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diff src/share/vm/runtime/arguments.cpp @ 237:1fdb98a17101

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6716785: implicit null checks not triggering with CompressedOops Summary: allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check Reviewed-by: kvn, jmasa, phh, jcoomes
author coleenp
date Sat, 19 Jul 2008 17:38:22 -0400
parents d1605aabd0a1
children b727c32788a9 d95b224e9f17 ef72a36b968e
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line diff
--- a/src/share/vm/runtime/arguments.cpp	Fri Jul 11 01:14:44 2008 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Sat Jul 19 17:38:22 2008 -0400
@@ -1176,9 +1176,7 @@
   // by ergonomics.
   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
-      // Leave compressed oops off by default. Uncomment
-      // the following line to return it to default status.
-      // FLAG_SET_ERGO(bool, UseCompressedOops, true);
+      FLAG_SET_ERGO(bool, UseCompressedOops, true);
     }
   } else {
     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {