a34e8be4f3
Wait on CGC_lock instead of sleeping to provide the delay. Reviewed-by: sangheki, sjohanss
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
/*
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* Copyright (c) 2001, 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_GC_G1_G1CONCURRENTMARKTHREAD_HPP
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#define SHARE_GC_G1_G1CONCURRENTMARKTHREAD_HPP
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#include "gc/shared/concurrentGCPhaseManager.hpp"
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#include "gc/shared/concurrentGCThread.hpp"
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class G1ConcurrentMark;
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class G1Policy;
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// The concurrent mark thread triggers the various steps of the concurrent marking
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// cycle, including various marking cleanup.
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class G1ConcurrentMarkThread: public ConcurrentGCThread {
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friend class VMStructs;
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double _vtime_start; // Initial virtual time.
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double _vtime_accum; // Accumulated virtual time.
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double _vtime_mark_accum;
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G1ConcurrentMark* _cm;
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enum State {
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Idle,
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Started,
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InProgress
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};
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volatile State _state;
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// WhiteBox testing support.
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ConcurrentGCPhaseManager::Stack _phase_manager_stack;
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void sleep_before_next_cycle();
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// Delay marking to meet MMU.
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void delay_to_keep_mmu(G1Policy* g1_policy, bool remark);
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double mmu_delay_end(G1Policy* g1_policy, bool remark);
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void run_service();
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void stop_service();
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public:
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// Constructor
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G1ConcurrentMarkThread(G1ConcurrentMark* cm);
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// Total virtual time so far for this thread and concurrent marking tasks.
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double vtime_accum();
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// Marking virtual time so far this thread and concurrent marking tasks.
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double vtime_mark_accum();
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G1ConcurrentMark* cm() { return _cm; }
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void set_idle() { assert(_state != Started, "must not be starting a new cycle"); _state = Idle; }
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bool idle() { return _state == Idle; }
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void set_started() { assert(_state == Idle, "cycle in progress"); _state = Started; }
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bool started() { return _state == Started; }
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void set_in_progress() { assert(_state == Started, "must be starting a cycle"); _state = InProgress; }
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bool in_progress() { return _state == InProgress; }
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// Returns true from the moment a marking cycle is
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// initiated (during the initial-mark pause when started() is set)
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// to the moment when the cycle completes (just after the next
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// marking bitmap has been cleared and in_progress() is
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// cleared). While during_cycle() is true we will not start another cycle
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// so that cycles do not overlap. We cannot use just in_progress()
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// as the CM thread might take some time to wake up before noticing
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// that started() is set and set in_progress().
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bool during_cycle() { return !idle(); }
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// WhiteBox testing support.
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bool request_concurrent_phase(const char* phase);
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ConcurrentGCPhaseManager::Stack* phase_manager_stack() {
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return &_phase_manager_stack;
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}
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};
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#endif // SHARE_GC_G1_G1CONCURRENTMARKTHREAD_HPP
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