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8015486: PSScavenge::is_obj_in_young is unnecessarily slow with UseCompressedOops

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Compare compressed oops to a compressed young gen boundary instead of uncompressing the oops before doing the young gen boundary check.

Reviewed-by: brutisso, jmasa
This commit is contained in:
Stefan Karlsson 2013-05-30 10:58:16 +02:00
parent de314e391b
commit c39235c377
4 changed files with 35 additions and 22 deletions
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5
hotspot/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
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@ -61,6 +61,7 @@ CardTableExtension* PSScavenge::_card_table = NULL;
bool PSScavenge::_survivor_overflow = false;
uint PSScavenge::_tenuring_threshold = 0;
HeapWord* PSScavenge::_young_generation_boundary = NULL;
uintptr_t PSScavenge::_young_generation_boundary_compressed = 0;
elapsedTimer PSScavenge::_accumulated_time;
Stack<markOop, mtGC> PSScavenge::_preserved_mark_stack;
Stack<oop, mtGC> PSScavenge::_preserved_oop_stack;
@ -71,7 +72,7 @@ bool PSScavenge::_promotion_failed = false;
class PSIsAliveClosure: public BoolObjectClosure {
public:
bool do_object_b(oop p) {
return (!PSScavenge::is_obj_in_young((HeapWord*) p)) || p->is_forwarded();
return (!PSScavenge::is_obj_in_young(p)) || p->is_forwarded();
}
};
@ -815,7 +816,7 @@ void PSScavenge::initialize() {
// Set boundary between young_gen and old_gen
assert(old_gen->reserved().end() <= young_gen->eden_space()->bottom(),
"old above young");
_young_generation_boundary = young_gen->eden_space()->bottom();
set_young_generation_boundary(young_gen->eden_space()->bottom());
// Initialize ref handling object for scavenging.
MemRegion mr = young_gen->reserved();