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6962589: remove breadth first scanning code from parallel gc

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Remove the breadth-first copying order from ParallelScavenge and use depth-first by default.

Reviewed-by: jcoomes, ysr, johnc
This commit is contained in:
Antonios Printezis 2010-07-22 10:27:41 -04:00
parent 3a2b2b4fd8
commit 38ab95c64b
30 changed files with 63 additions and 541 deletions
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33
hotspot/src/share/vm/oops/instanceRefKlass.cpp
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@ -272,42 +272,9 @@ ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
#ifndef SERIALGC
template <class T>
void specialized_oop_copy_contents(instanceRefKlass *ref,
PSPromotionManager* pm, oop obj) {
assert(!pm->depth_first(), "invariant");
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
if (PSScavenge::should_scavenge(referent_addr)) {
ReferenceProcessor* rp = PSScavenge::reference_processor();
if (rp->discover_reference(obj, ref->reference_type())) {
// reference already enqueued, referent and next will be traversed later
ref->instanceKlass::oop_copy_contents(pm, obj);
return;
} else {
// treat referent as normal oop
pm->claim_or_forward_breadth(referent_addr);
}
}
// treat next as normal oop
T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
if (PSScavenge::should_scavenge(next_addr)) {
pm->claim_or_forward_breadth(next_addr);
}
ref->instanceKlass::oop_copy_contents(pm, obj);
}
void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
if (UseCompressedOops) {
specialized_oop_copy_contents<narrowOop>(this, pm, obj);
} else {
specialized_oop_copy_contents<oop>(this, pm, obj);
}
}
template <class T>
void specialized_oop_push_contents(instanceRefKlass *ref,
PSPromotionManager* pm, oop obj) {
assert(pm->depth_first(), "invariant");
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
if (PSScavenge::should_scavenge(referent_addr)) {
ReferenceProcessor* rp = PSScavenge::reference_processor();