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sched/debug: Add new tracepoints to track PELT at rq level

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The new tracepoints allow tracking PELT signals at rq level for all
scheduling classes + irq.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavankumar Kondeti <pkondeti@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Perret <quentin.perret@arm.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Uwe Kleine-Konig <u.kleine-koenig@pengutronix.de>
Link: https://lkml.kernel.org/r/20190604111459.2862-4-qais.yousef@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Qais Yousef 2019-06-04 12:14:56 +01:00 committed by Ingo Molnar
parent 3c93a0c04d
commit ba19f51fcb
3 changed files with 37 additions and 1 deletions
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23
include/trace/events/sched.h
View File

@ -594,6 +594,29 @@ TRACE_EVENT(sched_wake_idle_without_ipi,
TP_printk("cpu=%d", __entry->cpu)
);
/*
* Following tracepoints are not exported in tracefs and provide hooking
* mechanisms only for testing and debugging purposes.
*
* Postfixed with _tp to make them easily identifiable in the code.
*/
DECLARE_TRACE(pelt_cfs_tp,
TP_PROTO(struct cfs_rq *cfs_rq),
TP_ARGS(cfs_rq));
DECLARE_TRACE(pelt_rt_tp,
TP_PROTO(struct rq *rq),
TP_ARGS(rq));
DECLARE_TRACE(pelt_dl_tp,
TP_PROTO(struct rq *rq),
TP_ARGS(rq));
DECLARE_TRACE(pelt_irq_tp,
TP_PROTO(struct rq *rq),
TP_ARGS(rq));
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */

6
kernel/sched/fair.c
View File

@ -3347,6 +3347,8 @@ static inline int propagate_entity_load_avg(struct sched_entity *se)
update_tg_cfs_util(cfs_rq, se, gcfs_rq);
update_tg_cfs_runnable(cfs_rq, se, gcfs_rq);
trace_pelt_cfs_tp(cfs_rq);
return 1;
}
@ -3499,6 +3501,8 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
add_tg_cfs_propagate(cfs_rq, se->avg.load_sum);
cfs_rq_util_change(cfs_rq, flags);
trace_pelt_cfs_tp(cfs_rq);
}
/**
@ -3518,6 +3522,8 @@ static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
add_tg_cfs_propagate(cfs_rq, -se->avg.load_sum);
cfs_rq_util_change(cfs_rq, 0);
trace_pelt_cfs_tp(cfs_rq);
}
/*

9
kernel/sched/pelt.c
View File

@ -28,6 +28,8 @@
#include "sched.h"
#include "pelt.h"
#include <trace/events/sched.h>
/*
* Approximate:
* val * y^n, where y^32 ~= 0.5 (~1 scheduling period)
@ -292,6 +294,7 @@ int __update_load_avg_cfs_rq(u64 now, struct cfs_rq *cfs_rq)
cfs_rq->curr != NULL)) {
___update_load_avg(&cfs_rq->avg, 1, 1);
trace_pelt_cfs_tp(cfs_rq);
return 1;
}
@ -317,6 +320,7 @@ int update_rt_rq_load_avg(u64 now, struct rq *rq, int running)
running)) {
___update_load_avg(&rq->avg_rt, 1, 1);
trace_pelt_rt_tp(rq);
return 1;
}
@ -340,6 +344,7 @@ int update_dl_rq_load_avg(u64 now, struct rq *rq, int running)
running)) {
___update_load_avg(&rq->avg_dl, 1, 1);
trace_pelt_dl_tp(rq);
return 1;
}
@ -388,8 +393,10 @@ int update_irq_load_avg(struct rq *rq, u64 running)
1,
1);
if (ret)
if (ret) {
___update_load_avg(&rq->avg_irq, 1, 1);
trace_pelt_irq_tp(rq);
}
return ret;
}