author | iveresov |
Fri, 06 Mar 2009 13:50:14 -0800 | |
changeset 2142 | 032f4652700c |
parent 1374 | 4c24294029a9 |
child 2741 | 34e2a243d69a |
permissions | -rw-r--r-- |
1374 | 1 |
/* |
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* Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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#include "incls/_precompiled.incl" |
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#include "incls/_concurrentG1RefineThread.cpp.incl" |
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// ======= Concurrent Mark Thread ======== |
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// The CM thread is created when the G1 garbage collector is used |
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ConcurrentG1RefineThread:: |
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ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r) : |
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ConcurrentGCThread(), |
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_cg1r(cg1r), |
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_started(false), |
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_in_progress(false), |
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_do_traversal(false), |
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_vtime_accum(0.0), |
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_co_tracker(G1CRGroup), |
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_interval_ms(5.0) |
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{ |
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create_and_start(); |
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} |
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const long timeout = 200; // ms. |
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void ConcurrentG1RefineThread::traversalBasedRefinement() { |
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_cg1r->wait_for_ConcurrentG1Refine_enabled(); |
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MutexLocker x(G1ConcRefine_mon); |
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while (_cg1r->enabled()) { |
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MutexUnlocker ux(G1ConcRefine_mon); |
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ResourceMark rm; |
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HandleMark hm; |
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if (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine starting pass"); |
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_sts.join(); |
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bool no_sleep = _cg1r->refine(); |
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_sts.leave(); |
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if (!no_sleep) { |
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MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
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// We do this only for the timeout; we don't expect this to be signalled. |
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CGC_lock->wait(Mutex::_no_safepoint_check_flag, timeout); |
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} |
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} |
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} |
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void ConcurrentG1RefineThread::queueBasedRefinement() { |
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DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
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// Wait for completed log buffers to exist. |
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{ |
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MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); |
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while (!_do_traversal && !dcqs.process_completed_buffers() && |
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!_should_terminate) { |
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DirtyCardQ_CBL_mon->wait(Mutex::_no_safepoint_check_flag); |
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} |
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} |
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if (_should_terminate) { |
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return; |
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} |
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// Now we take them off (this doesn't hold locks while it applies |
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// closures.) (If we did a full collection, then we'll do a full |
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// traversal. |
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_sts.join(); |
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if (_do_traversal) { |
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(void)_cg1r->refine(); |
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switch (_cg1r->get_last_pya()) { |
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case PYA_cancel: case PYA_continue: |
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// Continue was caught and handled inside "refine". If it's still |
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// "continue" when we get here, we're done. |
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_do_traversal = false; |
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break; |
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case PYA_restart: |
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assert(_do_traversal, "Because of Full GC."); |
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break; |
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} |
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} else { |
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int n_logs = 0; |
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int lower_limit = 0; |
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double start_vtime_sec; // only used when G1SmoothConcRefine is on |
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int prev_buffer_num; // only used when G1SmoothConcRefine is on |
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if (G1SmoothConcRefine) { |
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lower_limit = 0; |
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start_vtime_sec = os::elapsedVTime(); |
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prev_buffer_num = (int) dcqs.completed_buffers_num(); |
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} else { |
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lower_limit = DCQBarrierProcessCompletedThreshold / 4; // For now. |
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} |
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while (dcqs.apply_closure_to_completed_buffer(0, lower_limit)) { |
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double end_vtime_sec; |
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double elapsed_vtime_sec; |
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int elapsed_vtime_ms; |
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int curr_buffer_num; |
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if (G1SmoothConcRefine) { |
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end_vtime_sec = os::elapsedVTime(); |
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elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; |
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elapsed_vtime_ms = (int) (elapsed_vtime_sec * 1000.0); |
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curr_buffer_num = (int) dcqs.completed_buffers_num(); |
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if (curr_buffer_num > prev_buffer_num || |
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curr_buffer_num > DCQBarrierProcessCompletedThreshold) { |
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decreaseInterval(elapsed_vtime_ms); |
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} else if (curr_buffer_num < prev_buffer_num) { |
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increaseInterval(elapsed_vtime_ms); |
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} |
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} |
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sample_young_list_rs_lengths(); |
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_co_tracker.update(false); |
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if (G1SmoothConcRefine) { |
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prev_buffer_num = curr_buffer_num; |
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_sts.leave(); |
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os::sleep(Thread::current(), (jlong) _interval_ms, false); |
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_sts.join(); |
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2142
032f4652700c
6720309: G1: don't synchronously update RSet during evacuation pauses
iveresov
parents:
1374
diff
changeset
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start_vtime_sec = os::elapsedVTime(); |
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} |
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n_logs++; |
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} |
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// Make sure we harvest the PYA, if any. |
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(void)_cg1r->get_pya(); |
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} |
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_sts.leave(); |
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} |
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void ConcurrentG1RefineThread::sample_young_list_rs_lengths() { |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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G1CollectorPolicy* g1p = g1h->g1_policy(); |
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if (g1p->adaptive_young_list_length()) { |
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int regions_visited = 0; |
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g1h->young_list_rs_length_sampling_init(); |
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while (g1h->young_list_rs_length_sampling_more()) { |
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g1h->young_list_rs_length_sampling_next(); |
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++regions_visited; |
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// we try to yield every time we visit 10 regions |
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if (regions_visited == 10) { |
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if (_sts.should_yield()) { |
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_sts.yield("G1 refine"); |
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// we just abandon the iteration |
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break; |
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} |
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regions_visited = 0; |
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} |
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} |
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g1p->check_prediction_validity(); |
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} |
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} |
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void ConcurrentG1RefineThread::run() { |
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initialize_in_thread(); |
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_vtime_start = os::elapsedVTime(); |
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wait_for_universe_init(); |
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_co_tracker.enable(); |
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_co_tracker.start(); |
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while (!_should_terminate) { |
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// wait until started is set. |
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if (G1RSBarrierUseQueue) { |
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queueBasedRefinement(); |
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} else { |
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traversalBasedRefinement(); |
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} |
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_sts.join(); |
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_co_tracker.update(); |
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_sts.leave(); |
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if (os::supports_vtime()) { |
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_vtime_accum = (os::elapsedVTime() - _vtime_start); |
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} else { |
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_vtime_accum = 0.0; |
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} |
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} |
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_sts.join(); |
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_co_tracker.update(true); |
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_sts.leave(); |
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assert(_should_terminate, "just checking"); |
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terminate(); |
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} |
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void ConcurrentG1RefineThread::yield() { |
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if (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine-yield"); |
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_sts.yield("G1 refine"); |
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if (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine-yield-end"); |
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} |
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void ConcurrentG1RefineThread::stop() { |
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// it is ok to take late safepoints here, if needed |
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{ |
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MutexLockerEx mu(Terminator_lock); |
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_should_terminate = true; |
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} |
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{ |
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MutexLockerEx x(DirtyCardQ_CBL_mon, Mutex::_no_safepoint_check_flag); |
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DirtyCardQ_CBL_mon->notify_all(); |
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} |
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{ |
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MutexLockerEx mu(Terminator_lock); |
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while (!_has_terminated) { |
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Terminator_lock->wait(); |
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} |
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} |
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if (TraceG1Refine) gclog_or_tty->print_cr("G1-Refine-stop"); |
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} |
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void ConcurrentG1RefineThread::print() { |
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gclog_or_tty->print("\"Concurrent G1 Refinement Thread\" "); |
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Thread::print(); |
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gclog_or_tty->cr(); |
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} |
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void ConcurrentG1RefineThread::set_do_traversal(bool b) { |
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_do_traversal = b; |
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} |