new timer code in CVS

new timer code in CVS

[Jaroslav Kysela]

Hi all,

	I've commited improved kernel code for the ALSA timer interface. 
It should fix many troubles (my own lowlatency kernel with HZ=1000 easily 
hung up my laptop when I used older code for the system timer) and there 
are major improvements especialy in locking and handling of slave timers
and slower callbacks (like sequencer one).
	Please, if you have some time, test this new code (especially with 
the sequencer and rtctimer) and report me any bugs or problems.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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Re: new timer code in CVS

[Takashi Iwai]

At Tue, 4 Feb 2003 14:30:30 +0100 (CET),
Jaroslav Kysela wrote:
> 
> Hi all,
> 
> 	I've commited improved kernel code for the ALSA timer interface. 
> It should fix many troubles (my own lowlatency kernel with HZ=1000 easily 
> hung up my laptop when I used older code for the system timer) and there 
> are major improvements especialy in locking and handling of slave timers
> and slower callbacks (like sequencer one).

the sequencer switches to tasklet inside if it takes too long time
(too much event processed).  i'll remove this check if the timer
callback is invoked already via tasklet.

> 	Please, if you have some time, test this new code (especially with 
> the sequencer and rtctimer) and report me any bugs or problems.

it seems working fine, so far.


thanks,

Takashi


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Re: new timer code in CVS

[Jaroslav Kysela]

On Wed, 5 Feb 2003, Takashi Iwai wrote:

> At Tue, 4 Feb 2003 14:30:30 +0100 (CET),
> Jaroslav Kysela wrote:
> > 
> > Hi all,
> > 
> > 	I've commited improved kernel code for the ALSA timer interface. 
> > It should fix many troubles (my own lowlatency kernel with HZ=1000 easily 
> > hung up my laptop when I used older code for the system timer) and there 
> > are major improvements especialy in locking and handling of slave timers
> > and slower callbacks (like sequencer one).
> 
> the sequencer switches to tasklet inside if it takes too long time
> (too much event processed).  i'll remove this check if the timer
> callback is invoked already via tasklet.

Yep, the sequencer callback is now "slow" (it will be called always using 
tasklet) so the limit of processed events can be removed.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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Re: new timer code in CVS

[Takashi Iwai]

At Wed, 5 Feb 2003 12:17:28 +0100 (CET),
Jaroslav wrote:
> 
> On Wed, 5 Feb 2003, Takashi Iwai wrote:
> 
> > At Tue, 4 Feb 2003 14:30:30 +0100 (CET),
> > Jaroslav Kysela wrote:
> > > 
> > > Hi all,
> > > 
> > > 	I've commited improved kernel code for the ALSA timer interface. 
> > > It should fix many troubles (my own lowlatency kernel with HZ=1000 easily 
> > > hung up my laptop when I used older code for the system timer) and there 
> > > are major improvements especialy in locking and handling of slave timers
> > > and slower callbacks (like sequencer one).
> > 
> > the sequencer switches to tasklet inside if it takes too long time
> > (too much event processed).  i'll remove this check if the timer
> > callback is invoked already via tasklet.
> 
> Yep, the sequencer callback is now "slow" (it will be called always using 
> tasklet) so the limit of processed events can be removed.

ok, done on cvs.


Takashi


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