linux-kernel - Re: [PATCH 2/2][v2] sched: Extract the task putting code from pick_next

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Date:   Tue, 21 Apr 2020 16:00:42 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Valentin Schneider <valentin.schneider@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2][v2] sched: Extract the task putting code from
 pick_next_task()

Hi,
On Mon, Apr 20, 2020 at 06:44:29PM +0100, Valentin Schneider wrote:
> 
> On 20/04/20 16:01, Chen Yu wrote:
> > Introduce a new function finish_prev_task() to do the balance
> > when necessary, and then put previous task back to the run queue.
> > This function is extracted from pick_next_task() to prepare for
> > future usage by other type of task picking logic.
> >
> > No functional change.
> >
> 
> With the absolutely tiny nit below:
> 
> Reviewed-by: Valentin Schneider <valentin.schneider@....com>
> 
> > Suggested-by: Peter Zijlstra <peterz@...radead.org>
> > Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> > ---
> >  kernel/sched/core.c | 39 +++++++++++++++++++++++----------------
> >  1 file changed, 23 insertions(+), 16 deletions(-)
> >
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 3a61a3b8eaa9..bf59a5cf030c 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -3904,6 +3904,28 @@ static inline void schedule_debug(struct task_struct *prev, bool preempt)
> >       schedstat_inc(this_rq()->sched_count);
> >  }
> >
> > +static void finish_prev_task(struct rq *rq, struct task_struct *prev,
> > +			     struct rq_flags *rf)
> > +{
> > +	const struct sched_class *class;
> > +#ifdef CONFIG_SMP
> 
> Nit: I would've put that declaration within the ifdef, given it isn't used
> outside of it.
> 
Okay, I'll do.

Thanks,
Chenyu