perf hist: Calculate max_sym name len and nr_entries

Better done when we are adding entries, be it initially of when we're
re-sorting the histograms.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index bdde81e..1b18d04 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -19,10 +19,12 @@
 struct hists {
 	struct rb_node		rb_node;
 	struct rb_root		entries;
+	u64			nr_entries;
 	struct events_stats	stats;
 	u64			config;
 	u64			event_stream;
 	u32			type;
+	u32			max_sym_namelen;
 };
 
 struct hist_entry *__hists__add_entry(struct hists *self,
@@ -38,7 +40,7 @@
 			 long displacement, bool color, u64 total);
 void hist_entry__free(struct hist_entry *);
 
-u64 hists__output_resort(struct hists *self);
+void hists__output_resort(struct hists *self);
 void hists__collapse_resort(struct hists *self);
 size_t hists__fprintf(struct hists *self, struct hists *pair,
 		      bool show_displacement, FILE *fp);