Re: [patch 2/3] nohz: change signal tick dependency to wakeup CPUs of member tasks

[Frederic Weisbecker]

On Thu, Jan 28, 2021 at 05:21:36PM -0300, Marcelo Tosatti wrote:
> Rather than waking up all nohz_full CPUs on the system, only wakeup 
> the target CPUs of member threads of the signal.
> 
> Reduces interruptions to nohz_full CPUs.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
> 
> Index: linux-2.6/kernel/time/tick-sched.c
> ===================================================================
> --- linux-2.6.orig/kernel/time/tick-sched.c
> +++ linux-2.6/kernel/time/tick-sched.c
> @@ -444,9 +444,20 @@ EXPORT_SYMBOL_GPL(tick_nohz_dep_clear_ta
>   * Set a per-taskgroup tick dependency. Posix CPU timers need this in order to elapse
>   * per process timers.
>   */
> -void tick_nohz_dep_set_signal(struct signal_struct *sig, enum tick_dep_bits
> bit)

Why not keeping the signal struct as a parameter?

Thanks.