linux-ext4 - Re: partially uptodate page reads

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Message-Id: <200807251922.40299.nickpiggin@yahoo.com.au>
Date:	Fri, 25 Jul 2008 19:22:39 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	hifumi.hisashi@....ntt.co.jp, jack@....cz,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, xfs@....sgi.com
Subject: Re: partially uptodate page reads

On Friday 25 July 2008 03:59, Christoph Hellwig wrote:
> On Fri, Jul 25, 2008 at 01:17:11AM +1000, Nick Piggin wrote:
> > Hi, I have some questions about your patch in -mm
> >
> > vfs-pagecache-usage-optimization-onpagesize=blocksize-environment.patch
> >
> > I have no particular problem with something like this, but leaving the
> > implementation details aside for the moment, can we discuss the
> > justification for this?
> >
> > Are there significant numbers of people using block size < page size in
> > situations where performance is important and significantly improved by
> > this patch? Can you give any performance numbers to illustrate perhaps?
>
> With XFS lots of people use 4k blocksize filesystems on ia64 systems
> with 16k pages, so an optimization like this would be useful.
>
> But as mentioned in one of your previous comments I'd rather prefer
> a readpage interface chaneg to deal with this.

Yeah... actually if it is a nice win I don't mind too much to go
with this API to start with, and consolidate with readpage later.
Readpage I am thinking about making a few other changes for it as
well, so I am happy to look at folding in this partially-uptodate
API with it as well.

If we just get some numbers (maybe SGI can help out?), I'm happy
enough with this approach.
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