linux-kernel - Re: Kaffeine problem with CFS

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Date:	Wed, 18 Apr 2007 12:53:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Pfister <christophpfister@...il.com>
Cc:	S.Çağlar Onur <caglar@...dus.org.tr>,
	linux-kernel@...r.kernel.org,
	Michael Lothian <mike@...eburn.co.uk>,
	Christophe Thommeret <hftom@...e.fr>,
	Jurgen Kofler <kaffeine@....net>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: Kaffeine problem with CFS


* Ingo Molnar <mingo@...e.hu> wrote:

> hm. I've reviewed all uses of demux_lock. ./src/xine-engine/demux.c 
> does this:
> 
>         pthread_mutex_unlock( &stream->demux_lock );
> 
>         lprintf ("sched_yield\n");
> 
>         sched_yield();
>         pthread_mutex_lock( &stream->demux_lock );
> 
> why is this done? CFS has definitely changed the yield implementation 
> so there could be some connection.
> 
> OTOH, in the 'hung' state none of the straces suggests any yield() 
> call.

yeah, there's no yield() call in any of the straces so i'd exclude this 
as a possibility .

	Ingo
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