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8052172: Evacuation failure handling in G1 does not evacuate all objects if -XX:-G1DeferredRSUpdate is set

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Remove -XX:-G1DeferredRSUpdate functionality as it is racy. During evacuation failure handling, threads where evacuation failure handling occurred may try to add remembered sets to regions which remembered sets are currently being scanned. The iterator to handle the remembered set scan does not support addition of entries during scan and so may skip valid references.

Reviewed-by: iveresov, brutisso, mgerdin
This commit is contained in:
Thomas Schatzl 2014-09-16 10:28:15 +02:00
parent 3eff7a8f64
commit adf66602a0
10 changed files with 41 additions and 263 deletions
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14
hotspot/src/share/vm/gc_implementation/g1/g1ParScanThreadState.inline.hpp
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@ -29,20 +29,6 @@
#include "gc_implementation/g1/g1RemSet.inline.hpp"
#include "oops/oop.inline.hpp"
template <class T> inline void G1ParScanThreadState::immediate_rs_update(HeapRegion* from, T* p, int tid) {
if (!from->is_survivor()) {
_g1_rem->par_write_ref(from, p, tid);
}
}
template <class T> void G1ParScanThreadState::update_rs(HeapRegion* from, T* p, int tid) {
if (G1DeferredRSUpdate) {
deferred_rs_update(from, p, tid);
} else {
immediate_rs_update(from, p, tid);
}
}
template <class T> void G1ParScanThreadState::do_oop_evac(T* p, HeapRegion* from) {
assert(!oopDesc::is_null(oopDesc::load_decode_heap_oop(p)),
"Reference should not be NULL here as such are never pushed to the task queue.");