linux-kernel - Re: Block device throttling [Re: Distributed storage.]

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Message-Id: <200708140435.44979.phillips@phunq.net>
Date:	Tue, 14 Aug 2007 04:35:43 -0700
From:	Daniel Phillips <phillips@...nq.net>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	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>
Subject: Re: Block device throttling [Re: Distributed storage.]

On Tuesday 14 August 2007 04:30, Evgeniy Polyakov wrote:
> > And it will not solve the deadlock problem in general.  (Maybe it
> > works for your virtual device, but I wonder...)  If the virtual
> > device allocates memory during generic_make_request then the memory
> > needs to be throttled.
>
> Daniel, if device process bio by itself, it has a limit and thus it
> will wait in generic_make_request()

What will make it wait?

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