diff --git a/remotefilelog/remotefilectx.py b/remotefilelog/remotefilectx.py
--- a/remotefilelog/remotefilectx.py
+++ b/remotefilelog/remotefilectx.py
@@ -9,6 +9,7 @@
 from mercurial.i18n import _
 from mercurial.node import bin, hex, nullid, nullrev
 from mercurial import context, util, error, ancestor, phases, extensions
+from . import shallowutil
 
 propertycache = util.propertycache
 conduit = None
@@ -240,6 +241,16 @@
         if self._verifylinknode(revs, linknode):
             return linknode
 
+        commonlogkwargs = {
+            'revs': ' '.join([hex(cl.node(rev)) for rev in revs]),
+            'fnode': hex(fnode),
+            'filepath': path,
+            'user': shallowutil.getusername(repo.ui),
+            'reponame': shallowutil.getreponame(repo.ui),
+        }
+
+        repo.ui.log('linkrevfixup', 'adjusting linknode', **commonlogkwargs)
+
         pc = repo._phasecache
         seenpublic = False
         iteranc = cl.ancestors(revs, inclusive=inclusive)
@@ -296,7 +307,7 @@
                 # commits
                 if repo.ui.configbool('fastlog', 'enabled'):
                     lnode = self._linknodeviafastlog(repo, path, ancrev, fnode,
-                                                     cl, mfl)
+                                                     cl, mfl, commonlogkwargs)
                     if lnode:
                         return lnode
                 seenpublic = True
@@ -320,7 +331,8 @@
 
         return linknode
 
-    def _linknodeviafastlog(self, repo, path, srcrev, fnode, cl, mfl):
+    def _linknodeviafastlog(self, repo, path, srcrev, fnode, cl, mfl,
+                            commonlogkwargs):
         reponame = repo.ui.config('fbconduit', 'reponame')
         logmsg = ''
         if self._conduit is None:
@@ -351,7 +363,7 @@
             logmsg = 'fastlog failed (%s)' % e
             return None
         finally:
-            repo.ui.log('linkrevfixup', logmsg)
+            repo.ui.log('linkrevfixup', logmsg, **commonlogkwargs)
 
 
     def _verifylinknode(self, revs, linknode):
diff --git a/remotefilelog/shallowutil.py b/remotefilelog/shallowutil.py
--- a/remotefilelog/shallowutil.py
+++ b/remotefilelog/shallowutil.py
@@ -477,3 +477,15 @@
 def peercapabilities(peer):
     """return capabilities of a peer"""
     return trygetattr(peer, ('_capabilities', 'capabilities'))()
+
+def getusername(ui):
+    try:
+        return util.shortuser(ui.username())
+    except Exception:
+        return 'unknown'
+
+def getreponame(ui):
+    reponame = ui.config('paths', 'default')
+    if reponame:
+        return os.path.basename(reponame)
+    return "unknown"
diff --git a/tests/test-remotefilelog-linknodes.t b/tests/test-remotefilelog-linknodes.t
--- a/tests/test-remotefilelog-linknodes.t
+++ b/tests/test-remotefilelog-linknodes.t
@@ -315,3 +315,41 @@
   > EOF
   $ rm $TESTTMP/bad_conduit.pyc
   $ hg log -f x > /dev/null
+
+Test linknode fixup logging
+
+Setup extension that logs ui.log linkrevfixup output on the stderr
+  $ cat >> $TESTTMP/uilog.py <<EOF
+  > from mercurial import extensions
+  > from mercurial import ui as uimod
+  > def uisetup(ui):
+  >     extensions.wrapfunction(uimod.ui, 'log', mylog)
+  > def mylog(orig, self, service, *msg, **opts):
+  >     if service in ['linkrevfixup']:
+  >         kwstr = ", ".join("%s=%s" % (k, v) for k, v in
+  >                           sorted(opts.iteritems()))
+  >         msgstr = msg[0] % msg[1:]
+  >         self.warn('%s: %s (%s)\n' % (service, msgstr, kwstr))
+  >     return orig(self, service, *msg, **opts)
+  > EOF
+  $ cat >> $HGRCPATH <<EOF
+  > [extensions]
+  > uilog=$TESTTMP/uilog.py
+  > EOF
+
+Silencing stdout because we are interested only in ui.log output
+  $ hg log -f x -T '{node|short} {desc} {phase} {files}\n' > /dev/null
+  linkrevfixup: adjusting linknode (filepath=x, fnode=d4a3ed9310e5bd9887e3bf779da5077efab28216, reponame=master, revs=a5957b6bf0bdeb9b96368bddd2838004ad966b7d, user=test)
+  linkrevfixup: fastlog succeded (filepath=x, fnode=d4a3ed9310e5bd9887e3bf779da5077efab28216, reponame=master, revs=a5957b6bf0bdeb9b96368bddd2838004ad966b7d, user=test)
+
+Fastlog fails
+  $ cat > $TESTTMP/bad_conduit.py <<EOF
+  > def call_conduit(*args, **kwargs):
+  >   raise Exception('error')
+  > def conduit_config(*args, **kwargs):
+  >   return True
+  > EOF
+  $ rm $TESTTMP/bad_conduit.pyc
+  $ hg log -f x -T '{node|short} {desc} {phase} {files}\n' > /dev/null
+  linkrevfixup: adjusting linknode (filepath=x, fnode=d4a3ed9310e5bd9887e3bf779da5077efab28216, reponame=master, revs=a5957b6bf0bdeb9b96368bddd2838004ad966b7d, user=test)
+  linkrevfixup: fastlog failed (error) (filepath=x, fnode=d4a3ed9310e5bd9887e3bf779da5077efab28216, reponame=master, revs=a5957b6bf0bdeb9b96368bddd2838004ad966b7d, user=test)