On Thu, Aug 21, 2014 at 02:21:51PM -0700, Andy Lutomirski wrote: > On Aug 18, 2014 3:52 AM, "Chuansheng Liu" <chuansheng....@intel.com> wrote:
> > +void wake_up_if_idle(int cpu) > > +{ > > + struct rq *rq = cpu_rq(cpu); > > + unsigned long flags; > > + > > + if (set_nr_if_polling(rq->idle)) { > > + trace_sched_wake_idle_without_ipi(cpu); > > + } else { > > + > > FWIW, adding: > > if (rq->curr != rq->idle) > return; > > Right here could improve performance on large, mostly non-idle > systems. It would skip the spinlock in most cases. > !is_idle_task() :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/