dirstate walking optimizations
The repo walking code introduces a number of calls to dirstate.map.copy(),
significantly slowing down the walk on large trees. When a list of
files is passed to the walking code, we should only look at map entries
relevant to the file list passed in.
dirstate.filterfiles() is added to return a subset of the dirstate map.
The subset includes in files passed in, and if one of the files requested
is actually a directory, it includes any files inside that directory tree.
This brings the time for hg diff Makefile down from 1.7s to .3s on
a linux kernel repo.
Also, the diff command was unconditionally calling makewalk, leading
to an extra pass through repo.changes. This patch avoids the call
to makewalk when commands.diff isn't given a list of patterns, cutting
the time for hg diff (with no args) in half.
Index: mine/mercurial/hg.py
===================================================================
+ hg init
+ hg add foo bar
+ hg commit -m commit text -d 0 0
+ hg clone A1 B1
+ hg remove bar
+ hg commit -m commit test -d 0 0
+ hg commit -m commit test -d 0 0
+ hg clone A1 A2
+ hg clone B1 B2
+ hg pull ../B1
pulling from ../B1
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
(run 'hg update' to get a working copy)
+ hg update -m
+ hg commit -m commit test -d 0 0
bar should remain deleted.
+ hg manifest
6b70e9e451a5a33faad7bbebe627e46b937b7364 644 foo
+ hg pull ../A2
pulling from ../A2
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 0 changes to 0 files
(run 'hg update' to get a working copy)
+ hg update -m
+ hg commit -m commit test -d 0 0
bar should remain deleted.
+ hg manifest
6b70e9e451a5a33faad7bbebe627e46b937b7364 644 foo