linux-kernel - Re: [PATCH v4 00/10] Prevent LRU churning

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Message-ID: <20110729082313.GA1843@barrios-desktop>
Date:	Fri, 29 Jul 2011 17:23:13 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH v4 00/10] Prevent LRU churning

On Wed, Jul 27, 2011 at 01:16:50PM -0700, Andrew Morton wrote:
> On Mon,  4 Jul 2011 23:04:33 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
> 
> > Test result is following as.
> > 
> > 1) Elapased time 10GB file decompressed.
> > Old			inorder			inorder + pagevec flush[10/10]
> > 01:47:50.88		01:43:16.16		01:40:27.18
> > 
> > 2) failure of inorder lru
> > For test, it isolated 375756 pages. Only 45875 pages(12%) are put backed to
> > out-of-order(ie, head of LRU) Others, 329963 pages(88%) are put backed to in-order
> > (ie, position of old page in LRU).
> 
> I'm getting more and more worried about how complex MM is becoming and
> this patchset doesn't take us in a helpful direction :(

Hmm. I think it's not too complicated stuff. :(
But I understand your concern enoughly.

> 
> But it's hard to argue with numbers like that.  Please respin patches 6-10?

Of course, but it would be rather late due to my business and other interesting features.
I will try to get a new data point in next version.

Thanks, Andrew.

> 
> 

-- 
Kind regards,
Minchan Kim
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