linux-kernel - Re: [PATCH v2] sched/debug: Add new tracepoint to track cpu

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Date:   Fri, 28 Aug 2020 11:27:25 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     vincent.donnefort@....com
Cc:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
        valentin.schneider@....com
Subject: Re: [PATCH v2] sched/debug: Add new tracepoint to track cpu_capacity

On 08/28/20 10:00, vincent.donnefort@....com wrote:
> From: Vincent Donnefort <vincent.donnefort@....com>
> 
> rq->cpu_capacity is a key element in several scheduler parts, such as EAS
> task placement and load balancing. Tracking this value enables testing
> and/or debugging by a toolkit.
> 
> Signed-off-by: Vincent Donnefort <vincent.donnefort@....com>
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h

[...]

> +int sched_trace_rq_cpu_capacity(struct rq *rq)
> +{
> +	return rq ?
> +#ifdef CONFIG_SMP
> +		rq->cpu_capacity
> +#else
> +		SCHED_CAPACITY_SCALE
> +#endif
> +		: -1;
> +}
> +EXPORT_SYMBOL_GPL(sched_trace_rq_cpu_capacity);
> +

The placement of this #ifdef looks odd to me. But FWIW

Reviewed-by: Qais Yousef <qais.yousef@....com>

Cheers

--
Qais Yousef