linux-kernel - Re: [PATCH] vmscan: prevent background aging of anon page in no swap system

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Date:	Mon, 30 Aug 2010 22:30:49 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] vmscan: prevent background aging of anon page in no swap
 system

On 08/30/2010 09:23 PM, Minchan Kim wrote:

> Ying's one and mine both has a same effect.
> Only difference happens swap is full. My version maintains old
> behavior but Ying's one changes the behavior. I admit swap full is
> rare event but I hoped not changed old behavior if we doesn't find any
> problem.
> If kswapd does aging when swap full happens, is it a problem?

It may be a good thing, since swap will often be freed again
(when something is swapped in, or exits).

Having some more anonymous pages sit on the inactive list
gives them a chance to get used again, potentially giving
us a better chance of preserving the working set when swap
is full or near full a lot of the time.

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