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perf sched timehist: Add --next option
The --next option shows the next task for each context switch, providing more context for the sequence of scheduler events. $ perf sched timehist --next | head Samples do not have callchains. time cpu task name waittime schdelay run time [tid/pid] (msec) (msec) (msec) ---------- --- ---------- --------- ------ ----- 374.793792 [0] <idle> 0.000 0.000 0.000 next: rngd[1524] 374.793801 [0] rngd[1524] 0.000 0.000 0.009 next: swapper/0[0] 374.794048 [7] <idle> 0.000 0.000 0.000 next: yes[30884] 374.794066 [7] yes[30884] 0.000 0.000 0.018 next: swapper/7[0] 374.794126 [2] <idle> 0.000 0.000 0.000 next: rngd[1524] 374.794140 [2] rngd[1524] 0.325 0.006 0.013 next: swapper/2[0] 374.794281 [3] <idle> 0.000 0.000 0.000 next: perf[31070] Signed-off-by: Brendan Gregg <bgregg@netflix.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1489456589-32555-1-git-send-email-bgregg@netflix.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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d890a98c92
commit
292c4a8f98
2 changed files with 24 additions and 5 deletions
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@ -132,6 +132,10 @@ OPTIONS for 'perf sched timehist'
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--migrations::
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Show migration events.
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-n::
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--next::
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Show next task.
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-I::
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--idle-hist::
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Show idle-related events only.
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@ -221,6 +221,7 @@ struct perf_sched {
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unsigned int max_stack;
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bool show_cpu_visual;
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bool show_wakeups;
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bool show_next;
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bool show_migrations;
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bool show_state;
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u64 skipped_samples;
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@ -1897,14 +1898,18 @@ static char task_state_char(struct thread *thread, int state)
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}
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static void timehist_print_sample(struct perf_sched *sched,
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struct perf_evsel *evsel,
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struct perf_sample *sample,
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struct addr_location *al,
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struct thread *thread,
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u64 t, int state)
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{
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struct thread_runtime *tr = thread__priv(thread);
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const char *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
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const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
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u32 max_cpus = sched->max_cpu + 1;
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char tstr[64];
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char nstr[30];
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u64 wait_time;
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timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
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@ -1937,7 +1942,12 @@ static void timehist_print_sample(struct perf_sched *sched,
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if (sched->show_state)
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printf(" %5c ", task_state_char(thread, state));
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if (sched->show_wakeups)
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if (sched->show_next) {
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snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
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printf(" %-*s", comm_width, nstr);
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}
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if (sched->show_wakeups && !sched->show_next)
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printf(" %-*s", comm_width, "");
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if (thread->tid == 0)
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@ -2531,7 +2541,7 @@ static int timehist_sched_change_event(struct perf_tool *tool,
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}
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if (!sched->summary_only)
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timehist_print_sample(sched, sample, &al, thread, t, state);
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timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
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out:
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if (sched->hist_time.start == 0 && t >= ptime->start)
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@ -3341,6 +3351,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
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OPT_BOOLEAN('S', "with-summary", &sched.summary,
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"Show all syscalls and summary with statistics"),
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OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
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OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
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OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
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OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
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OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
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@ -3438,10 +3449,14 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
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if (argc)
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usage_with_options(timehist_usage, timehist_options);
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}
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if (sched.show_wakeups && sched.summary_only) {
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pr_err(" Error: -s and -w are mutually exclusive.\n");
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if ((sched.show_wakeups || sched.show_next) &&
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sched.summary_only) {
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pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
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parse_options_usage(timehist_usage, timehist_options, "s", true);
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parse_options_usage(NULL, timehist_options, "w", true);
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if (sched.show_wakeups)
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parse_options_usage(NULL, timehist_options, "w", true);
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if (sched.show_next)
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parse_options_usage(NULL, timehist_options, "n", true);
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return -EINVAL;
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}
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