diff options
| -rw-r--r-- | kernel/trace/ftrace.c | 27 | ||||
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 30 | ||||
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc | 18 |
3 files changed, 38 insertions, 37 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 6b0c25761ccb..fc88e0688daf 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -540,6 +540,7 @@ static int function_stat_show(struct seq_file *m, void *v) static struct trace_seq s; unsigned long long avg; unsigned long long stddev; + unsigned long long stddev_denom; #endif guard(mutex)(&ftrace_profile_lock); @@ -559,23 +560,19 @@ static int function_stat_show(struct seq_file *m, void *v) #ifdef CONFIG_FUNCTION_GRAPH_TRACER seq_puts(m, " "); - /* Sample standard deviation (s^2) */ - if (rec->counter <= 1) - stddev = 0; - else { - /* - * Apply Welford's method: - * s^2 = 1 / (n * (n-1)) * (n * \Sum (x_i)^2 - (\Sum x_i)^2) - */ + /* + * Variance formula: + * s^2 = 1 / (n * (n-1)) * (n * \Sum (x_i)^2 - (\Sum x_i)^2) + * Maybe Welford's method is better here? + * Divide only by 1000 for ns^2 -> us^2 conversion. + * trace_print_graph_duration will divide by 1000 again. + */ + stddev = 0; + stddev_denom = rec->counter * (rec->counter - 1) * 1000; + if (stddev_denom) { stddev = rec->counter * rec->time_squared - rec->time * rec->time; - - /* - * Divide only 1000 for ns^2 -> us^2 conversion. - * trace_print_graph_duration will divide 1000 again. - */ - stddev = div64_ul(stddev, - rec->counter * (rec->counter - 1) * 1000); + stddev = div64_ul(stddev, stddev_denom); } trace_seq_init(&s); diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 261163b00137..ad7419e24055 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -6724,27 +6724,27 @@ static int event_hist_trigger_parse(struct event_command *cmd_ops, if (existing_hist_update_only(glob, trigger_data, file)) goto out_free; - ret = event_trigger_register(cmd_ops, file, glob, trigger_data); - if (ret < 0) - goto out_free; + if (!get_named_trigger_data(trigger_data)) { - if (get_named_trigger_data(trigger_data)) - goto enable; + ret = create_actions(hist_data); + if (ret) + goto out_free; - ret = create_actions(hist_data); - if (ret) - goto out_unreg; + if (has_hist_vars(hist_data) || hist_data->n_var_refs) { + ret = save_hist_vars(hist_data); + if (ret) + goto out_free; + } - if (has_hist_vars(hist_data) || hist_data->n_var_refs) { - ret = save_hist_vars(hist_data); + ret = tracing_map_init(hist_data->map); if (ret) - goto out_unreg; + goto out_free; } - ret = tracing_map_init(hist_data->map); - if (ret) - goto out_unreg; -enable: + ret = event_trigger_register(cmd_ops, file, glob, trigger_data); + if (ret < 0) + goto out_free; + ret = hist_trigger_enable(trigger_data, file); if (ret) goto out_unreg; diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc index 449f9d8be746..73f6c6fcecab 100644 --- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc +++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_fprobe.tc @@ -10,12 +10,16 @@ PLACE=$FUNCTION_FORK PLACE2="kmem_cache_free" PLACE3="schedule_timeout" +# Some functions may have BPF programs attached, therefore +# count already enabled_functions before tests start +ocnt=`cat enabled_functions | wc -l` + echo "f:myevent1 $PLACE" >> dynamic_events # Make sure the event is attached and is the only one grep -q $PLACE enabled_functions cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 1 ]; then +if [ $cnt -ne $((ocnt + 1)) ]; then exit_fail fi @@ -23,7 +27,7 @@ echo "f:myevent2 $PLACE%return" >> dynamic_events # It should till be the only attached function cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 1 ]; then +if [ $cnt -ne $((ocnt + 1)) ]; then exit_fail fi @@ -32,7 +36,7 @@ echo "f:myevent3 $PLACE2" >> dynamic_events grep -q $PLACE2 enabled_functions cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 2 ]; then +if [ $cnt -ne $((ocnt + 2)) ]; then exit_fail fi @@ -49,7 +53,7 @@ grep -q myevent1 dynamic_events # should still have 2 left cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 2 ]; then +if [ $cnt -ne $((ocnt + 2)) ]; then exit_fail fi @@ -57,7 +61,7 @@ echo > dynamic_events # Should have none left cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 0 ]; then +if [ $cnt -ne $ocnt ]; then exit_fail fi @@ -65,7 +69,7 @@ echo "f:myevent4 $PLACE" >> dynamic_events # Should only have one enabled cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 1 ]; then +if [ $cnt -ne $((ocnt + 1)) ]; then exit_fail fi @@ -73,7 +77,7 @@ echo > dynamic_events # Should have none left cnt=`cat enabled_functions | wc -l` -if [ $cnt -ne 0 ]; then +if [ $cnt -ne $ocnt ]; then exit_fail fi |