--- old/src/hotspot/cpu/x86/globalDefinitions_x86.hpp	2019-12-11 14:51:58.000000000 -0500
+++ new/src/hotspot/cpu/x86/globalDefinitions_x86.hpp	2019-12-11 14:51:58.000000000 -0500
@@ -40,6 +40,7 @@
   #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
@@ -52,6 +53,7 @@
   #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