Re: spinaphore conceptual draft

[Andi Kleen]

Kyle Moffett <mrmacman_g4@xxxxxxx> writes:

>          if (unlikely(CONFIG_SPINAPHORE_CONTEXT_SWITCH <
>                  ( queued*atomic_get(&sph->hold_time) -
>                    fast_monotonic_count() - start_time

On many architectures (including popular ones like AMD x86-64) 
there is no reliable fast monotonic (1) count unfortunately - except perhaps
jiffies, but that would be far to coarse grained for your purpose.

-Andi

(1) reliable fast monotonic - chose any two instead. 
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