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diff src/share/vm/opto/library_call.cpp @ 1027:39b01ab7035a

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6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning 6889757: G1: enable card mark elision for initializing writes from compiled code (ReduceInitialCardMarks) Summary: Defer the (compiler-elided) card-mark upon a slow-path allocation until after the store and before the next subsequent safepoint; G1 now answers yes to can_elide_tlab_write_barriers(). Reviewed-by: jcoomes, kvn, never
author ysr
date Fri, 16 Oct 2009 02:05:46 -0700
parents 62001a362ce9
children cd37471eaecc
line wrap: on
line diff
--- a/src/share/vm/opto/library_call.cpp	Wed Oct 07 19:01:55 2009 -0400
+++ b/src/share/vm/opto/library_call.cpp	Fri Oct 16 02:05:46 2009 -0700
@@ -4160,13 +4160,13 @@
           result_mem ->set_req(_objArray_path, reset_memory());
         }
       }
-      // We can dispense with card marks if we know the allocation
-      // comes out of eden (TLAB)...  In fact, ReduceInitialCardMarks
-      // causes the non-eden paths to simulate a fresh allocation,
-      // insofar that no further card marks are required to initialize
-      // the object.
-
       // Otherwise, there are no card marks to worry about.
+      // (We can dispense with card marks if we know the allocation
+      //  comes out of eden (TLAB)...  In fact, ReduceInitialCardMarks
+      //  causes the non-eden paths to take compensating steps to
+      //  simulate a fresh allocation, so that no further
+      //  card marks are required in compiled code to initialize
+      //  the object.)
 
       if (!stopped()) {
         copy_to_clone(obj, alloc_obj, obj_size, true, false);