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sched: Add ftrace events for entity load-tracking

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Adds ftrace events for key variables related to the entity
load-tracking to help debugging scheduler behaviour. Allows tracing
of load contribution and runqueue residency ratio for both entities
and runqueues as well as entity CPU usage ratio.

Signed-off-by: Morten Rasmussen <Morten.Rasmussen@arm.com>
This commit is contained in:
Morten Rasmussen
2012-09-14 14:38:15 +01:00
committed by Jon Medhurst
parent 1baaccf456
commit b9d3d56128
2 changed files with 132 additions and 0 deletions
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125
include/trace/events/sched.h
View File

@@ -430,6 +430,131 @@ TRACE_EVENT(sched_pi_setprio,
__entry->oldprio, __entry->newprio)
);
/*
* Tracepoint for showing tracked load contribution.
*/
TRACE_EVENT(sched_task_load_contrib,
TP_PROTO(struct task_struct *tsk, unsigned long load_contrib),
TP_ARGS(tsk, load_contrib),
TP_STRUCT__entry(
__array(char, comm, TASK_COMM_LEN)
__field(pid_t, pid)
__field(unsigned long, load_contrib)
),
TP_fast_assign(
memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
__entry->pid = tsk->pid;
__entry->load_contrib = load_contrib;
),
TP_printk("comm=%s pid=%d load_contrib=%lu",
__entry->comm, __entry->pid,
__entry->load_contrib)
);
/*
* Tracepoint for showing tracked task runnable ratio [0..1023].
*/
TRACE_EVENT(sched_task_runnable_ratio,
TP_PROTO(struct task_struct *tsk, unsigned long ratio),
TP_ARGS(tsk, ratio),
TP_STRUCT__entry(
__array(char, comm, TASK_COMM_LEN)
__field(pid_t, pid)
__field(unsigned long, ratio)
),
TP_fast_assign(
memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
__entry->pid = tsk->pid;
__entry->ratio = ratio;
),
TP_printk("comm=%s pid=%d ratio=%lu",
__entry->comm, __entry->pid,
__entry->ratio)
);
/*
* Tracepoint for showing tracked rq runnable ratio [0..1023].
*/
TRACE_EVENT(sched_rq_runnable_ratio,
TP_PROTO(int cpu, unsigned long ratio),
TP_ARGS(cpu, ratio),
TP_STRUCT__entry(
__field(int, cpu)
__field(unsigned long, ratio)
),
TP_fast_assign(
__entry->cpu = cpu;
__entry->ratio = ratio;
),
TP_printk("cpu=%d ratio=%lu",
__entry->cpu,
__entry->ratio)
);
/*
* Tracepoint for showing tracked rq runnable load.
*/
TRACE_EVENT(sched_rq_runnable_load,
TP_PROTO(int cpu, u64 load),
TP_ARGS(cpu, load),
TP_STRUCT__entry(
__field(int, cpu)
__field(u64, load)
),
TP_fast_assign(
__entry->cpu = cpu;
__entry->load = load;
),
TP_printk("cpu=%d load=%llu",
__entry->cpu,
__entry->load)
);
/*
* Tracepoint for showing tracked task cpu usage ratio [0..1023].
*/
TRACE_EVENT(sched_task_usage_ratio,
TP_PROTO(struct task_struct *tsk, unsigned long ratio),
TP_ARGS(tsk, ratio),
TP_STRUCT__entry(
__array(char, comm, TASK_COMM_LEN)
__field(pid_t, pid)
__field(unsigned long, ratio)
),
TP_fast_assign(
memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
__entry->pid = tsk->pid;
__entry->ratio = ratio;
),
TP_printk("comm=%s pid=%d ratio=%lu",
__entry->comm, __entry->pid,
__entry->ratio)
);
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */

7
kernel/sched/fair.c
View File

@@ -1428,9 +1428,11 @@ static inline void __update_task_entity_contrib(struct sched_entity *se)
contrib = se->avg.runnable_avg_sum * scale_load_down(se->load.weight);
contrib /= (se->avg.runnable_avg_period + 1);
se->avg.load_avg_contrib = scale_load(contrib);
trace_sched_task_load_contrib(task_of(se), se->avg.load_avg_contrib);
contrib = se->avg.runnable_avg_sum * scale_load_down(NICE_0_LOAD);
contrib /= (se->avg.runnable_avg_period + 1);
se->avg.load_avg_ratio = scale_load(contrib);
trace_sched_task_runnable_ratio(task_of(se), se->avg.load_avg_ratio);
}
/* Compute the current contribution to load_avg by se, return any delta */
@@ -1521,9 +1523,14 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
{
u32 contrib;
__update_entity_runnable_avg(rq->clock_task, &rq->avg, runnable,
runnable);
__update_tg_runnable_avg(&rq->avg, &rq->cfs);
contrib = rq->avg.runnable_avg_sum * scale_load_down(1024);
contrib /= (rq->avg.runnable_avg_period + 1);
trace_sched_rq_runnable_ratio(cpu_of(rq), scale_load(contrib));
trace_sched_rq_runnable_load(cpu_of(rq), rq->cfs.runnable_load_avg);
}
/* Add the load generated by se into cfs_rq's child load-average */