Commit 34886c8b authored by Steven Rostedt's avatar Steven Rostedt
Browse files

tracing: add average time in function to function profiler 



Show the average time in the function (Time / Hit)

  Function                               Hit    Time            Avg
  --------                               ---    ----            ---
  mwait_idle                              51    140326.6 us     2751.503 us
  smp_apic_timer_interrupt                47    3517.735 us     74.845 us
  schedule                                10    2738.754 us     273.875 us
  __schedule                              10    2732.857 us     273.285 us
  hrtimer_interrupt                       47    1896.104 us     40.342 us
  irq_exit                                56    1711.833 us     30.568 us
  __run_hrtimer                           47    1315.589 us     27.991 us
  tick_sched_timer                        47    1138.690 us     24.227 us
  do_softirq                              56    1116.829 us     19.943 us
  __do_softirq                            56    1066.932 us     19.052 us
  do_IRQ                                   9    926.153 us      102.905 us

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
parent 318e0a73

kernel/trace/ftrace.c

+14 −7
Original line number Diff line number Diff line
@@ -347,8 +347,10 @@ static int function_stat_cmp(void *p1, void *p2) 
static int function_stat_headers(struct seq_file *m)

{

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	seq_printf(m, "  Function                               Hit    Time\n"

		      "  --------                               ---    ----\n");

	seq_printf(m, "  Function                               "

		   "Hit    Time            Avg\n"

		      "  --------                               "

		   "---    ----            ---\n");

#else

	seq_printf(m, "  Function                               Hit\n"

		      "  --------                               ---\n");
@@ -361,12 +363,9 @@ static int function_stat_show(struct seq_file *m, void *v) 
	struct ftrace_profile *rec = v;

	char str[KSYM_SYMBOL_LEN];

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	static struct trace_seq s;

	static DEFINE_MUTEX(mutex);



	mutex_lock(&mutex);

	trace_seq_init(&s);

	trace_print_graph_duration(rec->time, &s);

	static struct trace_seq s;

	unsigned long long avg;

#endif



	kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
@@ -374,6 +373,14 @@ static int function_stat_show(struct seq_file *m, void *v) 


#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	seq_printf(m, "    ");

	avg = rec->time;

	do_div(avg, rec->counter);



	mutex_lock(&mutex);

	trace_seq_init(&s);

	trace_print_graph_duration(rec->time, &s);

	trace_seq_puts(&s, "    ");

	trace_print_graph_duration(avg, &s);

	trace_print_seq(m, &s);

	mutex_unlock(&mutex);

#endif

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