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

Peter Zijlstra
2013-04-04T16:41:09Z

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.