From: Peter Zijlstra <peterz@infradead.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Paul Turner <pjt@google.com>,
Benjamin Segall <bsegall@google.com>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH 9/9] sched: Push down pre_schedule() and idle_balance()
Date: Thu, 30 Jan 2014 16:22:08 +0100 [thread overview]
Message-ID: <20140130152208.GA5002@laptop.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKfTPtAMmhq0tBpu+pk_uzwrfUM-6Fz4Do1yrzc4NRQS4cZ_-A@mail.gmail.com>
On Thu, Jan 30, 2014 at 01:45:07PM +0100, Vincent Guittot wrote:
> On 28 January 2014 18:16, Peter Zijlstra <peterz@infradead.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.
next prev parent reply other threads:[~2014-01-30 15:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-28 17:16 [PATCH 0/9] Various sched patches -v2 Peter Zijlstra
2014-01-28 17:16 ` [PATCH 1/9] sched: Remove cpu parameter for idle_balance() Peter Zijlstra
2014-01-28 17:16 ` [PATCH 2/9] sched: Fix race in idle_balance() Peter Zijlstra
2014-01-28 17:16 ` [PATCH 3/9] sched: Move idle_stamp up to the core Peter Zijlstra
2014-01-28 17:16 ` [PATCH 4/9] sched/fair: Track cgroup depth Peter Zijlstra
2014-01-28 17:16 ` [PATCH 5/9] sched: Push put_prev_task() into pick_next_task() Peter Zijlstra
2014-01-28 18:46 ` bsegall
2014-01-28 19:14 ` Peter Zijlstra
2014-01-28 17:16 ` [PATCH 6/9] sched/fair: Clean up __clear_buddies_* Peter Zijlstra
2014-01-28 17:16 ` [PATCH 7/9] sched/fair: Optimize cgroup pick_next_task_fair Peter Zijlstra
2014-01-30 12:18 ` Vincent Guittot
2014-01-30 12:37 ` Peter Zijlstra
2014-01-30 12:56 ` Vincent Guittot
2014-01-28 17:16 ` [PATCH 8/9] sched: Clean up idle task SMP logic Peter Zijlstra
2014-01-30 10:52 ` Vincent Guittot
2014-01-28 17:16 ` [PATCH 9/9] sched: Push down pre_schedule() and idle_balance() Peter Zijlstra
2014-01-30 12:45 ` Vincent Guittot
2014-01-30 15:22 ` Peter Zijlstra [this message]
2014-01-28 18:07 ` [PATCH 0/9] Various sched patches -v2 Steven Rostedt
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