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src/share/vm/memory/referencePolicy.cpp@d1605aabd0a1 (annotated)

src/share/vm/memory/referencePolicy.cpp

Wed, 02 Jul 2008 12:55:16 -0700

author

xdono

date

Wed, 02 Jul 2008 12:55:16 -0700

changeset 631

d1605aabd0a1

parent 435

a61af66fc99e

child 888

c96030fff130

permissions

-rw-r--r--

6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

duke@435	1	/*
duke@435	2	* Copyright 2000-2003 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	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_referencePolicy.cpp.incl"
duke@435	27
duke@435	28	LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
duke@435	29	_max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
duke@435	30	assert(_max_interval >= 0,"Sanity check");
duke@435	31	}
duke@435	32
duke@435	33	// The oop passed in is the SoftReference object, and not
duke@435	34	// the object the SoftReference points to.
duke@435	35	bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
duke@435	36	jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
duke@435	37	assert(interval >= 0, "Sanity check");
duke@435	38
duke@435	39	// The interval will be zero if the ref was accessed since the last scavenge/gc.
duke@435	40	if(interval <= _max_interval) {
duke@435	41	return false;
duke@435	42	}
duke@435	43
duke@435	44	return true;
duke@435	45	}
duke@435	46
duke@435	47	/////////////////////// MaxHeap //////////////////////
duke@435	48
duke@435	49	LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
duke@435	50	size_t max_heap = MaxHeapSize;
duke@435	51	max_heap -= Universe::get_heap_used_at_last_gc();
duke@435	52	max_heap /= M;
duke@435	53
duke@435	54	_max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
duke@435	55	assert(_max_interval >= 0,"Sanity check");
duke@435	56	}
duke@435	57
duke@435	58	// The oop passed in is the SoftReference object, and not
duke@435	59	// the object the SoftReference points to.
duke@435	60	bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
duke@435	61	jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
duke@435	62	assert(interval >= 0, "Sanity check");
duke@435	63
duke@435	64	// The interval will be zero if the ref was accessed since the last scavenge/gc.
duke@435	65	if(interval <= _max_interval) {
duke@435	66	return false;
duke@435	67	}
duke@435	68
duke@435	69	return true;
duke@435	70	}