linux-kernel - Re: [RFC][PATCH] Multimedia scheduling class, take 2

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Date:	Tue, 12 May 2009 08:38:26 +0300
From:	Artem Bityutskiy <dedekind@...dex.ru>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jussi Laako <jussi@...arnerd.net>,
	Peter Zijlstra <peterz@...radead.org>,
	James Courtier-Dutton <James@...erbug.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] Multimedia scheduling class, take 2

Jussi Laako wrote:
> Peter Zijlstra wrote:
>> Right, and I think the solution to this problem is twofold, 1)
>> application writers should start writing (soft) realtime applications if
>> they want (soft) realtime behaviour -- there's just no way around that.
> 
> Just to avoid need for reviewing and reworking ~800 klocs of user space
> code in just gstreamer, here's a second take on patches. This time
> splitting things into smaller pieces. Attached patch exposes 40
> priorities ~ nice values as something accessible through
> sched_()/pthreads API in order to control priorities of individual
> threads. Current Linux implementation of SCHED_OTHER is broken in a way,
> that it exposes only one single priority level - 0. Thus no possibility
> to properly control priorities of threads through pthread API. This is
> patch is against 2.6.29.2 and not tested, but builds. I can also send
> rest of the changes as separate small feature patches as needed.
> However, before doing any more work I would like to hear opinions on
> this and especially what is wrong with the code or idea...

Ingo,

would it be possible to comment on this?

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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