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Subject: Re: [patch] voluntary-preempt-2.6.8-rc3-O5
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Florian Schmidt <mista.tapas@gmx.net>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
       jackit-devel <jackit-devel@lists.sourceforge.net>,
       Paul Davis <paul@linuxaudiosystems.com>
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On Thu, 2004-08-12 at 17:54, Lee Revell wrote:
> I still have not had a chance to test with the latest
> patches & config changes.

Here are all the log entries produced during this test:

rlrevell@mindpipe:~$ for test in 1 2 3 4 5; do echo; echo "Test $test";
jackd -n 100000 --realtime -d alsa --rate 48000 -D -P hw:0,0 -C hw:0,2
-p 32 -S >> mm2; done

http://krustophenia.net/2.6.8-rc3-O5-A2/kern.log.txt

When one jackd process is running, starting another jackd process, 
using a different device produces an xrun in the first.  If mlockall-test 
is run while a jackd process is running, this also produces an xrun in 
the jackd process.

So, it seems that if a SCHED_FIFO process opens a PCM device using mmap, 
then mlockall's the memory, then another process mlockall's memory, the 
result is an xrun 100% of the time.

Lee