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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# Dummy extension to define a namespace containing revision names

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from mercurial import namespaces

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def reposetup(ui, repo):

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    names = {b'r%d' % rev: repo[rev].node() for rev in repo}

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    namemap = lambda r, name: names.get(name)

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    nodemap = lambda r, node: [b'r%d' % repo[node].rev()]

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    ns = namespaces.namespace(

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        b'revnames',

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        templatename=b'revname',

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        logname=b'revname',

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        listnames=lambda r: names.keys(),

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        namemap=namemap,

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        nodemap=nodemap,

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    )

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    repo.names.addnamespace(ns)