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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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4
hotspot/src/share/vm/runtime/globals.hpp
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@ -2015,6 +2015,10 @@ class CommandLineFlags {
diagnostic(bool, GCParallelVerificationEnabled, true, \
"Enable parallel memory system verification") \
\
diagnostic(bool, DeferInitialCardMark, false, \
"When +ReduceInitialCardMarks, explicitly defer any that " \
"may arise from new_pre_store_barrier") \
\
diagnostic(bool, VerifyRememberedSets, false, \
"Verify GC remembered sets") \
\