linux-kernel - Re: [RFC PATCH v3 5/6] sched/uclamp: Simplify uclamp_eff

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Date: Tue, 28 May 2024 12:42:48 +0100
From: Hongyan Xia <hongyan.xia2@....com>
To: Dietmar Eggemann <dietmar.eggemann@....com>,
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Juri Lelli <juri.lelli@...hat.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>
Cc: Qais Yousef <qyousef@...alina.io>,
 Morten Rasmussen <morten.rasmussen@....com>,
 Lukasz Luba <lukasz.luba@....com>,
 Christian Loehle <christian.loehle@....com>, pierre.gondois@....com,
 linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 5/6] sched/uclamp: Simplify uclamp_eff_value()

On 26/05/2024 23:52, Dietmar Eggemann wrote:
> On 07/05/2024 14:50, Hongyan Xia wrote:
> 
> [...]
> 
>> +static inline unsigned long uclamp_eff_value(struct task_struct *p,
>> +					     enum uclamp_id clamp_id)
>> +{
>> +	if (uclamp_is_used() && p->uclamp[clamp_id].active)
>> +		return p->uclamp[clamp_id].value;
>> +
>> +	if (clamp_id == UCLAMP_MIN)
>> +		return 0;
>> +
>> +	return SCHED_CAPACITY_SCALE;
> 
> Why not keep using 'return uclamp_none(clamp_id)'  here?

Reason is that uclamp_none() is in core.c.

I could move uclamp_none() into sched.h if needed.