linux-kernel - Re: [BUG] How to get real-time priority using idle priority

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Message-ID: <20090114073530.GA15644@elte.hu>
Date:	Wed, 14 Jan 2009 08:35:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Brian Rogers <brian@...w.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [BUG] How to get real-time priority using idle priority


* Mike Galbraith <efault@....de> wrote:

> On Wed, 2009-01-14 at 06:31 +0100, Ingo Molnar wrote:
> > What about increasing the weight of SCHED_IDLE tasks from 1 to 2 or 3? 
> > That still makes them mega-nice (which is more than enough), but should 
> > make the math a lot less borderline.
> 
> The weight is currently 2, inv_weight is 1 << 31, which is correct.

then move it up to 5 or so perhaps? We are hitting limits of 64-bit math 
here.

	Ingo
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