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perf sched: Move curr_pid and cpu_last_switched initialization to per…
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…f_sched__{lat|map|replay}()

[ Upstream commit bd2cdf2 ]

The curr_pid and cpu_last_switched are used only for the
'perf sched replay/latency/map'. Put their initialization in
perf_sched__{lat|map|replay () to reduce unnecessary actions in other
commands.

Simple functional testing:

  # perf sched record perf bench sched messaging
  # Running 'sched/messaging' benchmark:
  # 20 sender and receiver processes per group
  # 10 groups == 400 processes run

       Total time: 0.209 [sec]
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 16.456 MB perf.data (147907 samples) ]

  # perf sched lat

   -------------------------------------------------------------------------------------------------------------------------------------------
    Task                  |   Runtime ms  | Switches | Avg delay ms    | Max delay ms    | Max delay start           | Max delay end          |
   -------------------------------------------------------------------------------------------------------------------------------------------
    sched-messaging:(401) |   2990.699 ms |    38705 | avg:   0.661 ms | max:  67.046 ms | max start: 456532.624830 s | max end: 456532.691876 s
    qemu-system-x86:(7)   |    179.764 ms |     2191 | avg:   0.152 ms | max:  21.857 ms | max start: 456532.576434 s | max end: 456532.598291 s
    sshd:48125            |      0.522 ms |        2 | avg:   0.037 ms | max:   0.046 ms | max start: 456532.514610 s | max end: 456532.514656 s
  <SNIP>
    ksoftirqd/11:82       |      0.063 ms |        1 | avg:   0.005 ms | max:   0.005 ms | max start: 456532.769366 s | max end: 456532.769371 s
    kworker/9:0-mm_:34624 |      0.233 ms |       20 | avg:   0.004 ms | max:   0.007 ms | max start: 456532.690804 s | max end: 456532.690812 s
    migration/13:93       |      0.000 ms |        1 | avg:   0.004 ms | max:   0.004 ms | max start: 456532.512669 s | max end: 456532.512674 s
   -----------------------------------------------------------------------------------------------------------------
    TOTAL:                |   3180.750 ms |    41368 |
   ---------------------------------------------------

  # echo $?
  0

  # perf sched map
    *A0                                                               456532.510141 secs A0 => migration/0:15
    *.                                                                456532.510171 secs .  => swapper:0
     .  *B0                                                           456532.510261 secs B0 => migration/1:21
     .  *.                                                            456532.510279 secs
  <SNIP>
     L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7 *L7  .   .   .   .    456532.785979 secs
     L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7 *L7  .   .   .    456532.786054 secs
     L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7 *L7  .   .    456532.786127 secs
     L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7 *L7  .    456532.786197 secs
     L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7  L7 *L7   456532.786270 secs
  # echo $?
  0

  # perf sched replay
  run measurement overhead: 108 nsecs
  sleep measurement overhead: 66473 nsecs
  the run test took 1000002 nsecs
  the sleep test took 1082686 nsecs
  nr_run_events:        49334
  nr_sleep_events:      50054
  nr_wakeup_events:     34701
  target-less wakeups:  165
  multi-target wakeups: 766
  task      0 (             swapper:         0), nr_events: 15419
  task      1 (             swapper:         1), nr_events: 1
  task      2 (             swapper:         2), nr_events: 1
  <SNIP>
  task    715 (     sched-messaging:    110248), nr_events: 1438
  task    716 (     sched-messaging:    110249), nr_events: 512
  task    717 (     sched-messaging:    110250), nr_events: 500
  task    718 (     sched-messaging:    110251), nr_events: 537
  task    719 (     sched-messaging:    110252), nr_events: 823
  ------------------------------------------------------------
  #1  : 1325.288, ravg: 1325.29, cpu: 7823.35 / 7823.35
  #2  : 1363.606, ravg: 1329.12, cpu: 7655.53 / 7806.56
  #3  : 1349.494, ravg: 1331.16, cpu: 7544.80 / 7780.39
  #4  : 1311.488, ravg: 1329.19, cpu: 7495.13 / 7751.86
  #5  : 1309.902, ravg: 1327.26, cpu: 7266.65 / 7703.34
  gregkh#6  : 1309.535, ravg: 1325.49, cpu: 7843.86 / 7717.39
  gregkh#7  : 1316.482, ravg: 1324.59, cpu: 7854.41 / 7731.09
  gregkh#8  : 1366.604, ravg: 1328.79, cpu: 7955.81 / 7753.57
  gregkh#9  : 1326.286, ravg: 1328.54, cpu: 7466.86 / 7724.90
  gregkh#10 : 1356.653, ravg: 1331.35, cpu: 7566.60 / 7709.07
  # echo $?
  0

Signed-off-by: Yang Jihong <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Stable-dep-of: 1a5efc9 ("libsubcmd: Don't free the usage string")
Signed-off-by: Sasha Levin <[email protected]>
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@gregkh
Yang Jihong authored and gregkh committed Oct 17, 2024
1 parent 5a708ab commit bfe9535
Showing 1 changed file with 61 additions and 33 deletions.
94 changes: 61 additions & 33 deletions tools/perf/builtin-sched.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3199,14 +3199,44 @@ static void perf_sched__merge_lat(struct perf_sched *sched)
}
}

static int setup_cpus_switch_event(struct perf_sched *sched)
{
unsigned int i;

sched->cpu_last_switched = calloc(MAX_CPUS, sizeof(*(sched->cpu_last_switched)));
if (!sched->cpu_last_switched)
return -1;

sched->curr_pid = malloc(MAX_CPUS * sizeof(*(sched->curr_pid)));
if (!sched->curr_pid) {
zfree(&sched->cpu_last_switched);
return -1;
}

for (i = 0; i < MAX_CPUS; i++)
sched->curr_pid[i] = -1;

return 0;
}

static void free_cpus_switch_event(struct perf_sched *sched)
{
zfree(&sched->curr_pid);
zfree(&sched->cpu_last_switched);
}

static int perf_sched__lat(struct perf_sched *sched)
{
int rc = -1;
struct rb_node *next;

setup_pager();

if (setup_cpus_switch_event(sched))
return rc;

if (perf_sched__read_events(sched))
return -1;
goto out_free_cpus_switch_event;

perf_sched__merge_lat(sched);
perf_sched__sort_lat(sched);
Expand Down Expand Up @@ -3235,7 +3265,11 @@ static int perf_sched__lat(struct perf_sched *sched)
print_bad_events(sched);
printf("\n");

return 0;
rc = 0;

out_free_cpus_switch_event:
free_cpus_switch_event(sched);
return rc;
}

static int setup_map_cpus(struct perf_sched *sched)
Expand Down Expand Up @@ -3302,9 +3336,12 @@ static int perf_sched__map(struct perf_sched *sched)
if (!sched->curr_thread)
return rc;

if (setup_map_cpus(sched))
if (setup_cpus_switch_event(sched))
goto out_free_curr_thread;

if (setup_map_cpus(sched))
goto out_free_cpus_switch_event;

if (setup_color_pids(sched))
goto out_put_map_cpus;

Expand All @@ -3328,6 +3365,9 @@ static int perf_sched__map(struct perf_sched *sched)
zfree(&sched->map.comp_cpus);
perf_cpu_map__put(sched->map.cpus);

out_free_cpus_switch_event:
free_cpus_switch_event(sched);

out_free_curr_thread:
zfree(&sched->curr_thread);
return rc;
Expand All @@ -3341,14 +3381,18 @@ static int perf_sched__replay(struct perf_sched *sched)
mutex_init(&sched->start_work_mutex);
mutex_init(&sched->work_done_wait_mutex);

ret = setup_cpus_switch_event(sched);
if (ret)
goto out_mutex_destroy;

calibrate_run_measurement_overhead(sched);
calibrate_sleep_measurement_overhead(sched);

test_calibrations(sched);

ret = perf_sched__read_events(sched);
if (ret)
goto out_mutex_destroy;
goto out_free_cpus_switch_event;

printf("nr_run_events: %ld\n", sched->nr_run_events);
printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
Expand All @@ -3374,6 +3418,9 @@ static int perf_sched__replay(struct perf_sched *sched)
sched->thread_funcs_exit = true;
destroy_tasks(sched);

out_free_cpus_switch_event:
free_cpus_switch_event(sched);

out_mutex_destroy:
mutex_destroy(&sched->start_work_mutex);
mutex_destroy(&sched->work_done_wait_mutex);
Expand Down Expand Up @@ -3612,21 +3659,7 @@ int cmd_sched(int argc, const char **argv)
.switch_event = replay_switch_event,
.fork_event = replay_fork_event,
};
unsigned int i;
int ret = 0;

sched.cpu_last_switched = calloc(MAX_CPUS, sizeof(*sched.cpu_last_switched));
if (!sched.cpu_last_switched) {
ret = -ENOMEM;
goto out;
}
sched.curr_pid = malloc(MAX_CPUS * sizeof(*sched.curr_pid));
if (!sched.curr_pid) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < MAX_CPUS; i++)
sched.curr_pid[i] = -1;
int ret;

argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
Expand All @@ -3637,9 +3670,9 @@ int cmd_sched(int argc, const char **argv)
* Aliased to 'perf script' for now:
*/
if (!strcmp(argv[0], "script")) {
ret = cmd_script(argc, argv);
return cmd_script(argc, argv);
} else if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
ret = __cmd_record(argc, argv);
return __cmd_record(argc, argv);
} else if (strlen(argv[0]) > 2 && strstarts("latency", argv[0])) {
sched.tp_handler = &lat_ops;
if (argc > 1) {
Expand All @@ -3648,7 +3681,7 @@ int cmd_sched(int argc, const char **argv)
usage_with_options(latency_usage, latency_options);
}
setup_sorting(&sched, latency_options, latency_usage);
ret = perf_sched__lat(&sched);
return perf_sched__lat(&sched);
} else if (!strcmp(argv[0], "map")) {
if (argc) {
argc = parse_options(argc, argv, map_options, map_usage, 0);
Expand All @@ -3657,15 +3690,15 @@ int cmd_sched(int argc, const char **argv)
}
sched.tp_handler = &map_ops;
setup_sorting(&sched, latency_options, latency_usage);
ret = perf_sched__map(&sched);
return perf_sched__map(&sched);
} else if (strlen(argv[0]) > 2 && strstarts("replay", argv[0])) {
sched.tp_handler = &replay_ops;
if (argc) {
argc = parse_options(argc, argv, replay_options, replay_usage, 0);
if (argc)
usage_with_options(replay_usage, replay_options);
}
ret = perf_sched__replay(&sched);
return perf_sched__replay(&sched);
} else if (!strcmp(argv[0], "timehist")) {
if (argc) {
argc = parse_options(argc, argv, timehist_options,
Expand All @@ -3681,21 +3714,16 @@ int cmd_sched(int argc, const char **argv)
parse_options_usage(NULL, timehist_options, "w", true);
if (sched.show_next)
parse_options_usage(NULL, timehist_options, "n", true);
ret = -EINVAL;
goto out;
return -EINVAL;
}
ret = symbol__validate_sym_arguments();
if (ret)
goto out;
return ret;

ret = perf_sched__timehist(&sched);
return perf_sched__timehist(&sched);
} else {
usage_with_options(sched_usage, sched_options);
}

out:
free(sched.curr_pid);
free(sched.cpu_last_switched);

return ret;
return 0;
}

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