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sched/debug: Add new tracepoint to track compute energy computation

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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) <qyousef@layalina.io>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230916232955.2099394-4-qyousef@layalina.io
This commit is contained in:
Qais Yousef 2023-09-17 00:29:55 +01:00 committed by Ingo Molnar
parent 23c9519def
commit 15874a3d27
3 changed files with 12 additions and 1 deletions
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5
include/trace/events/sched.h
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@ -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 */

1
kernel/sched/core.c
View File

@ -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);

7
kernel/sched/fair.c
View File

@ -7600,11 +7600,16 @@ 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;
}
/*