Mercurial > hg > truffle
annotate src/share/vm/memory/referencePolicy.cpp @ 1839:e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.
Reviewed-by: johnc
author | ysr |
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date | Fri, 01 Oct 2010 16:12:54 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. |
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_referencePolicy.cpp.incl" | |
27 | |
28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() { | |
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29 setup(); |
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30 } |
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31 |
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32 // Capture state (of-the-VM) information needed to evaluate the policy |
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33 void LRUCurrentHeapPolicy::setup() { |
0 | 34 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB; |
35 assert(_max_interval >= 0,"Sanity check"); | |
36 } | |
37 | |
38 // The oop passed in is the SoftReference object, and not | |
39 // the object the SoftReference points to. | |
40 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) { | |
41 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); | |
42 assert(interval >= 0, "Sanity check"); | |
43 | |
44 // The interval will be zero if the ref was accessed since the last scavenge/gc. | |
45 if(interval <= _max_interval) { | |
46 return false; | |
47 } | |
48 | |
49 return true; | |
50 } | |
51 | |
52 /////////////////////// MaxHeap ////////////////////// | |
53 | |
54 LRUMaxHeapPolicy::LRUMaxHeapPolicy() { | |
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55 setup(); |
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56 } |
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57 |
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58 // Capture state (of-the-VM) information needed to evaluate the policy |
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59 void LRUMaxHeapPolicy::setup() { |
0 | 60 size_t max_heap = MaxHeapSize; |
61 max_heap -= Universe::get_heap_used_at_last_gc(); | |
62 max_heap /= M; | |
63 | |
64 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB; | |
65 assert(_max_interval >= 0,"Sanity check"); | |
66 } | |
67 | |
68 // The oop passed in is the SoftReference object, and not | |
69 // the object the SoftReference points to. | |
70 bool LRUMaxHeapPolicy::should_clear_reference(oop p) { | |
71 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); | |
72 assert(interval >= 0, "Sanity check"); | |
73 | |
74 // The interval will be zero if the ref was accessed since the last scavenge/gc. | |
75 if(interval <= _max_interval) { | |
76 return false; | |
77 } | |
78 | |
79 return true; | |
80 } |