linux-kernel - Re: [PATCH v5 7/7] sched/fair: Fair server interface

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Message-ID: <51ed888b-591a-40aa-9de4-29cf4a84dd69@kernel.org>
Date:   Tue, 7 Nov 2023 14:24:28 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        linux-kernel@...r.kernel.org,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joel Fernandes <joel@...lfernandes.org>,
        Vineeth Pillai <vineeth@...byteword.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Phil Auld <pauld@...hat.com>
Subject: Re: [PATCH v5 7/7] sched/fair: Fair server interface

On 11/7/23 13:38, Peter Zijlstra wrote:
> On Sat, Nov 04, 2023 at 11:59:24AM +0100, Daniel Bristot de Oliveira wrote:
>> Add an interface for fair server setup on debugfs.
>>
>> Each rq have three files under /sys/kernel/debug/sched/rq/CPU{ID}:
>>
>>  - fair_server_runtime: set runtime in ns
>>  - fair_server_period: set period in ns
>>  - fair_server_defer: on/off for the defer mechanism
>>
>> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
>> ---
> 
> I did the below, that gives us:
> 
> /debug/sched/fair_server/cpuX/{runtime,period,defer}

right!

> I wanted to also add:
> 
> /debug/sched/fair_server/{runtime,period,defer}
> 
> to more easily set all CPUs to the same value, but then figured
> userspace will just have to loop.

I thought about that too... and had the same conclusion... let 'em loop.

-- Daniel