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repoview: improve compute staticblockers perf...
repoview: improve compute staticblockers perf Previously we would compute the repoview's static blockers by finding all the children of hidden commits that were not hidden. This was O(number of commits since first hidden change) since 'children' requires walking every commit from tip until the first hidden change. The new algorithm walks all heads down until it sees a public commit. This makes the computation O(number of draft) commits, which is much faster in large repositories with a large number of commits and a low number of drafts. On a large repo with 1000+ obsolete markers and the earliest draft commit around tip~200000, this improves computehidden perf by 200x (2s to 0.01s).
Mads Kiilerich - - Load All Authors

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revisions.txt
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/ mercurial / help / revisions.txt
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Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip,
-2 denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision
identifier.
A hexadecimal string less than 40 characters long is treated as a
unique revision identifier and is referred to as a short-form
identifier. A short-form identifier is only valid if it is the prefix
of exactly one full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A
bookmark is a movable pointer to a revision. A tag is a permanent name
associated with a revision. A branch name denotes the tipmost open branch head
of that branch - or if they are all closed, the tipmost closed head of the
branch. Bookmark, tag, and branch names must not contain the ":" character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the
revision of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first
parent.