linux-kernel - Re: [PATCH] tracing: Use task_nice() in function __update_max

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Message-ID: <52E18CF5.5090202@cn.fujitsu.com>
Date:	Thu, 23 Jan 2014 16:43:17 -0500
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	fweisbec@...il.com, mingo@...hat.com
Subject: Re: [PATCH] tracing: Use task_nice() in function __update_max_tr()
 to get the nice value of task.

On 01/23/2014 03:26 AM, Peter Zijlstra wrote:
> On Thu, Jan 23, 2014 at 12:11:04PM -0500, Dongsheng Yang wrote:
>> On 01/22/2014 11:00 PM, Steven Rostedt wrote:
>>> Bah, I just noticed that TASK_NICE is in kernel/sched/sched.h not
>>> include/linux/sched.h
>>>
>>> Peter, is there a reason that task_nice() is not a static inline in
>>> sched.h and have these macros there too? They only reference fields in
>>> task_struct that are already defined there. I don't see why they need
>>> to be private to kernel/sched.
>> Agree. These macros are useful to other modules out of kernel/sched.
>> But they are private to kernel/sched currently.
> And the floodgates open.. _why_ would a module care about nice values?
> That's sounds just so full of wrong.

Sorry for my misnomer with 'modules'. Actually I mean other subsystems in
kernel, such as trace, sched, rcu. :)

I did not mean the module for modprobe.

Sorry for my terrible expression :(.
>

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