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1 /*
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2 * Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_referencePolicy.cpp.incl"
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27
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28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
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29 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
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30 assert(_max_interval >= 0,"Sanity check");
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31 }
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32
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33 // The oop passed in is the SoftReference object, and not
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34 // the object the SoftReference points to.
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35 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
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36 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
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37 assert(interval >= 0, "Sanity check");
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38
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39 // The interval will be zero if the ref was accessed since the last scavenge/gc.
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40 if(interval <= _max_interval) {
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41 return false;
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42 }
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43
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44 return true;
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45 }
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46
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47 /////////////////////// MaxHeap //////////////////////
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48
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49 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
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50 size_t max_heap = MaxHeapSize;
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51 max_heap -= Universe::get_heap_used_at_last_gc();
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52 max_heap /= M;
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53
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54 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
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55 assert(_max_interval >= 0,"Sanity check");
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56 }
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57
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58 // The oop passed in is the SoftReference object, and not
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59 // the object the SoftReference points to.
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60 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
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61 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
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62 assert(interval >= 0, "Sanity check");
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63
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64 // The interval will be zero if the ref was accessed since the last scavenge/gc.
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65 if(interval <= _max_interval) {
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66 return false;
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67 }
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68
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69 return true;
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70 }
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