linux-kernel - Re: [PATCH 0/3] [GIT PULL] sched: clean ups and a minor fix

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Message-ID: <20130213083314.GA7149@gmail.com>
Date:	Wed, 13 Feb 2013 09:33:14 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 0/3] [GIT PULL] sched: clean ups and a minor fix


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> Ingo,
> 
> The first of the patches is a minor fix to when a woken RT task is about
> to preempt a pinned RT task, push_rt_task() is called to try to
> migrate the woken task if possible (to avoid preempting a pinned RT
> task that may be the second highest priority task in the system).
> 
> But the issue is that push_rt_task() won't push it if the woken task
> is higher priority even if the task to be preempted is pinned.
> 
> The second two patches is more of a clean up to remove the idle
> hooks in the scheduler proper, and to use the pre/post schedule
> methods instead.
> 
> This allows interrupts to be enabled in the idle balance, which slightly
> helps latencies, especially for the -rt kernel. Other patches can be
> added on top. Maybe in the future preemption could be enabled during
> the idle balance as well. But that remains to be seen.
> 
> Please pull the latest tip/sched/core tree, which can be found at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> tip/sched/core
> 
> Head SHA1: 1db13ecf89054d39922e7b3323d124c7e2921560
> 
> 
> Steven Rostedt (Red Hat) (3):
>       sched/rt: Fix push_rt_task() to have the same checks as the caller did
>       sched: Move idle_balance() to post_schedule
>       sched: Enable interrupts in idle_balance()
> 
> ----
>  kernel/sched/core.c      |    3 ---
>  kernel/sched/fair.c      |    8 +++++---
>  kernel/sched/idle_task.c |   10 ++++++++++
>  kernel/sched/rt.c        |   15 ++++++++++-----
>  4 files changed, 25 insertions(+), 11 deletions(-)

Pulled, thanks a lot Steve!

	Ingo
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