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6484982: G1: process references during evacuation pauses

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G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.

Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
This commit is contained in:
John Cuthbertson 2011-09-22 10:57:37 -07:00
parent 70bb8e788e
commit 1b62d10b4b
20 changed files with 1448 additions and 632 deletions
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6
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.cpp
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@ -234,6 +234,7 @@ void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) {
HeapRegion *startRegion = calculateStartRegion(worker_i);
ScanRSClosure scanRScl(oc, worker_i);
_g1->collection_set_iterate_from(startRegion, &scanRScl);
scanRScl.set_try_claimed();
_g1->collection_set_iterate_from(startRegion, &scanRScl);
@ -283,6 +284,7 @@ void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) {
double start = os::elapsedTime();
// Apply the given closure to all remaining log entries.
RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq);
_g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i);
// Now there should be no dirty cards.
@ -466,7 +468,7 @@ public:
MemRegion scanRegion(start, end);
UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set());
FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl);
FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl, NULL /* rp */);
FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl);
// We can pass false as the "filter_young" parameter here as:
@ -642,7 +644,7 @@ bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i,
update_rs_oop_cl.set_from(r);
TriggerClosure trigger_cl;
FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl);
FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl, NULL /* rp */);
InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl);
Mux2Closure mux(&invoke_cl, &update_rs_oop_cl);