0fa6fc2279
Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked. Reviewed-by: brutisso, tonyp
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
/*
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* Copyright (c) 2001, 2012, 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_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
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#include "gc_implementation/shared/concurrentGCThread.hpp"
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// The Concurrent Mark GC Thread (could be several in the future).
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// This is copied from the Concurrent Mark Sweep GC Thread
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// Still under construction.
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class ConcurrentMark;
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class ConcurrentMarkThread: 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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public:
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virtual void run();
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private:
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ConcurrentMark* _cm;
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volatile bool _started;
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volatile bool _in_progress;
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void sleepBeforeNextCycle();
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static SurrogateLockerThread* _slt;
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public:
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// Constructor
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ConcurrentMarkThread(ConcurrentMark* cm);
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static void makeSurrogateLockerThread(TRAPS);
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static SurrogateLockerThread* slt() { return _slt; }
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// Printing
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void print_on(outputStream* st) const;
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void print() const;
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// Total virtual time so far.
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double vtime_accum();
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// Marking virtual time so far
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double vtime_mark_accum();
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ConcurrentMark* cm() { return _cm; }
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void set_started() { assert(!_in_progress, "cycle in progress"); _started = true; }
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void clear_started() { assert(_in_progress, "must be starting a cycle"); _started = false; }
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bool started() { return _started; }
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void set_in_progress() { assert(_started, "must be starting a cycle"); _in_progress = true; }
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void clear_in_progress() { assert(!_started, "must not be starting a new cycle"); _in_progress = false; }
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bool in_progress() { return _in_progress; }
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// This flag 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 this flag 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 started() || in_progress(); }
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// Yield for GC
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void yield();
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// shutdown
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void stop();
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARKTHREAD_HPP
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