Re: [Xen-devel] [PATCH] Add a timer mode that disables pending missed ticks

[Dave Winchell <dwinchell@xxxxxxxxxxxxxxx>]

ok, I'll try your new code and let you know what
I find.

-Dave

Keir Fraser wrote:

> On 8/11/07 14:43, "Dave Winchell" <dwinchell@xxxxxxxxxxxxxxx> wrote:
>
>  
>
> > I agree that this could be a problem. I have an idea that could give us full
> > SYNC and eliminate the long periods without clock interrupts.
> > In pt_process_missed_ticks() when missed_ticks > 0 set pt->run_timer = 1.
> > In pt_save_timer():
> >
> >    list_for_each_entry ( pt, head, list )
> >        if(!pt->run_timer)
> >             stop_timer(&pt->timer);
> >
> > And in pt_timer_fn():
> >
> >    pt->run_timer = 0;
> >
> > So, for a guest that misses a tick, we will interrupt him once from the
> > descheduled state and then leave him alone in the descheduled state.
> >    
> Well, I'd rather not complicate the code if it's avoidable. I checked in a
> SYNC/ASYNC combo and code simplification as changeset 16341, and it'd be
> interesting to know how that fares against your suggested scheme. I suppose
> as long as we're better than ntpd's tolerance it doesn't actually matter all
> that much.
>
> -- Keir
>
>
>  
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