--- a/hotspot/src/share/vm/runtime/perfMemory.cpp	Thu Nov 13 14:50:04 2008 -0800
+++ b/hotspot/src/share/vm/runtime/perfMemory.cpp	Tue Nov 18 12:31:53 2008 -0800
@@ -25,6 +25,14 @@
 # include "incls/_precompiled.incl"
 # include "incls/_perfMemory.cpp.incl"
 
+// Prefix of performance data file.
+const char               PERFDATA_NAME[] = "hsperfdata";
+
+// Add 1 for the '_' character between PERFDATA_NAME and pid. The '\0' terminating
+// character will be included in the sizeof(PERFDATA_NAME) operation.
+static const size_t PERFDATA_FILENAME_LEN = sizeof(PERFDATA_NAME) +
+                                            UINT_CHARS + 1;
+
 char*                    PerfMemory::_start = NULL;
 char*                    PerfMemory::_end = NULL;
 char*                    PerfMemory::_top = NULL;