |
| 226 | // regions coming. We have to do this before we join the STS |
| 227 | // (in fact, we should not attempt to join the STS in the |
| 228 | // interval between finishing the cleanup pause and clearing |
| 229 | // the free_regions_coming flag) otherwise we might deadlock: |
| 230 | // a GC worker could be blocked waiting for the notification |
| 231 | // whereas this thread will be blocked for the pause to finish |
| 232 | // while it's trying to join the STS, which is conditional on |
| 233 | // the GC workers finishing. |
| 234 | g1h->reset_free_regions_coming(); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 235 | } |
Antonios Printezis | 8bce4a6 | 2011-01-19 19:30:42 -0500 | [diff] [blame] | 236 | guarantee(cm()->cleanup_list_is_empty(), |
| 237 | "at this point there should be no regions on the cleanup list"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 238 | |
Antonios Printezis | d1c6787 | 2011-10-13 13:54:29 -0400 | [diff] [blame] | 239 | // There is a tricky race before recording that the concurrent |
| 240 | // cleanup has completed and a potential Full GC starting around |
| 241 | // the same time. We want to make sure that the Full GC calls |
| 242 | // abort() on concurrent mark after |
| 243 | // record_concurrent_mark_cleanup_completed(), since abort() is |
| 244 | // the method that will reset the concurrent mark state. If we |
| 245 | // end up calling record_concurrent_mark_cleanup_completed() |
| 246 | // after abort() then we might incorrectly undo some of the work |
| 247 | // abort() did. Checking the has_aborted() flag after joining |
| 248 | // the STS allows the correct ordering of the two methods. There |
| 249 | // are two scenarios: |
| 250 | // |
| 251 | // a) If we reach here before the Full GC, the fact that we have |
| 252 | // joined the STS means that the Full GC cannot start until we |
| 253 | // leave the STS, so record_concurrent_mark_cleanup_completed() |
| 254 | // will complete before abort() is called. |
| 255 | // |
| 256 | // b) If we reach here during the Full GC, we'll be held up from |
| 257 | // joining the STS until the Full GC is done, which means that |
| 258 | // abort() will have completed and has_aborted() will return |
| 259 | // true to prevent us from calling |
| 260 | // record_concurrent_mark_cleanup_completed() (and, in fact, it's |
| 261 | // not needed any more as the concurrent mark state has been |
| 262 | // already reset). |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 263 | { |
Per Lidén | 95da544 | 2015-05-11 13:57:30 +0200 | [diff] [blame] | 264 | SuspendibleThreadSetJoiner sts_join; |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 265 | if (!cm()->has_aborted()) { |
| 266 | g1_policy->record_concurrent_mark_cleanup_completed(); |
Bengt Rutisson | 7f2ffe8 | 2015-06-23 13:26:05 +0200 | [diff] [blame] | 267 | } else { |
Bengt Rutisson | ffeb0bd | 2015-12-10 14:57:55 +0100 | [diff] [blame] | 268 | log_info(gc)("Concurrent Mark abort"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 269 | } |
| 270 | } |
| 271 | |
Antonios Printezis | d1c6787 | 2011-10-13 13:54:29 -0400 | [diff] [blame] | 272 | // We now want to allow clearing of the marking bitmap to be |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 273 | // suspended by a collection pause. |
Thomas Schatzl | 2e37a94 | 2014-07-21 09:59:46 +0200 | [diff] [blame] | 274 | // We may have aborted just before the remark. Do not bother clearing the |
| 275 | // bitmap then, as it has been done during mark abort. |
| 276 | if (!cm()->has_aborted()) { |
Sangheon Kim | 93bd48e | 2015-12-18 08:17:30 -0800 | [diff] [blame] | 277 | GCConcPhaseTimer(_cm, "Concurrent Bitmap Clearing"); |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 278 | _cm->clearNextBitmap(); |
Thomas Schatzl | 2e37a94 | 2014-07-21 09:59:46 +0200 | [diff] [blame] | 279 | } else { |
| 280 | assert(!G1VerifyBitmaps || _cm->nextMarkBitmapIsClear(), "Next mark bitmap must be clear"); |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 281 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 282 | } |
Antonios Printezis | dfc84e8 | 2010-06-28 14:13:17 -0400 | [diff] [blame] | 283 | |
| 284 | // Update the number of full collections that have been |
| 285 | // completed. This will also notify the FullGCCount_lock in case a |
| 286 | // Java thread is waiting for a full GC to happen (e.g., it |
| 287 | // called System.gc() with +ExplicitGCInvokesConcurrent). |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 288 | { |
Per Lidén | 95da544 | 2015-05-11 13:57:30 +0200 | [diff] [blame] | 289 | SuspendibleThreadSetJoiner sts_join; |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 290 | g1h->increment_old_marking_cycles_completed(true /* concurrent */); |
| 291 | g1h->register_concurrent_cycle_end(); |
| 292 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 293 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 294 | } |
| 295 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 296 | void ConcurrentMarkThread::stop() { |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 297 | { |
| 298 | MutexLockerEx ml(Terminator_lock); |
| 299 | _should_terminate = true; |
| 300 | } |
| 301 | |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 302 | stop_service(); |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 303 | |
| 304 | { |
| 305 | MutexLockerEx ml(Terminator_lock); |
| 306 | while (!_has_terminated) { |
| 307 | Terminator_lock->wait(); |
| 308 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 309 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Derek White | 3133bbb | 2015-10-26 12:22:24 -0400 | [diff] [blame] | 312 | void ConcurrentMarkThread::stop_service() { |
| 313 | MutexLockerEx ml(CGC_lock, Mutex::_no_safepoint_check_flag); |
| 314 | CGC_lock->notify_all(); |
| 315 | } |
| 316 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 317 | void ConcurrentMarkThread::sleepBeforeNextCycle() { |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 318 | // We join here because we don't want to do the "shouldConcurrentMark()" |
| 319 | // below while the world is otherwise stopped. |
John Cuthbertson | 20289fb | 2010-10-01 18:23:16 -0700 | [diff] [blame] | 320 | assert(!in_progress(), "should have been cleared"); |
| 321 | |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 322 | MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 323 | while (!started() && !_should_terminate) { |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 324 | CGC_lock->wait(Mutex::_no_safepoint_check_flag); |
| 325 | } |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 326 | |
| 327 | if (started()) { |
| 328 | set_in_progress(); |
Per Lidén | a3425b6 | 2014-04-11 11:00:12 +0200 | [diff] [blame] | 329 | } |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 330 | } |
| 331 | |
John Cuthbertson | c8143a7 | 2011-10-20 12:06:20 -0700 | [diff] [blame] | 332 | // Note: As is the case with CMS - this method, although exported |
| 333 | // by the ConcurrentMarkThread, which is a non-JavaThread, can only |
| 334 | // be called by a JavaThread. Currently this is done at vm creation |
| 335 | // time (post-vm-init) by the main/Primordial (Java)Thread. |
| 336 | // XXX Consider changing this in the future to allow the CM thread |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 337 | // itself to create this thread? |
| 338 | void ConcurrentMarkThread::makeSurrogateLockerThread(TRAPS) { |
John Cuthbertson | c8143a7 | 2011-10-20 12:06:20 -0700 | [diff] [blame] | 339 | assert(UseG1GC, "SLT thread needed only for concurrent GC"); |
| 340 | assert(THREAD->is_Java_thread(), "must be a Java thread"); |
Y. Srinivas Ramakrishna | 18f3386 | 2008-06-05 15:57:56 -0700 | [diff] [blame] | 341 | assert(_slt == NULL, "SLT already created"); |
| 342 | _slt = SurrogateLockerThread::make(THREAD); |
| 343 | } |