26.02.2014, 13:35, "Kirill Tkhai" <tk...@yandex.ru>: > 26.02.2014, 13:07, "Peter Zijlstra" <pet...@infradead.org>: > >> On Wed, Feb 26, 2014 at 03:37:38AM +0100, Mike Galbraith wrote: >>> BTW, I noticed you can no longer turn the turn the noisy thing off since >>> we grew DL. I added an old SGI boot parameter to tell it to go away. >> You're talking about the rt badnwidth timer, right? >> >> 1) why won't it go away with DL added? > > We know nothing about rt_time and rt_runtime values, when we are doing > update_curr_dl(). > > rt_time maybe not zero, so we increment rt_time. > > rt_rq->rt_runtime maybe less than maximum available for RT(and for dl too), > because someone could borrow a part of rt_runtime during previous > balance_runtime(). > > If dl task uses all available runtime, we always will have "idle = 0" > > if (rt_rq->rt_time || rt_rq->rt_nr_running) > idle = 0; > > in do_sched_rt_period_timer(). Timer will be restarted. > > This is boundary case, of course.
I wrote this in assumtion, that patch like Juri's is applied [https://lkml.org/lkml/2014/2/25/307]. In current tip.git state above is always. >> 2) it should never appear when !rt_bandwidth_enabled(), so if you set >> sysctl_sched_rt_runtime to -1 all this should go away already, no extra >> patches required. > > -- > 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/ -- 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/
