linux-kernel - Re: [sched-devel, patch-rfc] rework of "prioritize non-migratabletasks over migratable ones"

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Date:	Mon, 16 Jun 2008 13:54:52 -0600
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [sched-devel, patch-rfc] rework of "prioritize
	non-migratabletasks over migratable ones"

>>> On Mon, Jun 16, 2008 at  3:17 PM, in message
<1213643862.16944.142.camel@...ns>, Peter Zijlstra <a.p.zijlstra@...llo.nl>
wrote: 
> On Mon, 2008-06-16 at 19:59 +0200, Dmitry Adamushko wrote:
> 
>> One way or another, we have different aritifacts (and mine have likely
>> more) but conceptually, both "violates" POSIX if a strict round-robin
>> scheduling is required.
> 
> http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_08.html#t
> ag_02_08_04_01
> 
> Is quite strict on what FIFO should do, and I know of two points where
> we deviate and should work to match.

Thanks for the link, Peter.  When you read that, its pretty clear that this whole concept violates the standard.  Its probably best to just revert the patch and be done with it.

Regards,
-Greg

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