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src/share/vm/gc_implementation/shared/ageTable.hpp@0fbdb4381b99 (annotated)

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

Mon, 09 Mar 2009 13:28:46 -0700

author

xdono

date

Mon, 09 Mar 2009 13:28:46 -0700

changeset 1014

0fbdb4381b99

parent 980

58054a18d735

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

duke@435	1	/*
xdono@1014	2	* Copyright 1997-2009 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
xdono@1014	25	/* Copyright 1992-2009 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);
apetrusenko@980	59	void merge_par(ageTable* subTable);
duke@435	60
duke@435	61	// calculate new tenuring threshold based on age information
duke@435	62	int compute_tenuring_threshold(size_t survivor_capacity);
duke@435	63
duke@435	64	private:
duke@435	65	PerfVariable* _perf_sizes[table_size];
duke@435	66	};