linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090326190337.GM27476@kernel.dk>
Date:	Thu, 26 Mar 2009 20:03:37 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Ric Wheeler <rwheeler@...hat.com>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Thu, Mar 26 2009, Hugh Dickins wrote:
> On Thu, 26 Mar 2009, Jens Axboe wrote:
> > On Thu, Mar 26 2009, Hugh Dickins wrote:
> > > 
> > > So, directing a barrier (WRITE_BARRIER or DISCARD_BARRIER) to a range
> > > of sectors in one partition interposes a barrier into the queue of I/O
> > > across (all partitions of) that whole device.
> > 
> > Correct
> > 
> > > I think that's not how filesystems really want barriers to behave,
> > > and might tend to discourage us from using barriers more freely.
> > > But I have zero appreciation of whether it's a significant issue
> > > worth non-trivial change - just wanted to get it out into the open.
> > 
> > Per-partition definitely makes sense. The problem is that we do sorting
> > on a per-device basis right now. But it's a good point, I'll try and
> > take a look at how much work it would be to make it per-partition
> > instead. It wont be trivial :-)
> 
> Thanks, that would be interesting.
> Trivial bores you anyway, doesn't it?

You're a good motivator, Hugh!

-- 
Jens Axboe

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