* [PATCH] sched/debug: Add new tracepoints to track util_est
@ 2020-05-27 16:39 vincent.donnefort
2020-06-03 12:04 ` Valentin Schneider
2020-06-16 12:21 ` [tip: sched/core] " tip-bot2 for Vincent Donnefort
0 siblings, 2 replies; 4+ messages in thread
From: vincent.donnefort @ 2020-05-27 16:39 UTC (permalink / raw)
To: mingo, peterz, vincent.guittot
Cc: linux-kernel, patrick.bellasi, dietmar.eggemann,
valentin.schneider, qais.yousef, Vincent Donnefort
From: Vincent Donnefort <vincent.donnefort@arm.com>
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>
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ed168b0..04f9a4c 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -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 */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9228236..ecff02b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -35,6 +35,8 @@ 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);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 174d2df..cfc0e06 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -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)
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] sched/debug: Add new tracepoints to track util_est
2020-05-27 16:39 [PATCH] sched/debug: Add new tracepoints to track util_est vincent.donnefort
@ 2020-06-03 12:04 ` Valentin Schneider
2020-06-03 12:15 ` Peter Zijlstra
2020-06-16 12:21 ` [tip: sched/core] " tip-bot2 for Vincent Donnefort
1 sibling, 1 reply; 4+ messages in thread
From: Valentin Schneider @ 2020-06-03 12:04 UTC (permalink / raw)
To: vincent.donnefort
Cc: mingo, peterz, vincent.guittot, linux-kernel, patrick.bellasi,
dietmar.eggemann, qais.yousef
On 27/05/20 17:39, vincent.donnefort@arm.com wrote:
> From: Vincent Donnefort <vincent.donnefort@arm.com>
>
> 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>
>
To put it more bluntly, we can't really do task placement / load tracking
testing if util_est is enabled (which reminds me we may want to get rid of
the SCHED_FEAT at some point, it's been default on since ~v4.17), since
there can be noticeable gaps between util_avg and util_est.
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] sched/debug: Add new tracepoints to track util_est
2020-06-03 12:04 ` Valentin Schneider
@ 2020-06-03 12:15 ` Peter Zijlstra
0 siblings, 0 replies; 4+ messages in thread
From: Peter Zijlstra @ 2020-06-03 12:15 UTC (permalink / raw)
To: Valentin Schneider
Cc: vincent.donnefort, mingo, vincent.guittot, linux-kernel,
patrick.bellasi, dietmar.eggemann, qais.yousef
On Wed, Jun 03, 2020 at 01:04:26PM +0100, Valentin Schneider wrote:
>
> On 27/05/20 17:39, vincent.donnefort@arm.com wrote:
> > From: Vincent Donnefort <vincent.donnefort@arm.com>
> >
> > 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>
> >
>
> To put it more bluntly, we can't really do task placement / load tracking
> testing if util_est is enabled (which reminds me we may want to get rid of
> the SCHED_FEAT at some point, it's been default on since ~v4.17), since
> there can be noticeable gaps between util_avg and util_est.
>
> Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip: sched/core] sched/debug: Add new tracepoints to track util_est
2020-05-27 16:39 [PATCH] sched/debug: Add new tracepoints to track util_est vincent.donnefort
2020-06-03 12:04 ` Valentin Schneider
@ 2020-06-16 12:21 ` tip-bot2 for Vincent Donnefort
1 sibling, 0 replies; 4+ messages in thread
From: tip-bot2 for Vincent Donnefort @ 2020-06-16 12:21 UTC (permalink / raw)
To: linux-tip-commits
Cc: Vincent Donnefort, Peter Zijlstra (Intel), Valentin Schneider, x86, LKML
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 4581bea8b4ec4de353369775dfef921191e393b3
Gitweb: https://git.kernel.org/tip/4581bea8b4ec4de353369775dfef921191e393b3
Author: Vincent Donnefort <vincent.donnefort@arm.com>
AuthorDate: Wed, 27 May 2020 17:39:14 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 15 Jun 2020 14:10:02 +02:00
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
---
include/trace/events/sched.h | 8 ++++++++
kernel/sched/core.c | 2 ++
kernel/sched/fair.c | 6 ++++++
3 files changed, 16 insertions(+)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ed168b0..04f9a4c 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -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 */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9c89b0e..0208b71 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -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);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 69da576..a785a9b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -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)
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2020-05-27 16:39 [PATCH] sched/debug: Add new tracepoints to track util_est vincent.donnefort
2020-06-03 12:04 ` Valentin Schneider
2020-06-03 12:15 ` Peter Zijlstra
2020-06-16 12:21 ` [tip: sched/core] " tip-bot2 for Vincent Donnefort
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