linux-kernel - Re: [QUICKLIST 0/4] Arch independent quicklists V2

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Message-ID: <45F706BC.7060407@goop.org>
Date:	Tue, 13 Mar 2007 13:17:00 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Matt Mackall <mpm@...enic.com>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>, clameter@....com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2

Matt Mackall wrote:
> On Tue, Mar 13, 2007 at 10:30:10AM -0700, Jeremy Fitzhardinge wrote:
>   
>> Nick Piggin wrote:
>>     
>>> However we still have to visit those to-be-unmapped parts of the page
>>> table,
>>> to find the pages and free them. So we still at least need to bring it
>>> into
>>> cache for the read... at which point, the store probably isn't a big
>>> burden.
>>>       
>> Why not try to find a place to stash a linklist pointer and link them
>> all together?  Saves the pulldown pagetable walk altogether.
>>     
>
> Because we'd need one link per mm that a page is mapped in?
>   

Can pagetable pages be shared between mms?  (Kernel pmds in PAE excepted.)

    J
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