--- a/tests/check-perf-code.py	Sun Oct 09 01:03:16 2016 +0900
+++ b/tests/check-perf-code.py	Sun Oct 09 01:03:17 2016 +0900
@@ -10,6 +10,8 @@
 # write static check patterns here
 perfpypats = [
   [
+    (r'(branchmap|repoview)\.subsettable',
+     "use getbranchmapsubsettable() for early Mercurial"),
   ],
   # warnings
   [