linux-kernel - Re: Bug in scheduler when using rt

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Date:	Thu, 20 Jan 2011 07:12:18 +0100
From:	Mike Galbraith <efault@....de>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, samu.p.onkalo@...ia.com,
	mingo@...e.hu,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tglx <tglx@...utronix.de>, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Bug in scheduler when using rt_mutex

On Thu, 2011-01-20 at 13:30 +0800, Yong Zhang wrote:
> On Thu, Jan 20, 2011 at 12:59 PM, Mike Galbraith <efault@....de> wrote:
> > or the task is enqueued
> > at it's last offset as usual for runnable tasks.
> 
> But shouldn't we task the tasks as WAKEUP, through the task has been
> waked on other sched_class?

We don't need to play any games with it afaiks, just normalize it, and
the rest is taken care of automatically.
 
> IOW, I wonder if we should play with place_entity() at some point.

If the task returns as a sleeper, place entity() will be called when it
is awakened, so it's sleep credit will be clipped as usual.  So vruntime
can be much less than min_vruntime at class exit time, and it doesn't
matter, clipping on wakeup after re-entry takes care of it.. if that's
what you were thinking about.

	-Mike

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