linux-kernel - Re: [RFC 1/3] Introduce latency-tolerance as an per-task attribute

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Date:   Thu, 5 Dec 2019 10:24:41 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Parth Shah <parth@...ux.ibm.com>, Qais Yousef <qais.yousef@....com>
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, vincent.guittot@...aro.org,
        patrick.bellasi@...bug.net, valentin.schneider@....com,
        pavel@....cz, dhaval.giani@...cle.com, qperret@...rret.net,
        David.Laight@...LAB.COM, morten.rasmussen@....com, pjt@...gle.com,
        tj@...nel.org, viresh.kumar@...aro.org, rafael.j.wysocki@...el.com,
        daniel.lezcano@...aro.org
Subject: Re: [RFC 1/3] Introduce latency-tolerance as an per-task attribute

On 03/12/2019 16:47, Parth Shah wrote:
> 
> On 12/3/19 2:06 PM, Qais Yousef wrote:
>> On 11/25/19 15:16, Parth Shah wrote:
>>> Latency-tolerance indicates the latency requirements of a task with respect
>>> to the other tasks in the system. The value of the attribute can be within
>>> the range of [-20, 19] both inclusive to be in-line with the values just
>>> like task nice values.
>>>
>>> latency_tolerance = -20 indicates the task to have the least latency as
>>> compared to the tasks having latency_tolerance = +19.
>>>
>>> The latency_tolerance may affect only the CFS SCHED_CLASS by getting
>>> latency requirements from the userspace.

[...]

>>> diff --git a/include/linux/sched/latency_tolerance.h b/include/linux/sched/latency_tolerance.h

Do we really need an extra header file for this? I know there is
linux/sched/prio.h but couldn't this go into kernel/sched/sched.h?

[...]