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

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Message-ID: <CAJd=RBBcL5RuW1wC_Yh=gy2Ja8wqJ6jhf28zNi1n6MJ=+0=m2Q@mail.gmail.com>
Date:	Tue, 17 Jan 2012 21:29:52 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
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, 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?

Thanks
Hillf
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