linux-kernel - Re: [PATCH 06/23] sched,psci: Convert to sched_set

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Date:   Mon, 27 Apr 2020 17:58:15 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        rostedt@...dmis.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, daniel.lezcano@...aro.org,
        sudeep.holla@....com
Subject: Re: [PATCH 06/23] sched,psci: Convert to sched_set_fifo*()


On 27/04/20 17:35, Qais Yousef wrote:
>>      drv = cpuidle_get_cpu_driver(dev);
>> @@ -349,11 +347,6 @@ static int suspend_test_thread(void *arg
>>      if (atomic_dec_return_relaxed(&nb_active_threads) == 0)
>>              complete(&suspend_threads_done);
>>
>> -	/* Give up on RT scheduling and wait for termination. */
>> -	sched_priority.sched_priority = 0;
>> -	if (sched_setscheduler_nocheck(current, SCHED_NORMAL, &sched_priority))
>> -		pr_warn("Failed to set suspend thread scheduler on CPU %d\n",
>> -			cpu);
>
> No need for sched_set_normal() here before the busy loop?
>

Given the tasks become TASK_INTERRUPTIBLE, and the only extra thing they'll
do is exit (barring the parking weirdness), changing them back to CFS
seems superfluous.

> Thanks