Re: [PATCH v11 3/5] sched/core: uclamp: Propagate system defaults to root group

[Michal Koutný]

On Mon, Jul 08, 2019 at 09:43:55AM +0100, Patrick Bellasi <patrick.bellasi@xxxxxxx> wrote:
> +static void uclamp_update_root_tg(void)
> +{
> +	struct task_group *tg = &root_task_group;
> +
> +	uclamp_se_set(&tg->uclamp_req[UCLAMP_MIN],
> +		      sysctl_sched_uclamp_util_min, false);
> +	uclamp_se_set(&tg->uclamp_req[UCLAMP_MAX],
> +		      sysctl_sched_uclamp_util_max, false);
> +
> +	cpu_util_update_eff(&root_task_group.css);
> +}
cpu_util_update_eff internally calls css_for_each_descendant_pre() so
this should be protected with rcu_read_lock().