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sched/debug: Add new tracepoints to track util_est 

The util_est signals are key elements for EAS task placement and
frequency selection. Having tracepoints to track these signals enables
load-tracking and schedutil testing and/or debugging by a toolkit.

Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/1590597554-370150-1-git-send-email-vincent.donnefort@arm.com
This commit is contained in:
Vincent Donnefort 2020-05-27 17:39:14 +01:00 committed by Peter Zijlstra
parent 1ca2034ed7
commit 4581bea8b4
3 changed files with 16 additions and 0 deletions
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8
include/trace/events/sched.h
View File

@ -634,6 +634,14 @@ DECLARE_TRACE(sched_overutilized_tp,
TP_PROTO(struct root_domain *rd, bool overutilized),
TP_ARGS(rd, overutilized));
DECLARE_TRACE(sched_util_est_cfs_tp,
TP_PROTO(struct cfs_rq *cfs_rq),
TP_ARGS(cfs_rq));
DECLARE_TRACE(sched_util_est_se_tp,
TP_PROTO(struct sched_entity *se),
TP_ARGS(se));
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */

2
kernel/sched/core.c
View File

@ -36,6 +36,8 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_dl_tp);
EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_irq_tp);
EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_se_tp);
EXPORT_TRACEPOINT_SYMBOL_GPL(sched_overutilized_tp);
EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_cfs_tp);
EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_se_tp);
DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);

6
kernel/sched/fair.c
View File

@ -3922,6 +3922,8 @@ static inline void util_est_enqueue(struct cfs_rq *cfs_rq,
enqueued = cfs_rq->avg.util_est.enqueued;
enqueued += _task_util_est(p);
WRITE_ONCE(cfs_rq->avg.util_est.enqueued, enqueued);
trace_sched_util_est_cfs_tp(cfs_rq);
}
/*
@ -3952,6 +3954,8 @@ util_est_dequeue(struct cfs_rq *cfs_rq, struct task_struct *p, bool task_sleep)
ue.enqueued -= min_t(unsigned int, ue.enqueued, _task_util_est(p));
WRITE_ONCE(cfs_rq->avg.util_est.enqueued, ue.enqueued);
trace_sched_util_est_cfs_tp(cfs_rq);
/*
* Skip update of task's estimated utilization when the task has not
* yet completed an activation, e.g. being migrated.
@ -4017,6 +4021,8 @@ util_est_dequeue(struct cfs_rq *cfs_rq, struct task_struct *p, bool task_sleep)
ue.ewma >>= UTIL_EST_WEIGHT_SHIFT;
done:
WRITE_ONCE(p->se.avg.util_est, ue);
trace_sched_util_est_se_tp(&p->se);
}
static inline int task_fits_capacity(struct task_struct *p, long capacity)