perf report: Move histogram entries collapsing to separate function

Further uncluttering the main 'report' function by group related code in
separate function.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-b594zsbwke8khir13kudwqmj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 45 insertions, 28 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 03941ad8fc46..cff9465847f2 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -486,13 +486,55 @@ static int report__browse_hists(struct report *rep)
         return ret;
 }
 
+static u64 report__collapse_hists(struct report *rep)
+{
+        struct ui_progress prog;
+        struct perf_evsel *pos;
+        u64 nr_samples = 0;
+        /*
+         * Count number of histogram entries to use when showing progress,
+         * reusing nr_samples variable.
+         */
+        list_for_each_entry(pos, &rep->session->evlist->entries, node)
+                nr_samples += pos->hists.nr_entries;
+
+        ui_progress__init(&prog, nr_samples, "Merging related events...");
+        /*
+         * Count total number of samples, will be used to check if this
+         * session had any.
+         */
+        nr_samples = 0;
+
+        list_for_each_entry(pos, &rep->session->evlist->entries, node) {
+                struct hists *hists = &pos->hists;
+
+                if (pos->idx == 0)
+                        hists->symbol_filter_str = rep->symbol_filter_str;
+
+                hists__collapse_resort(hists, &prog);
+                nr_samples += hists->stats.nr_events[PERF_RECORD_SAMPLE];
+
+                /* Non-group events are considered as leader */
+                if (symbol_conf.event_group &&
+                    !perf_evsel__is_group_leader(pos)) {
+                        struct hists *leader_hists = &pos->leader->hists;
+
+                        hists__match(leader_hists, hists);
+                        hists__link(leader_hists, hists);
+                }
+        }
+
+        ui_progress__finish();
+
+        return nr_samples;
+}
+
 static int __cmd_report(struct report *rep)
 {
-        int ret = -EINVAL;
+        int ret;
         u64 nr_samples;
         struct perf_session *session = rep->session;
         struct perf_evsel *pos;
-        struct ui_progress prog;
         struct perf_data_file *file = session->file;
 
         signal(SIGINT, sig_handler);
@@ -530,32 +572,7 @@ static int __cmd_report(struct report *rep)
                 }
         }
 
-        nr_samples = 0;
-        list_for_each_entry(pos, &session->evlist->entries, node)
-                nr_samples += pos->hists.nr_entries;
-
-        ui_progress__init(&prog, nr_samples, "Merging related events...");
-
-        nr_samples = 0;
-        list_for_each_entry(pos, &session->evlist->entries, node) {
-                struct hists *hists = &pos->hists;
-
-                if (pos->idx == 0)
-                        hists->symbol_filter_str = rep->symbol_filter_str;
-
-                hists__collapse_resort(hists, &prog);
-                nr_samples += hists->stats.nr_events[PERF_RECORD_SAMPLE];
-
-                /* Non-group events are considered as leader */
-                if (symbol_conf.event_group &&
-                    !perf_evsel__is_group_leader(pos)) {
-                        struct hists *leader_hists = &pos->leader->hists;
-
-                        hists__match(leader_hists, hists);
-                        hists__link(leader_hists, hists);
-                }
-        }
-        ui_progress__finish();
+        nr_samples = report__collapse_hists(rep);
 
         if (session_done())
                 return 0;