* Re: [PATCH] Remove timer frequency choice if tickless is enabled
[not found] ` <20080112032718.GA3946@Pilar.socal.rr.com>
@ 2008-01-14 8:25 ` Ingo Molnar
2008-01-14 8:28 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: Ingo Molnar @ 2008-01-14 8:25 UTC (permalink / raw)
To: Carlos R. Mafra; +Cc: linux-kernel, Peter Zijlstra
(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.
Ingo
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] Remove timer frequency choice if tickless is enabled
2008-01-14 8:25 ` [PATCH] Remove timer frequency choice if tickless is enabled Ingo Molnar
@ 2008-01-14 8:28 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2008-01-14 8:28 UTC (permalink / raw)
To: Ingo Molnar; +Cc: Carlos R. Mafra, linux-kernel
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] ` <20080112032718.GA3946@Pilar.socal.rr.com>
2008-01-14 8:25 ` [PATCH] Remove timer frequency choice if tickless is enabled Ingo Molnar
2008-01-14 8:28 ` Peter Zijlstra
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