linux-kernel - Re: [PATCH 4/4] add ksm kernel shared memory driver.

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Message-ID: <20090331151845.GT9137@random.random>
Date:	Tue, 31 Mar 2009 17:18:45 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	Izik Eidus <ieidus@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org, avi@...hat.com,
	chrisw@...hat.com, riel@...hat.com, jeremy@...p.org,
	mtosatti@...hat.com, hugh@...itas.com, corbet@....net,
	yaniv@...hat.com, dmonakhov@...nvz.org
Subject: Re: [PATCH 4/4] add ksm kernel shared memory driver.

On Tue, Mar 31, 2009 at 10:09:24AM -0500, Anthony Liguori wrote:
> I don't think the registering of ram should be done via sysfs.  That would 
> be a pretty bad interface IMHO.  But I do think the functionality that 
> ksmctl provides along with the security issues I mentioned earlier really 
> suggest that there ought to be a separate API for control vs. registration 
> and that control API would make a lot of sense as a sysfs API.
>
> If you wanted to explore alternative APIs for registration, madvise() seems 
> like the obvious candidate to me.
>
> madvise(start, size, MADV_SHARABLE) seems like a pretty obvious API to me.

madvise to me would sound appropriate, only if ksm would be always-in,
which is not the case as it won't even be built if it's configured to
N.

Besides madvise is sus covered syscall, and this is linux specific detail.
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