xfs
[Top] [All Lists]

Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2

To: Mel Gorman <mgorman@xxxxxxx>
Subject: Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2
From: Minchan Kim <minchan.kim@xxxxxxxxx>
Date: Fri, 29 Jul 2011 18:48:16 +0900
Cc: Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, XFS <xfs@xxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Johannes Weiner <jweiner@xxxxxxxxxx>, Wu Fengguang <fengguang.wu@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; bh=5m7in/mLBeSv8yPniwgVgpyX/3y5VsCFAi2Q8Ms7Jo4=; b=uLu+IiYH2eIJ+IC6NAT0esnZ3jKBjTjl0H68LsGCOIrZj0Hm19E9QfMkqAgTQ39sfX F0F3DtTsapaknVBH6R6EvdzDFzaeZqLEBwKl2nDXb4WC++Y/+58SbPHblgGswvhpfhxI X8gyXQOTDyMIXIG39NYHWsIM5czp7V9C/YRis=
In-reply-to: <20110728113852.GN3010@xxxxxxx>
References: <1311265730-5324-1-git-send-email-mgorman@xxxxxxx> <20110727161821.GA1738@barrios-desktop> <20110728113852.GN3010@xxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Jul 28, 2011 at 12:38:52PM +0100, Mel Gorman wrote:
> On Thu, Jul 28, 2011 at 01:18:21AM +0900, Minchan Kim wrote:
> > On Thu, Jul 21, 2011 at 05:28:42PM +0100, Mel Gorman wrote:
> > > Note how preventing kswapd reclaiming dirty pages pushes up its CPU

<snip>

> > > usage as it scans more pages but it does not get excessive due to
> > > the throttling.
> > 
> > Good to hear.
> > The concern of this patchset was early OOM kill with too many scanning.
> > I can throw such concern out from now on.
> > 
> 
> At least, I haven't been able to trigger a premature OOM.

AFAIR, Andrew had a premature OOM problem[1] but I couldn't track down at that 
time.
I think this patch series might solve his problem. Although it doesn't, it 
should not accelerate
his problem, at least.

Andrew, Could you test this patchset?

[1] https://lkml.org/lkml/2011/5/25/415
-- 
Kind regards,
Minchan Kim

<Prev in Thread] Current Thread [Next in Thread>