Fri, 15 Apr 2011 09:36:28 -0400
7032407: Crash in LinkResolver::runtime_resolve_virtual_method()
Summary: Make CDS reorder vtables so that dump time vtables match run time order, so when redefine classes reinitializes them, they aren't in the wrong order.
Reviewed-by: dcubed, acorn
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 */
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"
32 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
33 setup();
34 }
36 // Capture state (of-the-VM) information needed to evaluate the policy
37 void LRUCurrentHeapPolicy::setup() {
38 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
39 assert(_max_interval >= 0,"Sanity check");
40 }
42 // The oop passed in is the SoftReference object, and not
43 // the object the SoftReference points to.
44 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
45 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
46 assert(interval >= 0, "Sanity check");
48 // The interval will be zero if the ref was accessed since the last scavenge/gc.
49 if(interval <= _max_interval) {
50 return false;
51 }
53 return true;
54 }
56 /////////////////////// MaxHeap //////////////////////
58 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
59 setup();
60 }
62 // Capture state (of-the-VM) information needed to evaluate the policy
63 void LRUMaxHeapPolicy::setup() {
64 size_t max_heap = MaxHeapSize;
65 max_heap -= Universe::get_heap_used_at_last_gc();
66 max_heap /= M;
68 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
69 assert(_max_interval >= 0,"Sanity check");
70 }
72 // The oop passed in is the SoftReference object, and not
73 // the object the SoftReference points to.
74 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
75 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
76 assert(interval >= 0, "Sanity check");
78 // The interval will be zero if the ref was accessed since the last scavenge/gc.
79 if(interval <= _max_interval) {
80 return false;
81 }
83 return true;
84 }