On Sat, 29 Dec 2012, Frederic Weisbecker wrote:
> @@ -163,6 +164,8 @@ static int __init tick_nohz_full_setup(char *str)
> return 1;
> }
> __setup("full_nohz=", tick_nohz_full_setup);
> +#else
> +#define have_full_nohz_mask (0)
> #endif
>
> /*
> @@ -512,6 +515,10 @@ static bool can_stop_idle_tick(int cpu, struct
> tick_sched *ts)
> return false;
> }
>
> + /* If there are full nohz CPUs around, we need to keep the timekeeping
> duty */
> + if (have_full_nohz_mask && tick_do_timer_cpu == cpu)
> + return false;
> +
> return true;
> }
>
>
Ok so I guess this means that if I setup all cpus as nohz then a random
one will continue to do timekeeping?
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