linux-kernel - Re: [PATCH 2/6] sched/core: Propagate parent task's latency requirements to the child task

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Date:   Tue, 22 Mar 2022 15:57:09 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org, parth@...ux.ibm.com,
        qais.yousef@....com, chris.hyser@...cle.com,
        pkondeti@...eaurora.org, Valentin.Schneider@....com,
        patrick.bellasi@...bug.net, David.Laight@...lab.com,
        pjt@...gle.com, pavel@....cz, tj@...nel.org,
        dhaval.giani@...cle.com, qperret@...gle.com
Subject: Re: [PATCH 2/6] sched/core: Propagate parent task's latency
 requirements to the child task

On Tue, 22 Mar 2022 at 01:22, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
>
> On Fri, 2022-03-11 at 17:14 +0100, Vincent Guittot wrote:
> >
> > Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> > ---
> >  init/init_task.c    | 1 +
> >  kernel/sched/core.c | 4 ++++
> >  2 files changed, 5 insertions(+)
> >
> > diff --git a/init/init_task.c b/init/init_task.c
> > index 73cc8f03511a..2afa249c253b 100644
> > --- a/init/init_task.c
> > +++ b/init/init_task.c
> > @@ -78,6 +78,7 @@ struct task_struct init_task
> >       .prio           = MAX_PRIO - 20,
> >       .static_prio    = MAX_PRIO - 20,
> >       .normal_prio    = MAX_PRIO - 20,
> > +     .latency_nice   = 0,
>
> Probably better to use non hardcoded number here
>         .latency_nice   = DEFAULT_LATENCY_NICE;

yes
>
> >       .policy         = SCHED_NORMAL,
> >       .cpus_ptr       = &init_task.cpus_mask,
> >       .user_cpus_ptr  = NULL,
> >
>
> Tim
>