linux-kernel - Re: [PATCH] mm: forbid lumpy-reclaim in shrink_active

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Message-ID: <4F6793B0.50601@redhat.com>
Date:	Mon, 19 Mar 2012 16:14:40 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] mm: forbid lumpy-reclaim in shrink_active_list()

On 03/19/2012 04:05 PM, Hugh Dickins wrote:
> On Mon, 19 Mar 2012, Rik van Riel wrote:

>> It was done that way, because Mel explained to me that deactivating
>> a whole chunk of active pages at once is a desired feature that makes
>> it more likely that a whole contiguous chunk of pages will eventually
>> reach the end of the inactive list.
>
> I'm rather sceptical about this: is there a test which demonstrates
> a useful effect of that kind?

I am somewhat sceptical too, but since lumpy reclaim is
due to be removed anyway, I did not bother to investigate
its behaviour in any detail :)

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