.arcconfig
author Simon Sapin <simon.sapin@octobus.net>
Tue, 08 Feb 2022 15:51:52 +0100
changeset 48950 11c0411bf4e2
parent 44128 ff396501e841
permissions -rw-r--r--
dirstate-tree: optimize HashMap lookups with raw_entry_mut This switches to using `HashMap` from the hashbrown crate, in order to use its `raw_entry_mut` method. The standard library’s `HashMap` is also based on this same crate, but `raw_entry_mut` is not yet stable there: https://github.com/rust-lang/rust/issues/56167 Using version 0.9 because 0.10 is yanked and 0.11 requires Rust 1.49 This replaces in `DirstateMap::get_or_insert_node` a call to `HashMap<K, V>::entry` with `K = WithBasename<Cow<'on_disk, HgPath>>`. `entry` takes and consumes an "owned" `key: K` parameter, in case a new entry ends up inserted. This key is converted by `to_cow` from a value that borrows the `'path` lifetime. When this function is called by `Dirstate::new_v1`, `'path` is in fact the same as `'on_disk` so `to_cow` can return an owned key that contains `Cow::Borrowed`. For other callers, `to_cow` needs to create a `Cow::Owned` and thus make a costly heap memory allocation. This is wasteful if this key was already present in the map. Even when inserting a new node this is typically the case for its ancestor nodes (assuming most directories have numerous descendants). Differential Revision: https://phab.mercurial-scm.org/D12317
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{
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    "conduit_uri": "https://phab.mercurial-scm.org/api",
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    "phabricator.uri": "https://phab.mercurial-scm.org/",
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    "repository.callsign": "HG",
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    "arc.land.onto.default": "@",
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    "base": "hg:.^"
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}