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

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Message-ID: <20210212122521.GA90839@lothringen>
Date:   Fri, 12 Feb 2021 13:25:21 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/3] nohz: change signal tick dependency to wakeup CPUs
 of member tasks

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@...hat.com>
> 
> 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.