--- a/contrib/perf.py	Thu Nov 14 15:28:44 2019 -0500
+++ b/contrib/perf.py	Thu Nov 14 15:29:27 2019 -0500
@@ -788,7 +788,7 @@
             s = dirstate.status(
                 m, subrepos=[], ignored=False, clean=False, unknown=unknown
             )
-            sum(map(len, s))
+            sum(map(bool, s))
 
         timer(status_dirstate)
     else: