perf hist: Introduce routine to measure lenght of formatted entry

Will be used to figure out the window width needed in the new tree
widget.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 0bc67900352c..f93095ffaab0 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -850,6 +850,33 @@ print_entries:
         return ret;
 }
 
+/*
+ * See hists__fprintf to match the column widths
+ */
+unsigned int hists__sort_list_width(struct hists *self)
+{
+        struct sort_entry *se;
+        int ret = 9; /* total % */
+
+        if (symbol_conf.show_cpu_utilization) {
+                ret += 7; /* count_sys % */
+                ret += 6; /* count_us % */
+                if (perf_guest) {
+                        ret += 13; /* count_guest_sys % */
+                        ret += 12; /* count_guest_us % */
+                }
+        }
+
+        if (symbol_conf.show_nr_samples)
+                ret += 11;
+
+        list_for_each_entry(se, &hist_entry__sort_list, list)
+                if (!se->elide)
+                        ret += 2 + hists__col_len(self, se->se_width_idx);
+
+        return ret;
+}
+
 static void hists__remove_entry_filter(struct hists *self, struct hist_entry *h,
                                        enum hist_filter filter)
 {
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 92962b2f579b..65a48db46a29 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -141,4 +141,7 @@ int hist_entry__tui_annotate(struct hist_entry *self);
 
 int hists__tui_browse_tree(struct rb_root *self, const char *help);
 #endif
+
+unsigned int hists__sort_list_width(struct hists *self);
+
 #endif  /* __PERF_HIST_H */