linux-kernel - Re: [PATCH] sched: let __sched_period() use rq cfs's nr

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Date:	Tue, 7 Jul 2015 13:28:18 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	byungchul.park@....com
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: let __sched_period() use rq cfs's nr_running

On Mon, Jul 6, 2015 at 9:40 PM,  <byungchul.park@....com> wrote:
> From: Byungchul Park <byungchul.park@....com>
>
> __sched_period() returns a period which a rq can have. the period has to be
> stretched by the number of task *the rq has*, when nr_running > nr_latency.
> otherwise, task slice can be very smaller than sysctl_sched_min_granularity
> depending on the position of tg hierarchy when CONFIG_FAIR_GROUP_SCHED.


Hmm, rq_of(cfs_rq)->cfs should point to the root cfs_rq whose
->nr_running is number of running entities at root level? This
doesn't look right.
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