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src/share/vm/memory/referencePolicy.cpp@7ae4e26cb1e0 (annotated)

src/share/vm/memory/referencePolicy.cpp

Thu, 12 Oct 2017 21:27:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 21:27:07 +0800

changeset 7535

7ae4e26cb1e0

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "classfile/javaClasses.hpp"
aoqi@0	27	#include "memory/referencePolicy.hpp"
aoqi@0	28	#include "memory/universe.hpp"
aoqi@0	29	#include "runtime/arguments.hpp"
aoqi@0	30	#include "runtime/globals.hpp"
aoqi@0	31
aoqi@0	32	LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
aoqi@0	33	setup();
aoqi@0	34	}
aoqi@0	35
aoqi@0	36	// Capture state (of-the-VM) information needed to evaluate the policy
aoqi@0	37	void LRUCurrentHeapPolicy::setup() {
aoqi@0	38	_max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
aoqi@0	39	assert(_max_interval >= 0,"Sanity check");
aoqi@0	40	}
aoqi@0	41
aoqi@0	42	// The oop passed in is the SoftReference object, and not
aoqi@0	43	// the object the SoftReference points to.
aoqi@0	44	bool LRUCurrentHeapPolicy::should_clear_reference(oop p,
aoqi@0	45	jlong timestamp_clock) {
aoqi@0	46	jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);
aoqi@0	47	assert(interval >= 0, "Sanity check");
aoqi@0	48
aoqi@0	49	// The interval will be zero if the ref was accessed since the last scavenge/gc.
aoqi@0	50	if(interval <= _max_interval) {
aoqi@0	51	return false;
aoqi@0	52	}
aoqi@0	53
aoqi@0	54	return true;
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	/////////////////////// MaxHeap //////////////////////
aoqi@0	58
aoqi@0	59	LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
aoqi@0	60	setup();
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	// Capture state (of-the-VM) information needed to evaluate the policy
aoqi@0	64	void LRUMaxHeapPolicy::setup() {
aoqi@0	65	size_t max_heap = MaxHeapSize;
aoqi@0	66	max_heap -= Universe::get_heap_used_at_last_gc();
aoqi@0	67	max_heap /= M;
aoqi@0	68
aoqi@0	69	_max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
aoqi@0	70	assert(_max_interval >= 0,"Sanity check");
aoqi@0	71	}
aoqi@0	72
aoqi@0	73	// The oop passed in is the SoftReference object, and not
aoqi@0	74	// the object the SoftReference points to.
aoqi@0	75	bool LRUMaxHeapPolicy::should_clear_reference(oop p,
aoqi@0	76	jlong timestamp_clock) {
aoqi@0	77	jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p);
aoqi@0	78	assert(interval >= 0, "Sanity check");
aoqi@0	79
aoqi@0	80	// The interval will be zero if the ref was accessed since the last scavenge/gc.
aoqi@0	81	if(interval <= _max_interval) {
aoqi@0	82	return false;
aoqi@0	83	}
aoqi@0	84
aoqi@0	85	return true;
aoqi@0	86	}