diff -r f2110083203d -r a837fa3d3f86 src/share/vm/runtime/virtualspace.cpp
--- a/src/share/vm/runtime/virtualspace.cpp	Mon Jun 10 11:30:51 2013 +0200
+++ b/src/share/vm/runtime/virtualspace.cpp	Thu Jun 13 11:16:38 2013 -0700
@@ -533,11 +533,13 @@
            lower_high() + lower_needs <= lower_high_boundary(),
            "must not expand beyond region");
     if (!os::commit_memory(lower_high(), lower_needs, _executable)) {
-      debug_only(warning("os::commit_memory failed"));
+      debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT
+                         ", lower_needs=" SIZE_FORMAT ", %d) failed",
+                         lower_high(), lower_needs, _executable);)
       return false;
     } else {
       _lower_high += lower_needs;
-     }
+    }
   }
   if (middle_needs > 0) {
     assert(lower_high_boundary() <= middle_high() &&
@@ -545,7 +547,10 @@
            "must not expand beyond region");
     if (!os::commit_memory(middle_high(), middle_needs, middle_alignment(),
                            _executable)) {
-      debug_only(warning("os::commit_memory failed"));
+      debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT
+                         ", middle_needs=" SIZE_FORMAT ", " SIZE_FORMAT
+                         ", %d) failed", middle_high(), middle_needs,
+                         middle_alignment(), _executable);)
       return false;
     }
     _middle_high += middle_needs;
@@ -555,7 +560,9 @@
            upper_high() + upper_needs <= upper_high_boundary(),
            "must not expand beyond region");
     if (!os::commit_memory(upper_high(), upper_needs, _executable)) {
-      debug_only(warning("os::commit_memory failed"));
+      debug_only(warning("INFO: os::commit_memory(" PTR_FORMAT
+                         ", upper_needs=" SIZE_FORMAT ", %d) failed",
+                         upper_high(), upper_needs, _executable);)
       return false;
     } else {
       _upper_high += upper_needs;