Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.cpp @ 17546:46fa2940e686 jdk8u5-b07
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author | asaha |
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date | Sun, 02 Feb 2014 22:45:03 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "memory/referencePolicy.hpp" | |
28 #include "memory/universe.hpp" | |
29 #include "runtime/arguments.hpp" | |
30 #include "runtime/globals.hpp" | |
0 | 31 |
32 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() { | |
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33 setup(); |
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34 } |
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35 |
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36 // Capture state (of-the-VM) information needed to evaluate the policy |
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37 void LRUCurrentHeapPolicy::setup() { |
0 | 38 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB; |
39 assert(_max_interval >= 0,"Sanity check"); | |
40 } | |
41 | |
42 // The oop passed in is the SoftReference object, and not | |
43 // the object the SoftReference points to. | |
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44 bool LRUCurrentHeapPolicy::should_clear_reference(oop p, |
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45 jlong timestamp_clock) { |
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46 jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p); |
0 | 47 assert(interval >= 0, "Sanity check"); |
48 | |
49 // The interval will be zero if the ref was accessed since the last scavenge/gc. | |
50 if(interval <= _max_interval) { | |
51 return false; | |
52 } | |
53 | |
54 return true; | |
55 } | |
56 | |
57 /////////////////////// MaxHeap ////////////////////// | |
58 | |
59 LRUMaxHeapPolicy::LRUMaxHeapPolicy() { | |
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60 setup(); |
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61 } |
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62 |
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63 // Capture state (of-the-VM) information needed to evaluate the policy |
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64 void LRUMaxHeapPolicy::setup() { |
0 | 65 size_t max_heap = MaxHeapSize; |
66 max_heap -= Universe::get_heap_used_at_last_gc(); | |
67 max_heap /= M; | |
68 | |
69 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB; | |
70 assert(_max_interval >= 0,"Sanity check"); | |
71 } | |
72 | |
73 // The oop passed in is the SoftReference object, and not | |
74 // the object the SoftReference points to. | |
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75 bool LRUMaxHeapPolicy::should_clear_reference(oop p, |
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76 jlong timestamp_clock) { |
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77 jlong interval = timestamp_clock - java_lang_ref_SoftReference::timestamp(p); |
0 | 78 assert(interval >= 0, "Sanity check"); |
79 | |
80 // The interval will be zero if the ref was accessed since the last scavenge/gc. | |
81 if(interval <= _max_interval) { | |
82 return false; | |
83 } | |
84 | |
85 return true; | |
86 } |