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diff src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 6610:f99a36499b8c

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7192128: G1: Extend fix for 6948537 to G1's BOT Summary: G1 does not appear to be immune to the issue described in CR 6948537 and increasing the size of old-generation PLABs appears to increase the liklihood of seeing the issue. Extend the fix for 6948537 to G1's BlockOffsetTable. Reviewed-by: brutisso, jmasa
author johnc
date Tue, 21 Aug 2012 10:05:57 -0700
parents aaf61e68b255
children 7383557659bd
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line diff
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Fri Aug 17 15:41:04 2012 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Tue Aug 21 10:05:57 2012 -0700
@@ -1934,6 +1934,14 @@
   clear_cset_start_regions();
 
   guarantee(_task_queues != NULL, "task_queues allocation failure.");
+#ifdef SPARC
+  // Issue a stern warning, but allow use for experimentation and debugging.
+  if (VM_Version::is_sun4v() && UseMemSetInBOT) {
+    assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
+    warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
+            " on sun4v; please understand that you are using at your own risk!");
+  }
+#endif
 }
 
 jint G1CollectedHeap::initialize() {