linux-kernel - Re: [PATCH] mm: Avoid possible deadlock caused by too_many

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Message-ID: <4CC17CF1.4000109@redhat.com>
Date:	Fri, 22 Oct 2010 08:00:49 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Neil Brown <neilb@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [PATCH] mm: Avoid possible deadlock caused by too_many_isolated()

On 10/22/2010 12:55 AM, Wu Fengguang wrote:

> Now !GFP_IOFS reclaims won't be waiting for GFP_IOFS reclaims to
> progress. They will be blocked only when there are too many concurrent
> !GFP_IOFS reclaims, however that's very unlikely because the IO-less
> direct reclaims is able to progress much more faster, and they won't
> deadlock each other. The threshold is raised high enough for them, so
> that there can be sufficient parallel progress of !GFP_IOFS reclaims.
>
> CC: Torsten Kaiser<just.for.lkml@...glemail.com>
> CC: Minchan Kim<minchan.kim@...il.com>
> Tested-by: NeilBrown<neilb@...e.de>
> Acked-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wu Fengguang<fengguang.wu@...el.com>

Acked-by: Rik van Riel <riel@...hat.com>

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