[alsa-devel] [RFC PATCH] ALSA: hda - suspend codecs in parallel

Lin, Mengdong mengdong.lin at intel.com
Tue Nov 26 14:39:03 CET 2013

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai at suse.de]
> Sent: Tuesday, November 26, 2013 2:36 PM
> To: Lin, Mengdong

> > > I thought that the recent workqueue is performed asynchronously as
> > > default (unless an ordered workqueue is used), so it should be
> > > enough to have a single workqueue in the bus, and flush it.
> >
> > If using the single work queue in the bus, I observe that the codecs are
> suspended one after one, not in parallel.
> You need to increase the max active of the queue via
> workqueue_set_max_active().  Otherwise it's default to 1 when you
> created via create_workqueue().  Also, it'd be better with WQ_UNBOUND
> flag in this case, I guess.

Thank you! workqueue_set_max_active() works. I use max codec number 15 as the max_active.
But there is no obvious improvement by using WQ_UNBOUND, so it's not used in the 2nd version patch.


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