Re: [PATCH] The Ubuntu Collection: Winter/Spring 2006

[Scott James Remnant <scott@ubuntu.com>]

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On Fri, 2006-02-10 at 01:30 +0000, Scott James Remnant wrote:

> On Thu, 2006-02-09 at 23:52 +0100, Marco d'Itri wrote:
> 
> > On Feb 09, Scott James Remnant <scott@ubuntu.com> wrote:
> > 
> > >     The theory is that another udev process will do the opposite, and
> > >     both renames will succeed.
> > Did you consider the case of a system with a dozen of interfaces, the
> > exaustion of available udevd child processes and the possible deadlock?
> > 
> They'll die off eventually under the three minute rule; if systems with
> dozens of interfaces are really doing this kind of renaming frenzy,
> they're probably doomed anyway :-)
> 
Uh, missed the following paragraph ...

This is why it renames the interfaces to a temporary name before
waiting, so there's never a chain deadlock.  You'd need a system with
twice the number of interfaces as there were maximum udev processes,
with every single one needing renaming and swapping, and be unlucky
enough for all the wrong ones to be queued at the same time.

I suspect if a sysadmin really reached that, their box is powerful
enough to increase the number of udev children *anyway*.

Scott
-- 
Scott James Remnant
scott@ubuntu.com

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