linux-kernel - Re: [PATCH] cpufreq: schedutil: Update last_update from sugov_set_iowait

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Message-ID: <20170718113552.v7fzhghp6oxwfoq4@e106622-lin>
Date:   Tue, 18 Jul 2017 12:35:52 +0100
From:   Juri Lelli <Juri.Lelli@....com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        joelaf@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: schedutil: Update last_update from
 sugov_set_iowait_boost()

On 18/07/17 16:55, Viresh Kumar wrote:
> On 18-07-17, 12:20, Juri Lelli wrote:
> > Hi Viresh,
> > 
> > On 18/07/17 10:24, Viresh Kumar wrote:

[...]

> > 
> > It actually belongs here, IMHO. We update other fields (util, max,
> > flags)
> 
> Yeah, because they have bigger roles and aren't specific to iowait
> boost.
> 
> > before looking at iowait. Why hiding the time update into a
> > function dealing with only one of such fields?
> 
> But last_update is very much specific to iowait_boost only and so it
> should be updated from sugov_set_iowait_boost() IMHO.
> 

Huh, I see you point. However, I'm using it also to deal with stale CFS
util values in my patches [1]. Sure, not mainline yet, but I guess I'll
have to sort of revert your proposed change for my next version. Or
think of a better idea. :)

Thanks,

- Juri

[1] http://marc.info/?l=linux-kernel&m=149924526528298&w=2