linux-kernel - RE: Player Thread is not woken after period elapsed

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Message-ID: <3CA6C6D9F70D314CA34352990B57DA1507C420F15C@bgsmsx502.gar.corp.intel.com>
Date:	Mon, 5 Sep 2011 23:38:49 +0530
From:	"Nallasellan, Singaravelan" <singaravelan.nallasellan@...el.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Player Thread is not woken after period elapsed

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@...radead.org] 
Sent: Monday, September 05, 2011 11:23 PM
To: Nallasellan, Singaravelan
Cc: alsa-devel@...a-project.org; linux-kernel@...r.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@...el.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
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