linux-kernel - Re: [RFC PATCH 01/23] sched/task_struct: Introduce classes of tasks

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Date:   Wed, 14 Sep 2022 15:46:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Valentin Schneider <vschneid@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, "Tim C . Chen" <tim.c.chen@...el.com>
Subject: Re: [RFC PATCH 01/23] sched/task_struct: Introduce classes of tasks

On Fri, Sep 09, 2022 at 04:11:43PM -0700, Ricardo Neri wrote:

>  include/linux/sched.h | 7 +++++++
>  init/Kconfig          | 9 +++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index e7b2f8a5c711..acc33dbaa47c 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -117,6 +117,8 @@ struct task_group;
>  					 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
>  					 TASK_PARKED)
>  
> +#define TASK_CLASS_UNCLASSIFIED		-1

> +#ifdef CONFIG_SCHED_TASK_CLASSES
> +	/* Class of task that the scheduler uses for task placement decisions */
> +	short				class;
> +#endif

You're missing a hunk for init/init_task.c for this non-zero init value.

Does we really have to use a signed type and non-zero init value?