linux-kernel - Re: [PATCH 3/6] ksm: change the KSM_REMOVE_MEMORY

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Message-ID: <4A00DF9B.1080501@redhat.com>
Date:	Tue, 05 May 2009 20:53:47 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Izik Eidus <ieidus@...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 3/6] ksm: change the KSM_REMOVE_MEMORY_REGION ioctl.

Izik Eidus wrote:
> This patch change the KSM_REMOVE_MEMORY_REGION ioctl to be specific per
> memory region (instead of flushing all the registred memory regions inside
> the file descriptor like it happen now)
> 
> The previoes api was:
> user register memory regions using KSM_REGISTER_MEMORY_REGION inside the fd,
> and then when he wanted to remove just one memory region, he had to remove them
> all using KSM_REMOVE_MEMORY_REGION.
> 
> This patch change this beahivor by chaning the KSM_REMOVE_MEMORY_REGION
> ioctl to recive another paramter that it is the begining of the virtual
> address that is wanted to be removed.

This is different from munmap and madvise, which take both
start address and length.

Why?

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