linux-kernel - Re: [PATCH] mm: memcg: remove checking reclaim order in soft limit reclaim

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Date:	Tue, 17 Jan 2012 15:07:12 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcg: remove checking reclaim order in soft limit
 reclaim

On Tue 17-01-12 21:29:52, Hillf Danton wrote:
> On Tue, Jan 17, 2012 at 9:16 PM, Michal Hocko <mhocko@...e.cz> wrote:
> > Hi,
> >
> > On Tue 17-01-12 20:47:59, Hillf Danton wrote:
> >> If async order-O reclaim expected here, it is settled down when setting up scan
> >> control, with scan priority hacked to be zero. Other than that, deny of reclaim
> >> should be removed.
> >
> > Maybe I have misunderstood you but this is not right. The check is to
> > protect from the _global_ reclaim with order > 0 when we prevent from
> > memcg soft reclaim.
> >
> need to bear mm hog in this way?

Could you be more specific? Are you trying to fix any particular
problem?

Global reclaim should take are of the global memory pressure. Soft
reclaim is intended just to make its job easier. Btw. softlimit reclaim
is on its way out of the kernel but this will not happen in 3.3.

> 
> Thanks
> Hillf
> 
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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