linux-kernel - Re: [RFC v3 1/6] Track the active utilisation

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Date:   Tue, 25 Oct 2016 11:29:16 +0200
From:   luca abeni <luca.abeni@...tn.it>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@....com>,
        Claudio Scordino <claudio@...dence.eu.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC v3 1/6] Track the active utilisation

Hi Daniel,

On Tue, 25 Oct 2016 11:09:52 +0200
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:
[...]
> > +static void add_running_bw(struct sched_dl_entity *dl_se, struct
> > dl_rq *dl_rq) +{
> > +	u64 se_bw = dl_se->dl_bw;
> > +
> > +	dl_rq->running_bw += se_bw;
> > +}  
> 
> why not...
> 
> static *inline*
> void add_running_bw(struct sched_dl_entity *dl_se, struct dl_rq
> *dl_rq) {
> 	dl_rq->running_bw += dl_se->dl_bw;
> }
> 
> am I missing something?

I do not know... Maybe I am the one missing something :)
I assumed that the compiler is smart enough to inline the function (and
to avoid creating a local variable on the stack), but if there is
agreement I can change the function in this way.



			Thanks,
				Luca


> 
> > +static void sub_running_bw(struct sched_dl_entity *dl_se, struct
> > dl_rq *dl_rq) +{
> > +	u64 se_bw = dl_se->dl_bw;
> > +
> > +	dl_rq->running_bw -= se_bw;
> > +	if (WARN_ON(dl_rq->running_bw < 0))
> > +		dl_rq->running_bw = 0;
> > +}  
> 
> (if I am not missing anything...)
> 
> the same in the above function: use inline and remove the se_bw
> variable.
> 
> -- Daniel