[tip:perf/core] perf trace: Use sched:sched_stat_runtime to provide a thread summary

From: tip-bot for Arnaldo Carvalho de Melo
Date: Fri Oct 26 2012 - 04:57:50 EST

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Commit-ID: 1302d88e66f12a7b46a5598e641d93f0713007e0
Gitweb: http://git.kernel.org/tip/1302d88e66f12a7b46a5598e641d93f0713007e0
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Wed, 17 Oct 2012 17:13:12 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 25 Oct 2012 10:57:43 -0200

perf trace: Use sched:sched_stat_runtime to provide a thread summary

[root@sandy ~]# perf trace --sched --duration 0.100 --pid `pidof firefox`
<SNIP>
17079.847 ( 0.009 ms): 17643 poll(ufds: 140037623086496, nfds: 11, timeout_msecs: 0) = 0 Timeout
17079.892 ( 0.010 ms): 17643 read(fd: 4, buf: 140038178943092, count: 4096 ) = -1 EAGAIN Resource temporarily unavailable
17079.921 ( 0.013 ms): 17643 poll(ufds: 140037623086496, nfds: 11, timeout_msecs: 0) = 0 Timeout
17079.949 ( 0.009 ms): 17643 read(fd: 4, buf: 140038178943092, count: 4096 ) = -1 EAGAIN Resource temporarily unavailable
^C
_____________________________________________________________________
__) Summary of events (__

[ task - pid ] [ events ] [ ratio ] [ runtime ]
_____________________________________________________________________

firefox - 17643 : 18013 [ 72.2% ] 359.110 ms
firefox - 17663 : 41 [ 0.2% ] 21.439 ms
firefox - 17664 : 6840 [ 27.4% ] 133.642 ms
firefox - 17667 : 46 [ 0.2% ] 0.682 ms
[root@sandy ~]#

This is equivalent to the 'perf trace summary' subcomand in the tmp.perf/trace2
branch.

Another example, setting a huge duration filter to get just a system
wide summary:

[root@sandy ~]# perf trace --duration 10000.0 --sched
^C
_____________________________________________________________________
__) Summary of events (__

[ task - pid ] [ events ] [ ratio ] [ runtime ]
_____________________________________________________________________

scsi_eh_1 - 258 : 15 [ 0.0% ] 0.133 ms
kworker/0:1H - 322 : 13 [ 0.0% ] 0.032 ms
jbd2/dm-0-8 - 384 : 4 [ 0.0% ] 0.115 ms
flush-253:0 - 470 : 1 [ 0.0% ] 0.027 ms
firefox - 950 : 4783 [ 0.1% ] 24.863 ms
firefox - 992 : 1883 [ 0.1% ] 6.808 ms
firefox - 995 : 35 [ 0.0% ] 0.111 ms
ksoftirqd/6 - 4362 : 2 [ 0.0% ] 0.005 ms
ksoftirqd/7 - 4365 : 1 [ 0.0% ] 0.007 ms
Xorg - 4671 : 148 [ 0.0% ] 0.912 ms
gnome-settings- - 4846 : 14 [ 0.0% ] 0.086 ms
seahorse-daemon - 4847 : 14 [ 0.0% ] 0.092 ms
gnome-panel - 4875 : 46 [ 0.0% ] 0.159 ms
gnome-power-man - 4918 : 16 [ 0.0% ] 0.065 ms
gvfs-afc-volume - 4992 : 77 [ 0.0% ] 0.136 ms
gnome-screensav - 5114 : 24 [ 0.0% ] 0.128 ms
xchat - 8082 : 466 [ 0.0% ] 2.019 ms
synergyc - 8369 : 941 [ 0.0% ] 3.291 ms
synergyc - 8371 : 85 [ 0.0% ] 1.817 ms
jbd2/dm-4-8 - 9352 : 4 [ 0.0% ] 0.109 ms
rpcbind - 9786 : 3 [ 0.0% ] 0.017 ms
rtkit-daemon - 12802 : 10 [ 0.0% ] 0.038 ms
rtkit-daemon - 12803 : 8 [ 0.0% ] 0.000 ms
udisks-daemon - 13020 : 27 [ 0.0% ] 0.240 ms
kworker/7:0 - 14651 : 669 [ 0.0% ] 2.616 ms
kworker/5:1 - 16220 : 2 [ 0.0% ] 0.069 ms
kworker/4:0 - 19776 : 13 [ 0.0% ] 0.176 ms
openvpn - 20131 : 133 [ 0.0% ] 0.762 ms
plugin-containe - 20508 : 60658 [ 1.7% ] 131.153 ms
npviewer.bin - 20520 : 72208 [ 2.0% ] 138.945 ms
npviewer.bin - 20542 : 35 [ 0.0% ] 0.074 ms
npviewer.bin - 20543 : 30 [ 0.0% ] 0.074 ms
npviewer.bin - 20547 : 35 [ 0.0% ] 0.092 ms
npviewer.bin - 20552 : 35 [ 0.0% ] 0.093 ms
sshd - 20645 : 32 [ 0.0% ] 0.071 ms
npviewer.bin - 21053 : 35 [ 0.0% ] 0.074 ms
npviewer.bin - 21054 : 35 [ 0.0% ] 0.097 ms
kworker/0:2 - 21169 : 149 [ 0.0% ] 1.143 ms
kworker/3:0 - 22171 : 113 [ 0.0% ] 96.892 ms
flush-253:4 - 22410 : 1 [ 0.0% ] 0.028 ms
kworker/6:0 - 24581 : 25 [ 0.0% ] 0.275 ms
kworker/1:0 - 25572 : 4 [ 0.0% ] 0.103 ms
kworker/2:1 - 26299 : 138 [ 0.0% ] 1.440 ms
kworker/0:0 - 26325 : 1 [ 0.0% ] 0.003 ms
perf - 26330 : 3506967 [ 96.1% ] 6648.310 ms
[root@sandy ~]#

Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-mzuli0srnxyi1o029py6537x@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/Documentation/perf-trace.txt | 3 +
tools/perf/builtin-trace.c | 88 ++++++++++++++++++++++++++++++-
2 files changed, 90 insertions(+), 1 deletions(-)

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index 38d4b68..68718cc 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -51,6 +51,9 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
--duration:
Show only events that had a duration greater than N.M ms.

+--sched:
+ Accrue thread runtime and provide a summary at the end of the session.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-script[1]
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c95a3e9..7932ffa 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -69,6 +69,7 @@ struct thread_trace {
bool entry_pending;
unsigned long nr_events;
char *entry_str;
+ double runtime_ms;
};

static struct thread_trace *thread_trace__new(void)
@@ -109,8 +110,10 @@ struct trace {
struct machine host;
u64 base_time;
unsigned long nr_events;
+ bool sched;
bool multiple_threads;
double duration_filter;
+ double runtime_ms;
};

static bool trace__filter_duration(struct trace *trace, double t)
@@ -389,6 +392,31 @@ out:
return 0;
}

+static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
+ struct perf_sample *sample)
+{
+ u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
+ double runtime_ms = (double)runtime / NSEC_PER_MSEC;
+ struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
+ struct thread_trace *ttrace = thread__trace(thread);
+
+ if (ttrace == NULL)
+ goto out_dump;
+
+ ttrace->runtime_ms += runtime_ms;
+ trace->runtime_ms += runtime_ms;
+ return 0;
+
+out_dump:
+ printf("%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
+ evsel->name,
+ perf_evsel__strval(evsel, sample, "comm"),
+ (pid_t)perf_evsel__intval(evsel, sample, "pid"),
+ runtime,
+ perf_evsel__intval(evsel, sample, "vruntime"));
+ return 0;
+}
+
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
@@ -408,6 +436,13 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
goto out_delete_evlist;
}

+ if (trace->sched &&
+ perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
+ trace__sched_stat_runtime)) {
+ printf("Couldn't read the sched_stat_runtime tracepoint information!\n");
+ goto out_delete_evlist;
+ }
+
err = perf_evlist__create_maps(evlist, &trace->opts.target);
if (err < 0) {
printf("Problems parsing the target to trace, check your options!\n");
@@ -521,6 +556,51 @@ out:
return err;
}

+static size_t trace__fprintf_threads_header(FILE *fp)
+{
+ size_t printed;
+
+ printed = fprintf(fp, "\n _____________________________________________________________________\n");
+ printed += fprintf(fp," __) Summary of events (__\n\n");
+ printed += fprintf(fp," [ task - pid ] [ events ] [ ratio ] [ runtime ]\n");
+ printed += fprintf(fp," _____________________________________________________________________\n\n");
+
+ return printed;
+}
+
+static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
+{
+ size_t printed = trace__fprintf_threads_header(fp);
+ struct rb_node *nd;
+
+ for (nd = rb_first(&trace->host.threads); nd; nd = rb_next(nd)) {
+ struct thread *thread = rb_entry(nd, struct thread, rb_node);
+ struct thread_trace *ttrace = thread->priv;
+ const char *color;
+ double ratio;
+
+ if (ttrace == NULL)
+ continue;
+
+ ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
+
+ color = PERF_COLOR_NORMAL;
+ if (ratio > 50.0)
+ color = PERF_COLOR_RED;
+ else if (ratio > 25.0)
+ color = PERF_COLOR_GREEN;
+ else if (ratio > 5.0)
+ color = PERF_COLOR_YELLOW;
+
+ printed += color_fprintf(fp, color, "%20s", thread->comm);
+ printed += fprintf(fp, " - %-5d :%11lu [", thread->pid, ttrace->nr_events);
+ printed += color_fprintf(fp, color, "%5.1f%%", ratio);
+ printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
+ }
+
+ return printed;
+}
+
static int trace__set_duration(const struct option *opt, const char *str,
int unset __maybe_unused)
{
@@ -571,6 +651,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_CALLBACK(0, "duration", &trace, "float",
"show only events with duration > N.M ms",
trace__set_duration),
+ OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
OPT_END()
};
int err;
@@ -595,5 +676,10 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
if (!argc && perf_target__none(&trace.opts.target))
trace.opts.target.system_wide = true;

- return trace__run(&trace, argc, argv);
+ err = trace__run(&trace, argc, argv);
+
+ if (trace.sched && !err)
+ trace__fprintf_thread_summary(&trace, stdout);
+
+ return err;
}
--
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Next message: Namhyung Kim: "[PATCH 3/5] perf tools: Convert invocation of MAKE into SUBDIR"
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