linux-kernel - Re: [PATCH 7/9] sched: Add migrate

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Message-ID: <20200925165047.iey2dlcdn4im2vv4@linutronix.de>
Date:   Fri, 25 Sep 2020 18:50:47 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
        qais.yousef@....com, swood@...hat.com, valentin.schneider@....com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vincent.donnefort@....com
Subject: Re: [PATCH 7/9] sched: Add migrate_disable()

On 2020-09-21 18:36:04 [+0200], Peter Zijlstra wrote:
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1700,6 +1700,68 @@ void check_preempt_curr(struct rq *rq, s
>  
>  #ifdef CONFIG_SMP
>  
> +#ifdef CONFIG_PREEMPT_RT
…
> +static inline bool is_migration_disabled(struct task_struct *p)
> +{
> +	return p->migration_disabled;
> +}

Just a thought: having this with int as return type and defined in a
header file then it could be used in check_preemption_disabled() and in
the tracing output.

> +#else
> +
> +static inline void migrate_disable_switch(struct rq *rq, struct task_struct *p) { }
> +
> +static inline bool is_migration_disabled(struct task_struct *p)
> +{
> +	return false;
> +}
> +
> +#endif

Sebastian