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src/share/vm/gc_implementation/shared/ageTable.hpp@ba764ed4b6f2 (annotated)

src/share/vm/gc_implementation/shared/ageTable.hpp

Sun, 13 Apr 2008 17:43:42 -0400

author

coleenp

date

Sun, 13 Apr 2008 17:43:42 -0400

changeset 548

ba764ed4b6f2

parent 435

a61af66fc99e

child 980

58054a18d735

permissions

-rw-r--r--

6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold

duke@435	1	/*
duke@435	2	* Copyright 1997-2003 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	/* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
duke@435	26	See the LICENSE file for license information. */
duke@435	27
duke@435	28	// Age table for adaptive feedback-mediated tenuring (scavenging)
duke@435	29	//
duke@435	30	// Note: all sizes are in oops
duke@435	31
duke@435	32	class ageTable VALUE_OBJ_CLASS_SPEC {
duke@435	33	friend class VMStructs;
duke@435	34
duke@435	35	public:
duke@435	36	// constants
duke@435	37	enum { table_size = markOopDesc::max_age + 1 };
duke@435	38
duke@435	39	// instance variables
duke@435	40	size_t sizes[table_size];
duke@435	41
duke@435	42	// constructor. "global" indicates that this is the global age table
duke@435	43	// (as opposed to gc-thread-local)
duke@435	44	ageTable(bool global = true);
duke@435	45
duke@435	46	// clear table
duke@435	47	void clear();
duke@435	48
duke@435	49	// add entry
duke@435	50	void add(oop p, size_t oop_size) {
duke@435	51	int age = p->age();
duke@435	52	assert(age > 0 && age < table_size, "invalid age of object");
duke@435	53	sizes[age] += oop_size;
duke@435	54	}
duke@435	55
duke@435	56	// Merge another age table with the current one. Used
duke@435	57	// for parallel young generation gc.
duke@435	58	void merge(ageTable* subTable);
duke@435	59
duke@435	60	// calculate new tenuring threshold based on age information
duke@435	61	int compute_tenuring_threshold(size_t survivor_capacity);
duke@435	62
duke@435	63	private:
duke@435	64	PerfVariable* _perf_sizes[table_size];
duke@435	65	};