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

  $ . "$TESTDIR/narrow-library.sh"

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  $ hg init repo

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  $ cd repo

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  $ cat << EOF > .hg/store/narrowspec

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  > [include]

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  > path:foo

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  > [exclude]

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  > EOF

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  $ cp .hg/store/narrowspec .hg/narrowspec.dirstate

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  $ echo treemanifest >> .hg/requires

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  $ echo narrowhg-experimental >> .hg/requires

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  $ mkdir -p foo/bar

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  $ echo b > foo/f

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  $ echo c > foo/bar/f

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  $ hg commit -Am hi

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  adding foo/bar/f

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  adding foo/f

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  $ hg debugindex -m

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     rev linkrev nodeid       p1           p2

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       0       0 14a5d056d75a 000000000000 000000000000

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  $ hg debugindex --dir foo

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     rev linkrev nodeid       p1           p2

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       0       0 e635c7857aef 000000000000 000000000000

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  $ hg debugindex --dir foo/

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     rev linkrev nodeid       p1           p2

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       0       0 e635c7857aef 000000000000 000000000000

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  $ hg debugindex --dir foo/bar

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     rev linkrev nodeid       p1           p2

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       0       0 e091d4224761 000000000000 000000000000

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  $ hg debugindex --dir foo/bar/

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     rev linkrev nodeid       p1           p2

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       0       0 e091d4224761 000000000000 000000000000

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  $ hg debugdata -m 0

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  foo\x00e635c7857aef92ac761ce5741a99da159abbbb24t (esc)

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  $ hg debugdata --dir foo 0

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  bar\x00e091d42247613adff5d41b67f15fe7189ee97b39t (esc)

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  f\x001e88685f5ddec574a34c70af492f95b6debc8741 (esc)

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  $ hg debugdata --dir foo/ 0

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  bar\x00e091d42247613adff5d41b67f15fe7189ee97b39t (esc)

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  f\x001e88685f5ddec574a34c70af492f95b6debc8741 (esc)

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  $ hg debugdata --dir foo/bar 0

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  f\x00149da44f2a4e14f488b7bd4157945a9837408c00 (esc)

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  $ hg debugdata --dir foo/bar/ 0

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  f\x00149da44f2a4e14f488b7bd4157945a9837408c00 (esc)