On Tue, Sep 20, 2016 at 09:42:41AM -0400, Waiman Long wrote:
> +/*
> + * Spinning threshold before enabling lock handoff.
> + * Each sleep will decrement the threshold by 1/32 of the start value.
> + */
> +#define TO_SPIN_THRESHOLD    (1 << 13)
> +#define TO_SLEEP_DECREMENT   (TO_SPIN_THRESHOLD/32)

Argh, we should really get rid of those stupid numbers. Wasn't there a
patch set working on implementing paravirt functions that would make all
this fixable in a sane way?

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