linux-kernel - Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.

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Message-ID: <4A015C69.7010600@redhat.com>
Date:	Wed, 06 May 2009 12:46:17 +0300
From:	Izik Eidus <ieidus@...hat.com>
To:	Rik van Riel <riel@...hat.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	aarcange@...hat.com, chrisw@...hat.com, alan@...rguk.ukuu.org.uk,
	device@...ana.org, linux-mm@...ck.org, hugh@...itas.com,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.

Rik van Riel wrote:
> Izik Eidus wrote:
>> subjects say it all.
>
> Not a very useful commit message.
>
> This makes me wonder, though.
>
> What happens if a user mmaps a 30MB memory region, registers it
> with KSM and then unmaps the middle 10MB?

User cant break 30MB into smaller one.
That mean that when you regisiter memory region that is X mb size, you 
can only remove it (as a whole), or add new region.
This should answer the next question you had about why i have just the 
start address for removing the regions.

>
>> Signed-off-by: Izik Eidus <ieidus@...hat.com>
>
> except for the commit message, Acked-by: Rik van Riel <riel@...hat.com>
>

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