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ANDROID: trace: Add trace points for tasklet entry/exit

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Tasklets are supposed to finish their work quickly and
should not block the current running process, but it is not
guaranteed that. Currently softirq_entry/exit can be used to
know total tasklets execution time, but not helpful to track
individual tasklet's execution time. With that we can't find
any culprit tasklet function, which is taking more time.

Add {hi}-tasklet_entry/exit trace point support to track
individual tasklet execution.

Bug: 168521633
Change-Id: I3496d15f64d020916774e673ccb4a8116ea2f2c9
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
[elavila: Port to mainline]
Signed-off-by: J. Avila <elavila@google.com>
This commit is contained in:
Lingutla Chandrasekhar
2019-03-01 17:17:09 +05:30
committed by J. Avila
parent 1bcefd3883
commit 9889f08de4
2 changed files with 52 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
include/trace/events/irq.h
View File

@@ -160,6 +160,51 @@ DEFINE_EVENT(softirq, softirq_raise,
TP_ARGS(vec_nr)
);
DECLARE_EVENT_CLASS(tasklet,
TP_PROTO(void *func),
TP_ARGS(func),
TP_STRUCT__entry(
__field( void *, func)
),
TP_fast_assign(
__entry->func = func;
),
TP_printk("function=%ps", __entry->func)
);
DEFINE_EVENT(tasklet, tasklet_entry,
TP_PROTO(void *func),
TP_ARGS(func)
);
DEFINE_EVENT(tasklet, tasklet_exit,
TP_PROTO(void *func),
TP_ARGS(func)
);
DEFINE_EVENT(tasklet, tasklet_hi_entry,
TP_PROTO(void *func),
TP_ARGS(func)
);
DEFINE_EVENT(tasklet, tasklet_hi_exit,
TP_PROTO(void *func),
TP_ARGS(func)
);
#endif /* _TRACE_IRQ_H */
/* This part must be outside protection */

9
kernel/softirq.c
View File

@@ -559,10 +559,15 @@ static void tasklet_action_common(struct softirq_action *a,
if (!test_and_clear_bit(TASKLET_STATE_SCHED,
&t->state))
BUG();
if (t->use_callback)
if (t->use_callback) {
trace_tasklet_entry(t->callback);
t->callback(t);
else
trace_tasklet_exit(t->callback);
} else {
trace_tasklet_entry(t->func);
t->func(t->data);
trace_tasklet_exit(t->func);
}
tasklet_unlock(t);
continue;
}