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

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Date:	Mon, 5 Sep 2011 11:22:25 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Nallasellan, Singaravelan" <singaravelan.nallasellan@...el.com>
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

On Mon, 5 Sep 2011 23:38:49 +0530
"Nallasellan, Singaravelan" <singaravelan.nallasellan@...el.com> wrote:

please do not top post!

correcting that mistake for you for this time


>> > 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.
>> 

> Sorry, I have not provided the kernel version. Kernel version is
> 2.6.35. 

Please always test bugs like this with a recent kernel. 2.6.35 is
pretty much 6 versions (and 18 months) behind and at that point you
really have to test with something newer first before asking others to
help you and spend their time on your problem.


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

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

> However, wait_for_avail() does not have the code similar to
> the one provided in the patch below. 

the patch is against a recent kernel; no surprise that the code has
changed in the last 18 months....


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