sched/fair: Do not call cpufreq hook unless util changed
There's no reason to call the cpufreq hook if the root cfs_rq utilization has not been modified. Signed-off-by: Steve Muckle <smuckle@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Juri Lelli <Juri.Lelli@arm.com> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Patrick Bellasi <patrick.bellasi@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: http://lkml.kernel.org/r/1458606068-7476-2-git-send-email-smuckle@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -2879,20 +2879,21 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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{
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struct sched_avg *sa = &cfs_rq->avg;
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struct rq *rq = rq_of(cfs_rq);
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int decayed, removed = 0;
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int decayed, removed_load = 0, removed_util = 0;
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int cpu = cpu_of(rq);
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if (atomic_long_read(&cfs_rq->removed_load_avg)) {
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s64 r = atomic_long_xchg(&cfs_rq->removed_load_avg, 0);
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sa->load_avg = max_t(long, sa->load_avg - r, 0);
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sa->load_sum = max_t(s64, sa->load_sum - r * LOAD_AVG_MAX, 0);
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removed = 1;
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removed_load = 1;
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}
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if (atomic_long_read(&cfs_rq->removed_util_avg)) {
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long r = atomic_long_xchg(&cfs_rq->removed_util_avg, 0);
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sa->util_avg = max_t(long, sa->util_avg - r, 0);
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sa->util_sum = max_t(s32, sa->util_sum - r * LOAD_AVG_MAX, 0);
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removed_util = 1;
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}
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decayed = __update_load_avg(now, cpu, sa,
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@ -2903,7 +2904,8 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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cfs_rq->load_last_update_time_copy = sa->last_update_time;
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#endif
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if (cpu == smp_processor_id() && &rq->cfs == cfs_rq) {
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if (cpu == smp_processor_id() && &rq->cfs == cfs_rq &&
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(decayed || removed_util)) {
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unsigned long max = rq->cpu_capacity_orig;
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/*
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@ -2926,7 +2928,7 @@ static inline int update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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min(sa->util_avg, max), max);
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}
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return decayed || removed;
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return decayed || removed_load;
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}
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/* Update task and its cfs_rq load average */
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