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src/share/vm/memory/referencePolicy.hpp@fc9d8850ab8b (annotated)

src/share/vm/memory/referencePolicy.hpp

Fri, 23 Mar 2012 11:16:05 -0400

author

coleenp

date

Fri, 23 Mar 2012 11:16:05 -0400

changeset 3682

fc9d8850ab8b

parent 3188

d1bdeef3e3e2

child 3900

d2a62e0f25eb

permissions

-rw-r--r--

7150058: Allocate symbols from null boot loader to an arena for NMT
Summary: Move symbol allocation to an arena so NMT doesn't have to track them at startup.
Reviewed-by: never, kamg, zgu

duke@435	1	/*
johnc@3188	2	* Copyright (c) 2000, 2011, 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_MEMORY_REFERENCEPOLICY_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_REFERENCEPOLICY_HPP
stefank@2314	27
duke@435	28	// referencePolicy is used to determine when soft reference objects
duke@435	29	// should be cleared.
duke@435	30
duke@435	31
ysr@888	32	class ReferencePolicy : public CHeapObj {
duke@435	33	public:
johnc@3188	34	virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
johnc@3188	35	ShouldNotReachHere();
johnc@3188	36	return true;
johnc@3188	37	}
johnc@3188	38
ysr@888	39	// Capture state (of-the-VM) information needed to evaluate the policy
ysr@892	40	virtual void setup() { /* do nothing */ }
duke@435	41	};
duke@435	42
duke@435	43	class NeverClearPolicy : public ReferencePolicy {
duke@435	44	public:
johnc@3188	45	virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
johnc@3188	46	return false;
johnc@3188	47	}
duke@435	48	};
duke@435	49
duke@435	50	class AlwaysClearPolicy : public ReferencePolicy {
duke@435	51	public:
johnc@3188	52	virtual bool should_clear_reference(oop p, jlong timestamp_clock) {
johnc@3188	53	return true;
johnc@3188	54	}
duke@435	55	};
duke@435	56
duke@435	57	class LRUCurrentHeapPolicy : public ReferencePolicy {
duke@435	58	private:
duke@435	59	jlong _max_interval;
duke@435	60
duke@435	61	public:
duke@435	62	LRUCurrentHeapPolicy();
duke@435	63
ysr@888	64	// Capture state (of-the-VM) information needed to evaluate the policy
ysr@892	65	void setup();
johnc@3188	66	virtual bool should_clear_reference(oop p, jlong timestamp_clock);
duke@435	67	};
duke@435	68
duke@435	69	class LRUMaxHeapPolicy : public ReferencePolicy {
duke@435	70	private:
duke@435	71	jlong _max_interval;
duke@435	72
duke@435	73	public:
duke@435	74	LRUMaxHeapPolicy();
duke@435	75
ysr@888	76	// Capture state (of-the-VM) information needed to evaluate the policy
ysr@892	77	void setup();
johnc@3188	78	virtual bool should_clear_reference(oop p, jlong timestamp_clock);
duke@435	79	};
stefank@2314	80
stefank@2314	81	#endif // SHARE_VM_MEMORY_REFERENCEPOLICY_HPP