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

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Message-Id: <f2df49f4-0396-0b90-d491-719a76bd6a1e@linux.ibm.com>
Date:   Thu, 5 Dec 2019 17:12:15 +0530
From:   Parth Shah <parth@...ux.ibm.com>
To:     Dietmar Eggemann <dietmar.eggemann@....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 12/5/19 2:54 PM, Dietmar Eggemann wrote:
> 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?

We can include this in kernel/sched/sched.h itself unless we have any plans
to use it outside the scheduler subsystem. I will then add it as specified
in next revision.

> 
> [...]
>