linux-kernel - Re: [PATCH 2/2] sched: prioritize non-migratable tasks over migratableones

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Message-Id: <480EFD4E.BA47.005A.0@novell.com>
Date:	Wed, 23 Apr 2008 07:11:42 -0600
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Dmitry Adamushko" <dmitry.adamushko@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH 2/2] sched: prioritize non-migratable tasks over
	migratableones

>>> On Wed, Apr 23, 2008 at  8:58 AM, in message
<Pine.LNX.4.58.0804230854210.23815@...dalf.stny.rr.com>, Steven Rostedt
<rostedt@...dmis.org> wrote: 


> 
> I'm not giving an Ack on this patch (not yet). My main concern here is
> that this is performing on a verge of policy change. As you stated, this
> is a known issue. One that can be avoided by giving RT tasks different
> priorities.  It is known that two tasks with the same priority fighting
> for the same CPUS (even if one is migratable and one is not) has
> non-deterministic behaviour.
> 
> This patch needs a bit of running through the grind to see what effects it
> has before going in.

Perfectly reasonable stance, Steve.  Thanks for the review!

-Greg

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