linux-kernel - Re: [PATCH 0/3] Unmapped page cache control (v5)

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Message-Id: <20110403183927.AE4D.A69D9226@jp.fujitsu.com>
Date:	Sun,  3 Apr 2011 18:39:12 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	akpm@...ux-foundation.org, npiggin@...nel.dk, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, cl@...ux.com,
	kamezawa.hiroyu@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH 0/3] Unmapped page cache control (v5)

> > > > Hm. OK, I may misread.
> > > > Can you please explain the reason why de-duplication feature need to selectable and
> > > > disabled by defaut. "explicity enable" mean this feature want to spot corner case issue??
> > > 
> > > Yes, because given a selection of choices (including what you
> > > mentioned in the review), it would be nice to have
> > > this selectable.
> > 
> > It's no good answer. :-/
> 
> I am afraid I cannot please you with my answers
> 
> > Who need the feature and who shouldn't use it? It this enough valuable for enough large
> > people? That's my question point.
> > 
> 
> You can see the use cases documented, including when running Linux as
> a guest under other hypervisors, 

Which hypervisor? If this patch is unrelated 99.9999% people, shouldn't you have to reduce
negative impact?


> today we have a choice of not using
> host page cache with cache=none, but nothing the other way round.
> There are other use cases for embedded folks (in terms of controlling
> unmapped page cache), please see previous discussions.

Is there other usecase? really? Where exist?
Why do you start to talk about embedded sudenly? I reviewed this as virtualization feature
beucase you wrote so in [path 0/3]. Why do you change your point suddenly?




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