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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-12-09 21:40:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-10 08:30:26 +0100 |
| commit | 3786310afe738070be31c439b8deeaeb69b9735d (patch) | |
| tree | 8148395e586322c13efb0f72ba3a0c6f15e9ad45 /tools | |
| parent | 5660ce34241ab204bf78fbcaa5e09318c2748d37 (diff) | |
| download | linux-3786310afe738070be31c439b8deeaeb69b9735d.tar.gz linux-3786310afe738070be31c439b8deeaeb69b9735d.tar.bz2 linux-3786310afe738070be31c439b8deeaeb69b9735d.zip | |
perf sched: Add max delay time snapshot
When we have a maximum latency reported for a task, we need a
convenient way to find the matching location to the raw traces
or to perf sched map that shows where the task has been
eventually scheduled in. This gives a pointer to retrieve the
events that occured during this max latency.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260391208-6808-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-sched.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index b12b23ac06f3..7cca7c15b40a 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -140,6 +140,7 @@ struct work_atoms { struct thread *thread; struct rb_node node; u64 max_lat; + u64 max_lat_at; u64 total_lat; u64 nb_atoms; u64 total_runtime; @@ -1013,8 +1014,10 @@ add_sched_in_event(struct work_atoms *atoms, u64 timestamp) delta = atom->sched_in_time - atom->wake_up_time; atoms->total_lat += delta; - if (delta > atoms->max_lat) + if (delta > atoms->max_lat) { atoms->max_lat = delta; + atoms->max_lat_at = timestamp; + } atoms->nb_atoms++; } @@ -1210,10 +1213,11 @@ static void output_lat_thread(struct work_atoms *work_list) avg = work_list->total_lat / work_list->nb_atoms; - printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms |\n", + printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms | max at: %9.6f s\n", (double)work_list->total_runtime / 1e6, work_list->nb_atoms, (double)avg / 1e6, - (double)work_list->max_lat / 1e6); + (double)work_list->max_lat / 1e6, + (double)work_list->max_lat_at / 1e9); } static int pid_cmp(struct work_atoms *l, struct work_atoms *r) @@ -1704,9 +1708,9 @@ static void __cmd_lat(void) read_events(); sort_lat(); - printf("\n -----------------------------------------------------------------------------------------\n"); - printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms |\n"); - printf(" -----------------------------------------------------------------------------------------\n"); + printf("\n ---------------------------------------------------------------------------------------------------------------\n"); + printf(" Task | Runtime ms | Switches | Average delay ms | Maximum delay ms | Maximum delay at |\n"); + printf(" ---------------------------------------------------------------------------------------------------------------\n"); next = rb_first(&sorted_atom_root); |