Messages in this thread | | | Date | Thu, 6 Jul 2017 18:10:47 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 0/9] Remove spin_unlock_wait() |
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On Thu, Jul 06, 2017 at 08:21:10AM -0700, Paul E. McKenney wrote: > And yes, there are architecture-specific optimizations for an > empty spin_lock()/spin_unlock() critical section, and the current > arch_spin_unlock_wait() implementations show some of these optimizations. > But I expect that performance benefits would need to be demonstrated at > the system level.
I do in fact contended there are any optimizations for the exact lock+unlock semantics.
The current spin_unlock_wait() is weaker. Most notably it will not (with exception of ARM64/PPC for other reasons) cause waits on other CPUs.
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