Messages in this thread | | | Date | Mon, 20 Feb 2023 11:22:45 +0000 | Subject | Re: [PATCH v2 3/3] sched/tp: Add new tracepoint to track compute energy computation | From | Lukasz Luba <> |
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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
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