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7041789: 30% perf regression with c2/arm following 7017732

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Implement a more accurate is_scavengable()

Reviewed-by: stefank, jcoomes, ysr
This commit is contained in:
Jon Masamitsu 2011-05-03 10:30:34 -07:00
parent 8cdd97938c
commit 6819e3739e
12 changed files with 132 additions and 36 deletions
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13
hotspot/src/share/vm/gc_interface/collectedHeap.hpp
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@ -269,6 +269,13 @@ class CollectedHeap : public CHeapObj {
// space). If you need the more conservative answer use is_permanent().
virtual bool is_in_permanent(const void *p) const = 0;
#ifdef ASSERT
// Returns true if "p" is in the part of the
// heap being collected.
virtual bool is_in_partial_collection(const void *p) = 0;
#endif
bool is_in_permanent_or_null(const void *p) const {
return p == NULL || is_in_permanent(p);
}
@ -284,11 +291,7 @@ class CollectedHeap : public CHeapObj {
// An object is scavengable if its location may move during a scavenge.
// (A scavenge is a GC which is not a full GC.)
// Currently, this just means it is not perm (and not null).
// This could change if we rethink what's in perm-gen.
bool is_scavengable(const void *p) const {
return !is_in_permanent_or_null(p);
}
virtual bool is_scavengable(const void *p) = 0;
// Returns "TRUE" if "p" is a method oop in the
// current heap, with high probability. This predicate