linux-kernel - Re: [PATCH 05/10] sched/fair: Hoist idle_stamp up from idle

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Message-ID: <2a368b7c-3ecf-9b0c-a930-d2e739ea9b17@arm.com>
Date:   Thu, 25 Oct 2018 14:47:43 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Steve Sistare <steven.sistare@...cle.com>, mingo@...hat.com,
        peterz@...radead.org
Cc:     subhra.mazumdar@...cle.com, dhaval.giani@...cle.com,
        rohit.k.jain@...cle.com, daniel.m.jordan@...cle.com,
        pavel.tatashin@...rosoft.com, matt@...eblueprint.co.uk,
        umgwanakikbuti@...il.com, riel@...hat.com, jbacik@...com,
        juri.lelli@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] sched/fair: Hoist idle_stamp up from idle_balance

Hi Steve,

On 22/10/2018 15:59, Steve Sistare wrote:
[...]
> @@ -6740,8 +6744,19 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
>  	return p;
>  
>  idle:
> +	/*
> +	 * We must set idle_stamp _before_ calling idle_balance(), such that we
> +	 * measure the duration of idle_balance() as idle time.
> +	 */
> +	IF_SMP(rq->idle_stamp = rq_clock(rq);)
> +
>  	new_tasks = idle_balance(rq, rf);
>  
> +	if (new_tasks)
> +		IF_SMP(rq->idle_stamp = 0;)
> +
> +	schedstat_end_time(rq->find_time, time);
	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
That's a stray hunk from 10/10

[...]