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Date: Wed, 18 Apr 2007 12:32:52 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Christoph Pfister <christophpfister@gmail.com>
Cc: =?utf-8?B?Uy7Dh2HEn2xhcg==?= Onur <caglar@pardus.org.tr>,
       linux-kernel@vger.kernel.org, Michael Lothian <mike@fireburn.co.uk>,
       Christophe Thommeret <hftom@free.fr>, Jurgen Kofler <kaffeine@gmx.net>,
       Ulrich Drepper <drepper@redhat.com>
Subject: Re: Kaffeine problem with CFS
Message-ID: <20070418103252.GA1621@elte.hu>
References: <19a3b7a80704150955x4e1d809eh929b0f931f842a06@mail.gmail.com> <20070418082744.GA14009@elte.hu> <19a3b7a80704180157g604f4cecna51a49bd1f4c7d38@mail.gmail.com> <20070418090117.GA20764@elte.hu> <19a3b7a80704180213i1ac84b2ch2b35220b62e3b67a@mail.gmail.com> <20070418091714.GA23446@elte.hu> <19a3b7a80704180225x3c8d6d60g366126862f05150@mail.gmail.com> <20070418092805.GA23125@elte.hu> <19a3b7a80704180252j72c955bcna5df5cb7057e6756@mail.gmail.com> <20070418101706.GA29031@elte.hu>
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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.

	Ingo