[mmtom][BUGFIX] vmscan-second-chance-replacement-for-anonymous-pages-fix.patch

[mmtom][BUGFIX] vmscan-second-chance-replacement-for-anonymous-pages-fix.patch

[KAMEZAWA Hiroyuki]

Under memcg, active anon tend not to go to inactive anon.
This will cause OOM in memcg easily when tons of anon was used at once.
This check was lacked in split-lru.

This patch is a fix agaisnt
vmscan-second-chance-replacement-for-anonymous-pages.patch


Changelog: v1 -> v2:
 - avoid adding "else".

Signed-off-by:KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>

 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: mmtom-stamp-2008-07-15-15-39/mm/vmscan.c
===================================================================
--- mmtom-stamp-2008-07-15-15-39.orig/mm/vmscan.c
+++ mmtom-stamp-2008-07-15-15-39/mm/vmscan.c
@@ -1351,7 +1351,7 @@ static unsigned long shrink_zone(int pri
 	 * Even if we did not try to evict anon pages at all, we want to
 	 * rebalance the anon lru active/inactive ratio.
 	 */
-	if (scan_global_lru(sc) && inactive_anon_is_low(zone))
+	if (!scan_global_lru(sc) || inactive_anon_is_low(zone))
 		shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
 
 	throttle_vm_writeout(sc->gfp_mask);

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Re: [mmtom][BUGFIX] vmscan-second-chance-replacement-for-anonymous-pages-fix.patch

[Balbir Singh]

KAMEZAWA Hiroyuki wrote:
> Under memcg, active anon tend not to go to inactive anon.
> This will cause OOM in memcg easily when tons of anon was used at once.
> This check was lacked in split-lru.
> 
> This patch is a fix agaisnt
> vmscan-second-chance-replacement-for-anonymous-pages.patch
> 
> 
> Changelog: v1 -> v2:
>  - avoid adding "else".
> 
> Signed-off-by:KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Acked-by: Rik van Riel <riel@redhat.com>
> 
>  mm/vmscan.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: mmtom-stamp-2008-07-15-15-39/mm/vmscan.c
> ===================================================================
> --- mmtom-stamp-2008-07-15-15-39.orig/mm/vmscan.c
> +++ mmtom-stamp-2008-07-15-15-39/mm/vmscan.c
> @@ -1351,7 +1351,7 @@ static unsigned long shrink_zone(int pri
>  	 * Even if we did not try to evict anon pages at all, we want to
>  	 * rebalance the anon lru active/inactive ratio.
>  	 */
> -	if (scan_global_lru(sc) && inactive_anon_is_low(zone))
> +	if (!scan_global_lru(sc) || inactive_anon_is_low(zone))
>  		shrink_active_list(SWAP_CLUSTER_MAX, zone, sc, priority, 0);
> 
>  	throttle_vm_writeout(sc->gfp_mask);

I have not seen this, but looks good to me

Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

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