From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Greg KH <gregkh@linuxfoundation.org>,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
alan@lxorguk.ukuu.org.uk, Dimitri Sivanich <sivanich@sgi.com>,
Christoph Lameter <cl@gentwo.org>, Mel Gorman <mel@csn.ul.ie>,
Mel Gorman <mgorman@suse.de>
Subject: [ 07/41] mm/vmstat.c: cache align vm_stat
Date: Mon, 30 Jul 2012 10:31:06 -0700 [thread overview]
Message-ID: <20120730172901.882088274@linuxfoundation.org> (raw)
In-Reply-To: <20120730172901.306897424@linuxfoundation.org>
From: Greg KH <gregkh@linuxfoundation.org>
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dimitri Sivanich <sivanich@sgi.com>
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>
---
mm/vmstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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
next prev parent reply other threads:[~2012-07-30 17:32 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-30 17:30 [ 00/41] 3.0.39-rc2 stable review Greg Kroah-Hartman
2012-07-30 17:31 ` [ 01/41] cifs: always update the inode cache with the results from a FIND_* Greg Kroah-Hartman
2012-07-30 17:31 ` [ 02/41] ntp: Fix STA_INS/DEL clearing bug Greg Kroah-Hartman
2012-07-30 17:31 ` [ 03/41] mm: fix lost kswapd wakeup in kswapd_stop() Greg Kroah-Hartman
2012-07-30 17:31 ` [ 04/41] MIPS: Properly align the .data..init_task section Greg Kroah-Hartman
2012-07-30 17:31 ` [ 05/41] UBIFS: fix a bug in empty space fix-up Greg Kroah-Hartman
2012-07-30 17:31 ` [ 06/41] dm raid1: fix crash with mirror recovery and discard Greg Kroah-Hartman
2012-07-30 17:31 ` Greg Kroah-Hartman [this message]
2012-07-30 17:31 ` [ 08/41] mm: memory hotplug: Check if pages are correctly reserved on a per-section basis Greg Kroah-Hartman
2012-07-30 17:31 ` [ 09/41] mm: reduce the amount of work done when updating min_free_kbytes Greg Kroah-Hartman
2012-07-30 17:31 ` [ 10/41] mm: vmscan: fix force-scanning small targets without swap Greg Kroah-Hartman
2012-07-30 17:31 ` [ 11/41] vmscan: clear ZONE_CONGESTED for zone with good watermark Greg Kroah-Hartman
2012-07-30 17:31 ` [ 12/41] vmscan: add shrink_slab tracepoints Greg Kroah-Hartman
2012-07-30 17:31 ` [ 13/41] vmscan: shrinker->nr updates race and go wrong Greg Kroah-Hartman
2012-07-30 17:31 ` [ 14/41] vmscan: reduce wind up shrinker->nr when shrinker cant do work Greg Kroah-Hartman
2012-07-30 17:31 ` [ 15/41] vmscan: limit direct reclaim for higher order allocations Greg Kroah-Hartman
2012-07-30 17:31 ` [ 16/41] vmscan: abort reclaim/compaction if compaction can proceed Greg Kroah-Hartman
2012-07-30 17:31 ` [ 17/41] mm: compaction: trivial clean up in acct_isolated() Greg Kroah-Hartman
2012-07-30 17:31 ` [ 18/41] mm: change isolate mode from #define to bitwise type Greg Kroah-Hartman
2012-07-30 17:31 ` [ 19/41] mm: compaction: make isolate_lru_page() filter-aware Greg Kroah-Hartman
2012-07-30 17:31 ` [ 20/41] mm: zone_reclaim: " Greg Kroah-Hartman
2012-07-30 17:31 ` [ 21/41] mm: migration: clean up unmap_and_move() Greg Kroah-Hartman
2012-07-30 17:31 ` [ 22/41] mm: compaction: allow compaction to isolate dirty pages Greg Kroah-Hartman
2012-07-30 17:31 ` [ 23/41] mm: compaction: determine if dirty pages can be migrated without blocking within ->migratepage Greg Kroah-Hartman
2012-07-30 17:31 ` [ 24/41] mm: page allocator: do not call direct reclaim for THP allocations while compaction is deferred Greg Kroah-Hartman
2012-07-30 17:31 ` [ 25/41] mm: compaction: make isolate_lru_page() filter-aware again Greg Kroah-Hartman
2012-07-30 17:31 ` [ 26/41] kswapd: avoid unnecessary rebalance after an unsuccessful balancing Greg Kroah-Hartman
2012-07-30 17:31 ` [ 27/41] kswapd: assign new_order and new_classzone_idx after wakeup in sleeping Greg Kroah-Hartman
2012-07-30 17:31 ` [ 28/41] mm: compaction: introduce sync-light migration for use by compaction Greg Kroah-Hartman
2012-07-31 16:43 ` Herton Ronaldo Krzesinski
2012-07-31 17:00 ` Greg Kroah-Hartman
2012-07-30 17:31 ` [ 29/41] mm: vmscan: when reclaiming for compaction, ensure there are sufficient free pages available Greg Kroah-Hartman
2012-07-30 17:31 ` [ 30/41] mm: vmscan: do not OOM if aborting reclaim to start compaction Greg Kroah-Hartman
2012-07-30 17:31 ` [ 31/41] mm: vmscan: check if reclaim should really abort even if compaction_ready() is true for one zone Greg Kroah-Hartman
2012-07-30 17:31 ` [ 32/41] vmscan: promote shared file mapped pages Greg Kroah-Hartman
2012-07-30 17:31 ` [ 33/41] vmscan: activate executable pages after first usage Greg Kroah-Hartman
2012-07-30 17:31 ` [ 34/41] mm/vmscan.c: consider swap space when deciding whether to continue reclaim Greg Kroah-Hartman
2012-07-30 17:31 ` [ 35/41] mm: test PageSwapBacked in lumpy reclaim Greg Kroah-Hartman
2012-07-30 17:31 ` [ 36/41] mm: vmscan: convert global reclaim to per-memcg LRU lists Greg Kroah-Hartman
2012-07-30 17:31 ` [ 37/41] cpusets: avoid looping when storing to mems_allowed if one node remains set Greg Kroah-Hartman
2012-07-30 17:31 ` [ 38/41] cpusets: stall when updating mems_allowed for mempolicy or disjoint nodemask Greg Kroah-Hartman
2012-07-30 17:31 ` [ 39/41] cpuset: mm: reduce large amounts of memory barrier related damage v3 Greg Kroah-Hartman
2012-07-30 17:31 ` [ 40/41] mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma Greg Kroah-Hartman
2012-07-30 17:31 ` [ 41/41] vmscan: fix initial shrinker size handling Greg Kroah-Hartman
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