diff -r 1b2fa531fd7a -r c50078fc32f3 mercurial/manifest.py
--- a/mercurial/manifest.py	Tue Apr 03 00:13:02 2018 -0700
+++ b/mercurial/manifest.py	Mon Apr 02 23:46:04 2018 -0700
@@ -1279,6 +1279,7 @@
         self._treeinmem = usetreemanifest
 
         self._revlog = repo._constructmanifest()
+        self._narrowmatch = repo.narrowmatch()
 
         # A cache of the manifestctx or treemanifestctx for each directory
         self._dirmancache = {}
@@ -1477,6 +1478,10 @@
         #self.linkrev = revlog.linkrev(rev)
 
     def _revlog(self):
+        narrowmatch = self._manifestlog._narrowmatch
+        if not narrowmatch.always():
+            if not narrowmatch.visitdir(self._dir[:-1] or '.'):
+                return excludedmanifestrevlog(self._dir)
         return self._manifestlog._revlog.dirlog(self._dir)
 
     def read(self):