Mercurial > hg > truffle

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 685e959d09ea
children 7c57aead6d3e
line wrap: on
line diff
--- a/src/share/vm/opto/graphKit.cpp	Wed Oct 07 19:01:55 2009 -0400
+++ b/src/share/vm/opto/graphKit.cpp	Fri Oct 16 02:05:46 2009 -0700
@@ -3186,6 +3186,15 @@
       return;
   }
 
+  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.
+    return;
+  }
+
   if (!use_precise) {
     // All card marks for a (non-array) instance are in one place:
     adr = obj;