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

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Message-ID: <a19be99d1e1a282bd5c6b9af60ea6c0417223000.camel@linux.intel.com>
Date:   Mon, 21 Mar 2022 17:22:32 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>, 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
Cc:     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 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;

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

Tim