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From: Kip Macy <kmacy@FreeBSD.org>
Date: Thu, 25 Jun 2009 22:24:14 +0000 (UTC)
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Subject: svn commit: r195010 - user/kmacy/releng_7_2_fcs/sys/amd64/amd64
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Author: kmacy
Date: Thu Jun 25 22:24:13 2009
New Revision: 195010
URL: http://svn.freebsd.org/changeset/base/195010

Log:
  guarantee absence of false sharing on pv_lock and page locks

Modified:
  user/kmacy/releng_7_2_fcs/sys/amd64/amd64/pmap.c

Modified: user/kmacy/releng_7_2_fcs/sys/amd64/amd64/pmap.c
==============================================================================
--- user/kmacy/releng_7_2_fcs/sys/amd64/amd64/pmap.c	Thu Jun 25 22:22:03 2009	(r195009)
+++ user/kmacy/releng_7_2_fcs/sys/amd64/amd64/pmap.c	Thu Jun 25 22:24:13 2009	(r195010)
@@ -184,8 +184,9 @@ struct vp_lock {
 
 #define	PA_LOCK_COUNT	64
 
-struct vp_lock pa_lock[PA_LOCK_COUNT];
-struct mtx pv_lock;
+struct mtx pv_lock __aligned(128);
+struct vp_lock pa_lock[PA_LOCK_COUNT] __aligned(128);
+
 
 struct pmap kernel_pmap_store;