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

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Message-ID: <20161118114248.29c88568@gandalf.local.home>
Date:   Fri, 18 Nov 2016 11:42:48 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     luca abeni <luca.abeni@...tn.it>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@....com>,
        Claudio Scordino <claudio@...dence.eu.com>
Subject: Re: [RFC v3 1/6] Track the active utilisation

On Fri, 18 Nov 2016 15:23:59 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

 
> That said; there's something to be said for:
> 
> 	u64 running_bw;
> 
> static void add_running_bw(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
> {
> 	u64 old = dl_rq->running_bw;
> 
> 	dl_rq->running_bw += dl_se->dl_bw;
> 	SCHED_WARN_ON(dl_rq->running_bw < old); /* overflow */
> }
> 
> static void sub_running_bw(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
> {
> 	u64 old = dl_rq->running_bw;
> 
> 	dl_rq->running_bw -= dl_se->dl_bw;
> 	SCHED_WARN_ON(dl_rq->running_bw > old); /* underflow */
> }
> 

Acked-by: me

-- Steve