From: Dimitri Sivanich <sivanich@sgi.com>
Date: Tue, 1 Nov 2011 00:09:46 +0000 (-0700)
Subject: mm/vmstat.c: cache align vm_stat
X-Git-Tag: v3.0.39~35
X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=9116bc4fb2f96d4a3190932bf17088174da04401;p=unionfs-2.6.39.y.git

mm/vmstat.c: cache align vm_stat

commit a1cb2c60ddc98ff4e5246f410558805401ceee67 upstream.

Stable note: Not tracked on Bugzilla. This patch is known to make a big
        difference to tmpfs performance on larger machines.

This was found to adversely affect tmpfs I/O performance.

Tests run on a 640 cpu UV system.

With 120 threads doing parallel writes, each to different tmpfs mounts:
No patch:		~300 MB/sec
With vm_stat alignment:	~430 MB/sec

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 20c18b7694b..6559013c5a1 100644
--- a/mm/vmstat.c
+++ b/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