Re: [PATCH][RFC]: mutex: adaptive spin

[Linus Torvalds]

On Tue, 6 Jan 2009, Steven Rostedt wrote:
> 
> Caching the rq is an interesting idea. But since the rq struct is local to 
> sched.c, what would be a good API to do this?

Just move the whole "spin_or_schedule()" into sched.c, and you're all 
done.

Yeah, that requires having sched.c know a bit about mutex locking rules, 
but the data structures are already exported in <linux/mutex.h>, and while 
_normal_ code should never care or know exactly how it is used, I think 
the scheduler might as well. Mutexes are clearly very much a scheduling 
entity, so it's not too much of a break with internal knowledge.

		Linus
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