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perf sched timehist: Handle cpu migration events

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Add handlers for sched:sched_migrate_task event. Total number of
migrations is added to summary display and -M/--migrations can be used
to show migration events.

Signed-off-by: David Ahern <dsahern@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1480091321-35591-1-git-send-email-dsa@cumulusnetworks.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2016-11-25 09:28:41 -07:00 committed by Arnaldo Carvalho de Melo
parent 5252b1aeab
commit 350f54fab2
2 changed files with 99 additions and 2 deletions
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4
tools/perf/Documentation/perf-sched.txt
View File

@ -128,6 +128,10 @@ OPTIONS for 'perf sched timehist'
--wakeups::
Show wakeup events.
-M::
--migrations::
Show migration events.
SEE ALSO
--------
linkperf:perf-record[1]

97
tools/perf/builtin-sched.c
View File

@ -203,6 +203,7 @@ struct perf_sched {
unsigned int max_stack;
bool show_cpu_visual;
bool show_wakeups;
bool show_migrations;
u64 skipped_samples;
};
@ -216,6 +217,8 @@ struct thread_runtime {
struct stats run_stats;
u64 total_run_time;
u64 migrations;
};
/* per event run time data */
@ -2197,6 +2200,87 @@ static int timehist_sched_wakeup_event(struct perf_tool *tool,
return 0;
}
static void timehist_print_migration_event(struct perf_sched *sched,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct machine *machine,
struct thread *migrated)
{
struct thread *thread;
char tstr[64];
u32 max_cpus = sched->max_cpu + 1;
u32 ocpu, dcpu;
if (sched->summary_only)
return;
max_cpus = sched->max_cpu + 1;
ocpu = perf_evsel__intval(evsel, sample, "orig_cpu");
dcpu = perf_evsel__intval(evsel, sample, "dest_cpu");
thread = machine__findnew_thread(machine, sample->pid, sample->tid);
if (thread == NULL)
return;
if (timehist_skip_sample(sched, thread) &&
timehist_skip_sample(sched, migrated)) {
return;
}
timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
if (sched->show_cpu_visual) {
u32 i;
char c;
printf(" ");
for (i = 0; i < max_cpus; ++i) {
c = (i == sample->cpu) ? 'm' : ' ';
printf("%c", c);
}
printf(" ");
}
printf(" %-*s ", comm_width, timehist_get_commstr(thread));
/* dt spacer */
printf(" %9s %9s %9s ", "", "", "");
printf("migrated: %s", timehist_get_commstr(migrated));
printf(" cpu %d => %d", ocpu, dcpu);
printf("\n");
}
static int timehist_migrate_task_event(struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct perf_evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
struct thread *thread;
struct thread_runtime *tr = NULL;
/* want pid of migrated task not pid in sample */
const u32 pid = perf_evsel__intval(evsel, sample, "pid");
thread = machine__findnew_thread(machine, 0, pid);
if (thread == NULL)
return -1;
tr = thread__get_runtime(thread);
if (tr == NULL)
return -1;
tr->migrations++;
/* show migrations if requested */
timehist_print_migration_event(sched, evsel, sample, machine, thread);
return 0;
}
static int timehist_sched_change_event(struct perf_tool *tool,
union perf_event *event,
struct perf_evsel *evsel,
@ -2295,6 +2379,7 @@ static void print_thread_runtime(struct thread *t,
print_sched_time(r->run_stats.max, 6);
printf(" ");
printf("%5.2f", stddev);
printf(" %5" PRIu64, r->migrations);
printf("\n");
}
@ -2356,10 +2441,10 @@ static void timehist_print_summary(struct perf_sched *sched,
printf("\nRuntime summary\n");
printf("%*s parent sched-in ", comm_width, "comm");
printf(" run-time min-run avg-run max-run stddev\n");
printf(" run-time min-run avg-run max-run stddev migrations\n");
printf("%*s (count) ", comm_width, "");
printf(" (msec) (msec) (msec) (msec) %%\n");
printf("%.105s\n", graph_dotted_line);
printf("%.117s\n", graph_dotted_line);
machine__for_each_thread(m, show_thread_runtime, &totals);
task_count = totals.task_count;
@ -2460,6 +2545,9 @@ static int perf_sched__timehist(struct perf_sched *sched)
{ "sched:sched_wakeup", timehist_sched_wakeup_event, },
{ "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
};
const struct perf_evsel_str_handler migrate_handlers[] = {
{ "sched:sched_migrate_task", timehist_migrate_task_event, },
};
struct perf_data_file file = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
@ -2507,6 +2595,10 @@ static int perf_sched__timehist(struct perf_sched *sched)
if (!perf_session__has_traces(session, "record -R"))
goto out;
if (sched->show_migrations &&
perf_session__set_tracepoints_handlers(session, migrate_handlers))
goto out;
/* pre-allocate struct for per-CPU idle stats */
sched->max_cpu = session->header.env.nr_cpus_online;
if (sched->max_cpu == 0)
@ -2903,6 +2995,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_BOOLEAN('S', "with-summary", &sched.summary,
"Show all syscalls and summary with statistics"),
OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
OPT_PARENT(sched_options)
};