linux-kernel - Re: [PATCH 06/10] ksm: identify PageKsm pages

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Message-ID: <Pine.LNX.4.64.0907231236370.12896@sister.anvils>
Date:	Thu, 23 Jul 2009 12:43:25 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <ieidus@...hat.com>, akpm@...ux-foundation.org,
	chrisw@...hat.com, avi@...hat.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, nickpiggin@...oo.com.au,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 06/10] ksm: identify PageKsm pages

On Thu, 23 Jul 2009, KAMEZAWA Hiroyuki wrote:
> On Wed, 22 Jul 2009 13:54:06 +0100 (BST)
> Hugh Dickins <hugh.dickins@...cali.co.uk> wrote:
> > 
> > (At this instant I've forgotten why there's an unevictable list at
> > all - somewhere in vmscan.c which is accustomed to dealing with
> > pages on lists, so easier to have them on a list than not?)
> > 
> I forget, too. But in short thinking, Unevictable pages should be
> on LRU (marked as PG_lru) for isolating page (from LRU) called by
> page migration etc.
> 
> isolate_lru_page()
> 	-> put page on private list
> 	-> do some work
> 	-> putback_lru_page()
> 
> sequence is useful at handling pages in a list.
> Because mlock/munclock can be called arbitrarily, unevicatable lru
> works enough good for making above kinds of code simpler.

Yes, I think that's it, thanks.

And for the moment, the KSM pages are therefore unmigratable
as well as unswappable; but that should change in 2.6.33.

Hugh
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