linux-kernel - Re: [PATCH v2] sched: Make initial SCHED_RR timeslace RR

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Message-ID: <CANgE6yT9oYW8fBmWk2SO2j77ts136tD=cV8RSRXkui6p1AJDVg@mail.gmail.com>
Date:	Tue, 21 Feb 2012 20:25:59 +0900
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v2] sched: Make initial SCHED_RR timeslace RR_TIMESLICE

2012/2/21 Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>:
> (2012/02/20 22:30), Peter Zijlstra wrote:
>> On Thu, 2012-02-16 at 14:52 +0900, Hiroshi Shimamoto wrote:
>>> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>>>
>>> Current the initial SCHED_RR timeslice of init_task is HZ, which means
>>> 1s, and is not same as the default SCHED_RR timeslice DEF_TIMESLICE.
>>>
>>> Change that initial timeslice to the DEF_TIMESLICE.
>>>
>>> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>>
>> No real objection, should we take the opportunity to rename to
>> RR_TIMESLICE or somesuch?
>>
>
> sounds reasonable.

Oops, the below patch is wrong.
Definitely I missed something.

Will resend, sorry about that.

>
> ===
> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>
> Current the initial SCHED_RR timeslice of init_task is HZ, which means
> 1s, and is not same as the default SCHED_RR timeslice DEF_TIMESLICE.
>
> Change the initial timeslice to the RR_TIMESLICE, which is renamed from
> DEF_TIMESLICE to clarify it's for SCHED_RR.
>
> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  include/linux/init_task.h |    2 +-
>  include/linux/sched.h     |    6 ++++++
>  kernel/sched/sched.h      |    4 ----
>  3 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/init_task.h b/include/linux/init_task.h
> index 9c66b1a..f994d51 100644
> --- a/include/linux/init_task.h
> +++ b/include/linux/init_task.h
> @@ -149,7 +149,7 @@ extern struct cred init_cred;
>        },                                                              \
>        .rt             = {                                             \
>                .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
> -               .time_slice     = HZ,                                   \
> +               .time_slice     = RR_TIMESLICE,                         \
>                .nr_cpus_allowed = NR_CPUS,                             \
>        },                                                              \
>        .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 2df7646..ee882cb 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1234,6 +1234,12 @@ struct sched_rt_entity {
>  #endif
>  };
>
> +/*
> + * default timeslice is 100 msecs (used only for SCHED_RR tasks).
> + * Timeslices get refilled after they expire.
> + */
> +#define RR_TIMESLICE           (100 * HZ / 1000)
> +
>  struct rcu_node;
>
>  enum perf_event_task_context {
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 8a2c768..c0660a1 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -36,11 +36,7 @@ extern __read_mostly int scheduler_running;
>
>  /*
>  * These are the 'tuning knobs' of the scheduler:
> - *
> - * default timeslice is 100 msecs (used only for SCHED_RR tasks).
> - * Timeslices get refilled after they expire.
>  */
> -#define DEF_TIMESLICE          (100 * HZ / 1000)
>
>  /*
>  * single value that denotes runtime == period, ie unlimited time.
> --
> 1.7.7.6
>
>
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