status: prefer relative paths in Rust code … when the repository root is under the current directory, so the kernel needs to traverse fewer directory in every call to `read_dir` or `symlink_metadata`. Better yet would be to use libc functions like `openat` and `fstatat` to remove such repeated traversals entirely, but the standard library does not provide APIs based on those. Maybe with a crate like https://crates.io/crates/openat instead? Benchmarks of `rhg status` show that this patch is neutral in some configurations, and makes the command up to ~20% faster in others. Below is semi-arbitrary subset of results. The four numeric columns are: time (in seconds) with this changeset’s parent, time with this changeset, time difference (negative is better), time ratio (less than 1 is better). ``` mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97) mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97) mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00) mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82) mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82) mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96) mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95) mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78) mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81) mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78) mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82) mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96) mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98) mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82) mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82) netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99) netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87) ``` Differential Revision: https://phab.mercurial-scm.org/D12175

     1

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init a

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  $ cd a

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  $ echo 'base' > base

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  $ hg ci -Ambase

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  adding base

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  $ hg qnew -mmqbase mqbase

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  $ hg qrename mqbase renamed

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  $ mkdir .hg/patches/foo

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  $ hg qrename renamed foo

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  $ hg qseries

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  foo/renamed

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  $ ls .hg/patches/foo

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  renamed

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  $ mkdir .hg/patches/bar

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  $ hg qrename foo/renamed bar

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  $ hg qseries

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  bar/renamed

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  $ ls .hg/patches/bar

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  renamed

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  $ hg qrename bar/renamed baz

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  $ hg qseries

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  baz

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  $ ls .hg/patches/baz

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  .hg/patches/baz

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  $ hg qrename baz new/dir

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  $ hg qseries

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  new/dir

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  $ ls .hg/patches/new/dir

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  .hg/patches/new/dir

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  $ cd ..

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Test patch being renamed before committed:

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  $ hg init b

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  $ cd b

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  $ hg qinit -c

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  $ hg qnew x

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  $ hg qrename y

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  $ hg qcommit -m rename

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  $ cd ..

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Test overlapping renames (issue2388)

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  $ hg init c

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  $ cd c

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  $ hg qinit -c

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  $ echo a > a

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  $ hg add

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  adding a

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  $ hg qnew patcha

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  $ echo b > b

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  $ hg add

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  adding b

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  $ hg qnew patchb

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  $ hg ci --mq -m c1

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  $ hg qrename patchb patchc

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  $ hg qrename patcha patchb

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  $ hg st --mq

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  M patchb

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  M series

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  A patchc

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  R patcha

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  $ cd ..

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Test renames with mq repo (issue2097)

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  $ hg init issue2097

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  $ cd issue2097

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  $ hg qnew p0

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  $ (cd .hg/patches && hg init)

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  $ hg qren p0 p1

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  $ hg debugstate --mq

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  $ hg ci --mq -mq0

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  nothing changed

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  [1]

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  $ cd ..

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Test renaming to a folded patch (issue3058)

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  $ hg init issue3058

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  $ cd issue3058

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  $ hg init --mq

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  $ echo a > a

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  $ hg add a

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  $ hg qnew adda

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  $ echo b >> a

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  $ hg qnew addb

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  $ hg qpop

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  popping addb

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  now at: adda

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  $ hg ci --mq -m "save mq"

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  $ hg qfold addb

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  $ hg qmv addb

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  $ cat .hg/patches/addb

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  # HG changeset patch

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  # Parent  0000000000000000000000000000000000000000

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  diff -r 000000000000 a

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  --- /dev/null	* (glob)

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  +++ b/a	* (glob)

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  @@ -0,0 +1,2 @@

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  +a

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  +b

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  $ cd ..

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