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src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp@0f773163217d (annotated)

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

Thu, 11 Dec 2008 12:05:21 -0800

author

jcoomes

date

Thu, 11 Dec 2008 12:05:21 -0800

changeset 918

0f773163217d

parent 631

d1605aabd0a1

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6765954: par compact - stress mode for splitting young gen spaces
Reviewed-by: jmasa

duke@435	1	/*
xdono@631	2	* Copyright 2001-2008 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	class MutableSpace;
duke@435	26	class ObjectStartArray;
duke@435	27	class PSPromotionManager;
duke@435	28	class GCTaskQueue;
duke@435	29
duke@435	30	class CardTableExtension : public CardTableModRefBS {
duke@435	31	private:
duke@435	32	// Support methods for resizing the card table.
duke@435	33	void resize_commit_uncommit(int changed_region, MemRegion new_region);
duke@435	34	void resize_update_card_table_entries(int changed_region,
duke@435	35	MemRegion new_region);
duke@435	36	void resize_update_committed_table(int changed_region, MemRegion new_region);
duke@435	37	void resize_update_covered_table(int changed_region, MemRegion new_region);
duke@435	38
duke@435	39	protected:
duke@435	40
duke@435	41	static void verify_all_young_refs_precise_helper(MemRegion mr);
duke@435	42
duke@435	43	public:
duke@435	44	enum ExtendedCardValue {
duke@435	45	youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
duke@435	46	verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
duke@435	47	};
duke@435	48
duke@435	49	CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
duke@435	50	CardTableModRefBS(whole_heap, max_covered_regions) { }
duke@435	51
duke@435	52	// Too risky for the 4/10/02 putback
duke@435	53	// BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
duke@435	54
duke@435	55	// Scavenge support
duke@435	56	void scavenge_contents(ObjectStartArray* start_array,
duke@435	57	MutableSpace* sp,
duke@435	58	HeapWord* space_top,
duke@435	59	PSPromotionManager* pm);
duke@435	60
duke@435	61	void scavenge_contents_parallel(ObjectStartArray* start_array,
duke@435	62	MutableSpace* sp,
duke@435	63	HeapWord* space_top,
duke@435	64	PSPromotionManager* pm,
duke@435	65	uint stripe_number);
duke@435	66
duke@435	67	// Verification
duke@435	68	static void verify_all_young_refs_imprecise();
duke@435	69	static void verify_all_young_refs_precise();
duke@435	70
duke@435	71	bool addr_is_marked_imprecise(void *addr);
duke@435	72	bool addr_is_marked_precise(void *addr);
duke@435	73
duke@435	74	void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
duke@435	75
duke@435	76	// Testers for entries
duke@435	77	static bool card_is_dirty(int value) { return value == dirty_card; }
duke@435	78	static bool card_is_newgen(int value) { return value == youngergen_card; }
duke@435	79	static bool card_is_clean(int value) { return value == clean_card; }
duke@435	80	static bool card_is_verify(int value) { return value == verify_card; }
duke@435	81
duke@435	82	// Card marking
coleenp@548	83	void inline_write_ref_field_gc(void* field, oop new_val) {
duke@435	84	jbyte* byte = byte_for(field);
duke@435	85	*byte = youngergen_card;
duke@435	86	}
duke@435	87
duke@435	88	// Adaptive size policy support
duke@435	89	// Allows adjustment of the base and size of the covered regions
duke@435	90	void resize_covered_region(MemRegion new_region);
duke@435	91	// Finds the covered region to resize based on the start address
duke@435	92	// of the covered regions.
duke@435	93	void resize_covered_region_by_start(MemRegion new_region);
duke@435	94	// Finds the covered region to resize based on the end address
duke@435	95	// of the covered regions.
duke@435	96	void resize_covered_region_by_end(int changed_region, MemRegion new_region);
duke@435	97	// Finds the lowest start address of a covered region that is
duke@435	98	// previous (i.e., lower index) to the covered region with index "ind".
duke@435	99	HeapWord* lowest_prev_committed_start(int ind) const;
duke@435	100
duke@435	101	#ifdef ASSERT
duke@435	102
duke@435	103	bool is_valid_card_address(jbyte* addr) {
duke@435	104	return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
duke@435	105	}
duke@435	106
duke@435	107	#endif // ASSERT
duke@435	108	};