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Subject[PATCH 40/54] perf report: Fix the output for stdio events list
Date
From: Jiri Olsa <jolsa@kernel.org>

Changing the output header for reporting forced groups via --groups
option on non grouped events, like:

$ perf record -e 'cycles,instructions'
$ perf report --stdio --group

Before:

# Samples: 24 of event 'anon group { cycles:u, instructions:u }'

After:

# Samples: 24 of events 'cycles:u, instructions:u'

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Fixes: ad52b8cb4886 ("perf report: Add support to display group output for non group events")
Link: http://lkml.kernel.org/r/20180307155020.32613-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-report.c | 17 ++++++++++++++---
tools/perf/ui/browsers/hists.c | 5 +++--
tools/perf/util/evsel.c | 20 ++++++++++++++++----
tools/perf/util/evsel.h | 1 +
4 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 1eedb1815c4c..c3603d4c0c57 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -400,8 +400,10 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report

nr_samples = convert_unit(nr_samples, &unit);
ret = fprintf(fp, "# Samples: %lu%c", nr_samples, unit);
- if (evname != NULL)
- ret += fprintf(fp, " of event '%s'", evname);
+ if (evname != NULL) {
+ ret += fprintf(fp, " of event%s '%s'",
+ evsel->nr_members > 1 ? "s" : "", evname);
+ }

if (rep->time_str)
ret += fprintf(fp, " (time slices: %s)", rep->time_str);
@@ -1175,8 +1177,17 @@ int cmd_report(int argc, const char **argv)
has_br_stack = perf_header__has_feat(&session->header,
HEADER_BRANCH_STACK);

- if (group_set && !session->evlist->nr_groups)
+ /*
+ * Events in data file are not collect in groups, but we still want
+ * the group display. Set the artificial group and set the leader's
+ * forced_leader flag to notify the display code.
+ */
+ if (group_set && !session->evlist->nr_groups) {
+ struct perf_evsel *leader = perf_evlist__first(session->evlist);
+
perf_evlist__set_leader(session->evlist);
+ leader->forced_leader = true;
+ }

if (itrace_synth_opts.last_branch)
has_br_stack = true;
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index de2bde232cb3..8b4e82548f8e 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2261,8 +2261,9 @@ static int perf_evsel_browser_title(struct hist_browser *browser,

nr_samples = convert_unit(nr_samples, &unit);
printed = scnprintf(bf, size,
- "Samples: %lu%c of event '%s',%s%sEvent count (approx.): %" PRIu64,
- nr_samples, unit, ev_name, sample_freq_str, enable_ref ? ref : " ", nr_events);
+ "Samples: %lu%c of event%s '%s',%s%sEvent count (approx.): %" PRIu64,
+ nr_samples, unit, evsel->nr_members > 1 ? "s" : "",
+ ev_name, sample_freq_str, enable_ref ? ref : " ", nr_events);


if (hists->uid_filter_str)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index e937894654b2..1ac8d9236efd 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -622,22 +622,34 @@ const char *perf_evsel__group_name(struct perf_evsel *evsel)
return evsel->group_name ?: "anon group";
}

+/*
+ * Returns the group details for the specified leader,
+ * with following rules.
+ *
+ * For record -e '{cycles,instructions}'
+ * 'anon group { cycles:u, instructions:u }'
+ *
+ * For record -e 'cycles,instructions' and report --group
+ * 'cycles:u, instructions:u'
+ */
int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
{
- int ret;
+ int ret = 0;
struct perf_evsel *pos;
const char *group_name = perf_evsel__group_name(evsel);

- ret = scnprintf(buf, size, "%s", group_name);
+ if (!evsel->forced_leader)
+ ret = scnprintf(buf, size, "%s { ", group_name);

- ret += scnprintf(buf + ret, size - ret, " { %s",
+ ret += scnprintf(buf + ret, size - ret, "%s",
perf_evsel__name(evsel));

for_each_group_member(pos, evsel)
ret += scnprintf(buf + ret, size - ret, ", %s",
perf_evsel__name(pos));

- ret += scnprintf(buf + ret, size - ret, " }");
+ if (!evsel->forced_leader)
+ ret += scnprintf(buf + ret, size - ret, " }");

return ret;
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 55ae1cda7396..d3ee3af618ef 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -125,6 +125,7 @@ struct perf_evsel {
bool per_pkg;
bool precise_max;
bool ignore_missing_thread;
+ bool forced_leader;
/* parse modifier helper */
int exclude_GH;
int nr_members;
--
2.14.3
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