forked from luck/tmp_suning_uos_patched
371bf42732
schedutil governor relies on cfs_rq's util_avg to choose the OPP when CFS tasks are running. When the CPU is overloaded by CFS and RT tasks, CFS tasks are preempted by RT tasks and in this case util_avg reflects the remaining capacity but not what CFS want to use. In such case, schedutil can select a lower OPP whereas the CPU is overloaded. In order to have a more accurate view of the utilization of the CPU, we track the utilization of RT tasks. Only util_avg is correctly tracked but not load_avg and runnable_load_avg which are useless for rt_rq. rt_rq uses rq_clock_task and cfs_rq uses cfs_rq_clock_task but they are the same at the root group level, so the PELT windows of the util_sum are aligned. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Morten.Rasmussen@arm.com Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: claudio@evidence.eu.com Cc: daniel.lezcano@linaro.org Cc: dietmar.eggemann@arm.com Cc: joel@joelfernandes.org Cc: juri.lelli@redhat.com Cc: luca.abeni@santannapisa.it Cc: patrick.bellasi@arm.com Cc: quentin.perret@arm.com Cc: rjw@rjwysocki.net Cc: valentin.schneider@arm.com Cc: viresh.kumar@linaro.org Link: http://lkml.kernel.org/r/1530200714-4504-3-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
#ifdef CONFIG_SMP
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int __update_load_avg_blocked_se(u64 now, int cpu, struct sched_entity *se);
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int __update_load_avg_se(u64 now, int cpu, struct cfs_rq *cfs_rq, struct sched_entity *se);
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int __update_load_avg_cfs_rq(u64 now, int cpu, struct cfs_rq *cfs_rq);
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int update_rt_rq_load_avg(u64 now, struct rq *rq, int running);
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/*
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* When a task is dequeued, its estimated utilization should not be update if
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* its util_avg has not been updated at least once.
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* This flag is used to synchronize util_avg updates with util_est updates.
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* We map this information into the LSB bit of the utilization saved at
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* dequeue time (i.e. util_est.dequeued).
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*/
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#define UTIL_AVG_UNCHANGED 0x1
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static inline void cfs_se_util_change(struct sched_avg *avg)
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{
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unsigned int enqueued;
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if (!sched_feat(UTIL_EST))
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return;
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/* Avoid store if the flag has been already set */
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enqueued = avg->util_est.enqueued;
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if (!(enqueued & UTIL_AVG_UNCHANGED))
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return;
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/* Reset flag to report util_avg has been updated */
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enqueued &= ~UTIL_AVG_UNCHANGED;
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WRITE_ONCE(avg->util_est.enqueued, enqueued);
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}
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#else
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static inline int
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update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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{
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return 0;
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}
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static inline int
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update_rt_rq_load_avg(u64 now, struct rq *rq, int running)
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{
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return 0;
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}
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#endif
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