[OpenAFS-devel] cannot shutdown 1.3.81 on linux 2.6.12-rc[12]

[Roland Kuhn]

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Hi Chas!

On Apr 20, 2005, at 5:33 PM, chas williams - CONTRACTOR wrote:

> In message 
> <Pine.GSO.4.61-042.0504201116450.26028@johnstown.andrew.cmu.edu>,Der
> rick J Brashear writes:
>>> i would suggest that the mutexes in afs not be conditional at all.
>>> it seems like there is little benefit to not having them.
>>
>> Overhead?
>
> the overhead of the afs global mutex is going to be pretty small.
> other platforms don't bother with optimizing it away for the
> uniprocessor case and i dont see complaints about performance
> issues related to afs glock.

Please forgive my ignorance concerning the openafs source, but which 
parts are synchronized by the AFS_GLOCK? I know that I can find the 
details with grep, but what is the big picture?

How could I find out if it's AFS_GLOCK(), which is reducing 
performance? Or, more generally, how can I best test AFS locking? I'm 
running Ingo Molnar's realtime-preempt patch and lightweight usage has 
not shown any problems yet (just the shutdown failure when running an 
UP kernel).

Ciao,
					Roland

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