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perf sched timehist: Add option to specify time window of interest
Add option to allow user to control analysis window. e.g., collect data
for time window and analyze a segment of interest within that window.
Committer notes:
Testing it:
# perf sched record -a usleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.593 MB perf.data (25 samples) ]
#
# perf sched timehist | head -18
Samples do not have callchains.
time cpu task name wait time sch delay run time
[tid/pid] (msec) (msec) (msec)
------------- ------ --------------- --------- --------- --------
19818.635579 [0002] <idle> 0.000 0.000 0.000
19818.635613 [0000] perf[9116] 0.000 0.000 0.000
19818.635676 [0000] <idle> 0.000 0.000 0.063
19818.635678 [0000] rcuos/2[29] 0.000 0.002 0.001
19818.635696 [0002] perf[9117] 0.000 0.004 0.116
19818.635702 [0000] <idle> 0.001 0.000 0.024
19818.635709 [0002] migration/2[25] 0.000 0.003 0.012
19818.636263 [0000] usleep[9117] 0.005 0.000 0.560
19818.636316 [0000] <idle> 0.560 0.000 0.053
19818.636358 [0002] <idle> 0.129 0.000 0.649
19818.636358 [0000] usleep[9117] 0.053 0.002 0.042
#
# perf sched timehist --time 19818.635696,
Samples do not have callchains.
time cpu task name wait time sch delay run time
[tid/pid] (msec) (msec) (msec)
------------- ------ --------------- -------- --------- ---------
19818.635696 [0002] perf[9117] 0.000 0.120 0.000
19818.635702 [0000] <idle> 0.019 0.000 0.006
19818.635709 [0002] migration/2[25] 0.000 0.003 0.012
19818.636263 [0000] usleep[9117] 0.005 0.000 0.560
19818.636316 [0000] <idle> 0.560 0.000 0.053
19818.636358 [0002] <idle> 0.129 0.000 0.649
19818.636358 [0000] usleep[9117] 0.053 0.002 0.042
#
# perf sched timehist --time 19818.635696,19818.635709
Samples do not have callchains.
time cpu task name wait time sch delay run time
[tid/pid] (msec) (msec) (msec)
------------- ------ --------------- --------- --------- ---------
19818.635696 [0002] perf[9117] 0.000 0.120 0.000
19818.635702 [0000] <idle> 0.019 0.000 0.006
19818.635709 [0002] migration/2[25] 0.000 0.003 0.012
19818.635709 [0000] usleep[9117] 0.005 0.000 0.006
#
Signed-off-by: David Ahern <dsahern@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1480439746-42695-5-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern
Arnaldo Carvalho de Melo
parent
a91f4c473f
commit
853b740711
@ -132,6 +132,14 @@ OPTIONS for 'perf sched timehist'
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--migrations::
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Show migration events.
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--time::
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Only analyze samples within given time window: <start>,<stop>. Times
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have the format seconds.microseconds. If start is not given (i.e., time
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string is ',x.y') then analysis starts at the beginning of the file. If
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stop time is not given (i.e, time string is 'x.y,') then analysis goes
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to end of file.
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SEE ALSO
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--------
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linkperf:perf-record[1]
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@ -15,6 +15,7 @@
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#include "util/color.h"
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#include "util/stat.h"
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#include "util/callchain.h"
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#include "util/time-utils.h"
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#include <subcmd/parse-options.h>
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#include "util/trace-event.h"
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@ -205,6 +206,8 @@ struct perf_sched {
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bool show_wakeups;
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bool show_migrations;
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u64 skipped_samples;
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const char *time_str;
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struct perf_time_interval ptime;
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};
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/* per thread run time data */
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@ -1837,13 +1840,14 @@ static void timehist_header(struct perf_sched *sched)
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static void timehist_print_sample(struct perf_sched *sched,
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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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struct thread *thread,
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u64 t)
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{
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struct thread_runtime *tr = thread__priv(thread);
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u32 max_cpus = sched->max_cpu + 1;
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char tstr[64];
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timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
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timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
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printf("%15s [%04d] ", tstr, sample->cpu);
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if (sched->show_cpu_visual) {
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@ -2194,7 +2198,8 @@ static int timehist_sched_wakeup_event(struct perf_tool *tool,
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tr->ready_to_run = sample->time;
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/* show wakeups if requested */
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if (sched->show_wakeups)
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if (sched->show_wakeups &&
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!perf_time__skip_sample(&sched->ptime, sample->time))
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timehist_print_wakeup_event(sched, sample, machine, thread);
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return 0;
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@ -2288,10 +2293,11 @@ static int timehist_sched_change_event(struct perf_tool *tool,
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struct machine *machine)
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{
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struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
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struct perf_time_interval *ptime = &sched->ptime;
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struct addr_location al;
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struct thread *thread;
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struct thread_runtime *tr = NULL;
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u64 tprev;
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u64 tprev, t = sample->time;
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int rc = 0;
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if (machine__resolve(machine, &al, sample) < 0) {
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@ -2318,9 +2324,35 @@ static int timehist_sched_change_event(struct perf_tool *tool,
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tprev = perf_evsel__get_time(evsel, sample->cpu);
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timehist_update_runtime_stats(tr, sample->time, tprev);
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/*
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* If start time given:
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* - sample time is under window user cares about - skip sample
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* - tprev is under window user cares about - reset to start of window
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*/
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if (ptime->start && ptime->start > t)
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goto out;
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if (ptime->start > tprev)
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tprev = ptime->start;
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/*
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* If end time given:
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* - previous sched event is out of window - we are done
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* - sample time is beyond window user cares about - reset it
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* to close out stats for time window interest
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*/
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if (ptime->end) {
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if (tprev > ptime->end)
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goto out;
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if (t > ptime->end)
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t = ptime->end;
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}
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timehist_update_runtime_stats(tr, t, tprev);
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if (!sched->summary_only)
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timehist_print_sample(sched, sample, &al, thread);
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timehist_print_sample(sched, sample, &al, thread, t);
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out:
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if (tr) {
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@ -2583,6 +2615,11 @@ static int perf_sched__timehist(struct perf_sched *sched)
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symbol__init(&session->header.env);
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if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
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pr_err("Invalid time string\n");
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return -EINVAL;
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}
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if (timehist_check_attr(sched, evlist) != 0)
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goto out;
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@ -2997,6 +3034,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
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OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
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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_STRING(0, "time", &sched.time_str, "str",
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"Time span for analysis (start,stop)"),
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OPT_PARENT(sched_options)
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};
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