revlog: speed up isancestor Currently, it is implemented on top of commonancestorsheads. Implement it on top of reachableroots instead, as reachableroots could stop walking the graph much sooner than commonancestorsheads. Measuring repo.changelog.isancestorrev on two revisions in a private repository: before: ! wall 0.005175 comb 0.010000 user 0.010000 sys 0.000000 (best of 550) after : ! wall 0.000072 comb 0.000000 user 0.000000 sys 0.000000 (best of 36199) When hg does this kind of operations 1500 times in pull -> bookmarks.comparebookmarks -> bookmarks.validdest, that's 11s that drop from the --profile output. Differential Revision: https://phab.mercurial-scm.org/D6506

dagop: fix documentation of reachableroots The previous revset couldn't be correct as it is symmetric in <roots> and <heads>, but reachableroots has no such symmetry. It makes a difference with for instance reachableroots(2, 3) where 2 and 3 are both children of 1. Differential Revision: https://phab.mercurial-scm.org/D6505

phabricator: add --blocker argument to phabsend to specify blocking reviewers The way to signal to Conduit that a reviewer is considered blocking is just to wrap their PHID in "blocking()" when including it in the list of PHIDs passed to `reviewers.add`. arc doesn't have a --blocker, instead one is supposed to append a '!' to the end of reviewer names (I think reviewers are usually added in an editor rather than the command line, where '!'s can be more hazardous). moz-phab (Mozilla's arcanist wrapper) does have a --blocker argument, and being explicit like this is also more discoverable. Even `arc diff`'s help doesn't seem to mention the reviewer! syntax. Differential Revision: https://phab.mercurial-scm.org/D6512