linux-kernel - Re: [PATCHv2] cpufreq/schedutil: Only bind threads if needed

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Message-ID: <b60bd51b-14e9-4b5c-adfe-bf546691a94d@arm.com>
Date: Thu, 24 Oct 2024 10:13:57 +0100
From: Christian Loehle <christian.loehle@....com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Viresh Kumar <viresh.kumar@...aro.org>, Qais Yousef
 <qyousef@...alina.io>, Vincent Guittot <vincent.guittot@...aro.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 linux-pm <linux-pm@...r.kernel.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Pierre Gondois <pierre.gondois@....com>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCHv2] cpufreq/schedutil: Only bind threads if needed

On 10/7/24 11:42, Christian Loehle wrote:
> On 10/1/24 19:31, Rafael J. Wysocki wrote:
>> On Fri, Sep 27, 2024 at 10:59 AM Christian Loehle
>> <christian.loehle@....com> wrote:
>>>
>>> Remove the unconditional binding of sugov kthreads to the affected CPUs
>>> if the cpufreq driver indicates that updates can happen from any CPU.
>>> This allows userspace to set affinities to either save power (waking up
>>> bigger CPUs on HMP can be expensive) or increasing performance (by
>>> letting the utilized CPUs run without preemption of the sugov kthread).
>>>
>>> Signed-off-by: Christian Loehle <christian.loehle@....com>
>>
>> Acked-by: Rafael J. Wysocki <rafael@...nel.org>
>>
>> and I'm assuming that this will go in via tip.
> 
> Peter, is that fine with you?
> 
> @Juri: I didn't add your (somewhat implied?) ACK on v2, so I'd be happy to
> get it on the dl_task_check_affinity() part.
> 

Peter,
gentle ping on this.
Thank you.

Regards,
Christian