tags-cache: directly perform a monimal walk for hgtagsfnodescache warming We do something narrower than the path retrieving data. So lets use dedicated code instead. This provides further useful speedup: ### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog # benchmark.name = hg.debug.debug-update-cache # bin-env-vars.hg.flavor = default # bin-env-vars.hg.py-re2-module = default # benchmark.variants.pre-state = warm before-this-series: 19.947581 skip-fnode-filter: 18.916804 (-5.17%, -1.03) use-rev-num: 17.493725 (-12.30%, -2.45) this-changesets: 15.919466 (-20.19%, -4.03)

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Test null revisions (node 0000000000000000000000000000000000000000, aka rev -1)

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in various circumstances.

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Make an empty repo:

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  $ hg init a

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  $ cd a

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  $ hg files -r 0000000000000000000000000000000000000000

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  [1]

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  $ hg files -r .

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  [1]

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Add an empty commit (this makes the changelog refer to a null manifest node):

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  $ hg commit -m "init" --config ui.allowemptycommit=true

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  $ hg files -r .

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  [1]

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Strip that empty commit (this makes the changelog file empty, as opposed to missing):

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  $ hg --config 'extensions.strip=' strip . > /dev/null

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  $ hg files -r .

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  [1]