linux-kernel - Re: [RFC PATCH 18/23] sched/task_struct: Add helpers for task classification

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Date:   Tue, 27 Sep 2022 13:52:24 +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 18/23] sched/task_struct: Add helpers for task
 classification

On Fri, Sep 09, 2022 at 04:12:00PM -0700, Ricardo Neri wrote:

>  #ifdef CONFIG_SCHED_TASK_CLASSES
>  	short				class;
> +	short				class_candidate;
> +	char				class_debounce_counter;
>  #endif

That's 5 bytes; is that really needed? 4 would be so much better :-)