Re: Root-causing kswapd spinning on Sandy Bridge laptops?

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On Fri, Jun 24, 2011 at 11:24:24AM +0100, P?draig Brady wrote:
> On 24/06/11 10:27, Minchan Kim wrote:
> > Hi Andrew,
> > 
> > Sorry but right now I don't have a time to dive into this.
> > But it seems to be similar to the problem Mel is looking at.
> > Cced him.
> > 
> > Even, Pádraig Brady seem to have a reproducible scenario.
> > I will look when I have a time.
> > I hope I will be back sooner or later.
> 
> My reproducer is (I've 3GB RAM, 1.5G swap):
>   dd bs=1M count=3000 if=/dev/zero of=spin.test
> 
> To stop it spinning I just have to uncache the data,
> the handiest way being:
>   rm spin.test
> 
> To confirm, the top of the profile I posted is:
>   i915_gem_object_bind_to_gtt
>     shrink_slab
> 

I don't think it's an i915 bug. Another candidate fix in the other
thread that Padraig started.

-- 
Mel Gorman
SUSE Labs

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