In-Reply-To: <20060124160427.1ed68461.diegocg@gmail.com>
To: Diego Calleja <diegocg@gmail.com>
Cc: a1426z@gawab.com, barryn@pobox.com, linux-fsdevel@vger.kernel.org,
       linux-kernel@vger.kernel.org, mloftis@wgops.com, nikita@clusterfs.com,
       Ram Gupta <ram.gupta5@gmail.com>
MIME-Version: 1.0
Subject: Re: [RFC] VM: I have a dream...
Message-ID: <OFB608064A.42CC9F1C-ON88257100.0072D92E-88257100.007356F8@us.ibm.com>
From: Bryan Henderson <hbryan@us.ibm.com>
Date: Tue, 24 Jan 2006 12:59:48 -0800
Content-Type: text/plain; charset="US-ASCII"
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 973
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>Linux is the one desktop lacking something like this, both windows
>and max os x have things like this. I've wondered for long time if
>it's worth of it and if it could improve things in linux. The
>prefault part is easy once you get the data. The hard part is to get
>the statistics:

If you focus on the system startup speed problem, the stats are quite a 
bit simpler.  If you can take a snapshot of every mmap page in memory 
shortly after startup (and verify that no page frames were stolen during 
startup) and save that, you could just prefault all those pages in, in a 
single sweep, at the next boot.

--
Bryan Henderson                     IBM Almaden Research Center
San Jose CA                         Filesystems


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