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

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Message-ID: <CAObL_7Fnc820gFvFxZa3iHUzkKaZaMy9o7LAN7z8mk8_zUxkrQ@mail.gmail.com>
Date:	Fri, 29 Jul 2011 09:41:59 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Mel Gorman <mgorman@...e.de>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>, XFS <xfs@....sgi.com>,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	Johannes Weiner <jweiner@...hat.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2

On Fri, Jul 29, 2011 at 5:50 AM, Minchan Kim <minchan.kim@...il.com> wrote:
> Sorry for missing Ccing.
>
> On Fri, Jul 29, 2011 at 06:48:16PM +0900, Minchan Kim wrote:
>> 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?

Gladly, but not until Wednesday most likely.  I'm defending my thesis
on Monday :)

--Andy
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