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sched: Extend ftrace event to record boost and reason code

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Add a new ftrace event to record changes to boost setting. Also extend
sched_task_load() ftrace event to record boost setting and reason code
passed to select_best_cpu(). This will be useful for debug purpose.

Change-Id: Idac72f86d954472abe9f88a8db184343b7730287
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
This commit is contained in:
Srivatsa Vaddagiri 2014-07-28 01:37:05 -07:00 committed by Steve Muckle
parent 232b0fe6f4
commit 1f12e6698c
2 changed files with 30 additions and 6 deletions
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30
include/trace/events/sched.h
View file

@ -116,9 +116,9 @@ TRACE_EVENT(sched_enq_deq_task,
TRACE_EVENT(sched_task_load,
TP_PROTO(struct task_struct *p),
TP_PROTO(struct task_struct *p, int boost, int reason),
TP_ARGS(p),
TP_ARGS(p, boost, reason),
TP_STRUCT__entry(
__array( char, comm, TASK_COMM_LEN )
@ -127,6 +127,8 @@ TRACE_EVENT(sched_task_load,
__field(unsigned int, sum_scaled )
__field(unsigned int, period )
__field(unsigned int, demand )
__field( int, boost )
__field( int, reason )
),
TP_fast_assign(
@ -136,11 +138,14 @@ TRACE_EVENT(sched_task_load,
__entry->sum_scaled = p->se.avg.runnable_avg_sum_scaled;
__entry->period = p->se.avg.runnable_avg_period;
__entry->demand = p->ravg.demand;
__entry->boost = boost;
__entry->reason = reason;
),
TP_printk("%d (%s): sum=%u, sum_scaled=%u, period=%u demand=%u",
TP_printk("%d (%s): sum=%u, sum_scaled=%u, period=%u demand=%u boost=%d reason=%d",
__entry->pid, __entry->comm, __entry->sum,
__entry->sum_scaled, __entry->period, __entry->demand)
__entry->sum_scaled, __entry->period, __entry->demand,
__entry->boost, __entry->reason)
);
TRACE_EVENT(sched_cpu_load,
@ -188,6 +193,23 @@ TRACE_EVENT(sched_cpu_load,
__entry->power_cost)
);
TRACE_EVENT(sched_set_boost,
TP_PROTO(int ref_count),
TP_ARGS(ref_count),
TP_STRUCT__entry(
__field(unsigned int, ref_count )
),
TP_fast_assign(
__entry->ref_count = ref_count;
),
TP_printk("ref_count=%d", __entry->ref_count)
);
#endif /* CONFIG_SCHED_HMP */
#if defined(CONFIG_SCHED_FREQ_INPUT) || defined(CONFIG_SCHED_HMP)

6
kernel/sched/fair.c
View file

@ -1485,6 +1485,7 @@ int sched_set_boost(int enable)
if (!old_refcount && boost_refcount)
boost_kick_cpus();
trace_sched_set_boost(boost_refcount);
spin_unlock_irqrestore(&boost_lock, flags);
return ret;
@ -1750,10 +1751,11 @@ static int select_best_cpu(struct task_struct *p, int target, int reason)
int cpu_cost, min_cost = INT_MAX;
u64 load, min_load = ULLONG_MAX, min_fallback_load = ULLONG_MAX;
int small_task = is_small_task(p);
int boost = sched_boost();
trace_sched_task_load(p);
trace_sched_task_load(p, boost, reason);
if (small_task && !sched_boost()) {
if (small_task && !boost) {
best_cpu = best_small_task_cpu(p);
goto done;
}