linux-kernel - Re: ext3 IO latency measurements (was: Linux 2.6.29)

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Message-ID: <20090326205534.GA11217@srcf.ucam.org>
Date:	Thu, 26 Mar 2009 20:55:34 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29)

On Thu, Mar 26, 2009 at 08:42:09PM +0000, Alan Cox wrote:
> > before performing the update. So while relatime doesn't conform, the 
> > practical difference is meaningless. You can't depend on atime being 
> > updated in a timely manner.
> 
> POSIX says a disk write interrupted by a signal can be a short write. If
> you do this in practice all hell breaks loose.
> 
> A conforming implementation needs to conform with expectations not just
> play lawyer games with users systems.

I agree, but arguing for something on the basis of a spec isn't terribly 
convincing if the spec allows effectively identical behaviour. SuS isn't 
a relevant consideration when it comes to deciding default atime policy.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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