Re: 2.6.4 on Alpha uninterruptible sleep of processes

[Ivan Kokshaysky]

On Fri, Mar 12, 2004 at 09:52:15PM +0100, Marc Giger wrote:
> Right now I'm recompiling the kernel. So you say this patch isn't a fix
> but a test? 

Yes. That patch just reverts new alpha semaphore stuff which went
into 2.6.4.

> This time I have additionally "semaphore debugging" enabled,
> perhaps it's useful for you.

Thanks, this might be helpful.

> > The answer is here:
> > http://bugzilla.kernel.org/show_bug.cgi?id=397
> 
> That's no answer, that's a statement:-) Do know the exactly reason why
> it should be a bad idea? Is it mostly a bad idea on alpha?

Hmm, I haven't discussed that with Richard, so I can't speak for him :-)
IMHO, the benefits of the kernel preempt support in general are more than
doubtful, the level of complexity that it adds to the kernel code is
just unacceptable.

Ivan.
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