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Date: Fri, 28 Oct 2016 12:42:45 -0200
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: Joonwoo Park <joonwoop@...eaurora.org>,
linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [GIT PULL] Re: [PATCH 08/15] perf tools: Introduce
timestamp_in_usec()
Em Fri, Oct 28, 2016 at 11:30:41AM -0200, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Oct 28, 2016 at 10:53:38AM -0200, Arnaldo Carvalho de Melo escreveu:
> > Em Thu, Oct 27, 2016 at 04:14:55PM -0700, Joonwoo Park escreveu:
> > > Hmm.. I didn't ACK this patch because of bug I commented at
> > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1256724.html
> > > s/work_list->max_lat/work_list->max_lat_at/
> > Sorry about that, I took the "thanks for taking care of this" as an ack,
> > now that I re-read that message I saw your points later on in that
> > e-mail.
> > Since Ingo hasn't pulled this, I'll try fixing it, will check that other
> > naming issue,
> So, here is how it ended up, it fixes the problem you pointed out and
> renames the function to follow the scnprintf() convention, as used
> elsewhere in tools/perf (tools/perf/util/annotate.h has several
> examples).
Ingo, I've just signed a perf-core-for-mingo-20161028 with the only
change being the patch below, re-run my tests, I think this doesn't
introduce any bugs and addresses Joonwoo's concerns, please consider
pulling.
Thanks,
- Arnaldo
> commit 99620a5d0cc8e2dd9aedb629a6e81825f0db020e
> Author: Namhyung Kim <namhyung@...nel.org>
> Date: Mon Oct 24 11:02:45 2016 +0900
>
> perf tools: Introduce timestamp__scnprintf_usec()
>
> Joonwoo reported that there's a mismatch between timestamps in script
> and sched commands. This was because of difference in printing the
> timestamp. Factor out the code and share it so that they can be in
> sync. Also I found that sched map has similar problem, fix it too.
>
> Committer notes:
>
> Fixed the max_lat_at bug introduced by Namhyung's original patch, as
> pointed out by Joonwoo, and made it a function following the scnprintf()
> model, i.e. returning the number of bytes formatted, and receiving as
> the first parameter the object from where the data to the formatting is
> obtained, renaming it from:
>
> char *timestamp_in_usec(char *bf, size_t size, u64 timestamp)
>
> to
>
> int timestamp__scnprintf_usec(u64 timestamp, char *bf, size_t size)
>
> Reported-by: Joonwoo Park <joonwoop@...eaurora.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Link: http://lkml.kernel.org/r/20161024020246.14928-3-namhyung@kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 1f33d15314a5..fb3441211e4b 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -1191,6 +1191,7 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
> int i;
> int ret;
> u64 avg;
> + char max_lat_at[32];
>
> if (!work_list->nb_atoms)
> return;
> @@ -1212,12 +1213,13 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
> printf(" ");
>
> avg = work_list->total_lat / work_list->nb_atoms;
> + timestamp__scnprintf_usec(work_list->max_lat_at, max_lat_at, sizeof(max_lat_at));
>
> - printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13.6f s\n",
> + printf("|%11.3f ms |%9" PRIu64 " | avg:%9.3f ms | max:%9.3f ms | max at: %13s s\n",
> (double)work_list->total_runtime / NSEC_PER_MSEC,
> work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
> (double)work_list->max_lat / NSEC_PER_MSEC,
> - (double)work_list->max_lat_at / NSEC_PER_SEC);
> + max_lat_at);
> }
>
> static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
> @@ -1402,6 +1404,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
> int cpus_nr;
> bool new_cpu = false;
> const char *color = PERF_COLOR_NORMAL;
> + char stimestamp[32];
>
> BUG_ON(this_cpu >= MAX_CPUS || this_cpu < 0);
>
> @@ -1492,7 +1495,8 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
> if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
> goto out;
>
> - color_fprintf(stdout, color, " %12.6f secs ", (double)timestamp / NSEC_PER_SEC);
> + timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
> + color_fprintf(stdout, color, " %12s secs ", stimestamp);
> if (new_shortname || (verbose && sched_in->tid)) {
> const char *pid_color = color;
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 412fb6e65ac0..e1daff36d070 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -441,7 +441,6 @@ static void print_sample_start(struct perf_sample *sample,
> {
> struct perf_event_attr *attr = &evsel->attr;
> unsigned long secs;
> - unsigned long usecs;
> unsigned long long nsecs;
>
> if (PRINT_FIELD(COMM)) {
> @@ -471,11 +470,14 @@ static void print_sample_start(struct perf_sample *sample,
> nsecs = sample->time;
> secs = nsecs / NSEC_PER_SEC;
> nsecs -= secs * NSEC_PER_SEC;
> - usecs = nsecs / NSEC_PER_USEC;
> +
> if (nanosecs)
> printf("%5lu.%09llu: ", secs, nsecs);
> - else
> - printf("%5lu.%06lu: ", secs, usecs);
> + else {
> + char sample_time[32];
> + timestamp__scnprintf_usec(sample->time, sample_time, sizeof(sample_time));
> + printf("%12s: ", sample_time);
> + }
> }
> }
>
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 85c56800f17a..5bbd1f609f1f 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -433,6 +433,14 @@ int parse_nsec_time(const char *str, u64 *ptime)
> return 0;
> }
>
> +int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
> +{
> + u64 sec = timestamp / NSEC_PER_SEC;
> + u64 usec = (timestamp % NSEC_PER_SEC) / NSEC_PER_USEC;
> +
> + return scnprintf(buf, sz, "%"PRIu64".%06"PRIu64, sec, usec);
> +}
> +
> unsigned long parse_tag_value(const char *str, struct parse_tag *tags)
> {
> struct parse_tag *i = tags;
> diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
> index 71b6992f1d98..79662d67891e 100644
> --- a/tools/perf/util/util.h
> +++ b/tools/perf/util/util.h
> @@ -362,4 +362,7 @@ extern int sched_getcpu(void);
> #endif
>
> int is_printable_array(char *p, unsigned int len);
> +
> +int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
> +
> #endif /* GIT_COMPAT_UTIL_H */
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