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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@codeaurora.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20161024020246.14928-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2016-10-24 11:02:45 +09:00 committed by Arnaldo Carvalho de Melo
parent e107f129e2
commit 99620a5d0c
4 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/perf/builtin-sched.c
View File

@ -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;

10
tools/perf/builtin-script.c
View File

@ -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);
}
}
}

8
tools/perf/util/util.c
View File

@ -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;

3
tools/perf/util/util.h
View File

@ -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 */