linux-kernel - Re: [PATCH] sched: Take thermal pressure into account when determine rt fits capacity

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Message-ID: <CAB8ipk-QAE2_J_kpUVRcq-4KJ0cSGc1JT2oQhdzvrjDu25HsRQ@mail.gmail.com>
Date:   Sun, 1 May 2022 11:20:00 +0800
From:   Xuewen Yan <xuewen.yan94@...il.com>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Xuewen Yan <xuewen.yan@...soc.com>, dietmar.eggemann@....com,
        lukasz.luba@....com, rafael@...nel.org, viresh.kumar@...aro.org,
        mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        di.shen@...soc.com
Subject: Re: [PATCH] sched: Take thermal pressure into account when determine
 rt fits capacity

Hi Qais
Thanks for the patient explanation.:)
And I have some other concerns.

On Wed, Apr 27, 2022 at 6:58 PM Qais Yousef <qais.yousef@....com> wrote:
>
> On 04/27/22 09:38, Xuewen Yan wrote:
> > > > > The best (simplest) way forward IMHO is to introduce a new function
> > > > >
> > > > >         bool cpu_in_capacity_inversion(int cpu);

Maybe the implementation of this function, I have not thought of a
good solution.
(1)how to define the inversion, if the cpu has two
cluster(little/big)，it is easy, but still need mark which is the big
cpu...
(2)because the mainline kernel should be common, if the cpu has three
or more clusters, maybe the mid cpus also would be inversion;
(3)what time update the cpu inversion state, if we judge the cpu
inversion whenever the thermal pressure changed, could we receive the
complexity? because may we should traverse all possible cpu.

Thanks!

---
xuewen.yan