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

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test sparse

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  $ hg init myrepo

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  $ cd myrepo

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  $ cat >> $HGRCPATH <<EOF

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  > [extensions]

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  > sparse=

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  > purge=

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  > strip=

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  > rebase=

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  > EOF

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  $ echo a > index.html

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  $ echo x > data.py

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  $ echo z > readme.txt

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  $ cat > base.sparse <<EOF

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  > [include]

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  > *.sparse

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  > EOF

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  $ hg ci -Aqm 'initial'

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  $ cat > webpage.sparse <<EOF

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  > %include base.sparse

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  > [include]

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  > *.html

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  > EOF

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  $ hg ci -Aqm 'initial'

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Clear rules when there are includes

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  $ hg debugsparse --include *.py

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  $ ls -A

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  .hg

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  data.py

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  $ hg debugsparse --clear-rules

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  $ ls -A

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  .hg

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  base.sparse

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  data.py

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  index.html

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  readme.txt

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  webpage.sparse

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Clear rules when there are excludes

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  $ hg debugsparse -X base.sparse -X webpage.sparse

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  $ ls -A

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  .hg

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  data.py

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  index.html

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  readme.txt

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  $ hg debugsparse --clear-rules

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  $ ls -A

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  .hg

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  base.sparse

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  data.py

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  index.html

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  readme.txt

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  webpage.sparse

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Clearing rules should not alter profiles

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  $ hg debugsparse --enable-profile webpage.sparse

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  $ ls -A

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  .hg

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  base.sparse

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  index.html

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  webpage.sparse

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  $ hg debugsparse --include *.py

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  $ ls -A

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  .hg

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  base.sparse

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  data.py

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  index.html

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  webpage.sparse

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  $ hg debugsparse --clear-rules

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  $ ls -A

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  .hg

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  base.sparse

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  index.html

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  webpage.sparse