lkml.org 
[lkml]   [2008]   [Jan]   [14]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] Remove timer frequency choice if tickless is enabled
FromPeter Zijlstra <>
DateMon, 14 Jan 2008 09:28:15 +0100
On Mon, 2008-01-14 at 09:25 +0100, Ingo Molnar wrote:
> (lkml Cc:-ed)
> 
> * Carlos R. Mafra <crmafra2@gmail.com> wrote:
> 
> >  choice
> >  	prompt "Timer frequency"
> > +	depends on !NO_HZ
> >  	default HZ_250
> >  	help
> >  	 Allows the configuration of the timer frequency. It is customary
> 
> we are not there yet to be able to do this. With NO_HZ the tick is only 
> disabled when we go idle - but it still runs (and we rely on it, for 
> example in the scheduler code) while we are non-idle. Peter Zijlstra is 
> working on the 'high-res scheduler tick' feature to remove the scheduler 
> dependencies.

Yes, and even then we're still not there, there are various other
features that are tick driven, among them the RCU quiecent state
machine.



\
 
 \ /
  Last update: 2008-01-14 09:31    [from the cache]
©2003-2008