revlog: add a Rust implementation of `headrevsdiff`...

revlog: add a Rust implementation of `headrevsdiff` Python implementation of `headrevsdiff` can be very slow in the worst case compared with the `heads` computation it replaces, since the latter is done in Rust. Even the average case of this Python implementation is still noticeable in the profiles. This patch makes the computation much much faster by doing it in Rust.

Arseniy Alekseyev -


            r52290:b01e7d97

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Name	Size	Modified	Last Commit	Author
/ mercurial / thirdparty / cbor
cbor2
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LICENSE.txt	Loading ...
README.rst	Loading ...
__init__.py	Loading ...

mercurial/thirdparty/cbor/README.rst

This library provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 7049) serialization format.

There exists another Python CBOR implementation (cbor) which is faster on CPython due to its C extensions. On PyPy, cbor2 and cbor are almost identical in performance. The other implementation also lacks documentation and a comprehensive test suite, does not support most standard extension tags and is known to crash (segfault) when passed a cyclic structure (say, a list containing itself).

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