linux-kernel - Re: [PATCH 4/12] ksm: break cow once unshared

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Message-ID: <4A7709A0.4060402@redhat.com>
Date:	Mon, 03 Aug 2009 19:00:32 +0300
From:	Izik Eidus <ieidus@...hat.com>
To:	Hugh Dickins <hugh.dickins@...cali.co.uk>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Chris Wright <chrisw@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/12] ksm: break cow once unshared

Hugh Dickins wrote:
> We kept agreeing not to bother about the unswappable shared KSM pages
> which later become unshared by others: observation suggests they're not
> a significant proportion.  But they are disadvantageous, and it is easier
> to break COW to replace them by swappable pages, than offer statistics
> to show that they don't matter; then we can stop worrying about them.
>
> Doing this in ksm_do_scan, they don't go through cmp_and_merge_page on
> this pass: give them a good chance of getting into the unstable tree
> on the next pass, or back into the stable, by computing checksum now.
>
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> ---
ACK
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