Ping?
On Tue, Dec 30, 2014 at 05:52:28PM -0200, Marcelo Tosatti wrote: > > Commit "timers: do not raise softirq unconditionally", allows for timer > wheel processing (__run_timers) to be delayed for long periods of time. > > The effect is that > > loops = jiffies - base->timer_jiffies > > Can grow to very large values resulting in __run_timers taking hundreds > of milliseconds to execute. > > Fix by creating an upper bound on the number of loops to be processed. > This allows a nohz=off kernel to achieve desired latencies. > > Signed-off-by: Marcelo Tosatti <[email protected]> > > diff --git a/kernel/timer.c b/kernel/timer.c > index f59e18c..c128416 100644 > --- a/kernel/timer.c > +++ b/kernel/timer.c > @@ -1488,6 +1488,12 @@ void run_local_timers(void) > } > #endif > > + if (time_after_eq(jiffies, base->timer_jiffies)) { > + unsigned long jiffies_delta = jiffies - base->timer_jiffies; > + if (jiffies_delta > TVR_SIZE) > + raise_softirq(TIMER_SOFTIRQ); > + } > + > if (!base->active_timers) > goto out; > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
