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Nguyễn Thái Ngọc Duy e721c1544f checkout: avoid unnecessary match_pathspec calls 
In checkout_paths() we do this

 - for all updated items, call match_pathspec
 - for all items, call match_pathspec (inside unmerge_cache)
 - for all items, call match_pathspec (for showing "path .. is unmerged)
 - for updated items, call match_pathspec and update paths

That's a lot of duplicate match_pathspec(s) and the function is not
exactly cheap to be called so many times, especially on large indexes.
This patch makes it call match_pathspec once per updated index entry,
save the result in ce_flags and reuse the results in the following
loops.

The changes in 0a1283b (checkout $tree $path: do not clobber local
changes in $path not in $tree - 2011-09-30) limit the affected paths
to ones we read from $tree. We do not do anything to other modified
entries in this case, so the "for all items" above could be modified
to "for all updated items". But..

The command's behavior now is modified slightly: unmerged entries that
match $path, but not updated by $tree, are now NOT touched.  Although
this should be considered a bug fix, not a regression. A new test is
added for this change.

And while at there, free ps_matched after use.

The following command is tested on webkit, 215k entries. The pattern
is chosen mainly to make match_pathspec sweat:

git checkout -- "*[a-zA-Z]*[a-zA-Z]*[a-zA-Z]*"

        before      after
real    0m3.493s    0m2.737s
user    0m2.239s    0m1.586s
sys     0m1.252s    0m1.151s

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-03-27 08:53:15 -07:00
..
add.c add: update pathless 'add [-u|-A]' warning to reflect change of plan 2013-03-11 07:57:35 -07:00
annotate.c
apply.c Merge branch 'jc/extended-fake-ancestor-for-gitlink' 2013-02-14 10:28:48 -08:00
archive.c Reduce translations by using same terminologies 2012-08-22 12:02:28 -07:00
bisect--helper.c i18n: bisect--helper: mark parseopt strings for translation 2012-08-20 12:23:15 -07:00
blame.c logmsg_reencode: lazily load missing commit buffers 2013-01-26 13:28:22 -08:00
branch.c Merge branch 'nd/branch-error-cases' 2013-03-21 14:02:51 -07:00
bundle.c
cat-file.c drop some obsolete "x = x" compiler warning hacks 2013-03-21 14:06:38 -07:00
check-attr.c Merge branch 'maint' 2012-09-17 15:59:34 -07:00
check-ignore.c name-hash: allow hashing an empty string 2013-02-19 14:00:12 -08:00
check-ref-format.c
checkout-index.c Use imperative form in help usage to describe an action 2012-08-22 12:02:28 -07:00
checkout.c checkout: avoid unnecessary match_pathspec calls 2013-03-27 08:53:15 -07:00
clean.c Merge branch 'as/check-ignore' 2013-01-23 21:19:10 -08:00
clone.c Merge branch 'jc/no-git-config-in-clone' 2013-02-01 12:39:37 -08:00
column.c i18n: column: mark parseopt strings for translation 2012-08-20 12:23:16 -07:00
commit-tree.c Merge branch 'kk/maint-commit-tree' 2012-07-23 20:55:54 -07:00
commit.c git-commit: only append a newline to -m mesg if necessary 2013-02-19 09:30:50 -08:00
config.c Merge branch 'cn/config-missing-path' into maint 2012-11-25 18:35:46 -08:00
count-objects.c count-objects: report how much disk space taken by garbage files 2013-02-15 09:02:34 -08:00
credential.c
describe.c Fix ".git/refs" stragglers 2013-02-24 22:23:32 -08:00
diff-files.c
diff-index.c update-index/diff-index: use core.preloadindex to improve performance 2012-11-02 11:38:29 -04:00
diff-tree.c
diff.c Merge branch 'kb/preload-index-more' 2012-11-20 10:32:10 -08:00
fast-export.c fast-export: make sure updated refs get updated 2012-12-03 09:57:16 -08:00
fetch-pack.c fetch: use struct ref to represent refs to be fetched 2013-02-07 13:53:59 -08:00
fetch.c Merge branch 'jk/gc-auto-after-fetch' 2013-02-01 12:40:16 -08:00
fmt-merge-msg.c Merge branch 'mg/gpg-interface-using-status' 2013-03-21 14:02:55 -07:00
for-each-ref.c Merge branch 'nd/i18n-parseopt-help' 2012-09-07 11:09:09 -07:00
fsck.c i18n: fsck: mark parseopt strings for translation 2012-08-20 12:23:17 -07:00
gc.c silence git gc --auto --quiet output 2012-09-27 17:57:26 -07:00
grep.c grep: avoid accepting ambiguous revision 2013-01-21 16:57:38 -08:00
hash-object.c i18n: hash-object: mark parseopt strings for translation 2012-08-20 12:23:17 -07:00
help.c Merge branch 'jk/config-parsing-cleanup' 2013-02-04 10:24:50 -08:00
index-pack.c index-pack: fix buffer overflow caused by translations 2013-03-16 22:08:53 -07:00
init-db.c i18n: init-db: mark parseopt strings for translation 2012-08-20 12:23:17 -07:00
log.c Merge branch 'ap/log-mailmap' 2013-01-20 17:06:53 -08:00
ls-files.c Merge branch 'as/check-ignore' 2013-01-23 21:19:10 -08:00
ls-remote.c ls-remote: document the '--get-url' option 2012-09-07 10:58:35 -07:00
ls-tree.c pathspec: save the non-wildcard length part 2012-11-19 13:08:28 -08:00
mailinfo.c Merge branch 'jc/same-encoding' into maint 2012-12-07 14:10:56 -08:00
mailsplit.c mailsplit: sort maildir filenames more cleverly 2013-03-02 22:52:44 -08:00
merge-base.c Merge branch 'jc/merge-bases' 2012-09-11 11:36:05 -07:00
merge-file.c i18n: merge-file: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
merge-index.c Which merge_file() function do you mean? 2012-12-09 23:05:27 -08:00
merge-ours.c
merge-recursive.c
merge-tree.c merge-tree: fix d/f conflicts 2012-12-26 14:46:15 -08:00
merge.c Merge branch 'jc/custom-comment-char' 2013-02-04 10:23:49 -08:00
mktag.c
mktree.c i18n: mktree: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
mv.c i18n: mv: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
name-rev.c i18n: name-rev: mark parseopt strings for translation 2012-08-20 12:23:18 -07:00
notes.c Allow custom "comment char" 2013-01-16 12:48:22 -08:00
pack-objects.c Merge branch 'jk/peel-ref' 2012-10-25 06:42:27 -04:00
pack-redundant.c Fix sizeof usage in get_permutations 2012-12-13 11:13:44 -08:00
pack-refs.c i18n: pack-refs: mark parseopt strings for translation 2012-08-20 12:23:19 -07:00
patch-id.c
prune-packed.c i18n: prune-packed: mark parseopt strings for translation 2012-08-20 12:23:19 -07:00
prune.c Merge branch 'rj/path-cleanup' 2012-09-14 11:53:53 -07:00
push.c Merge branch 'jc/push-reject-reasons' 2013-02-04 10:25:04 -08:00
read-tree.c i18n: read-tree: mark parseopt strings for translation 2012-08-20 12:23:19 -07:00
receive-pack.c Merge branch 'jc/hidden-refs' 2013-02-17 15:25:57 -08:00
reflog.c reflog: use parse_config_key in config callback 2013-01-23 12:58:33 -08:00
remote-ext.c
remote-fd.c
remote.c Fix typo in remote set-head usage 2012-11-26 13:27:45 -08:00
replace.c replace: parse revision argument for -d 2012-11-13 08:34:14 -05:00
rerere.c i18n: rerere: mark parseopt strings for translation 2012-08-20 12:23:19 -07:00
reset.c reset: update documentation to require only tree-ish with paths 2013-01-16 12:50:23 -08:00
rev-list.c Move print_commit_list to libgit.a 2012-10-29 03:08:30 -04:00
rev-parse.c Merge branch 'maint-1.7.11' into maint 2012-09-12 14:08:05 -07:00
revert.c Merge branch 'mz/cherry-pick-cmdline-order' 2012-09-10 15:42:55 -07:00
rm.c Merge branch 'jl/submodule-rm' 2012-11-29 12:52:30 -08:00
send-pack.c push: introduce REJECT_FETCH_FIRST and REJECT_NEEDS_FORCE 2013-01-24 14:37:23 -08:00
shortlog.c Merge branch 'ap/log-mailmap' 2013-01-20 17:06:53 -08:00
show-branch.c i18n: show-branch: mark parseopt strings for translation 2012-08-22 10:58:28 -07:00
show-ref.c Merge branch 'jk/peel-ref' 2012-10-25 06:42:27 -04:00
stripspace.c Allow custom "comment char" 2013-01-16 12:48:22 -08:00
symbolic-ref.c git symbolic-ref --delete $symref 2012-10-21 12:17:38 -07:00
tag.c Allow custom "comment char" 2013-01-16 12:48:22 -08:00
tar-tree.c
unpack-file.c
unpack-objects.c
update-index.c update-index: allow "-h" to also display options 2013-02-23 23:49:33 -08:00
update-ref.c Use imperative form in help usage to describe an action 2012-08-22 12:02:28 -07:00
update-server-info.c i18n: update-server-info: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00
upload-archive.c
var.c
verify-pack.c i18n: verify-pack: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00
verify-tag.c gpg_interface: allow to request status return 2013-02-14 09:30:04 -08:00
write-tree.c i18n: write-tree: mark parseopt strings for translation 2012-08-22 10:58:29 -07:00