linux-kernel - Re: [RFC PATCH 4/5] sched/events: Introduce sched

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Date:   Tue, 28 Mar 2017 10:05:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@....com>,
        Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [RFC PATCH 4/5] sched/events: Introduce sched_entity load
 tracking trace event

On Tue, Mar 28, 2017 at 07:35:40AM +0100, Dietmar Eggemann wrote:
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 04d4f81b96ae..d1dcb19f5b55 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -2940,6 +2940,8 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
>  
>  	if (cfs_rq)
>  		trace_sched_load_cfs_rq(cfs_rq);
> +	else
> +		trace_sched_load_se(container_of(sa, struct sched_entity, avg));
>  
>  	return decayed;
>  }
> @@ -3162,6 +3164,7 @@ static inline int propagate_entity_load_avg(struct sched_entity *se)
>  	update_tg_cfs_load(cfs_rq, se);
>  
>  	trace_sched_load_cfs_rq(cfs_rq);
> +	trace_sched_load_se(se);
>  
>  	return 1;
>  }

Having back-to-back tracepoints is disgusting.