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  3. [PATCH v2 0/3] Fix a couple of corner cases in feec() when using uclamp_max
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[PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation

Qais Yousef posted 3 patches 2 years, 7 months ago
There is a newer version of this series
[PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation
Posted by Qais Yousef 2 years, 7 months ago 
It was useful to track feec() placement decision and debug the spare
capacity and optimization issues vs uclamp_max.

Signed-off-by: Qais Yousef <qyousef@layalina.io>
---
 include/trace/events/sched.h | 4 ++++
 kernel/sched/core.c          | 1 +
 kernel/sched/fair.c          | 7 ++++++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index fbb99a61f714..20cc884f72ff 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp,
 	TP_PROTO(struct rq *rq, int change),
 	TP_ARGS(rq, change));
 
+DECLARE_TRACE(sched_compute_energy_tp,
+	TP_PROTO(struct task_struct *p, int dst_cpu, unsigned long energy),
+	TP_ARGS(p, dst_cpu, energy));
+
 #endif /* _TRACE_SCHED_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4580fe3e1d0c..5f6dde9b892b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -110,6 +110,7 @@ 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);
 EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
+EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
 
 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
 
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a8c3d92ff3f6..801e903c4307 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7295,11 +7295,16 @@ compute_energy(struct energy_env *eenv, struct perf_domain *pd,
 {
 	unsigned long max_util = eenv_pd_max_util(eenv, pd_cpus, p, dst_cpu);
 	unsigned long busy_time = eenv->pd_busy_time;
+	unsigned long energy;
 
 	if (dst_cpu >= 0)
 		busy_time = min(eenv->pd_cap, busy_time + eenv->task_busy_time);
 
-	return em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
+	energy = em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
+
+	trace_sched_compute_energy_tp(p, dst_cpu, energy);
+
+	return energy;
 }
 
 /*
-- 
2.25.1
Re: [PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation
Posted by Lukasz Luba 2 years, 6 months ago 
Hi Qais,

On 2/5/23 22:43, Qais Yousef wrote:
> It was useful to track feec() placement decision and debug the spare
> capacity and optimization issues vs uclamp_max.
> 
> Signed-off-by: Qais Yousef <qyousef@layalina.io>
> ---
>   include/trace/events/sched.h | 4 ++++
>   kernel/sched/core.c          | 1 +
>   kernel/sched/fair.c          | 7 ++++++-
>   3 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index fbb99a61f714..20cc884f72ff 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp,
>   	TP_PROTO(struct rq *rq, int change),
>   	TP_ARGS(rq, change));
>   
> +DECLARE_TRACE(sched_compute_energy_tp,
> +	TP_PROTO(struct task_struct *p, int dst_cpu, unsigned long energy),
> +	TP_ARGS(p, dst_cpu, energy));
> +
>   #endif /* _TRACE_SCHED_H */
>   
>   /* This part must be outside protection */
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 4580fe3e1d0c..5f6dde9b892b 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -110,6 +110,7 @@ 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);
>   EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
>   
>   DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
>   
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index a8c3d92ff3f6..801e903c4307 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7295,11 +7295,16 @@ compute_energy(struct energy_env *eenv, struct perf_domain *pd,
>   {
>   	unsigned long max_util = eenv_pd_max_util(eenv, pd_cpus, p, dst_cpu);
>   	unsigned long busy_time = eenv->pd_busy_time;
> +	unsigned long energy;
>   
>   	if (dst_cpu >= 0)
>   		busy_time = min(eenv->pd_cap, busy_time + eenv->task_busy_time);
>   
> -	return em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
> +	energy = em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
> +
> +	trace_sched_compute_energy_tp(p, dst_cpu, energy);

Could we also dump the max_util and busy_time?

> +
> +	return energy;
>   }
>   
>   /*


IMO this one is really helpful. I hope it won't be an issue if we can
have it in this code path.

Regards,
Lukasz
Re: [PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation
Posted by Qais Yousef 2 years, 6 months ago 
On 02/20/23 11:22, Lukasz Luba wrote:
> Hi Qais,
> 
> On 2/5/23 22:43, Qais Yousef wrote:
> > It was useful to track feec() placement decision and debug the spare
> > capacity and optimization issues vs uclamp_max.
> > 
> > Signed-off-by: Qais Yousef <qyousef@layalina.io>
> > ---
> >   include/trace/events/sched.h | 4 ++++
> >   kernel/sched/core.c          | 1 +
> >   kernel/sched/fair.c          | 7 ++++++-
> >   3 files changed, 11 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> > index fbb99a61f714..20cc884f72ff 100644
> > --- a/include/trace/events/sched.h
> > +++ b/include/trace/events/sched.h
> > @@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp,
> >   	TP_PROTO(struct rq *rq, int change),
> >   	TP_ARGS(rq, change));
> > +DECLARE_TRACE(sched_compute_energy_tp,
> > +	TP_PROTO(struct task_struct *p, int dst_cpu, unsigned long energy),
> > +	TP_ARGS(p, dst_cpu, energy));
> > +
> >   #endif /* _TRACE_SCHED_H */
> >   /* This part must be outside protection */
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 4580fe3e1d0c..5f6dde9b892b 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -110,6 +110,7 @@ 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);
> >   EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
> > +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
> >   DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index a8c3d92ff3f6..801e903c4307 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -7295,11 +7295,16 @@ compute_energy(struct energy_env *eenv, struct perf_domain *pd,
> >   {
> >   	unsigned long max_util = eenv_pd_max_util(eenv, pd_cpus, p, dst_cpu);
> >   	unsigned long busy_time = eenv->pd_busy_time;
> > +	unsigned long energy;
> >   	if (dst_cpu >= 0)
> >   		busy_time = min(eenv->pd_cap, busy_time + eenv->task_busy_time);
> > -	return em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
> > +	energy = em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
> > +
> > +	trace_sched_compute_energy_tp(p, dst_cpu, energy);
> 
> Could we also dump the max_util and busy_time?

We certainly can :)


Cheers

--
Qais Yousef

> 
> > +
> > +	return energy;
> >   }
> >   /*
> 
> 
> IMO this one is really helpful. I hope it won't be an issue if we can
> have it in this code path.
> 
> Regards,
> Lukasz
Re: [PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation
Posted by Lukasz Luba 2 years, 6 months ago 

On 2/21/23 12:08, Qais Yousef wrote:
> On 02/20/23 11:22, Lukasz Luba wrote:
>> Hi Qais,
>>
>> On 2/5/23 22:43, Qais Yousef wrote:
>>> It was useful to track feec() placement decision and debug the spare
>>> capacity and optimization issues vs uclamp_max.
>>>
>>> Signed-off-by: Qais Yousef <qyousef@layalina.io>
>>> ---
>>>    include/trace/events/sched.h | 4 ++++
>>>    kernel/sched/core.c          | 1 +
>>>    kernel/sched/fair.c          | 7 ++++++-
>>>    3 files changed, 11 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
>>> index fbb99a61f714..20cc884f72ff 100644
>>> --- a/include/trace/events/sched.h
>>> +++ b/include/trace/events/sched.h
>>> @@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp,
>>>    	TP_PROTO(struct rq *rq, int change),
>>>    	TP_ARGS(rq, change));
>>> +DECLARE_TRACE(sched_compute_energy_tp,
>>> +	TP_PROTO(struct task_struct *p, int dst_cpu, unsigned long energy),
>>> +	TP_ARGS(p, dst_cpu, energy));
>>> +
>>>    #endif /* _TRACE_SCHED_H */
>>>    /* This part must be outside protection */
>>> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
>>> index 4580fe3e1d0c..5f6dde9b892b 100644
>>> --- a/kernel/sched/core.c
>>> +++ b/kernel/sched/core.c
>>> @@ -110,6 +110,7 @@ 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);
>>>    EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
>>> +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
>>>    DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
>>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>>> index a8c3d92ff3f6..801e903c4307 100644
>>> --- a/kernel/sched/fair.c
>>> +++ b/kernel/sched/fair.c
>>> @@ -7295,11 +7295,16 @@ compute_energy(struct energy_env *eenv, struct perf_domain *pd,
>>>    {
>>>    	unsigned long max_util = eenv_pd_max_util(eenv, pd_cpus, p, dst_cpu);
>>>    	unsigned long busy_time = eenv->pd_busy_time;
>>> +	unsigned long energy;
>>>    	if (dst_cpu >= 0)
>>>    		busy_time = min(eenv->pd_cap, busy_time + eenv->task_busy_time);
>>> -	return em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
>>> +	energy = em_cpu_energy(pd->em_pd, max_util, busy_time, eenv->cpu_cap);
>>> +
>>> +	trace_sched_compute_energy_tp(p, dst_cpu, energy);
>>
>> Could we also dump the max_util and busy_time?
> 
> We certainly can :)

Great, thanks!

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