netdev - Re: [1/1] Block device throttling [Re: Distributed storage.]

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Message-Id: <200709012142.55534.phillips@phunq.net>
Date:	Sat, 1 Sep 2007 21:42:53 -0700
From:	Daniel Phillips <phillips@...nq.net>
To:	Alasdair G Kergon <agk@...hat.com>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Jens Axboe <jens.axboe@...cle.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [1/1] Block device throttling [Re: Distributed storage.]

On Friday 31 August 2007 14:41, Alasdair G Kergon wrote:
> On Thu, Aug 30, 2007 at 04:20:35PM -0700, Daniel Phillips wrote:
> > Resubmitting a bio or submitting a dependent bio from
> > inside a block driver does not need to be throttled because all
> > resources required to guarantee completion must have been obtained
> > _before_ the bio was allowed to proceed into the block layer.
>
> I'm toying with the idea of keeping track of the maximum device stack
> depth for each stacked device, and only permitting it to increase in
> controlled circumstances.

Hi Alasdair,

What kind of circumstances did you have in mind?

Regards,

Daniel
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