• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/gc_implementation/g1/satbQueue.hpp@04ff2f6cd0eb (annotated)

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

Tue, 17 Oct 2017 12:58:25 +0800

author

aoqi

date

Tue, 17 Oct 2017 12:58:25 +0800

changeset 7994

04ff2f6cd0eb

parent 7834

399885e13e90

parent 7535

7ae4e26cb1e0

permissions

-rw-r--r--

merge

aoqi@0	1	/*
kbarrett@7831	2	* Copyright (c) 2001, 2015, 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_SATBQUEUE_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP
aoqi@0	27
kbarrett@7834	28	#include "memory/allocation.hpp"
aoqi@0	29	#include "gc_implementation/g1/ptrQueue.hpp"
aoqi@0	30
aoqi@0	31	class JavaThread;
aoqi@0	32	class SATBMarkQueueSet;
aoqi@0	33
kbarrett@7834	34	// Base class for processing the contents of a SATB buffer.
kbarrett@7834	35	class SATBBufferClosure : public StackObj {
kbarrett@7834	36	protected:
kbarrett@7834	37	~SATBBufferClosure() { }
kbarrett@7834	38
kbarrett@7834	39	public:
kbarrett@7834	40	// Process the SATB entries in the designated buffer range.
kbarrett@7834	41	virtual void do_buffer(void** buffer, size_t size) = 0;
kbarrett@7834	42	};
kbarrett@7834	43
aoqi@0	44	// A ptrQueue whose elements are "oops", pointers to object heads.
aoqi@0	45	class ObjPtrQueue: public PtrQueue {
aoqi@0	46	friend class SATBMarkQueueSet;
aoqi@0	47
aoqi@0	48	private:
aoqi@0	49	// Filter out unwanted entries from the buffer.
aoqi@0	50	void filter();
aoqi@0	51
aoqi@0	52	public:
aoqi@0	53	ObjPtrQueue(PtrQueueSet* qset, bool perm = false) :
aoqi@0	54	// SATB queues are only active during marking cycles. We create
aoqi@0	55	// them with their active field set to false. If a thread is
aoqi@0	56	// created during a cycle and its SATB queue needs to be activated
aoqi@0	57	// before the thread starts running, we'll need to set its active
aoqi@0	58	// field to true. This is done in JavaThread::initialize_queues().
aoqi@0	59	PtrQueue(qset, perm, false /* active */) { }
aoqi@0	60
tschatzl@7445	61	// Process queue entries and free resources.
tschatzl@7445	62	void flush();
aoqi@0	63
kbarrett@7834	64	// Apply cl to the active part of the buffer.
kbarrett@7834	65	// Prerequisite: Must be at a safepoint.
kbarrett@7834	66	void apply_closure_and_empty(SATBBufferClosure* cl);
kbarrett@7834	67
aoqi@0	68	// Overrides PtrQueue::should_enqueue_buffer(). See the method's
aoqi@0	69	// definition for more information.
aoqi@0	70	virtual bool should_enqueue_buffer();
aoqi@0	71
aoqi@0	72	#ifndef PRODUCT
aoqi@0	73	// Helpful for debugging
aoqi@0	74	void print(const char* name);
aoqi@0	75	static void print(const char* name, void** buf, size_t index, size_t sz);
aoqi@0	76	#endif // PRODUCT
aoqi@0	77	};
aoqi@0	78
aoqi@0	79	class SATBMarkQueueSet: public PtrQueueSet {
aoqi@0	80	ObjPtrQueue _shared_satb_queue;
aoqi@0	81
aoqi@0	82	#ifdef ASSERT
aoqi@0	83	void dump_active_states(bool expected_active);
aoqi@0	84	void verify_active_states(bool expected_active);
aoqi@0	85	#endif // ASSERT
aoqi@0	86
aoqi@0	87	public:
aoqi@0	88	SATBMarkQueueSet();
aoqi@0	89
aoqi@0	90	void initialize(Monitor* cbl_mon, Mutex* fl_lock,
aoqi@0	91	int process_completed_threshold,
aoqi@0	92	Mutex* lock);
aoqi@0	93
aoqi@0	94	static void handle_zero_index_for_thread(JavaThread* t);
aoqi@0	95
aoqi@0	96	// Apply "set_active(active)" to all SATB queues in the set. It should be
aoqi@0	97	// called only with the world stopped. The method will assert that the
aoqi@0	98	// SATB queues of all threads it visits, as well as the SATB queue
aoqi@0	99	// set itself, has an active value same as expected_active.
aoqi@0	100	void set_active_all_threads(bool active, bool expected_active);
aoqi@0	101
aoqi@0	102	// Filter all the currently-active SATB buffers.
aoqi@0	103	void filter_thread_buffers();
aoqi@0	104
kbarrett@7834	105	// If there exists some completed buffer, pop and process it, and
kbarrett@7834	106	// return true. Otherwise return false. Processing a buffer
kbarrett@7834	107	// consists of applying the closure to the buffer range starting
kbarrett@7834	108	// with the first non-NULL entry to the end of the buffer; the
kbarrett@7834	109	// leading entries may be NULL due to filtering.
kbarrett@7834	110	bool apply_closure_to_completed_buffer(SATBBufferClosure* cl);
aoqi@0	111
aoqi@0	112	#ifndef PRODUCT
aoqi@0	113	// Helpful for debugging
aoqi@0	114	void print_all(const char* msg);
aoqi@0	115	#endif // PRODUCT
aoqi@0	116
aoqi@0	117	ObjPtrQueue* shared_satb_queue() { return &_shared_satb_queue; }
aoqi@0	118
aoqi@0	119	// If a marking is being abandoned, reset any unprocessed log buffers.
aoqi@0	120	void abandon_partial_marking();
aoqi@0	121	};
aoqi@0	122
aoqi@0	123	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_SATBQUEUE_HPP