linux-kernel - Re: [PATCH 3/3] sched: Implement task_nice and task

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Message-ID: <52E70F0C.3080507@cn.fujitsu.com>
Date:	Mon, 27 Jan 2014 20:59:40 -0500
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org, raistlin@...ux.it,
	juri.lelli@...il.com, clark.williams@...il.com, mingo@...hat.com,
	rostedt@...dmis.org
Subject: Re: [PATCH 3/3] sched: Implement task_nice and task_prio as static
 inline functions.

On 01/27/2014 07:16 AM, Peter Zijlstra wrote:
> On Mon, Jan 27, 2014 at 08:09:54PM -0500, Dongsheng Yang wrote:
>> On 01/27/2014 05:32 AM, Peter Zijlstra wrote:
>>> On Mon, Jan 27, 2014 at 05:15:39PM -0500, Dongsheng Yang wrote:
>>>> +/**
>>>> + * task_prio - return the priority value of a given task.
>>>> + * @p: the task in question.
>>>> + *
>>>> + * Return: The priority value as seen by users in /proc.
>>>> + * RT tasks are offset by -200. Normal tasks are centered
>>>> + * around 0, value goes from -16 to +15.
>>>> + */
>>>> +static inline int task_prio(const struct task_struct *p)
>>>> +{
>>>> +	return p->prio - MAX_RT_PRIO;
>>>> +}
>>> Who would ever want to use/rely on this? It doesn't make any sense. And
>>> therefore it shouldn't ever be considered time critical.
>> I just copy it from kernel/sched/core.c. Currently, it is used in
>> fs/proc/array.c.
> Just leave it there. Nobody should use this value anyhow.

Okey.
>
>>>> +/**
>>>> + * task_nice - return the nice value of a given task.
>>>> + * @p: the task in question.
>>>> + *
>>>> + * Return: The nice value [ -20 ... 0 ... 19 ].
>>>> + */
>>>> +static inline int task_nice(const struct task_struct *p)
>>>> +{
>>>> +	return TASK_NICE(p);
>>>> +}
>>> Urgh, no. Just remove the macro already. Although arguably we should
>>> remove ->static_prio and clean up that entire mess.
>>>
>> Oops, sorry for the noise. I am a newbie here, could you help to point out
>> that
>>   which tree is the latest version for sched. Thanx :)
> tip/sched/core or tip/master, but that's not the issue. There's no point
> in having an inline and a macro that do the exact same thing.

Okey, so, do you mean I should remove the macro of TASK_NICE and
implement it directly in inline task_nice?  If so, I will send v2 soon.
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