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

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Message-ID: <20110905105253.2787b91f@infradead.org>
Date:	Mon, 5 Sep 2011 10:52:53 -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 23:08:53 +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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