Re: spinlock requests (was RE: [Xen-devel] [Patch] don't spin with irq disabled)

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Keir Fraser wrote:
> I suspect the existing uses of rwlock in Xen actually are because that
> seemed a natural fit for the code -- obvious split between reader and writer
> critical sections -- rather than because of excessive serialisation if using
> a normal spinlock. I strongly disbelieve that lock acquire/release is a
> significant performance bottleneck for us right now.
>   
Aren't rwlocks sufficiently less efficient than spinlocks that you'd 
tend to use the latter if you don't think contention is an issue?
   J

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