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sched/pelt: Relax the sync of load_sum with load_avg
Similarly to util_avg and util_sum, don't sync load_sum with the low bound of load_avg but only ensure that load_sum stays in the correct range. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Link: https://lkml.kernel.org/r/20220111134659.24961-5-vincent.guittot@linaro.org
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95246d1ec8
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1 changed files with 22 additions and 14 deletions
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@ -3028,9 +3028,11 @@ enqueue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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static inline void
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dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
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{
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u32 divider = get_pelt_divider(&se->avg);
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sub_positive(&cfs_rq->avg.load_avg, se->avg.load_avg);
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cfs_rq->avg.load_sum = cfs_rq->avg.load_avg * divider;
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sub_positive(&cfs_rq->avg.load_sum, se_weight(se) * se->avg.load_sum);
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/* See update_cfs_rq_load_avg() */
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cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
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cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
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}
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#else
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static inline void
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@ -3513,9 +3515,10 @@ update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cf
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static inline void
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update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
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{
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long delta, running_sum, runnable_sum = gcfs_rq->prop_runnable_sum;
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long delta_avg, running_sum, runnable_sum = gcfs_rq->prop_runnable_sum;
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unsigned long load_avg;
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u64 load_sum = 0;
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s64 delta_sum;
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u32 divider;
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if (!runnable_sum)
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@ -3542,7 +3545,7 @@ update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
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* assuming all tasks are equally runnable.
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*/
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if (scale_load_down(gcfs_rq->load.weight)) {
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load_sum = div_s64(gcfs_rq->avg.load_sum,
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load_sum = div_u64(gcfs_rq->avg.load_sum,
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scale_load_down(gcfs_rq->load.weight));
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}
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@ -3559,19 +3562,22 @@ update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
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running_sum = se->avg.util_sum >> SCHED_CAPACITY_SHIFT;
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runnable_sum = max(runnable_sum, running_sum);
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load_sum = (s64)se_weight(se) * runnable_sum;
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load_avg = div_s64(load_sum, divider);
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load_sum = se_weight(se) * runnable_sum;
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load_avg = div_u64(load_sum, divider);
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se->avg.load_sum = runnable_sum;
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delta = load_avg - se->avg.load_avg;
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if (!delta)
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delta_avg = load_avg - se->avg.load_avg;
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if (!delta_avg)
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return;
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se->avg.load_avg = load_avg;
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delta_sum = load_sum - (s64)se_weight(se) * se->avg.load_sum;
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add_positive(&cfs_rq->avg.load_avg, delta);
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cfs_rq->avg.load_sum = cfs_rq->avg.load_avg * divider;
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se->avg.load_sum = runnable_sum;
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se->avg.load_avg = load_avg;
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add_positive(&cfs_rq->avg.load_avg, delta_avg);
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add_positive(&cfs_rq->avg.load_sum, delta_sum);
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/* See update_cfs_rq_load_avg() */
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cfs_rq->avg.load_sum = max_t(u32, cfs_rq->avg.load_sum,
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cfs_rq->avg.load_avg * PELT_MIN_DIVIDER);
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}
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static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum)
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@ -3687,7 +3693,9 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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r = removed_load;
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sub_positive(&sa->load_avg, r);
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sa->load_sum = sa->load_avg * divider;
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sub_positive(&sa->load_sum, r * divider);
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/* See sa->util_sum below */
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sa->load_sum = max_t(u32, sa->load_sum, sa->load_avg * PELT_MIN_DIVIDER);
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r = removed_util;
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sub_positive(&sa->util_avg, r);
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