# HG changeset patch
# User qpzhang
# Date 1592320518 -28800
#      Tue Jun 16 23:15:18 2020 +0800
# Node ID b0ffda66e0c2c3883794be01a3f73c7562836c3e
# Parent  01a72829dcffb87f676d81ddd937d7069e27b24b
8248214: Add paddings for TaskQueueSuper to reduce false-sharing cache contention
Summary: Add paddings for TaskQueueSuper to reduce false-sharing cache contention
Reviewed-by: robm

diff --git a/src/hotspot/share/gc/shared/taskqueue.hpp b/src/hotspot/share/gc/shared/taskqueue.hpp
--- a/src/hotspot/share/gc/shared/taskqueue.hpp
+++ b/src/hotspot/share/gc/shared/taskqueue.hpp
@@ -149,6 +149,8 @@
     };
   };
 
+  // Add paddings to reduce false-sharing cache contention between _bottom and _age
+  DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(_bottom));
   volatile Age _age;
 
   // These both operate mod N.