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 ===================================================================

     1

#!/bin/sh

     2

     3

mkdir a

     4

cd a

     5

hg init

     6

echo foo > t1

     7

hg add t1

     8

hg commit -m "1" -d "0 0"

     9

    10

cd ..

    11

hg clone a b

    12

    13

cd a

    14

echo foo > t2

    15

hg add t2

    16

hg commit -m "2" -d "0 0"

    17

    18

cd ../b

    19

echo foo > t3

    20

hg add t3

    21

hg commit -m "3" -d "0 0"

    22

    23

hg push ../a

    24

hg pull ../a

    25

hg push ../a

    26

hg up -m

    27

hg commit -m "4" -d "0 0"

    28

hg push ../a