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Date:	Mon, 3 Nov 2008 11:29:16 +0100
From:	Ingo Molnar <>
To:	Peter Zijlstra <>
Cc:	Dimitri Sivanich <>,,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>,
	Andrew Morton <>
Subject: Re: [PATCH] small optimization to update_curr_rt

* Peter Zijlstra <> wrote:

> On Fri, 2008-10-31 at 08:03 -0500, Dimitri Sivanich wrote:
> > A very minor improvement, but might it be better to check sched_rt_runtime(rt_rq)
> > before taking the rt_runtime_lock?
> Yes, I think its ok to do so.
> Like pointed out in the other thread, there are two races:
>  - sched_rt_runtime() going to RUNTIME_INF, and that will be handled
>    properly by sched_rt_runtime_exceeded()
>  - sched_rt_runtime() going to !RUNTIME_INF, and here we can miss an
>    accounting cycle, but I don't think that is something to worry too
>    much about.
> Acked-by: Peter Zijlstra <>

applied to tip/sched/rt, thanks guys!

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