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'

Link: http://lkml.kernel.org/n/tip-1uizixi38t1v9cj2sgtmk...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 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 f1f883bb41a8..8948a8c1c187 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -621,22 +621,34 @@ 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 92ba001b627f..bb17afc429d9 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;
-- 
2.13.6

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