Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning

[Linus Torvalds]

On Wed, 7 Jan 2009, Steven Rostedt wrote:
> 
> What would be interesting is various benchmarks against all three.
> 
> 1) no mutex spinning.
> 2) get_task_struct() implementation.
> 3) spin_or_sched implementation.

One of the issues is that I cannot convince myself that (2) is even 
necessarily correct. At least not without having all cases happen inder 
the mutex spinlock - which they don't. Even with the original patch, the 
uncontended cases set and cleared the owner field outside the lock.

			Linus
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