rhg: make rhg recognise it supports zstd compression for revlogs It already did, but was not aware of it. Differential Revision: https://phab.mercurial-scm.org/D10324

match: convert O(n) to O(log n) in exactmatcher.visitchildrenset When using narrow, during rebase this is called (at least) once per directory in the set of files in the commit being rebased. Every time it's called, we did the set arithmetic (now extracted and cached), which was probably pretty cheap but not necessary to repeat each time, looped over every item in the matcher and kept things that started with the directory we were querying. With very large narrowspecs, and a commit that touched a file in a large number of directories, this was slow. In a pathological repo, the rebase of a single commit (that touched over 17k files, I believe in approximately as many directories) with a narrowspec that had >32k entries took 8,246s of profiled time, with 5,007s of that spent in visitchildrenset (transitively). With this change, the time spent in visitchildrenset is less than 34s (which is where my profile cut off). Most of the remaining time was network access due to our custom remotefilelog-based setup not properly prefetching. Differential Revision: https://phab.mercurial-scm.org/D10294

exthelper: improve docs to indicate what module vars are needed I recently tried creating an extension "from scratch" using exthelper, and it wasn't obvious that you needed these. I believe that a careful reading of one of the comments would tell you that they were required, but it's easy to miss and having the examples be "complete" is helpful. Differential Revision: https://phab.mercurial-scm.org/D10295