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Date: Tue, 18 Feb 2020 14:54:40 +0000
From: Valentin Schneider <valentin.schneider@....com>
To: Vincent Guittot <vincent.guittot@...aro.org>, mingo@...hat.com,
peterz@...radead.org, juri.lelli@...hat.com,
dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
mgorman@...e.de, linux-kernel@...r.kernel.org
Cc: pauld@...hat.com, parth@...ux.ibm.com, hdanton@...a.com
Subject: Re: [PATCH v2 4/5] sched/pelt: Add a new runnable average signal
On 2/14/20 3:27 PM, Vincent Guittot wrote:
> @@ -532,8 +535,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
> cfs_rq->removed.load_avg);
> SEQ_printf(m, " .%-30s: %ld\n", "removed.util_avg",
> cfs_rq->removed.util_avg);
> - SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_sum",
> - cfs_rq->removed.runnable_sum);
Shouldn't that have been part of patch 3?
> + SEQ_printf(m, " .%-30s: %ld\n", "removed.runnable_avg",
> + cfs_rq->removed.runnable_avg);
> #ifdef CONFIG_FAIR_GROUP_SCHED
> SEQ_printf(m, " .%-30s: %lu\n", "tg_load_avg_contrib",
> cfs_rq->tg_load_avg_contrib);
> @@ -3278,6 +3280,32 @@ update_tg_cfs_util(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq
> cfs_rq->avg.util_sum = cfs_rq->avg.util_avg * LOAD_AVG_MAX;
> }
>
> +static inline void
> +update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
> +{
> + long delta = gcfs_rq->avg.runnable_avg - se->avg.runnable_avg;
> +
> + /* Nothing to update */
> + if (!delta)
> + return;
> +
> + /*
> + * The relation between sum and avg is:
> + *
> + * LOAD_AVG_MAX - 1024 + sa->period_contrib
> + *
> + * however, the PELT windows are not aligned between grq and gse.
> + */
> +
> + /* Set new sched_entity's runnable */
> + se->avg.runnable_avg = gcfs_rq->avg.runnable_avg;
> + se->avg.runnable_sum = se->avg.runnable_avg * LOAD_AVG_MAX;
> +
> + /* Update parent cfs_rq runnable */
> + add_positive(&cfs_rq->avg.runnable_avg, delta);
> + cfs_rq->avg.runnable_sum = cfs_rq->avg.runnable_avg * LOAD_AVG_MAX;
> +}
> +
Humph, that's an exact copy of update_tg_cfs_util(). FWIW the following
eldritch horror compiles...
---
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 99249a2484b4..be796532a2d3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3254,57 +3254,34 @@ void set_task_rq_fair(struct sched_entity *se,
*
*/
-static inline void
-update_tg_cfs_util(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
-{
- long delta = gcfs_rq->avg.util_avg - se->avg.util_avg;
-
- /* Nothing to update */
- if (!delta)
- return;
-
- /*
- * The relation between sum and avg is:
- *
- * LOAD_AVG_MAX - 1024 + sa->period_contrib
- *
- * however, the PELT windows are not aligned between grq and gse.
- */
-
- /* Set new sched_entity's utilization */
- se->avg.util_avg = gcfs_rq->avg.util_avg;
- se->avg.util_sum = se->avg.util_avg * LOAD_AVG_MAX;
-
- /* Update parent cfs_rq utilization */
- add_positive(&cfs_rq->avg.util_avg, delta);
- cfs_rq->avg.util_sum = cfs_rq->avg.util_avg * LOAD_AVG_MAX;
-}
-
-static inline void
-update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
-{
- long delta = gcfs_rq->avg.runnable_avg - se->avg.runnable_avg;
-
- /* Nothing to update */
- if (!delta)
- return;
-
- /*
- * The relation between sum and avg is:
- *
- * LOAD_AVG_MAX - 1024 + sa->period_contrib
- *
- * however, the PELT windows are not aligned between grq and gse.
- */
-
- /* Set new sched_entity's runnable */
- se->avg.runnable_avg = gcfs_rq->avg.runnable_avg;
- se->avg.runnable_sum = se->avg.runnable_avg * LOAD_AVG_MAX;
+#define DECLARE_UPDATE_TG_CFS_SIGNAL(signal) \
+static inline void \
+update_tg_cfs_##signal(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq) \
+{ \
+ long delta = gcfs_rq->avg.signal##_avg - se->avg.signal##_avg; \
+ \
+ /* Nothing to update */ \
+ if (!delta) \
+ return; \
+ \
+ /* \
+ * The relation between sum and avg is: \
+ * \
+ * LOAD_AVG_MAX - 1024 + sa->period_contrib \
+ * \
+ * however, the PELT windows are not aligned between grq and gse. \
+ */ \
+ /* Set new sched_entity's runnable */ \
+ se->avg.signal##_avg = gcfs_rq->avg.signal##_avg; \
+ se->avg.signal##_sum = se->avg.signal##_avg * LOAD_AVG_MAX; \
+ \
+ /* Update parent cfs_rq signal## */ \
+ add_positive(&cfs_rq->avg.signal##_avg, delta); \
+ cfs_rq->avg.signal##_sum = cfs_rq->avg.signal##_avg * LOAD_AVG_MAX; \
+} \
- /* Update parent cfs_rq runnable */
- add_positive(&cfs_rq->avg.runnable_avg, delta);
- cfs_rq->avg.runnable_sum = cfs_rq->avg.runnable_avg * LOAD_AVG_MAX;
-}
+DECLARE_UPDATE_TG_CFS_SIGNAL(util);
+DECLARE_UPDATE_TG_CFS_SIGNAL(runnable);
static inline void
update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
---
> static inline void
> update_tg_cfs_load(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cfs_rq *gcfs_rq)
> {
> @@ -3358,6 +3386,7 @@ static inline int propagate_entity_load_avg(struct sched_entity *se)
> add_tg_cfs_propagate(cfs_rq, gcfs_rq->prop_runnable_sum);
>
> update_tg_cfs_util(cfs_rq, se, gcfs_rq);
> + update_tg_cfs_runnable(cfs_rq, se, gcfs_rq);
> update_tg_cfs_load(cfs_rq, se, gcfs_rq);
>
> trace_pelt_cfs_tp(cfs_rq);
> @@ -3439,7 +3468,7 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
> raw_spin_lock(&cfs_rq->removed.lock);
> swap(cfs_rq->removed.util_avg, removed_util);
> swap(cfs_rq->removed.load_avg, removed_load);
> - swap(cfs_rq->removed.runnable_sum, removed_runnable_sum);
Ditto on the stray from patch 3?
> + swap(cfs_rq->removed.runnable_avg, removed_runnable);
> cfs_rq->removed.nr = 0;
> raw_spin_unlock(&cfs_rq->removed.lock);
>
> @@ -3451,7 +3480,16 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
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