linux-kernel - Re: [PATCH 08/18] sched: consider runnable load average in move

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Message-ID: <871uekf20w.fsf@sejong.aot.lge.com>
Date:	Fri, 21 Dec 2012 13:43:43 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Alex Shi <alex.shi@...el.com>
Cc:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>, rob@...dley.net,
	mingo@...hat.com, peterz@...radead.org, gregkh@...uxfoundation.org,
	andre.przywara@....com, rjw@...k.pl, paul.gortmaker@...driver.com,
	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, pjt@...gle.com,
	vincent.guittot@...aro.org
Subject: Re: [PATCH 08/18] sched: consider runnable load average in move_tasks

On Wed, 12 Dec 2012 14:26:44 +0800, Alex Shi wrote:
> On 12/12/2012 12:41 PM, Preeti U Murthy wrote:
>> Also why can't p->se.load_avg_contrib be used directly? as a return
>> value for task_h_load_avg? since this is already updated in
>> update_task_entity_contrib and update_group_entity_contrib.
>
> No, only non task entity goes to  update_group_entity_contrib. not task
> entity.

???

But task entity goes to __update_task_entity_contrib()?


/* Compute the current contribution to load_avg by se, return any delta */
static long __update_entity_load_avg_contrib(struct sched_entity *se)
{
	long old_contrib = se->avg.load_avg_contrib;

	if (entity_is_task(se)) {
		__update_task_entity_contrib(se);
	} else {
		__update_tg_runnable_avg(&se->avg, group_cfs_rq(se));
		__update_group_entity_contrib(se);
	}

	return se->avg.load_avg_contrib - old_contrib;
}


Thanks,
Namhyung
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