linux-kernel - Re: [RFC] Tracking mlocked pages and moving them off the LRU

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Message-ID: <Pine.LNX.4.64.0702050931430.26272@schroedinger.engr.sgi.com>
Date:	Mon, 5 Feb 2007 09:33:20 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [RFC] Tracking mlocked pages and moving them off the LRU

On Mon, 5 Feb 2007, Arjan van de Ven wrote:

> > I still need a solution for the problem of not having enough page flag 
> > bits on i386 NUMA.
> 
> I still don't get why you *really* need such a bit. 

Because otherwise you cannot establish why a page was removed from the 
LRU. If a page is off the LRU for other reasons then one should not 
return the page to the LRU in zap_pte_range. How can this determination 
be made without a page flag?

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