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src/share/vm/gc_implementation/shared/ageTable.hpp@595c0f60d50d (annotated)

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

Tue, 18 Mar 2014 19:07:22 +0100

author

pliden

date

Tue, 18 Mar 2014 19:07:22 +0100

changeset 6413

595c0f60d50d

parent 4129

22b8d3d181d9

child 6876

710a3c8b516e

child 7645

f2e3f0e1f97d

permissions

-rw-r--r--

8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1997, 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_SHARED_AGETABLE_HPP
stefank@2314	26	#define SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP
stefank@2314	27
stefank@2314	28	#include "oops/markOop.hpp"
stefank@2314	29	#include "oops/oop.hpp"
stefank@2314	30	#include "runtime/perfData.hpp"
stefank@2314	31
trims@1907	32	/* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
duke@435	33	See the LICENSE file for license information. */
duke@435	34
duke@435	35	// Age table for adaptive feedback-mediated tenuring (scavenging)
duke@435	36	//
duke@435	37	// Note: all sizes are in oops
duke@435	38
duke@435	39	class ageTable VALUE_OBJ_CLASS_SPEC {
duke@435	40	friend class VMStructs;
duke@435	41
duke@435	42	public:
duke@435	43	// constants
duke@435	44	enum { table_size = markOopDesc::max_age + 1 };
duke@435	45
duke@435	46	// instance variables
duke@435	47	size_t sizes[table_size];
duke@435	48
duke@435	49	// constructor. "global" indicates that this is the global age table
duke@435	50	// (as opposed to gc-thread-local)
duke@435	51	ageTable(bool global = true);
duke@435	52
duke@435	53	// clear table
duke@435	54	void clear();
duke@435	55
duke@435	56	// add entry
duke@435	57	void add(oop p, size_t oop_size) {
jwilhelm@4129	58	uint age = p->age();
duke@435	59	assert(age > 0 && age < table_size, "invalid age of object");
duke@435	60	sizes[age] += oop_size;
duke@435	61	}
duke@435	62
duke@435	63	// Merge another age table with the current one. Used
duke@435	64	// for parallel young generation gc.
duke@435	65	void merge(ageTable* subTable);
apetrusenko@980	66	void merge_par(ageTable* subTable);
duke@435	67
duke@435	68	// calculate new tenuring threshold based on age information
jwilhelm@4129	69	uint compute_tenuring_threshold(size_t survivor_capacity);
duke@435	70
duke@435	71	private:
duke@435	72	PerfVariable* _perf_sizes[table_size];
duke@435	73	};
stefank@2314	74
stefank@2314	75	#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_AGETABLE_HPP