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authorBrendan Gregg <bgregg@netflix.com>2017-03-14 01:56:29 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-03-14 15:17:38 -0300
commit292c4a8f985b35b3738d5900fe256c4fed4cd3f5 (patch)
tree2bf420fb13ab6fdee04a5e99db18b9bf673c8e59 /tools/perf/builtin-sched.c
parentd890a98c9217892575761d0c1311c41612844c4d (diff)
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>
Diffstat (limited to 'tools/perf/builtin-sched.c')
-rw-r--r--tools/perf/builtin-sched.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 16170e9b47e6..b92c4d97192c 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -221,6 +221,7 @@ struct perf_sched {
unsigned int max_stack;
bool show_cpu_visual;
bool show_wakeups;
+ bool show_next;
bool show_migrations;
bool show_state;
u64 skipped_samples;
@@ -1897,14 +1898,18 @@ static char task_state_char(struct thread *thread, int state)
}
static void timehist_print_sample(struct perf_sched *sched,
+ struct perf_evsel *evsel,
struct perf_sample *sample,
struct addr_location *al,
struct thread *thread,
u64 t, int state)
{
struct thread_runtime *tr = thread__priv(thread);
+ const char *next_comm = perf_evsel__strval(evsel, sample, "next_comm");
+ const u32 next_pid = perf_evsel__intval(evsel, sample, "next_pid");
u32 max_cpus = sched->max_cpu + 1;
char tstr[64];
+ char nstr[30];
u64 wait_time;
timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
@@ -1937,7 +1942,12 @@ static void timehist_print_sample(struct perf_sched *sched,
if (sched->show_state)
printf(" %5c ", task_state_char(thread, state));
- if (sched->show_wakeups)
+ if (sched->show_next) {
+ snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
+ printf(" %-*s", comm_width, nstr);
+ }
+
+ if (sched->show_wakeups && !sched->show_next)
printf(" %-*s", comm_width, "");
if (thread->tid == 0)
@@ -2531,7 +2541,7 @@ static int timehist_sched_change_event(struct perf_tool *tool,
}
if (!sched->summary_only)
- timehist_print_sample(sched, sample, &al, thread, t, state);
+ timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
out:
if (sched->hist_time.start == 0 && t >= ptime->start)
@@ -3341,6 +3351,7 @@ 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('n', "next", &sched.show_next, "Show next task"),
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"),
@@ -3438,10 +3449,14 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
if (argc)
usage_with_options(timehist_usage, timehist_options);
}
- if (sched.show_wakeups && sched.summary_only) {
- pr_err(" Error: -s and -w are mutually exclusive.\n");
+ if ((sched.show_wakeups || sched.show_next) &&
+ sched.summary_only) {
+ pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
parse_options_usage(timehist_usage, timehist_options, "s", true);
- parse_options_usage(NULL, timehist_options, "w", true);
+ if (sched.show_wakeups)
+ parse_options_usage(NULL, timehist_options, "w", true);
+ if (sched.show_next)
+ parse_options_usage(NULL, timehist_options, "n", true);
return -EINVAL;
}