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src/share/vm/gc_implementation/g1/g1CardCounts.cpp@73d689add964 (annotated)

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

Thu, 27 Dec 2018 11:43:33 +0800

author

aoqi

date

Thu, 27 Dec 2018 11:43:33 +0800

changeset 9448

73d689add964

parent 9327

f96fcd9e1e1b

parent 7535

7ae4e26cb1e0

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	#include "precompiled.hpp"
aoqi@0	26	#include "gc_implementation/g1/g1CardCounts.hpp"
aoqi@0	27	#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
aoqi@0	28	#include "gc_implementation/g1/g1CollectorPolicy.hpp"
aoqi@0	29	#include "gc_implementation/g1/g1GCPhaseTimes.hpp"
aoqi@0	30	#include "memory/cardTableModRefBS.hpp"
aoqi@0	31	#include "services/memTracker.hpp"
aoqi@0	32	#include "utilities/copy.hpp"
aoqi@0	33
aoqi@0	34	PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
aoqi@0	35
tschatzl@7257	36	void G1CardCountsMappingChangedListener::on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
tschatzl@7257	37	if (zero_filled) {
tschatzl@7257	38	return;
tschatzl@7257	39	}
tschatzl@7051	40	MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_idx), num_regions * HeapRegion::GrainWords);
tschatzl@7051	41	_counts->clear_range(mr);
tschatzl@7051	42	}
tschatzl@7051	43
aoqi@0	44	void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) {
aoqi@0	45	if (has_count_table()) {
aoqi@0	46	assert(from_card_num < to_card_num,
kevinw@9327	47	err_msg("Wrong order? from: " SIZE_FORMAT ", to: " SIZE_FORMAT,
aoqi@0	48	from_card_num, to_card_num));
aoqi@0	49	Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num));
aoqi@0	50	}
aoqi@0	51	}
aoqi@0	52
aoqi@0	53	G1CardCounts::G1CardCounts(G1CollectedHeap *g1h):
tschatzl@7051	54	_listener(), _g1h(g1h), _card_counts(NULL), _reserved_max_card_num(0) {
tschatzl@7051	55	_listener.set_cardcounts(this);
tschatzl@7051	56	}
aoqi@0	57
tschatzl@7051	58	void G1CardCounts::initialize(G1RegionToSpaceMapper* mapper) {
aoqi@0	59	assert(_g1h->max_capacity() > 0, "initialization order");
aoqi@0	60	assert(_g1h->capacity() == 0, "initialization order");
aoqi@0	61
aoqi@0	62	if (G1ConcRSHotCardLimit > 0) {
aoqi@0	63	// The max value we can store in the counts table is
aoqi@0	64	// max_jubyte. Guarantee the value of the hot
aoqi@0	65	// threshold limit is no more than this.
aoqi@0	66	guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity");
aoqi@0	67
aoqi@0	68	_ct_bs = _g1h->g1_barrier_set();
aoqi@0	69	_ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());
aoqi@0	70
tschatzl@7051	71	_card_counts = (jubyte*) mapper->reserved().start();
tschatzl@7051	72	_reserved_max_card_num = mapper->reserved().byte_size();
tschatzl@7051	73	mapper->set_mapping_changed_listener(&_listener);
aoqi@0	74	}
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	uint G1CardCounts::add_card_count(jbyte* card_ptr) {
aoqi@0	78	// Returns the number of times the card has been refined.
aoqi@0	79	// If we failed to reserve/commit the counts table, return 0.
aoqi@0	80	// If card_ptr is beyond the committed end of the counts table,
aoqi@0	81	// return 0.
aoqi@0	82	// Otherwise return the actual count.
aoqi@0	83	// Unless G1ConcRSHotCardLimit has been set appropriately,
aoqi@0	84	// returning 0 will result in the card being considered
aoqi@0	85	// cold and will be refined immediately.
aoqi@0	86	uint count = 0;
aoqi@0	87	if (has_count_table()) {
aoqi@0	88	size_t card_num = ptr_2_card_num(card_ptr);
tschatzl@7051	89	assert(card_num < _reserved_max_card_num,
kevinw@9327	90	err_msg("Card " SIZE_FORMAT " outside of card counts table (max size " SIZE_FORMAT ")",
tschatzl@7051	91	card_num, _reserved_max_card_num));
tschatzl@7051	92	count = (uint) _card_counts[card_num];
tschatzl@7051	93	if (count < G1ConcRSHotCardLimit) {
tschatzl@7051	94	_card_counts[card_num] =
tschatzl@7051	95	(jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit));
aoqi@0	96	}
aoqi@0	97	}
aoqi@0	98	return count;
aoqi@0	99	}
aoqi@0	100
aoqi@0	101	bool G1CardCounts::is_hot(uint count) {
aoqi@0	102	return (count >= G1ConcRSHotCardLimit);
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	void G1CardCounts::clear_region(HeapRegion* hr) {
tschatzl@7051	106	MemRegion mr(hr->bottom(), hr->end());
tschatzl@7051	107	clear_range(mr);
tschatzl@7051	108	}
tschatzl@7051	109
tschatzl@7051	110	void G1CardCounts::clear_range(MemRegion mr) {
aoqi@0	111	if (has_count_table()) {
tschatzl@7051	112	const jbyte* from_card_ptr = _ct_bs->byte_for_const(mr.start());
tschatzl@7051	113	// We use the last address in the range as the range could represent the
tschatzl@7051	114	// last region in the heap. In which case trying to find the card will be an
tschatzl@7051	115	// OOB access to the card table.
tschatzl@7051	116	const jbyte* last_card_ptr = _ct_bs->byte_for_const(mr.last());
aoqi@0	117
aoqi@0	118	#ifdef ASSERT
aoqi@0	119	HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr);
tschatzl@7051	120	assert(start_addr == mr.start(), "MemRegion start must be aligned to a card.");
aoqi@0	121	HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr);
tschatzl@7051	122	assert((last_addr + CardTableModRefBS::card_size_in_words) == mr.end(), "MemRegion end must be aligned to a card.");
aoqi@0	123	#endif // ASSERT
aoqi@0	124
aoqi@0	125	// Clear the counts for the (exclusive) card range.
aoqi@0	126	size_t from_card_num = ptr_2_card_num(from_card_ptr);
aoqi@0	127	size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1;
aoqi@0	128	clear_range(from_card_num, to_card_num);
aoqi@0	129	}
aoqi@0	130	}
aoqi@0	131
tschatzl@7051	132	class G1CardCountsClearClosure : public HeapRegionClosure {
tschatzl@7051	133	private:
tschatzl@7051	134	G1CardCounts* _card_counts;
tschatzl@7051	135	public:
tschatzl@7051	136	G1CardCountsClearClosure(G1CardCounts* card_counts) :
tschatzl@7051	137	HeapRegionClosure(), _card_counts(card_counts) { }
tschatzl@7051	138
tschatzl@7051	139
tschatzl@7051	140	virtual bool doHeapRegion(HeapRegion* r) {
tschatzl@7051	141	_card_counts->clear_region(r);
tschatzl@7051	142	return false;
tschatzl@7051	143	}
tschatzl@7051	144	};
tschatzl@7051	145
aoqi@0	146	void G1CardCounts::clear_all() {
aoqi@0	147	assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise");
tschatzl@7051	148	G1CardCountsClearClosure cl(this);
tschatzl@7051	149	_g1h->heap_region_iterate(&cl);
aoqi@0	150	}