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diff src/share/vm/runtime/globals.hpp @ 1166:7b0e9cba0307

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6896647: card marks can be deferred too long Summary: 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
author ysr
date Wed, 13 Jan 2010 15:26:39 -0800
parents 504830073409
children 22e27cceb7d8
line wrap: on
line diff
--- a/src/share/vm/runtime/globals.hpp	Tue Jan 12 14:56:46 2010 -0800
+++ b/src/share/vm/runtime/globals.hpp	Wed Jan 13 15:26:39 2010 -0800
@@ -2015,6 +2015,10 @@
   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")                                      \
                                                                             \