linux-kernel - Re: [PATCH 2/9] ksm: let shared pages be swappable

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Message-ID: <20091201063201.GD14368@x200.localdomain>
Date:	Mon, 30 Nov 2009 22:32:01 -0800
From:	Chris Wright <chrisw@...hat.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>,
	Chris Wright <chrisw@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH 2/9] ksm: let shared pages be swappable

* KAMEZAWA Hiroyuki (kamezawa.hiroyu@...fujitsu.com) wrote:
> Hmm. Can KSM coalesce 10000+ of pages to a page ?

Yes.  The zero page is a prime example of this.

> In such case, lru
> need to scan 10000+ ptes with 10000+ anon_vma->lock and 10000+ pte locks
> for reclaiming a page.

Would likely be a poor choice too.  With so many references it's likely
to be touched soon and swapped right back in.

thanks,
-chris
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