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6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning

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6889757: G1: enable card mark elision for initializing writes from compiled code (ReduceInitialCardMarks)

Defer the (compiler-elided) card-mark upon a slow-path allocation until after the store  and before the next subsequent safepoint; G1 now answers yes to can_elide_tlab_write_barriers().

Reviewed-by: jcoomes, kvn, never
This commit is contained in:
Y. Srinivas Ramakrishna 2009-10-16 02:05:46 -07:00
parent a67426faf8
commit 928ac69fcd
13 changed files with 209 additions and 73 deletions
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9
hotspot/src/share/vm/opto/graphKit.cpp
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@ -3186,6 +3186,15 @@ void GraphKit::write_barrier_post(Node* oop_store,
return;
}
if (use_ReduceInitialCardMarks()
&& obj == just_allocated_object(control())) {
// We can skip marks on a freshly-allocated object in Eden.
// Keep this code in sync with maybe_defer_card_mark() in runtime.cpp.
// That routine informs GC to take appropriate compensating steps
// so as to make this card-mark elision safe.
return;
}
if (!use_precise) {
// All card marks for a (non-array) instance are in one place:
adr = obj;