linux-kernel - Re: [PATCH v2 4/7] sched: Add pelt

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Date:   Mon, 13 May 2019 13:48:29 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Quentin Perret <quentin.perret@....com>
Subject: Re: [PATCH v2 4/7] sched: Add pelt_rq tracepoint

On 05/13/19 14:14, Peter Zijlstra wrote:
> On Fri, May 10, 2019 at 12:30:10PM +0100, Qais Yousef wrote:
> 
> > +DECLARE_TRACE(pelt_rq,
> > +	TP_PROTO(int cpu, const char *path, struct sched_avg *avg),
> > +	TP_ARGS(cpu, path, avg));
> > +
> 
> > +static __always_inline void sched_trace_pelt_cfs_rq(struct cfs_rq *cfs_rq)
> > +{
> > +	if (trace_pelt_rq_enabled()) {
> > +		int cpu = cpu_of(rq_of(cfs_rq));
> > +		char path[SCHED_TP_PATH_LEN];
> > +
> > +		cfs_rq_tg_path(cfs_rq, path, SCHED_TP_PATH_LEN);
> > +		trace_pelt_rq(cpu, path, &cfs_rq->avg);
> > +	}
> > +}
> > +
> > +static __always_inline void sched_trace_pelt_rt_rq(struct rq *rq)
> > +{
> > +	if (trace_pelt_rq_enabled()) {
> > +		int cpu = cpu_of(rq);
> > +
> > +		trace_pelt_rq(cpu, NULL, &rq->avg_rt);
> > +	}
> > +}
> > +
> > +static __always_inline void sched_trace_pelt_dl_rq(struct rq *rq)
> > +{
> > +	if (trace_pelt_rq_enabled()) {
> > +		int cpu = cpu_of(rq);
> > +
> > +		trace_pelt_rq(cpu, NULL, &rq->avg_dl);
> > +	}
> > +}
> 
> Since it is only the one real tracepoint, how do we know which avg is
> which?

Good question. I missed that to be honest since we are mainly interested in cfs
and I was focused into not adding too many tracepoints..

I'm happy to create a tracepoint per class assuming that's what you're
suggesting.

Thanks

--
Qais Yousef