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8154736: enhancement of cmpxchg and copy_to_survivor for ppc64

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Reviewed-by: eosterlund, mdoerr, kbarrett
This commit is contained in:
Michihiro Horie 2018-06-05 09:29:15 +02:00
parent e4fc10b3c0
commit 1213297257
3 changed files with 21 additions and 9 deletions
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16
src/hotspot/share/oops/oop.inline.hpp
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@ -71,8 +71,8 @@ markOop oopDesc::cas_set_mark(markOop new_mark, markOop old_mark) {
return HeapAccess<>::atomic_cmpxchg_at(new_mark, as_oop(), mark_offset_in_bytes(), old_mark);
}
markOop oopDesc::cas_set_mark_raw(markOop new_mark, markOop old_mark) {
return Atomic::cmpxchg(new_mark, &_mark, old_mark);
markOop oopDesc::cas_set_mark_raw(markOop new_mark, markOop old_mark, atomic_memory_order order) {
return Atomic::cmpxchg(new_mark, &_mark, old_mark, order);
}
void oopDesc::init_mark() {
@ -342,14 +342,14 @@ void oopDesc::forward_to(oop p) {
}
// Used by parallel scavengers
bool oopDesc::cas_forward_to(oop p, markOop compare) {
bool oopDesc::cas_forward_to(oop p, markOop compare, atomic_memory_order order) {
assert(check_obj_alignment(p),
"forwarding to something not aligned");
assert(Universe::heap()->is_in_reserved(p),
"forwarding to something not in heap");
markOop m = markOopDesc::encode_pointer_as_mark(p);
assert(m->decode_pointer() == p, "encoding must be reversable");
return cas_set_mark_raw(m, compare) == compare;
return cas_set_mark_raw(m, compare, order) == compare;
}
oop oopDesc::forward_to_atomic(oop p) {
@ -381,6 +381,14 @@ oop oopDesc::forwardee() const {
return (oop) mark_raw()->decode_pointer();
}
// Note that the forwardee is not the same thing as the displaced_mark.
// The forwardee is used when copying during scavenge and mark-sweep.
// It does need to clear the low two locking- and GC-related bits.
oop oopDesc::forwardee_acquire() const {
markOop m = OrderAccess::load_acquire(&_mark);
return (oop) m->decode_pointer();
}
// The following method needs to be MT safe.
uint oopDesc::age() const {
assert(!is_forwarded(), "Attempt to read age from forwarded mark");