linux-kernel - Re: [RFD] Remove irq

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Date: Thu, 15 Feb 2024 15:46:44 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Ulf Hansson <ulf.hansson@...aro.org>, Daniel Lezcano
 <daniel.lezcano@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Daniel Bristot de Oliveira
 <bristot@...hat.com>
Subject: Re: [RFD] Remove irq_timings

On Thu, Feb 15 2024 at 12:23, Ulf Hansson wrote:
> On Wed, 14 Feb 2024 at 22:39, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>> On 14/02/2024 22:17, Thomas Gleixner wrote:
>> > Daniel!
>> >
>> > It's 7 years now that we merged irq timings into the kernel, but we
>> > still have zero users for this.
>
> Wow, is it really 7 years since then. :-)
>
>> >
>> > I'm tempted to declare this experiment failed and remove the whole thing
>> > for good.
>> >
>> > Comments?
>>
>> I worked on an irq cpuidle governor which had better results than the
>> menu governor and equal than the teo governor. But I never succeed to
>> have better results without putting some arbitrary when computing the
>> next event.
>>
>> At one moment, Daniel Bristot de Oliveira (Cc'ed) was thinking to may be
>> use it for the deadline scheduler.
>>
>> Ulf (Cc'ed) may be has a plan for the next event for the CPU cluster.
>
> Yes, I still have that plan, but haven't been able to run some real tests yet.
>
>>
>> But if no one has plan to use it, there is no good reason to keep it and
>> I'm fine if we remove it.
>
> Besides that the code isn't really used at the moment, is it also
> blocking us from doing some cleanup/refactoring or other related code?

No. I just stumbled over it (again) and wondered whether it is ever
going to be used or not. If not there is no point to carry dead weight
around, but there is no hurry.

Thanks,

        tglx