util: drop statmtimesec

We've globablly forced stat to return integer times which agrees with
our extension code, so this is no longer needed.

This speeds up status on mozilla-central substantially:

$ hg perfstatus
! wall 0.190179 comb 0.180000 user 0.120000 sys 0.060000 (best of 53)
$ hg perfstatus
! wall 0.275729 comb 0.270000 user 0.210000 sys 0.060000 (best of 36)

mercurial/context.py

@@ -1705,7 +1705,7 b' class workingfilectx(committablefilectx)'
     def date(self):
         t, tz = self._changectx.date()
         try:
-            return (util.statmtimesec(self._repo.wvfs.lstat(self._path)), tz)
+            return (self._repo.wvfs.lstat(self._path).st_mtime, tz)
         except OSError as err:
             if err.errno != errno.ENOENT:
                 raise

mercurial/dirstate.py

@@ -31,7 +31,7 b' def _getfsnow(vfs):'
     '''Get "now" timestamp on filesystem'''
     tmpfd, tmpname = vfs.mkstemp()
     try:
-        return util.statmtimesec(os.fstat(tmpfd))
+        return os.fstat(tmpfd).st_mtime
     finally:
         os.close(tmpfd)
         vfs.unlink(tmpname)
@@ -471,7 +471,7 b' class dirstate(object):'
     def normal(self, f):
         '''Mark a file normal and clean.'''
         s = os.lstat(self._join(f))
-        mtime = util.statmtimesec(s)
+        mtime = s.st_mtime
         self._addpath(f, 'n', s.st_mode,
                       s.st_size & _rangemask, mtime & _rangemask)
         if f in self._copymap:
@@ -704,7 +704,7 b' class dirstate(object):'
     def _writedirstate(self, st):
         # use the modification time of the newly created temporary file as the
         # filesystem's notion of 'now'
-        now = util.statmtimesec(util.fstat(st)) & _rangemask
+        now = util.fstat(st).st_mtime & _rangemask
         st.write(parsers.pack_dirstate(self._map, self._copymap, self._pl, now))
         st.close()
         self._lastnormaltime = 0
@@ -1078,16 +1078,15 b' class dirstate(object):'
             if not st and state in "nma":
                 dadd(fn)
             elif state == 'n':
-                mtime = util.statmtimesec(st)
                 if (size >= 0 and
                     ((size != st.st_size and size != st.st_size & _rangemask)
                      or ((mode ^ st.st_mode) & 0o100 and checkexec))
                     or size == -2 # other parent
                     or fn in copymap):
                     madd(fn)
-                elif time != mtime and time != mtime & _rangemask:
+                elif time != st.st_mtime and time != st.st_mtime & _rangemask:
                     ladd(fn)
-                elif mtime == lastnormaltime:
+                elif st.st_mtime == lastnormaltime:
                     # fn may have just been marked as normal and it may have
                     # changed in the same second without changing its size.
                     # This can happen if we quickly do multiple commits.

mercurial/util.py

@@ -19,7 +19,6 b' import error, osutil, encoding, parsers'
 import errno, shutil, sys, tempfile, traceback
 import re as remod
 import os, time, datetime, calendar, textwrap, signal, collections
-import stat
 import imp, socket, urllib
 import gc
 import bz2
@@ -926,20 +925,6 b' def fstat(fp):'
     except AttributeError:
         return os.stat(fp.name)
 
-def statmtimesec(st):
-    """Get mtime as integer of seconds
-
-    'int(st.st_mtime)' cannot be used because st.st_mtime is computed as
-    'sec + 1e-9 * nsec' and double-precision floating-point type is too narrow
-    to represent nanoseconds. If 'nsec' is close to 1 sec, 'int(st.st_mtime)'
-    can be 'sec + 1'. (issue4836)
-    """
-    try:
-        return st[stat.ST_MTIME]
-    except (TypeError, IndexError):
-        # osutil.stat doesn't allow index access and its st_mtime is int
-        return st.st_mtime
-
 # File system features
 
 def checkcase(path):