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

[Arjan van de Ven <arjan@infradead.org>]

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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