linux-kernel - Re: [RFC PATCH 06/14] sched: aggregate total task

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Message-ID: <87y5s2cbrh.fsf@linux.vnet.ibm.com>
Date:	Fri, 17 Feb 2012 10:11:22 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Paul Turner <pjt@...gle.com>, linux-kernel@...r.kernel.org
Cc:	Venki Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ben Segall <bsegall@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 06/14] sched: aggregate total task_group load

On Wed, 01 Feb 2012 17:38:26 -0800, Paul Turner <pjt@...gle.com> wrote:
> +static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
> +						 int force_update)
> +{
> +	struct task_group *tg = cfs_rq->tg;
> +	s64 tg_contrib;
> +
> +	tg_contrib = cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
> +	tg_contrib -= cfs_rq->tg_load_contrib;
> +
> +	if (force_update || abs64(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
>
Not obvious to me where this 8 is coming from?

Regards
Nikunj

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