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Re: [PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock statistics

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On Fri, 11 Sep 2015, Waiman Long wrote:

>A sample of statistics counts after system bootup (with vCPU
>overcommit) was:
>
>hash_hops_count=9001
>kick_latencies=138047878
>kick_unlock_count=9001
>kick_wait_count=9000
>spurious_wakeup=3
>wait_again_count=2
>wait_head_count=10
>wait_node_count=8994
>wake_latencies=713195944

Any reason you chose not to make the stats per-cpu? The locking
numbers don't have to be exact, so you can easily get away with
it and suffer from much less overhead that resorting to atomics.
Obviously assuming that reading/collecting the stats is done
infrequently, such as between workloads or at bootup as you did.

Thanks,
Davidlohr
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[PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock statistics Waiman Long <Waiman.Long@hpe.com> - 2015-09-11 20:40 +0200
  Re: [PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock  statistics Davidlohr Bueso <dave@stgolabs.net> - 2015-09-12 01:20 +0200
    Re: [PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock statistics Waiman Long <waiman.long@hpe.com> - 2015-09-14 17:30 +0200
      Re: [PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock  statistics Davidlohr Bueso <dave@stgolabs.net> - 2015-09-14 23:50 +0200
        Re: [PATCH v6 4/6] locking/pvqspinlock: Collect slowpath lock statistics Waiman Long <waiman.long@hpe.com> - 2015-09-15 05:50 +0200

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