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diff src/share/vm/opto/graphKit.cpp @ 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 97125851f396
children 6deeaebad47a f516d5d7a019
line wrap: on
line diff
--- a/src/share/vm/opto/graphKit.cpp	Tue Jan 12 14:56:46 2010 -0800
+++ b/src/share/vm/opto/graphKit.cpp	Wed Jan 13 15:26:39 2010 -0800
@@ -3259,9 +3259,10 @@
   if (use_ReduceInitialCardMarks()
       && obj == just_allocated_object(control())) {
     // We can skip marks on a freshly-allocated object in Eden.
-    // Keep this code in sync with maybe_defer_card_mark() in runtime.cpp.
-    // That routine informs GC to take appropriate compensating steps
-    // so as to make this card-mark elision safe.
+    // Keep this code in sync with new_store_pre_barrier() in runtime.cpp.
+    // That routine informs GC to take appropriate compensating steps,
+    // upon a slow-path allocation, so as to make this card-mark
+    // elision safe.
     return;
   }