Re: [PATCH 1/5] page allocator: Always wake kswapd when restartingan allocation attempt after direct reclaim failed

[Mel Gorman]

On Fri, Nov 13, 2009 at 02:23:21PM +0900, KOSAKI Motohiro wrote:
> > If a direct reclaim makes no forward progress, it considers whether it
> > should go OOM or not. Whether OOM is triggered or not, it may retry the
> > application afterwards. In times past, this would always wake kswapd as well
> > but currently, kswapd is not woken up after direct reclaim fails. For order-0
> > allocations, this makes little difference but if there is a heavy mix of
> > higher-order allocations that direct reclaim is failing for, it might mean
> > that kswapd is not rewoken for higher orders as much as it did previously.
> > 
> > This patch wakes up kswapd when an allocation is being retried after a direct
> > reclaim failure. It would be expected that kswapd is already awake, but
> > this has the effect of telling kswapd to reclaim at the higher order as well.
> > 
> > Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
> > Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
> > Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> 
> Umm,
> My mail box have the carbon copy of akpm sent this patch to linus.
> (bellow subject and data)
> 
> Does this have any update?
> 

No, it doesn't. I included it in the series for the benefit of testers.

> -----------------------------------------------------------------
> Subject: [patch 07/35] page allocator: always wake kswapd when restarting an allocation attempt after direct reclaim failed
> To: torvalds@xxxxxxxxxxxxxxxxxxxx
> Cc: akpm@xxxxxxxxxxxxxxxxxxxx,
>  mel@xxxxxxxxx,
>  cl@xxxxxxxxxxxxxxxxxxxx,
>  kosaki.motohiro@xxxxxxxxxxxxxx,
>  penberg@xxxxxxxxxxxxxx,
>  stable@xxxxxxxxxx
> From: akpm@xxxxxxxxxxxxxxxxxxxx
> Date: Wed, 11 Nov 2009 14:26:14 -0800
> 
> 
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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