linux-kernel - Re: [patch] drivers: wait for threaded probes between initcall levels

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Message-Id: <1162220757.2948.29.camel@laptopd505.fenrus.org>
Date:	Mon, 30 Oct 2006 16:05:57 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Xavier Bestel <xavier.bestel@...e.fr>
Cc:	Kyle Moffett <mrmacman_g4@....com>,
	Linus Torvalds <torvalds@...l.org>,
	"Adam J. Richter" <adam@...drasil.com>, akpm@...l.org,
	bunk@...sta.de, greg@...ah.com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, matthew@....cx, pavel@....cz,
	shemminger@...l.org
Subject: Re: [patch] drivers: wait for threaded probes between initcall
	levels

On Mon, 2006-10-30 at 16:00 +0100, Xavier Bestel wrote:
> On Mon, 2006-10-30 at 15:38 +0100, Arjan van de Ven wrote:
> 
> > how much of this complexity goes away if you consider the
> > scanning/probing as a series of "work elements", and you end up with a
> > queue of work elements that threads can pull work off one at a time (so
> > that if one element blocks the others just continue to flow). If you
> > then find, say, a new PCI bus you just put another work element to
> > process it at the end of the queue, or you process it synchronously. Etc
> > etc.
> > 
> > All you need to scale then is the number of worker threads on the
> > system, which should be relatively easy to size....
> > (check every X miliseconds if there are more than X outstanding work
> > elements, if there are, spawn one new worker thread if the total number
> > of worker threads is less than the system wide max. Worker threads die
> > if they have nothing to do for more than Y miliseconds)
> 
> Instead of checking every X ms, just check at each job insertion.

that would lead to a too eager amount of threads if processing the jobs
is really really quick ...


-- 
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