114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
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* Copyright (c) 2001, 2020, 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/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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G1ConcurrentMark* _cm;
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enum ServiceState : uint {
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Idle,
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FullMark,
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UndoMark
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};
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volatile ServiceState _state;
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// Wait for next cycle. Returns the command passed over.
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bool wait_for_next_cycle();
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bool mark_loop_needs_restart() const;
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// Phases and subphases for the full concurrent marking cycle in order.
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//
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// All these methods return true if the marking should be aborted. Except
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// phase_clear_cld_claimed_marks() because we must not abort before
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// scanning the root regions because of a potential deadlock otherwise.
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void phase_clear_cld_claimed_marks();
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bool phase_scan_root_regions();
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bool phase_mark_loop();
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bool subphase_mark_from_roots();
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bool subphase_preclean();
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bool subphase_delay_to_keep_mmu_before_remark();
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bool subphase_remark();
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bool phase_rebuild_remembered_sets();
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bool phase_delay_to_keep_mmu_before_cleanup();
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bool phase_cleanup();
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bool phase_clear_bitmap_for_next_mark();
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void concurrent_cycle_start();
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void concurrent_mark_cycle_do();
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void concurrent_undo_cycle_do();
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void concurrent_cycle_end(bool mark_cycle_completed);
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// Delay pauses to meet MMU.
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void delay_to_keep_mmu(bool remark);
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double mmu_delay_end(G1Policy* 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();
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void start_full_mark();
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void start_undo_mark();
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bool idle() const;
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// Returns true from the moment a concurrent cycle is
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// initiated (during the concurrent start 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).
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bool in_progress() const;
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};
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#endif // SHARE_GC_G1_G1CONCURRENTMARKTHREAD_HPP
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