On Tue, 21 Sep 2004, Oliver Neukum wrote:

> Tree transversals could be kept happy with a rwsem.
> The rest is really rare. And where it is not rare, I am not convinced
> that uncontrolled paralellism is a good idea. IMHO you would soon
> block on higher order allocations for hotplug anyway. Maybe you'd
> even need rate limiting for hotplug outcalls.
> I am suspecting overengineering here.

Maybe uncontrolled parallelism is bad, but no parallelism at all may be
worse.  For desktop users the difference might not be particularly
noticeable.  But I can just imagine the screams on LKML when people using
Linux on mainframes like the IBM S/390 discover that dozens or hundreds of
attached devices have to be discovered and probed one at a time.

Alan Stern



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