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: Steven Rostedt <srostedt@redhat.com>
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1 changed files with 14 additions and 7 deletions
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@ -347,8 +347,10 @@ static int function_stat_cmp(void *p1, void *p2)
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static int function_stat_headers(struct seq_file *m)
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{
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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seq_printf(m, " Function Hit Time\n"
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" -------- --- ----\n");
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seq_printf(m, " Function "
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"Hit Time Avg\n"
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" -------- "
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"--- ---- ---\n");
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#else
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seq_printf(m, " Function Hit\n"
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" -------- ---\n");
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@ -361,12 +363,9 @@ static int function_stat_show(struct seq_file *m, void *v)
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struct ftrace_profile *rec = v;
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char str[KSYM_SYMBOL_LEN];
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static struct trace_seq s;
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static DEFINE_MUTEX(mutex);
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mutex_lock(&mutex);
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trace_seq_init(&s);
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trace_print_graph_duration(rec->time, &s);
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static struct trace_seq s;
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unsigned long long avg;
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#endif
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kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
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@ -374,6 +373,14 @@ static int function_stat_show(struct seq_file *m, void *v)
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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seq_printf(m, " ");
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avg = rec->time;
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do_div(avg, rec->counter);
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mutex_lock(&mutex);
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trace_seq_init(&s);
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trace_print_graph_duration(rec->time, &s);
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trace_seq_puts(&s, " ");
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trace_print_graph_duration(avg, &s);
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trace_print_seq(m, &s);
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mutex_unlock(&mutex);
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#endif
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