[v2,1/3] sched/tp: Add new tracepoint to track uclamp set from user-space
Commit Message
The user-space can set uclamp value for a given task. It impacts task
placement decisions made by the scheduler. This is very useful information
and helps to understand the system behavior or track improvements in
middleware and applications which start using uclamp mechanisms and report
better performance in tests.
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
---
include/trace/events/sched.h | 4 ++++
kernel/sched/core.c | 5 +++++
2 files changed, 9 insertions(+)
@@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp,
TP_PROTO(struct rq *rq, int change),
TP_ARGS(rq, change));
+DECLARE_TRACE(uclamp_update_tsk_tp,
+ TP_PROTO(struct task_struct *tsk, int uclamp_id, unsigned int value),
+ TP_ARGS(tsk, uclamp_id, value));
+
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */
@@ -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(uclamp_update_tsk_tp);
DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
@@ -1956,12 +1957,16 @@ static void __setscheduler_uclamp(struct task_struct *p,
attr->sched_util_min != -1) {
uclamp_se_set(&p->uclamp_req[UCLAMP_MIN],
attr->sched_util_min, true);
+ trace_uclamp_update_tsk_tp(p, UCLAMP_MIN,
+ attr->sched_util_min);
}
if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MAX &&
attr->sched_util_max != -1) {
uclamp_se_set(&p->uclamp_req[UCLAMP_MAX],
attr->sched_util_max, true);
+ trace_uclamp_update_tsk_tp(p, UCLAMP_MAX,
+ attr->sched_util_max);
}
}