linux-kernel - Re: [PATCH v2 2/2] sched/fair, cpufreq: Introduce 'runnable boosting'

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Date:   Fri, 12 May 2023 16:39:59 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Qais Yousef <qyousef@...alina.io>,
        Kajetan Puchalski <kajetan.puchalski@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Vincent Donnefort <vdonnefort@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Abhijeet Dharmapurikar <adharmap@...cinc.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] sched/fair, cpufreq: Introduce 'runnable boosting'

On 12/05/2023 13:32, Peter Zijlstra wrote:
> On Fri, May 12, 2023 at 12:10:29PM +0200, Dietmar Eggemann wrote:

[...]

>> @@ -10561,7 +10568,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
>>  			break;
>>  
>>  		case migrate_util:
>> -			util = cpu_util_cfs(i);
>> +			util = cpu_util_cfs(i, 1);
>>  
>>  			/*
>>  			 * Don't try to pull utilization from a CPU with one
> 
> When you move that comment from cpu_util_cfs() to cpu_util() please also
> add a paragraph about why boost=1 and why these locations, because I'm
> sure we're going to be asking ouselves that at some point.

Will do.