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charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Le Wednesday 13 Nov 2019 à 15:09:47 (+0100), Dietmar Eggemann a écrit : > On 13.11.19 14:30, Vincent Guittot wrote: > > On Wed, 13 Nov 2019 at 11:50, Dietmar Eggemann wrote: > >> > >> On 12.11.19 16:05, Vincent Guittot wrote: > >>> Le Tuesday 12 Nov 2019 à 15:48:13 (+0100), Vincent Guittot a écrit : > > [...] > > >>>> @@ -7493,9 +7495,9 @@ static void update_blocked_averages(int cpu) > >>>> * that RT, DL and IRQ signals have been updated before updating CFS. > >>>> */ > >>>> curr_class = rq->curr->sched_class; > >>>> - update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class); > >>>> - update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class); > >>>> - update_irq_load_avg(rq, 0); > >>>> + decayed |= update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class); > >>>> + decayed |= update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class); > >>>> + decayed |= update_irq_load_avg(rq, 0); > >> > >> Why not 'decayed = update_cfs_rq_load_avg()' like in the > >> !CONFIG_FAIR_GROUP_SCHED case? > > > > Because it is handled by the update_load_avg() in > > for_each_leaf_cfs_rq_safe() loop > > > > This means that we can have 2 calls to cpufreq_update_util in > > update_blocked_average() but at least the values will be up to date in > > both calls unlike previously. > > > > I'm going to prepare an additional patch to remove this useless call. > > I have also seen some possible further optimization that i need to > > study a bit more before preparing a patch > > I see. The update_load_avg() call for the taskgroup skeleton se > (cfs_rq->tg->se[cpu]). But what happens to the cpu which only has the > root cfs_rq i the list? It doesn't have a skeleton se. you're right. I have to add the following to make sure it will be called diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 2eb1aa8..9fc077c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7604,9 +7604,13 @@ static void update_blocked_averages(int cpu) cpu, cfs_rq == &rq->cfs ? 0 : (long)cfs_rq->tg ); - if (update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq)) + if (update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq)) { update_tg_load_avg(cfs_rq, 0); + if (cfs_rq == &rq->cfs) + decayed = 1; + } + trace_sched_load_contrib_blocked(cpu, &cfs_rq->avg, cfs_rq == &rq->cfs ? 0 : (long)cfs_rq->tg );