linux-kernel - Re: PATCH] fix potential latency issues in JBD's journal code

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Message-ID: <20080706122058.GA26084@mit.edu>
Date:	Sun, 6 Jul 2008 08:20:58 -0400
From:	Theodore Tso <tytso@....EDU>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	linux-kernel@...r.kernel.org
Subject: Re: PATCH] fix potential latency issues in JBD's journal code

On Sat, Jul 05, 2008 at 10:30:21PM -0700, Arjan van de Ven wrote:
> it's debatable. Because this submit-bh() will sometimes block... it
> wouldn't get IO started for that case. I think this is where I'd like
> Jens to say what he thinks the rules are; clearly the elevator needs to
> treat all of these guys as sync, but maybe the plugging should be ..
> flexible.

Stupid idea.... maybe the unplugging should be done on the wait side?
Has this been considered already?

						- Ted
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