On Wed, Jan 15, 2014 at 12:33:55PM -0800, Josh Triplett wrote:
> On Tue, Jan 14, 2014 at 09:20:46PM -0800, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
> >
> > The __run_timers() function currently steps through the list one jiffy at
> > a time in order to update the timer wheel. However, if the timer wheel
> > is empty, no adjustment is needed other than updating ->timer_jiffies.
> > In this case, which is likely to be common for NO_HZ_FULL kernels, the
> > kernel currently incurs a large latency for no good reason. This commit
> > therefore short-circuits this case.
> >
> > Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
> > ---
> > kernel/timer.c | 15 +++++++++++++++
> > 1 file changed, 15 insertions(+)
> >
> > diff --git a/kernel/timer.c b/kernel/timer.c
> > index 2245b7374c3d..295837e5e011 100644
> > --- a/kernel/timer.c
> > +++ b/kernel/timer.c
> > @@ -338,6 +338,17 @@ void set_timer_slack(struct timer_list *timer, int
> > slack_hz)
> > }
> > EXPORT_SYMBOL_GPL(set_timer_slack);
> >
> > +static bool catchup_timer_jiffies(struct tvec_base *base)
> > +{
> > +#ifdef CONFIG_NO_HZ_FULL
> > + if (!base->all_timers) {
> > + base->timer_jiffies = jiffies;
> > + return 1;
> > + }
> > +#endif /* #ifdef CONFIG_NO_HZ_FULL */
> > + return 0;
> > +}
>
> In a function with return type "bool", please use true/false, not 1/0.
>
> Please also document the semantic of the return value.
Done for both, thank you.
Thanx, Paul
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