linux-kernel - Re: [PATCH] mm: preallocate page before lock_page at filemap COW. (WasRe: [PATCH V2] mm: Do not keep page locked during page fault while charging it for memcg

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Date:	Thu, 26 Jan 2012 11:46:33 +0100
From:	Lutz Vieweg <lvml@....de>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] mm: preallocate page before lock_page at filemap COW.
 (WasRe: [PATCH V2] mm: Do not keep page locked during page fault while charging
 it for memcg

On 07/12/2011 11:48 AM, Michal Hocko wrote:
> Is there any intereset in discussing this or the email just got lost?
> Just for reference preallocation patch from Kamezawa is already in the
> Andrew's tree.

It's been a long time since this discussion, I just wanted to add
that I've been recently able to confirm the ability of memcg
to prevent single users from DOSing a system by "make -j" - in
a real-world scenario (using linux-3.2.1).

So thanks to all who contributed to the solution in whatever way :-)

(A minor issue remained: The kernel is very verbose when
killing tasks due to memcg restrictions. In fork-bomb like
scenarios, this can lead to high resource utilization for
syslog et al.)

Regards,

Lutz Vieweg

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