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src/share/vm/gc_implementation/g1/g1CardCounts.hpp@7ae4e26cb1e0 (annotated)

src/share/vm/gc_implementation/g1/g1CardCounts.hpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 7257

e7d0505c8a30

parent 6876

710a3c8b516e

child 9448

73d689add964

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2013, 2014, 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_G1CARDCOUNTS_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
aoqi@0	27
tschatzl@7051	28	#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
aoqi@0	29	#include "memory/allocation.hpp"
aoqi@0	30	#include "runtime/virtualspace.hpp"
aoqi@0	31	#include "utilities/globalDefinitions.hpp"
aoqi@0	32
aoqi@0	33	class CardTableModRefBS;
tschatzl@7051	34	class G1CardCounts;
aoqi@0	35	class G1CollectedHeap;
tschatzl@7051	36	class G1RegionToSpaceMapper;
aoqi@0	37	class HeapRegion;
aoqi@0	38
tschatzl@7051	39	class G1CardCountsMappingChangedListener : public G1MappingChangedListener {
tschatzl@7051	40	private:
tschatzl@7051	41	G1CardCounts* _counts;
tschatzl@7051	42	public:
tschatzl@7051	43	void set_cardcounts(G1CardCounts* counts) { _counts = counts; }
tschatzl@7051	44
tschatzl@7257	45	virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
tschatzl@7051	46	};
tschatzl@7051	47
aoqi@0	48	// Table to track the number of times a card has been refined. Once
aoqi@0	49	// a card has been refined a certain number of times, it is
aoqi@0	50	// considered 'hot' and its refinement is delayed by inserting the
aoqi@0	51	// card into the hot card cache. The card will then be refined when
aoqi@0	52	// it is evicted from the hot card cache, or when the hot card cache
aoqi@0	53	// is 'drained' during the next evacuation pause.
aoqi@0	54
aoqi@0	55	class G1CardCounts: public CHeapObj<mtGC> {
tschatzl@7051	56	G1CardCountsMappingChangedListener _listener;
tschatzl@7051	57
aoqi@0	58	G1CollectedHeap* _g1h;
aoqi@0	59
aoqi@0	60	// The table of counts
aoqi@0	61	jubyte* _card_counts;
aoqi@0	62
aoqi@0	63	// Max capacity of the reserved space for the counts table
aoqi@0	64	size_t _reserved_max_card_num;
aoqi@0	65
aoqi@0	66	// CardTable bottom.
aoqi@0	67	const jbyte* _ct_bot;
aoqi@0	68
aoqi@0	69	// Barrier set
aoqi@0	70	CardTableModRefBS* _ct_bs;
aoqi@0	71
aoqi@0	72	// Returns true if the card counts table has been reserved.
aoqi@0	73	bool has_reserved_count_table() { return _card_counts != NULL; }
aoqi@0	74
aoqi@0	75	// Returns true if the card counts table has been reserved and committed.
aoqi@0	76	bool has_count_table() {
tschatzl@7051	77	return has_reserved_count_table();
aoqi@0	78	}
aoqi@0	79
aoqi@0	80	size_t ptr_2_card_num(const jbyte* card_ptr) {
aoqi@0	81	assert(card_ptr >= _ct_bot,
aoqi@0	82	err_msg("Invalid card pointer: "
aoqi@0	83	"card_ptr: " PTR_FORMAT ", "
aoqi@0	84	"_ct_bot: " PTR_FORMAT,
aoqi@0	85	p2i(card_ptr), p2i(_ct_bot)));
aoqi@0	86	size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
tschatzl@7051	87	assert(card_num >= 0 && card_num < _reserved_max_card_num,
aoqi@0	88	err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
aoqi@0	89	return card_num;
aoqi@0	90	}
aoqi@0	91
aoqi@0	92	jbyte* card_num_2_ptr(size_t card_num) {
tschatzl@7051	93	assert(card_num >= 0 && card_num < _reserved_max_card_num,
aoqi@0	94	err_msg("card num out of range: "SIZE_FORMAT, card_num));
aoqi@0	95	return (jbyte*) (_ct_bot + card_num);
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	// Clear the counts table for the given (exclusive) index range.
aoqi@0	99	void clear_range(size_t from_card_num, size_t to_card_num);
aoqi@0	100
aoqi@0	101	public:
aoqi@0	102	G1CardCounts(G1CollectedHeap* g1h);
aoqi@0	103
tschatzl@7051	104	void initialize(G1RegionToSpaceMapper* mapper);
aoqi@0	105
aoqi@0	106	// Increments the refinement count for the given card.
aoqi@0	107	// Returns the pre-increment count value.
aoqi@0	108	uint add_card_count(jbyte* card_ptr);
aoqi@0	109
aoqi@0	110	// Returns true if the given count is high enough to be considered
aoqi@0	111	// 'hot'; false otherwise.
aoqi@0	112	bool is_hot(uint count);
aoqi@0	113
aoqi@0	114	// Clears the card counts for the cards spanned by the region
aoqi@0	115	void clear_region(HeapRegion* hr);
aoqi@0	116
tschatzl@7051	117	// Clears the card counts for the cards spanned by the MemRegion
tschatzl@7051	118	void clear_range(MemRegion mr);
tschatzl@7051	119
aoqi@0	120	// Clear the entire card counts table during GC.
aoqi@0	121	void clear_all();
aoqi@0	122	};
aoqi@0	123
aoqi@0	124	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP