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src/share/vm/gc_implementation/g1/g1CardCounts.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/g1CardCounts.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) 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
aoqi@0	28	#include "memory/allocation.hpp"
aoqi@0	29	#include "runtime/virtualspace.hpp"
aoqi@0	30	#include "utilities/globalDefinitions.hpp"
aoqi@0	31
aoqi@0	32	class CardTableModRefBS;
aoqi@0	33	class G1CollectedHeap;
aoqi@0	34	class HeapRegion;
aoqi@0	35
aoqi@0	36	// Table to track the number of times a card has been refined. Once
aoqi@0	37	// a card has been refined a certain number of times, it is
aoqi@0	38	// considered 'hot' and its refinement is delayed by inserting the
aoqi@0	39	// card into the hot card cache. The card will then be refined when
aoqi@0	40	// it is evicted from the hot card cache, or when the hot card cache
aoqi@0	41	// is 'drained' during the next evacuation pause.
aoqi@0	42
aoqi@0	43	class G1CardCounts: public CHeapObj<mtGC> {
aoqi@0	44	G1CollectedHeap* _g1h;
aoqi@0	45
aoqi@0	46	// The table of counts
aoqi@0	47	jubyte* _card_counts;
aoqi@0	48
aoqi@0	49	// Max capacity of the reserved space for the counts table
aoqi@0	50	size_t _reserved_max_card_num;
aoqi@0	51
aoqi@0	52	// Max capacity of the committed space for the counts table
aoqi@0	53	size_t _committed_max_card_num;
aoqi@0	54
aoqi@0	55	// Size of committed space for the counts table
aoqi@0	56	size_t _committed_size;
aoqi@0	57
aoqi@0	58	// CardTable bottom.
aoqi@0	59	const jbyte* _ct_bot;
aoqi@0	60
aoqi@0	61	// Barrier set
aoqi@0	62	CardTableModRefBS* _ct_bs;
aoqi@0	63
aoqi@0	64	// The virtual memory backing the counts table
aoqi@0	65	VirtualSpace _card_counts_storage;
aoqi@0	66
aoqi@0	67	// Returns true if the card counts table has been reserved.
aoqi@0	68	bool has_reserved_count_table() { return _card_counts != NULL; }
aoqi@0	69
aoqi@0	70	// Returns true if the card counts table has been reserved and committed.
aoqi@0	71	bool has_count_table() {
aoqi@0	72	return has_reserved_count_table() && _committed_max_card_num > 0;
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	size_t ptr_2_card_num(const jbyte* card_ptr) {
aoqi@0	76	assert(card_ptr >= _ct_bot,
aoqi@0	77	err_msg("Invalid card pointer: "
aoqi@0	78	"card_ptr: " PTR_FORMAT ", "
aoqi@0	79	"_ct_bot: " PTR_FORMAT,
aoqi@0	80	p2i(card_ptr), p2i(_ct_bot)));
aoqi@0	81	size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
aoqi@0	82	assert(card_num >= 0 && card_num < _committed_max_card_num,
aoqi@0	83	err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
aoqi@0	84	return card_num;
aoqi@0	85	}
aoqi@0	86
aoqi@0	87	jbyte* card_num_2_ptr(size_t card_num) {
aoqi@0	88	assert(card_num >= 0 && card_num < _committed_max_card_num,
aoqi@0	89	err_msg("card num out of range: "SIZE_FORMAT, card_num));
aoqi@0	90	return (jbyte*) (_ct_bot + card_num);
aoqi@0	91	}
aoqi@0	92
aoqi@0	93	// Helper routine.
aoqi@0	94	// Returns the number of cards that can be counted by the given committed
aoqi@0	95	// table size, with a maximum of the number of cards spanned by the max
aoqi@0	96	// capacity of the heap.
aoqi@0	97	size_t committed_to_card_num(size_t committed_size) {
aoqi@0	98	return MIN2(_reserved_max_card_num, committed_size / sizeof(jbyte));
aoqi@0	99	}
aoqi@0	100
aoqi@0	101	// Clear the counts table for the given (exclusive) index range.
aoqi@0	102	void clear_range(size_t from_card_num, size_t to_card_num);
aoqi@0	103
aoqi@0	104	public:
aoqi@0	105	G1CardCounts(G1CollectedHeap* g1h);
aoqi@0	106	~G1CardCounts();
aoqi@0	107
aoqi@0	108	void initialize();
aoqi@0	109
aoqi@0	110	// Resize the committed space for the card counts table in
aoqi@0	111	// response to a resize of the committed space for the heap.
aoqi@0	112	void resize(size_t heap_capacity);
aoqi@0	113
aoqi@0	114	// Increments the refinement count for the given card.
aoqi@0	115	// Returns the pre-increment count value.
aoqi@0	116	uint add_card_count(jbyte* card_ptr);
aoqi@0	117
aoqi@0	118	// Returns true if the given count is high enough to be considered
aoqi@0	119	// 'hot'; false otherwise.
aoqi@0	120	bool is_hot(uint count);
aoqi@0	121
aoqi@0	122	// Clears the card counts for the cards spanned by the region
aoqi@0	123	void clear_region(HeapRegion* hr);
aoqi@0	124
aoqi@0	125	// Clear the entire card counts table during GC.
aoqi@0	126	// Updates the policy stats with the duration.
aoqi@0	127	void clear_all();
aoqi@0	128	};
aoqi@0	129
aoqi@0	130	#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP