RE: Player Thread is not woken after period elapsed

Nallasellan, Singaravelan
2011-09-05T18:09:28Z

Sorry, I have not provided the kernel version. Kernel version is 2.6.35.
However, wait_for_avail() does not have the code similar to the one provided in the patch below. I will give a try.

-----Original Message-----
From: Arjan van de Ven [mailto:arjan@infradead.org]
Sent: Monday, September 05, 2011 11:23 PM
To: Nallasellan, Singaravelan
Cc: alsa-devel@alsa-project.org; linux-kernel@vger.kernel.org
Subject: Re: Player Thread is not woken after period elapsed

On Mon, 5 Sep 2011 23:08:53 +0530
"Nallasellan, Singaravelan" <singaravelan.nallasellan@intel.com> wrote:

> Hi,
>
> When I tried to root cause a glitch in the audio playback, I found a
> weird behavior.
>
> User thread which invokes the writei function which in turn invokes a
> kernel function which waits for the free buffer to write the audio
> data. This kernel function adds this thread to a wake(sleep) queue
> and calls a schedule_timeout (msecs_to_jiffies(10000)).

actually it doesn't... you must be on some really really old kernel or something.

>
> Will you provide some hint on how to go about identifying the root
> cause?

https://lkml.org/lkml/2011/9/5/201

--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings, visit http://www.lesswatts.org