Author: jimharris
Date: Wed Oct 31 17:12:12 2012
New Revision: 242401
URL: http://svn.freebsd.org/changeset/base/242401
Log:
Pad and align the callout_cpu mtx to its own cacheline to reduce false
sharing especially on the default CPU 0 callout_cpu structure.
This will be followed up by attilio@ with a conversion to the new struct
mtx_padalign but doing this manual conversion first gives an easy MFC
candidate since mtx_padalign is a more extensive system change.
Sponsored by: Intel
Reviewed by: jeff, attilio
MFC after: 1 week
Modified:
head/sys/kern/kern_timeout.c
Modified: head/sys/kern/kern_timeout.c
==============================================================================
--- head/sys/kern/kern_timeout.c Wed Oct 31 17:01:56 2012
(r242400)
+++ head/sys/kern/kern_timeout.c Wed Oct 31 17:12:12 2012
(r242401)
@@ -119,8 +119,8 @@ struct cc_mig_ent {
* when the callout should be served.
*/
struct callout_cpu {
- struct cc_mig_ent cc_migrating_entity;
struct mtx cc_lock;
+ struct cc_mig_ent cc_migrating_entity __aligned(CACHE_LINE_SIZE);
struct callout *cc_callout;
struct callout_tailq *cc_callwheel;
struct callout_list cc_callfree;
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