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src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
aoqi@0	27
aoqi@0	28	#include "gc_implementation/g1/g1HotCardCache.hpp"
aoqi@0	29	#include "memory/allocation.hpp"
aoqi@0	30	#include "runtime/thread.hpp"
aoqi@0	31	#include "utilities/globalDefinitions.hpp"
aoqi@0	32
aoqi@0	33	// Forward decl
aoqi@0	34	class ConcurrentG1RefineThread;
aoqi@0	35	class G1CollectedHeap;
aoqi@0	36	class G1HotCardCache;
aoqi@0	37	class G1RemSet;
aoqi@0	38	class DirtyCardQueue;
aoqi@0	39
aoqi@0	40	class ConcurrentG1Refine: public CHeapObj<mtGC> {
aoqi@0	41	ConcurrentG1RefineThread** _threads;
aoqi@0	42	uint _n_threads;
aoqi@0	43	uint _n_worker_threads;
aoqi@0	44	/*
aoqi@0	45	* The value of the update buffer queue length falls into one of 3 zones:
aoqi@0	46	* green, yellow, red. If the value is in [0, green) nothing is
aoqi@0	47	* done, the buffers are left unprocessed to enable the caching effect of the
aoqi@0	48	* dirtied cards. In the yellow zone [green, yellow) the concurrent refinement
aoqi@0	49	* threads are gradually activated. In [yellow, red) all threads are
aoqi@0	50	* running. If the length becomes red (max queue length) the mutators start
aoqi@0	51	* processing the buffers.
aoqi@0	52	*
aoqi@0	53	* There are some interesting cases (when G1UseAdaptiveConcRefinement
aoqi@0	54	* is turned off):
aoqi@0	55	* 1) green = yellow = red = 0. In this case the mutator will process all
aoqi@0	56	* buffers. Except for those that are created by the deferred updates
aoqi@0	57	* machinery during a collection.
aoqi@0	58	* 2) green = 0. Means no caching. Can be a good way to minimize the
aoqi@0	59	* amount of time spent updating rsets during a collection.
aoqi@0	60	*/
aoqi@0	61	int _green_zone;
aoqi@0	62	int _yellow_zone;
aoqi@0	63	int _red_zone;
aoqi@0	64
aoqi@0	65	int _thread_threshold_step;
aoqi@0	66
aoqi@0	67	// We delay the refinement of 'hot' cards using the hot card cache.
aoqi@0	68	G1HotCardCache _hot_card_cache;
aoqi@0	69
aoqi@0	70	// Reset the threshold step value based of the current zone boundaries.
aoqi@0	71	void reset_threshold_step();
aoqi@0	72
aoqi@0	73	public:
aoqi@0	74	ConcurrentG1Refine(G1CollectedHeap* g1h);
aoqi@0	75	~ConcurrentG1Refine();
aoqi@0	76
aoqi@0	77	void init(); // Accomplish some initialization that has to wait.
aoqi@0	78	void stop();
aoqi@0	79
aoqi@0	80	void reinitialize_threads();
aoqi@0	81
aoqi@0	82	// Iterate over all concurrent refinement threads
aoqi@0	83	void threads_do(ThreadClosure *tc);
aoqi@0	84
aoqi@0	85	// Iterate over all worker refinement threads
aoqi@0	86	void worker_threads_do(ThreadClosure * tc);
aoqi@0	87
aoqi@0	88	// The RS sampling thread
aoqi@0	89	ConcurrentG1RefineThread * sampling_thread() const;
aoqi@0	90
aoqi@0	91	static uint thread_num();
aoqi@0	92
aoqi@0	93	void print_worker_threads_on(outputStream* st) const;
aoqi@0	94
aoqi@0	95	void set_green_zone(int x) { _green_zone = x; }
aoqi@0	96	void set_yellow_zone(int x) { _yellow_zone = x; }
aoqi@0	97	void set_red_zone(int x) { _red_zone = x; }
aoqi@0	98
aoqi@0	99	int green_zone() const { return _green_zone; }
aoqi@0	100	int yellow_zone() const { return _yellow_zone; }
aoqi@0	101	int red_zone() const { return _red_zone; }
aoqi@0	102
aoqi@0	103	uint total_thread_num() const { return _n_threads; }
aoqi@0	104	uint worker_thread_num() const { return _n_worker_threads; }
aoqi@0	105
aoqi@0	106	int thread_threshold_step() const { return _thread_threshold_step; }
aoqi@0	107
aoqi@0	108	G1HotCardCache* hot_card_cache() { return &_hot_card_cache; }
aoqi@0	109	};
aoqi@0	110
aoqi@0	111	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP