Re: [PATCH v2 2/3] mutex: add support for reservation style locks, v2

Steven Rostedt
2013-04-09T22:28:13Z

On Thu, Apr 04, 2013 at 06:41:02PM +0200, Peter Zijlstra wrote:
> On Thu, 2013-04-04 at 15:31 +0200, Daniel Vetter wrote:
> > The thing is now that you're not expected to hold these locks for a
> > long
> > time - if you need to synchronously stall while holding a lock
> > performance
> > will go down the gutters anyway. And since most current
> > gpus/co-processors
> > still can't really preempt fairness isn't that high a priority,
> > either.
> > So we didn't think too much about that.
>
> Yeah but you're proposing a new synchronization primitive for the core
> kernel.. all such 'fun' details need to be considered, not only those
> few that bear on the one usecase.

Which bares the question, what other use cases are there?

-- Steve