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

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Message-ID: <20090506152100.41266e4c@lxorguk.ukuu.org.uk>
Date:	Wed, 6 May 2009 15:21:00 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Hugh Dickins <hugh@...itas.com>, Rik van Riel <riel@...hat.com>,
	Izik Eidus <ieidus@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, chrisw@...hat.com, device@...ana.org,
	linux-mm@...ck.org, nickpiggin@...oo.com.au
Subject: Re: [PATCH 2/6] ksm: dont allow overlap memory addresses
 registrations.

> the max number of ksm pages that can be allocated at any given time so
> to avoid OOM conditions, like the swap-compress logic that limits the
> swapdevice size to less than ram.

Are those pages accounted for in the vm_overcommit logic, as if you
allocate a big chunk of memory as KSM will do you need the worst case
vm_overcommit behaviour preserved and that means keeping the stats
correct.

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