--- old/src/hotspot/cpu/x86/globalDefinitions_x86.hpp	2019-08-28 15:03:28.058958498 -0400
+++ new/src/hotspot/cpu/x86/globalDefinitions_x86.hpp	2019-08-28 15:03:27.886958504 -0400
@@ -38,6 +38,7 @@
   #ifdef _LP64
     // tiered, 64-bit, large machine
     #define DEFAULT_CACHE_LINE_SIZE 128
+    #define OM_CACHE_LINE_SIZE 64
   #else
     // tiered, 32-bit, medium machine
     #define DEFAULT_CACHE_LINE_SIZE 64
@@ -50,6 +51,7 @@
   #ifdef _LP64
     // pure C2, 64-bit, large machine
     #define DEFAULT_CACHE_LINE_SIZE 128
+    #define OM_CACHE_LINE_SIZE 64
   #else
     // pure C2, 32-bit, medium machine
     #define DEFAULT_CACHE_LINE_SIZE 64