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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>
This commit is contained in:
Steven Rostedt 2009-03-25 21:00:47 -04:00
parent 318e0a73c9
commit 34886c8bc5
1 changed files with 14 additions and 7 deletions
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21
kernel/trace/ftrace.c
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@ -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