Re: [patch 0/9] mutex subsystem, -V4

[Andrew Morton]

Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote:
>
> 
> > hm.  16 CPUs hitting the same semaphore at great arrival rates.  The cost
> > of a short spin is much less than the cost of a sleep/wakeup.  The machine
> > was doing 100,000 - 200,000 context switches per second.
> 
> interesting.. this might be a good indication that a "spin a bit first"
> mutex slowpath for some locks might be worth implementing...

If we see a workload which is triggering such high context switch rates,
maybe.  But I don't think we've seen any such for a long time.

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