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src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp@da91efe96a93 (annotated)

src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp

Sat, 01 Sep 2012 13:25:18 -0400

author

coleenp

date

Sat, 01 Sep 2012 13:25:18 -0400

changeset 4037

da91efe96a93

parent 3294

bca17e38de00

child 4128

f81a7c0c618d

permissions

-rw-r--r--

6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>

duke@435	1	/*
jmasa@1967	2	* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
stefank@2314	27
stefank@2314	28	#include "memory/cardTableModRefBS.hpp"
stefank@2314	29
duke@435	30	class MutableSpace;
duke@435	31	class ObjectStartArray;
duke@435	32	class PSPromotionManager;
duke@435	33	class GCTaskQueue;
duke@435	34
duke@435	35	class CardTableExtension : public CardTableModRefBS {
duke@435	36	private:
duke@435	37	// Support methods for resizing the card table.
jmasa@1967	38	// resize_commit_uncommit() returns true if the pages were committed or
jmasa@1967	39	// uncommitted
jmasa@1967	40	bool resize_commit_uncommit(int changed_region, MemRegion new_region);
duke@435	41	void resize_update_card_table_entries(int changed_region,
duke@435	42	MemRegion new_region);
duke@435	43	void resize_update_committed_table(int changed_region, MemRegion new_region);
duke@435	44	void resize_update_covered_table(int changed_region, MemRegion new_region);
duke@435	45
duke@435	46	protected:
duke@435	47
duke@435	48	static void verify_all_young_refs_precise_helper(MemRegion mr);
duke@435	49
duke@435	50	public:
duke@435	51	enum ExtendedCardValue {
duke@435	52	youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
duke@435	53	verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
duke@435	54	};
duke@435	55
duke@435	56	CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
duke@435	57	CardTableModRefBS(whole_heap, max_covered_regions) { }
duke@435	58
duke@435	59	// Too risky for the 4/10/02 putback
duke@435	60	// BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
duke@435	61
duke@435	62	// Scavenge support
duke@435	63	void scavenge_contents(ObjectStartArray* start_array,
duke@435	64	MutableSpace* sp,
duke@435	65	HeapWord* space_top,
duke@435	66	PSPromotionManager* pm);
duke@435	67
duke@435	68	void scavenge_contents_parallel(ObjectStartArray* start_array,
duke@435	69	MutableSpace* sp,
duke@435	70	HeapWord* space_top,
duke@435	71	PSPromotionManager* pm,
jmasa@3294	72	uint stripe_number,
jmasa@3294	73	uint stripe_total);
duke@435	74
duke@435	75	// Verification
duke@435	76	static void verify_all_young_refs_imprecise();
duke@435	77	static void verify_all_young_refs_precise();
duke@435	78
duke@435	79	bool addr_is_marked_imprecise(void *addr);
duke@435	80	bool addr_is_marked_precise(void *addr);
duke@435	81
duke@435	82	void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
duke@435	83
duke@435	84	// Testers for entries
duke@435	85	static bool card_is_dirty(int value) { return value == dirty_card; }
duke@435	86	static bool card_is_newgen(int value) { return value == youngergen_card; }
duke@435	87	static bool card_is_clean(int value) { return value == clean_card; }
duke@435	88	static bool card_is_verify(int value) { return value == verify_card; }
duke@435	89
duke@435	90	// Card marking
coleenp@548	91	void inline_write_ref_field_gc(void* field, oop new_val) {
duke@435	92	jbyte* byte = byte_for(field);
duke@435	93	*byte = youngergen_card;
duke@435	94	}
duke@435	95
duke@435	96	// Adaptive size policy support
duke@435	97	// Allows adjustment of the base and size of the covered regions
duke@435	98	void resize_covered_region(MemRegion new_region);
duke@435	99	// Finds the covered region to resize based on the start address
duke@435	100	// of the covered regions.
duke@435	101	void resize_covered_region_by_start(MemRegion new_region);
duke@435	102	// Finds the covered region to resize based on the end address
duke@435	103	// of the covered regions.
duke@435	104	void resize_covered_region_by_end(int changed_region, MemRegion new_region);
duke@435	105	// Finds the lowest start address of a covered region that is
duke@435	106	// previous (i.e., lower index) to the covered region with index "ind".
duke@435	107	HeapWord* lowest_prev_committed_start(int ind) const;
duke@435	108
duke@435	109	#ifdef ASSERT
duke@435	110
duke@435	111	bool is_valid_card_address(jbyte* addr) {
duke@435	112	return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
duke@435	113	}
duke@435	114
duke@435	115	#endif // ASSERT
duke@435	116	};
stefank@2314	117
stefank@2314	118	#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP