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

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Message-ID: <3CA6C6D9F70D314CA34352990B57DA1507C4275D58@bgsmsx502.gar.corp.intel.com>
Date:	Tue, 6 Sep 2011 19:49:35 +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

> please do not top post!
> 
Ok. 
> correcting that mistake for you for this time
> 
Thanks so much.
> 
> >> > 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.
> 
Unfortunately, I am stuck with that version as the product that I work on is on that version. 
> 
> >> > Will you provide some hint on how to go about identifying the root
> >> > cause?
> 
> >> https://lkml.org/lkml/2011/9/5/201
> 
I manually ported the changes and verified. I still see the issue. Found more information which might throw more light into the problem. 
p->state in try_to_wake_up() is 0 when it is expected to be 2 or 3.

> > 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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