diff -r 8f8211903b83 -r be5b2098a817 contrib/perf.py
--- a/contrib/perf.py	Fri Dec 09 03:22:26 2016 -0800
+++ b/contrib/perf.py	Tue Dec 13 14:21:36 2016 +0000
@@ -999,7 +999,7 @@
     def dohash(text):
         if not cache:
             r.clearcaches()
-        r._checkhash(text, node, rev)
+        r.checkhash(text, node, rev=rev)
 
     def dorevision():
         if not cache: