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Date: Fri, 28 Jun 2013 14:17:51 +0200
From: Michal Hocko <mhocko@suse.cz>
Subject: Re: [PATCH v2] vmpressure: consider "scanned < reclaimed" case when
 calculating  a pressure level.
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To: Anton Vorontsov <anton@enomsg.org>
Cc: Minchan Kim <minchan@kernel.org>, Hyunhee Kim <hyunhee.kim@samsung.com>, linux-mm@kvack.org, akpm@linux-foundation.org, rob@landley.net, kamezawa.hiroyu@jp.fujitsu.com, hannes@cmpxchg.org, rientjes@google.com, kirill@shutemov.name, 'Kyungmin Park' <kyungmin.park@samsung.com>

On Thu 27-06-13 11:05:50, Anton Vorontsov wrote:
> On Thu, Jun 27, 2013 at 06:11:03PM +0200, Michal Hocko wrote:
> > > If we send critical but there isn't big memory pressure, maybe
> > > critical handler would kill some process and the result is that
> > > killing another process unnecessary. That's really thing we should
> > > avoid.
> 
> Yes, so that is why I actually want to ack the patch... It might be not an
> ideal solution, but to me it seems like a good for the time being.

I am still not sure why a) nr_taken shouldn't be used instead of
nr_scanned b) why there should be any signal if the current allocator
dies and the direct reclaim is terminated prematurely.

[...]
-- 
Michal Hocko
SUSE Labs

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