linux-kernel - Re: [RFC PATCH 2/5] sched/events: Introduce cfs

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Message-ID: <20170328165754.u3nwxjveyhkh75fo@hirez.programming.kicks-ass.net>
Date:   Tue, 28 Mar 2017 18:57:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@....com>,
        Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [RFC PATCH 2/5] sched/events: Introduce cfs_rq load tracking
 trace event

On Tue, Mar 28, 2017 at 06:44:59PM +0200, Peter Zijlstra wrote:
> ---
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -2849,7 +2849,7 @@ static u32 __compute_runnable_contrib(u6
>   *            = u_0 + u_1*y + u_2*y^2 + ... [re-labeling u_i --> u_{i+1}]
>   */
>  static __always_inline int
> -__update_load_avg(u64 now, int cpu, struct sched_avg *sa,
> +___update_load_avg(u64 now, int cpu, struct sched_avg *sa,
>  		  unsigned long weight, int running, struct cfs_rq *cfs_rq)
>  {
>  	u64 delta, scaled_delta, periods;
> @@ -2953,6 +2953,26 @@ __update_load_avg(u64 now, int cpu, stru
>  	return decayed;
>  }
>  
> +static int
> +__update_load_avg_blocked_se(u64 now, int cpu, struct sched_avg *sa)
> +{
> +	return ___update_load_avg(now, cpu, sa, 0, 0, NULL);
> +}
> +
> +static int
> +__update_load_avg_se(u64 now, int cpu, struct sched_avg *sa,
> +		     unsigned long weight, int running)
> +{
> +	return ___update_load_avg(now, cpu, sa, weight, running, NULL);
> +}
> +
> +static int
> +__update_load_avg(u64 now, int cpu, struct sched_avg *sa,
> +		  unsigned long weight, int running, struct cfs_rq *cfs_rq)
> +{
> +	return ___update_load_avg(now, cpu, sa, weight, running, cfs_rq);

Although ideally we'd be able to tell the compiler that cfs_rq will not
be NULL here. Hurmph.. no __builtin for that I think :/

> +}