Messages in this thread Patch in this message | | | From | Junwen Wu <> | Subject | [PATCH v1] softirq: Add tracepoint for tasklet_entry/exit | Date | Sun, 8 May 2022 16:06:24 +0000 |
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Usually softirq handler is pre-defined,only tasklet can be register by driver.We expand tracepoint for tasklet_entry/exit to trace tasklet handler.
Signed-off-by: Junwen Wu <wudaemon@163.com> --- include/trace/events/irq.h | 32 ++++++++++++++++++++++++++++++++ kernel/softirq.c | 4 ++++ 2 files changed, 36 insertions(+)
diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h index eeceafaaea4c..d3e922dcd475 100644 --- a/include/trace/events/irq.h +++ b/include/trace/events/irq.h @@ -160,6 +160,38 @@ DEFINE_EVENT(softirq, softirq_raise, TP_ARGS(vec_nr) ); +TRACE_EVENT(tasklet_entry, + + 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) +); +TRACE_EVENT(tasklet_exit, + + 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) +); #endif /* _TRACE_IRQ_H */ /* This part must be outside protection */ diff --git a/kernel/softirq.c b/kernel/softirq.c index 41f470929e99..b3bce2b3b655 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -780,10 +780,14 @@ static void tasklet_action_common(struct softirq_action *a, if (tasklet_trylock(t)) { if (!atomic_read(&t->count)) { if (tasklet_clear_sched(t)) { + trace_tasklet_entry(t->use_callback ? (void *)t->callback + : (void *)t->func); if (t->use_callback) t->callback(t); else t->func(t->data); + trace_tasklet_exit(t->use_callback ? (void *)t->callback + : (void *)t->func); } tasklet_unlock(t); continue; -- 2.25.1
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