Commit 51cf18c9 authored by Vincent Donnefort's avatar Vincent Donnefort Committed by Peter Zijlstra
Browse files

sched/debug: Add new tracepoint to track cpu_capacity 



rq->cpu_capacity is a key element in several scheduler parts, such as EAS
task placement and load balancing. Tracking this value enables testing
and/or debugging by a toolkit.

Signed-off-by: default avatarVincent Donnefort <vincent.donnefort@arm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1598605249-72651-1-git-send-email-vincent.donnefort@arm.com
parent 9abb8973

include/linux/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -2044,6 +2044,7 @@ const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq); 
const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq);



int sched_trace_rq_cpu(struct rq *rq);

int sched_trace_rq_cpu_capacity(struct rq *rq);

int sched_trace_rq_nr_running(struct rq *rq);



const struct cpumask *sched_trace_rd_span(struct root_domain *rd);

include/trace/events/sched.h

+4 −0
Original line number Diff line number Diff line
@@ -630,6 +630,10 @@ DECLARE_TRACE(pelt_se_tp, 
	TP_PROTO(struct sched_entity *se),

	TP_ARGS(se));



DECLARE_TRACE(sched_cpu_capacity_tp,

	TP_PROTO(struct rq *rq),

	TP_ARGS(rq));



DECLARE_TRACE(sched_overutilized_tp,

	TP_PROTO(struct root_domain *rd, bool overutilized),

	TP_ARGS(rd, overutilized));

kernel/sched/core.c

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_rt_tp); 
EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_dl_tp);

EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_irq_tp);

EXPORT_TRACEPOINT_SYMBOL_GPL(pelt_se_tp);

EXPORT_TRACEPOINT_SYMBOL_GPL(sched_cpu_capacity_tp);

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);

kernel/sched/fair.c

+14 −0
Original line number Diff line number Diff line
@@ -8108,6 +8108,8 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu) 
		capacity = 1;



	cpu_rq(cpu)->cpu_capacity = capacity;

	trace_sched_cpu_capacity_tp(cpu_rq(cpu));



	sdg->sgc->capacity = capacity;

	sdg->sgc->min_capacity = capacity;

	sdg->sgc->max_capacity = capacity;
@@ -11321,6 +11323,18 @@ int sched_trace_rq_cpu(struct rq *rq) 
}

EXPORT_SYMBOL_GPL(sched_trace_rq_cpu);



int sched_trace_rq_cpu_capacity(struct rq *rq)

{

	return rq ?

#ifdef CONFIG_SMP

		rq->cpu_capacity

#else

		SCHED_CAPACITY_SCALE

#endif

		: -1;

}

EXPORT_SYMBOL_GPL(sched_trace_rq_cpu_capacity);



const struct cpumask *sched_trace_rd_span(struct root_domain *rd)

{

#ifdef CONFIG_SMP

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