linux-kernel - Re: [patch] CFS scheduler, -v15

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Date:	Wed, 6 Jun 2007 12:12:28 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS scheduler, -v15

On Thu, May 31, 2007 at 05:09:08PM +0200, Ingo Molnar wrote:
> i'm pleased to announce release -v15 of the CFS scheduler patchset.

Do I smell a bug when a task switches its scheduling classes?

Lets say a task was in real-time class for a long time and switches to
fair-sched class. When update_curr() is called on this new fair-sched
task, some of required fields (for ex: exec_start) are uninitialized and can 
lead to bogus calculations?

Also, real-time tasks are currently influencing fair clock calculations
(because there is only one raw_weighted_load field per runqueue). Is
that intentional?

-- 
Regards,
vatsa
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