From 07235f84ece6b66f43334881806aad3467cf3d84 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Thu, 8 Dec 2016 23:47:54 +0900 Subject: [PATCH] perf sched timehist: Add -I/--idle-hist option The --idle-hist option is to analyze system idle state so which process makes cpu to go idle. If this option is specified, non-idle events will be skipped and processes switching to/from idle will be shown. This option is mostly useful when used with --summary(-only) option. In the idle-time summary view, idle time is accounted to previous thread which is run before idle task. The example output looks like following: Idle-time summary comm parent sched-out idle-time min-idle avg-idle max-idle stddev migrations (count) (msec) (msec) (msec) (msec) % -------------------------------------------------------------------------------------------- rcu_preempt[7] 2 95 550.872 0.011 5.798 23.146 7.63 0 migration/1[16] 2 1 15.558 15.558 15.558 15.558 0.00 0 khugepaged[39] 2 1 3.062 3.062 3.062 3.062 0.00 0 kworker/0:1H[124] 2 2 4.728 0.611 2.364 4.116 74.12 0 systemd-journal[167] 1 1 4.510 4.510 4.510 4.510 0.00 0 kworker/u16:3[558] 2 13 74.737 0.080 5.749 12.960 21.96 0 irq/34-iwlwifi[628] 2 21 118.403 0.032 5.638 23.990 24.00 0 kworker/u17:0[673] 2 1 3.523 3.523 3.523 3.523 0.00 0 dbus-daemon[722] 1 1 6.743 6.743 6.743 6.743 0.00 0 ifplugd[741] 1 1 58.826 58.826 58.826 58.826 0.00 0 wpa_supplicant[1490] 1 1 13.302 13.302 13.302 13.302 0.00 0 wpa_actiond[1492] 1 2 4.064 0.168 2.032 3.896 91.72 0 dockerd[1500] 1 1 0.055 0.055 0.055 0.055 0.00 0 ... Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Acked-by: David Ahern Cc: Andi Kleen Cc: Jiri Olsa Cc: Minchan Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20161208144755.16673-6-namhyung@kernel.org Link: http://lkml.kernel.org/r/20161213080632.19099-2-namhyung@kernel.org [ Merged fix sent by Namhyumg, as posted in the second Link: tag ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-sched.txt | 4 +++ tools/perf/builtin-sched.c | 46 ++++++++++++++++++++++--- 2 files changed, 45 insertions(+), 5 deletions(-) diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 7775b1eb2bee..76173969ab80 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -132,6 +132,10 @@ OPTIONS for 'perf sched timehist' --migrations:: Show migration events. +-I:: +--idle-hist:: + Show idle-related events only. + --time:: Only analyze samples within given time window: ,. Times have the format seconds.microseconds. If start is not given (i.e., time diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index c8e7848e71a7..0b14265432df 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -2421,7 +2421,36 @@ static int timehist_sched_change_event(struct perf_tool *tool, t = ptime->end; } - timehist_update_runtime_stats(tr, t, tprev); + if (!sched->idle_hist || thread->tid == 0) { + timehist_update_runtime_stats(tr, t, tprev); + + if (sched->idle_hist) { + struct idle_thread_runtime *itr = (void *)tr; + struct thread_runtime *last_tr; + + BUG_ON(thread->tid != 0); + + if (itr->last_thread == NULL) + goto out; + + /* add current idle time as last thread's runtime */ + last_tr = thread__get_runtime(itr->last_thread); + if (last_tr == NULL) + goto out; + + timehist_update_runtime_stats(last_tr, t, tprev); + /* + * remove delta time of last thread as it's not updated + * and otherwise it will show an invalid value next + * time. we only care total run time and run stat. + */ + last_tr->dt_run = 0; + last_tr->dt_wait = 0; + last_tr->dt_delay = 0; + + itr->last_thread = NULL; + } + } if (!sched->summary_only) timehist_print_sample(sched, sample, &al, thread, t); @@ -2543,9 +2572,15 @@ static void timehist_print_summary(struct perf_sched *sched, if (comm_width < 30) comm_width = 30; - printf("\nRuntime summary\n"); - printf("%*s parent sched-in ", comm_width, "comm"); - printf(" run-time min-run avg-run max-run stddev migrations\n"); + if (sched->idle_hist) { + printf("\nIdle-time summary\n"); + printf("%*s parent sched-out ", comm_width, "comm"); + printf(" idle-time min-idle avg-idle max-idle stddev migrations\n"); + } else { + printf("\nRuntime summary\n"); + printf("%*s parent sched-in ", comm_width, "comm"); + printf(" run-time min-run avg-run max-run stddev migrations\n"); + } printf("%*s (count) ", comm_width, ""); printf(" (msec) (msec) (msec) (msec) %%\n"); printf("%.117s\n", graph_dotted_line); @@ -2561,7 +2596,7 @@ static void timehist_print_summary(struct perf_sched *sched, printf("\n"); /* CPU idle stats not tracked when samples were skipped */ - if (sched->skipped_samples) + if (sched->skipped_samples && !sched->idle_hist) return; printf("\nIdle stats:\n"); @@ -3107,6 +3142,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused) 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_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"), OPT_STRING(0, "time", &sched.time_str, "str", "Time span for analysis (start,stop)"), OPT_PARENT(sched_options) -- 2.30.2