hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

perf script: Allow specifying event to switch on processing of other events 

Sometime we want to only consider events after something happens, so
allow discarding events till such events is found, e.g.:

Record all scheduler tracepoints and the sys_enter_nanosleep syscall
event for the 'sleep 1' workload:

  # perf record -e sched:*,syscalls:sys_enter_nanosleep sleep 1
  [ perf record: Woken up 31 times to write data ]
  [ perf record: Captured and wrote 0.032 MB perf.data (10 samples) ]
  #

So we have these events in the generated perf data file:

  # perf evlist
  sched:sched_kthread_stop
  sched:sched_kthread_stop_ret
  sched:sched_waking
  sched:sched_wakeup
  sched:sched_wakeup_new
  sched:sched_switch
  sched:sched_migrate_task
  sched:sched_process_free
  sched:sched_process_exit
  sched:sched_wait_task
  sched:sched_process_wait
  sched:sched_process_fork
  sched:sched_process_exec
  sched:sched_stat_wait
  sched:sched_stat_sleep
  sched:sched_stat_iowait
  sched:sched_stat_blocked
  sched:sched_stat_runtime
  sched:sched_pi_setprio
  sched:sched_move_numa
  sched:sched_stick_numa
  sched:sched_swap_numa
  sched:sched_wake_idle_without_ipi
  syscalls:sys_enter_nanosleep
  # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
  #

Then show all of the events that actually took place in this 'perf record' session:

  # perf script
          :13637 13637 [002] 108237.581529:            sched:sched_waking: comm=perf pid=13638 prio=120 target_cpu=001
          :13637 13637 [002] 108237.581537:            sched:sched_wakeup: perf:13638 [120] success=1 CPU:001
           sleep 13638 [001] 108237.581992:      sched:sched_process_exec: filename=/usr/bin/sleep pid=13638 old_pid=13638
           sleep 13638 [001] 108237.582286:  syscalls:sys_enter_nanosleep: rqtp: 0x7fff1948ac40, rmtp: 0x00000000
           sleep 13638 [001] 108237.582289:      sched:sched_stat_runtime: comm=sleep pid=13638 runtime=578104 [ns] vruntime=202889459556 [ns]
           sleep 13638 [001] 108237.582291:            sched:sched_switch: sleep:13638 [120] S ==> swapper/1:0 [120]
         swapper     0 [001] 108238.582428:            sched:sched_waking: comm=sleep pid=13638 prio=120 target_cpu=001
         swapper     0 [001] 108238.582458:            sched:sched_wakeup: sleep:13638 [120] success=1 CPU:001
           sleep 13638 [001] 108238.582698:      sched:sched_stat_runtime: comm=sleep pid=13638 runtime=173915 [ns] vruntime=202889633471 [ns]
           sleep 13638 [001] 108238.582782:      sched:sched_process_exit: comm=sleep pid=13638 prio=120
  #

Now lets see only the ones that took place after a certain "marker":

  # perf script --switch-on syscalls:sys_enter_nanosleep
           sleep 13638 [001] 108237.582289:      sched:sched_stat_runtime: comm=sleep pid=13638 runtime=578104 [ns] vruntime=202889459556 [ns]
           sleep 13638 [001] 108237.582291:            sched:sched_switch: sleep:13638 [120] S ==> swapper/1:0 [120]
         swapper     0 [001] 108238.582428:            sched:sched_waking: comm=sleep pid=13638 prio=120 target_cpu=001
         swapper     0 [001] 108238.582458:            sched:sched_wakeup: sleep:13638 [120] success=1 CPU:001
           sleep 13638 [001] 108238.582698:      sched:sched_stat_runtime: comm=sleep pid=13638 runtime=173915 [ns] vruntime=202889633471 [ns]
           sleep 13638 [001] 108238.582782:      sched:sched_process_exit: comm=sleep pid=13638 prio=120
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: William Cohen <wcohen@redhat.com>
Link: https://lkml.kernel.org/n/tip-f1oo0ufdhrkx6nhy2lj1ierm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-08-14 16:20:13 -03:00
parent 11e54d35e6
commit f90a24171a
2 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/perf/Documentation/perf-script.txt
View File

@ -417,6 +417,9 @@ include::itrace.txt[]
For itrace only show specified functions and their callees for For itrace only show specified functions and their callees for
itrace. Multiple functions can be separated by comma. itrace. Multiple functions can be separated by comma.
--switch-on EVENT_NAME::
Only consider events after this event is found.
SEE ALSO SEE ALSO
-------- --------
linkperf:perf-record[1], linkperf:perf-script-perl[1], linkperf:perf-record[1], linkperf:perf-script-perl[1],

26
tools/perf/builtin-script.c
View File

@ -1616,6 +1616,11 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample,
return 0; return 0;
} }
struct evswitch {
struct evsel *on;
bool discarding;
};
struct perf_script { struct perf_script {
struct perf_tool tool; struct perf_tool tool;
struct perf_session *session; struct perf_session *session;
@ -1628,6 +1633,7 @@ struct perf_script {
bool show_bpf_events; bool show_bpf_events;
bool allocated; bool allocated;
bool per_event_dump; bool per_event_dump;
struct evswitch evswitch;
struct perf_cpu_map *cpus; struct perf_cpu_map *cpus;
struct perf_thread_map *threads; struct perf_thread_map *threads;
int name_width; int name_width;
@ -1805,6 +1811,13 @@ static void process_event(struct perf_script *script,
if (!show_event(sample, evsel, thread, al)) if (!show_event(sample, evsel, thread, al))
return; return;
if (script->evswitch.on && script->evswitch.discarding) {
if (script->evswitch.on != evsel)
return;
script->evswitch.discarding = false;
}
++es->samples; ++es->samples;
perf_sample__fprintf_start(sample, thread, evsel, perf_sample__fprintf_start(sample, thread, evsel,
@ -3395,6 +3408,7 @@ int cmd_script(int argc, const char **argv)
struct utsname uts; struct utsname uts;
char *script_path = NULL; char *script_path = NULL;
const char **__argv; const char **__argv;
const char *event_switch_on = NULL;
int i, j, err = 0; int i, j, err = 0;
struct perf_script script = { struct perf_script script = {
.tool = { .tool = {
@ -3538,6 +3552,8 @@ int cmd_script(int argc, const char **argv)
"file", "file saving guest os /proc/kallsyms"), "file", "file saving guest os /proc/kallsyms"),
OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules, OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
"file", "file saving guest os /proc/modules"), "file", "file saving guest os /proc/modules"),
OPT_STRING(0, "switch-on", &event_switch_on,
"event", "Consider events from the first ocurrence of this event"),
OPT_END() OPT_END()
}; };
const char * const script_subcommands[] = { "record", "report", NULL }; const char * const script_subcommands[] = { "record", "report", NULL };
@ -3862,6 +3878,16 @@ int cmd_script(int argc, const char **argv)
script.range_num); script.range_num);
} }
if (event_switch_on) {
script.evswitch.on = perf_evlist__find_evsel_by_str(session->evlist, event_switch_on);
if (script.evswitch.on == NULL) {
fprintf(stderr, "switch-on event not found (%s)\n", event_switch_on);
err = -ENOENT;
goto out_delete;
}
script.evswitch.discarding = true;
}
err = __cmd_script(&script); err = __cmd_script(&script);
flush_scripting(); flush_scripting();