linux-kernel - Re: [PATCH v7 11/23] sched: Add a initial sketch of the find_proxy

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Message-ID: <CANDhNCqWTpu4xY+Dopp3e0MHR4tQUhM0LHgwgokwSGagDqrkaQ@mail.gmail.com>
Date: Thu, 21 Dec 2023 11:12:09 -0800
From: John Stultz <jstultz@...gle.com>
To: Metin Kaya <metin.kaya@....com>
Cc: LKML <linux-kernel@...r.kernel.org>, Joel Fernandes <joelaf@...gle.com>, 
	Qais Yousef <qyousef@...gle.com>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, 
	Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Valentin Schneider <vschneid@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Ben Segall <bsegall@...gle.com>, Zimuzo Ezeozue <zezeozue@...gle.com>, 
	Youssef Esmat <youssefesmat@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Daniel Bristot de Oliveira <bristot@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Boqun Feng <boqun.feng@...il.com>, "Paul E. McKenney" <paulmck@...nel.org>, 
	Xuewen Yan <xuewen.yan94@...il.com>, K Prateek Nayak <kprateek.nayak@....com>, 
	Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com
Subject: Re: [PATCH v7 11/23] sched: Add a initial sketch of the
 find_proxy_task() function

On Thu, Dec 21, 2023 at 4:55 AM Metin Kaya <metin.kaya@....com> wrote:
> On 20/12/2023 12:18 am, John Stultz wrote:
> >
> Super-nit: s/Add a/Add an/ in commit header.

Thanks for catching that!

> > +#ifdef CONFIG_SCHED_PROXY_EXEC
> > +static inline bool task_is_blocked(struct task_struct *p)
> > +{
> > +     if (!sched_proxy_exec())
> > +             return false;
> > +
> > +     return !!p->blocked_on && p->blocked_on_state != BO_RUNNABLE;
> > +}
> > +#else /* !SCHED_PROXY_EXEC */
> > +static inline bool task_is_blocked(struct task_struct *p)
> > +{
> > +     return false;
> > +}
> > +#endif /* SCHED_PROXY_EXEC */
> > +
>
> We can drop #else part, IMHO. Because sched_proxy_exec() already returns
> false in !CONFIG_SCHED_PROXY_EXEC case.

Oh, good point. That is a nice simplification.

thanks
-john