[Bug nptl/23962] Very high overhead of pthread_spin_lock on multi-node NUMA systems

[kemi.wang at intel dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23962

kemi <kemi.wang at intel dot com> changed:

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                 CC|                            |kemi.wang at intel dot com

--- Comment #3 from kemi <kemi.wang at intel dot com> ---
(In reply to Carlos O'Donell from comment #1)
> (In reply to H.J. Lu from comment #0)
> > Created attachment 11437 [details]
> > A workload with pthread_spin_lock
> > 
> > This workload with pthread_spin_lock shows that:
> 
> ... what is the solution? Implement MCS locks in userspace using per-cpu
> data?

We have tried MCS way with per-thread data, and can reduce spinlock overhead a
lot when heavily lock contention, but that will be one more pointer required in
pthread_spinlock_t which will break the existed ABI. I wonder if it's
acceptable?

Hongjiu has another way for the same purpose.

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