The patch titled
Subject: mm/vmstat.c: cache align vm_stat
has been added to the -mm tree. Its filename is
mm-vmstatc-cache-align-vm_stat.patch
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------------------------------------------------------
From: Dimitri Sivanich <sivanich@xxxxxxx>
Subject: mm/vmstat.c: cache align vm_stat
Avoid false sharing of the vm_stat array.
This was found to adversely affect tmpfs I/O performance.
Signed-off-by: Dimitri Sivanich <sivanich@xxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/vmstat.c~mm-vmstatc-cache-align-vm_stat mm/vmstat.c
--- a/mm/vmstat.c~mm-vmstatc-cache-align-vm_stat
+++ a/mm/vmstat.c
@@ -78,7 +78,7 @@ void vm_events_fold_cpu(int cpu)
*
* vm_stat contains the global counters
*/
-atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
+atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp;
EXPORT_SYMBOL(vm_stat);
#ifdef CONFIG_SMP
_
Subject: Subject: mm/vmstat.c: cache align vm_stat
Patches currently in -mm which might be from sivanich@xxxxxxx are
mm-vmstatc-cache-align-vm_stat.patch
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