142 lines
5.5 KiB
C++
142 lines
5.5 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_G1CONCURRENTREFINE_HPP
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#define SHARE_GC_G1_G1CONCURRENTREFINE_HPP
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#include "memory/allocation.hpp"
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#include "utilities/globalDefinitions.hpp"
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// Forward decl
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class G1ConcurrentRefine;
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class G1ConcurrentRefineThread;
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class outputStream;
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class ThreadClosure;
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// Helper class for refinement thread management. Used to start, stop and
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// iterate over them.
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class G1ConcurrentRefineThreadControl {
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G1ConcurrentRefine* _cr;
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G1ConcurrentRefineThread** _threads;
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uint _num_max_threads;
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// Create the refinement thread for the given worker id.
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// If initializing is true, ignore InjectGCWorkerCreationFailure.
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G1ConcurrentRefineThread* create_refinement_thread(uint worker_id, bool initializing);
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public:
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G1ConcurrentRefineThreadControl();
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~G1ConcurrentRefineThreadControl();
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jint initialize(G1ConcurrentRefine* cr, uint num_max_threads);
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// If there is a "successor" thread that can be activated given the current id,
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// activate it.
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void maybe_activate_next(uint cur_worker_id);
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void print_on(outputStream* st) const;
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void worker_threads_do(ThreadClosure* tc);
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void stop();
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};
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// Controls refinement threads and their activation based on the number of
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// cards currently available in the global dirty card queue.
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// Refinement threads obtain work from the queue (a buffer at a time) based
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// on these thresholds. They are activated gradually based on the amount of
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// work to do.
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// Refinement thread n activates thread n+1 if the instance of this class determines there
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// is enough work available. Threads deactivate themselves if the current amount of
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// available cards falls below their individual threshold.
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class G1ConcurrentRefine : public CHeapObj<mtGC> {
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G1ConcurrentRefineThreadControl _thread_control;
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/*
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* The value of the completed dirty card queue length falls into one of 3 zones:
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* green, yellow, red. If the value is in [0, green) nothing is
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* done, the buffered cards are left unprocessed to enable the caching effect of the
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* dirtied cards. In the yellow zone [green, yellow) the concurrent refinement
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* threads are gradually activated. In [yellow, red) all threads are
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* running. If the length becomes red (max queue length) the mutators start
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* processing cards too.
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*
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* There are some interesting cases (when G1UseAdaptiveConcRefinement
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* is turned off):
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* 1) green = yellow = red = 0. In this case the mutator will process all
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* cards. Except for those that are created by the deferred updates
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* machinery during a collection.
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* 2) green = 0. Means no caching. Can be a good way to minimize the
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* amount of time spent updating remembered sets during a collection.
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*/
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size_t _green_zone;
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size_t _yellow_zone;
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size_t _red_zone;
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size_t _min_yellow_zone_size;
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G1ConcurrentRefine(size_t green_zone,
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size_t yellow_zone,
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size_t red_zone,
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size_t min_yellow_zone_size);
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// Update green/yellow/red zone values based on how well goals are being met.
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void update_zones(double logged_cards_scan_time,
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size_t processed_logged_cards,
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double goal_ms);
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static uint worker_id_offset();
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void maybe_activate_more_threads(uint worker_id, size_t num_cur_cards);
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jint initialize();
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public:
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~G1ConcurrentRefine();
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// Returns a G1ConcurrentRefine instance if succeeded to create/initialize the
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// G1ConcurrentRefine instance. Otherwise, returns NULL with error code.
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static G1ConcurrentRefine* create(jint* ecode);
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void stop();
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// Adjust refinement thresholds based on work done during the pause and the goal time.
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void adjust(double logged_cards_scan_time, size_t processed_logged_cards, double goal_ms);
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// Cards in the dirty card queue set.
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size_t activation_threshold(uint worker_id) const;
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size_t deactivation_threshold(uint worker_id) const;
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// Perform a single refinement step. Called by the refinement threads when woken up.
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bool do_refinement_step(uint worker_id);
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// Iterate over all concurrent refinement threads applying the given closure.
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void threads_do(ThreadClosure *tc);
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// Maximum number of refinement threads.
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static uint max_num_threads();
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void print_threads_on(outputStream* st) const;
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// Cards in the dirty card queue set.
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size_t green_zone() const { return _green_zone; }
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size_t yellow_zone() const { return _yellow_zone; }
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size_t red_zone() const { return _red_zone; }
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};
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#endif // SHARE_GC_G1_G1CONCURRENTREFINE_HPP
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