Re: [Xen-devel] [PATCH 3/3] xen: RCU: make the period of the idle timer adaptive.

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2017-09-26 at 09:24 -0600, Jan Beulich wrote:
> > > > On 15.09.17 at 20:01, <dario.faggioli@xxxxxxxxxx> wrote:
> > @@ -495,8 +507,18 @@ void rcu_idle_timer_stop()
> >  
> >  static void rcu_idle_timer_handler(void* data)
> >  {
> > -    /* Nothing, really... Just count the number of times we fire
> > */
> >      perfc_incr(rcu_idle_timer);
> > +
> > +    if ( !cpumask_empty(&rcu_ctrlblk.cpumask) )
> > +    {
> > +        idle_timer_period = min_t(s_time_t, IDLE_TIMER_PERIOD_MAX,
> > +                                  idle_timer_period +
> > IDLE_TIMER_PERIOD_INCR);
> > +    }
> > +    else
> > +    {
> > +        idle_timer_period = max_t(s_time_t, IDLE_TIMER_PERIOD_MIN,
> > +                                  idle_timer_period -
> > IDLE_TIMER_PERIOD_DECR);
> > +    }
> 
> Pointless braces. And do you really need min_t()/max_t() here,
> rather than just min()/max()?
> 
I probably can. This must be a leftover from a version when the time of
idle_timer_period, and of the IDLE_TIMER_PERIOD_{MIN,MAX} constants
wasn't matching.

Sorry!

Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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