linux-kernel - Re: [PATCH 8/9] sched: Clean up idle task SMP logic

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Message-ID: <CAKfTPtDv19H2EpjPRC1xuJU6CkDzddBe_VETRTtxKFXshkhSQg@mail.gmail.com>
Date:	Thu, 30 Jan 2014 11:52:01 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 8/9] sched: Clean up idle task SMP logic

Hi Peter,

Acked-by: Vincent Guittot <vincent.guittot@...aro.org>

Vincent

On 28 January 2014 18:16, Peter Zijlstra <peterz@...radead.org> wrote:
> The idle post_schedule hook is just a vile waste of time, furthermore
> it appears unneeded, move the idle_enter_fair() call into
> pick_next_task_idle().
>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Vincent Guittot <vincent.guittot@...aro.org>
> Cc: alex.shi@...aro.org
> Cc: mingo@...nel.org
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>
> ---
>  kernel/sched/idle_task.c |    9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
>
> --- a/kernel/sched/idle_task.c
> +++ b/kernel/sched/idle_task.c
> @@ -19,11 +19,6 @@ static void pre_schedule_idle(struct rq
>         idle_exit_fair(rq);
>         rq_last_tick_reset(rq);
>  }
> -
> -static void post_schedule_idle(struct rq *rq)
> -{
> -       idle_enter_fair(rq);
> -}
>  #endif /* CONFIG_SMP */
>  /*
>   * Idle tasks are unconditionally rescheduled:
> @@ -40,8 +35,7 @@ pick_next_task_idle(struct rq *rq, struc
>
>         schedstat_inc(rq, sched_goidle);
>  #ifdef CONFIG_SMP
> -       /* Trigger the post schedule to do an idle_enter for CFS */
> -       rq->post_schedule = 1;
> +       idle_enter_fair(rq);
>  #endif
>         return rq->idle;
>  }
> @@ -105,7 +99,6 @@ const struct sched_class idle_sched_clas
>  #ifdef CONFIG_SMP
>         .select_task_rq         = select_task_rq_idle,
>         .pre_schedule           = pre_schedule_idle,
> -       .post_schedule          = post_schedule_idle,
>  #endif
>
>         .set_curr_task          = set_curr_task_idle,
>
>
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