On 22/08/2023 00:45, 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 (Google) <[email protected]>
> ---
> include/trace/events/sched.h | 5 +++++
> kernel/sched/core.c | 1 +
> kernel/sched/fair.c | 7 ++++++-
> 3 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
> index fbb99a61f714..a13d5d06be9d 100644
> --- a/include/trace/events/sched.h
> +++ b/include/trace/events/sched.h
> @@ -735,6 +735,11 @@ 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,
> + unsigned long max_util, unsigned long busy_time),
> + TP_ARGS(p, dst_cpu, energy, max_util, busy_time));
> +
> #endif /* _TRACE_SCHED_H */
>
> /* This part must be outside protection */
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index efe3848978a0..36c60ad9966a 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -114,6 +114,7 @@ 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 e19a36e7b433..779c285203e3 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7604,11 +7604,16 @@ 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, max_util, busy_time);
> +
> + return energy;
> }
>
> /*
I will make sure that this gets integrated into our trace module in Lisa
https://github.com/ARM-software/lisa .
Reviewed-by: Dietmar Eggemann <[email protected]>