linux-kernel - Re: [PATCH 3/3] Provide control over unmapped pages (v4)

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Message-ID: <20110128111833.GD5054@balbir.in.ibm.com>
Date:	Fri, 28 Jan 2011 16:48:33 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, npiggin@...nel.dk,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com, cl@...ux.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 3/3] Provide control over unmapped pages (v4)

* MinChan Kim <minchan.kim@...il.com> [2011-01-28 16:24:19]:

> >
> > But the assumption for LRU order to change happens only if the page
> > cannot be successfully freed, which means it is in some way active..
> > and needs to be moved no?
> 
> 1. holded page by someone
> 2. mapped pages
> 3. active pages
> 
> 1 is rare so it isn't the problem.
> Of course, in case of 3, we have to activate it so no problem.
> The problem is 2.
>

2 is a problem, but due to the size aspects not a big one. Like you
said even lumpy reclaim affects it. May be the reclaim code could
honour may_unmap much earlier. 

-- 
	Three Cheers,
	Balbir
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