linux-kernel - Re: [PATCH 9/9] sched: Push down pre_schedule() and idle

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Message-ID: <20140130152208.GA5002@laptop.programming.kicks-ass.net>
Date:	Thu, 30 Jan 2014 16:22:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Paul Turner <pjt@...gle.com>,
	Benjamin Segall <bsegall@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 9/9] sched: Push down pre_schedule() and idle_balance()

On Thu, Jan 30, 2014 at 01:45:07PM +0100, Vincent Guittot wrote:
> On 28 January 2014 18:16, Peter Zijlstra <peterz@...radead.org> wrote:
> > +idle:
> > +       idle_exit_fair(rq);
> 
> It should be idle_enter_fair.
> 
> we want to update the statistic with the running time of other classes
> than CFS.
> 
> The use case is:
> 
> exit idle
> put_prev_task_idle
> --> idle_exit_fair (account elapsed idle time)
> pick_next_task other than fair tasks
> switch between "other than fair" tasks
> ...
> no more "other than fair" tasks to schedule
> pick_next_task_fair
> --> no fair task on the rq
> --> jump to simple
> --> idle_enter_fair (account elapsed running time of other class
> before trying to pull fair task from other CPUs)
> --> idle_balance()
> ...

Right.. terminal confusion on this topic it seems. Fixed it up.
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