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

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Message-Id: <20110727131650.ad30a331.akpm@linux-foundation.org>
Date:	Wed, 27 Jul 2011 13:16:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Minchan Kim <minchan.kim@...il.com>
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 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 :(

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


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