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6896647: card marks can be deferred too long

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Deferred card marks are now flushed during the gc prologue. Parallel[Scavege,OldGC] and SerialGC no longer defer card marks generated by COMPILER2 as a result of ReduceInitialCardMarks. For these cases, introduced a diagnostic option to defer the card marks, only for the purposes of testing and diagnostics. CMS and G1 continue to defer card marks. Potential performance concern related to single-threaded flushing of deferred card marks in the gc prologue will be addressed in the future.

Reviewed-by: never, johnc
This commit is contained in:
Y. Srinivas Ramakrishna 2010-01-13 15:26:39 -08:00
parent 0917ad432e
commit 331512606a
14 changed files with 107 additions and 54 deletions
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hotspot/src/share/vm/runtime/vmStructs.cpp
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@ -309,6 +309,7 @@ static inline uint64_t cast_uint64_t(size_t x)
nonstatic_field(CollectedHeap, _reserved, MemRegion) \
nonstatic_field(SharedHeap, _perm_gen, PermGen*) \
nonstatic_field(CollectedHeap, _barrier_set, BarrierSet*) \
nonstatic_field(CollectedHeap, _defer_initial_card_mark, bool) \
nonstatic_field(CollectedHeap, _is_gc_active, bool) \
nonstatic_field(CompactibleSpace, _compaction_top, HeapWord*) \
nonstatic_field(CompactibleSpace, _first_dead, HeapWord*) \