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phases: large rewrite on retract boundary...
phases: large rewrite on retract boundary The new code is still pure Python, so we still have room to going significantly faster. However its complexity of the complex part is `O(|[min_new_draft, tip]|)` instead of `O(|[min_draft, tip]|` which should help tremendously one repository with old draft (like mercurial-devel or mozilla-try). This is especially useful as the most common "retract boundary" operation happens when we commit/rewrite new drafts or when we push new draft to a non-publishing server. In this case, the smallest new_revs is very close to the tip and there is very few work to do. A few smaller optimisation could be done for these cases and will be introduced in later changesets. We still have iterate over large sets of roots, but this is already a great improvement for a very small amount of work. We gather information on the affected changeset as we go as we can put it to use in the next changesets. This extra data collection might slowdown the `register_new` case a bit, however for register_new, it should not really matters. The set of new nodes is either small, so the impact is negligible, or the set of new nodes is large, and the amount of work to do to had them will dominate the overhead the collecting information in `changed_revs`. As this new code compute the changes on the fly, it unlock other interesting improvement to be done in later changeset.
Martin von Zweigbergk - - Load All Authors

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mergestate.txt
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The active mergestate is stored in ``.hg/merge`` when a merge is triggered
by commands like ``hg merge``, ``hg rebase``, etc. until the merge is
completed or aborted to track the 3-way merge state of individual files.
The contents of the directory are:
Conflicting files
-----------------
The local version of the conflicting files are stored with their
filenames as the hash of their paths.
state
-----
This mergestate file record is used by hg version prior to 2.9.1
and contains less data than ``state2``. If there is no contradiction
with ``state2``, we can assume that both are written at the same time.
In this case, data from ``state2`` is used. Otherwise, we use ``state``.
We read/write both ``state`` and ``state2`` records to ensure backward
compatibility.
state2
------
This record stores a superset of data in ``state``, including new kinds
of records in the future.
Each record can contain arbitrary content and has an associated type. This
`type` should be a letter. If `type` is uppercase, the record is mandatory:
versions of Mercurial that don't support it should abort. If `type` is
lowercase, the record can be safely ignored.
Currently known records:
| * L: the node of the "local" part of the merge (hexified version)
| * O: the node of the "other" part of the merge (hexified version)
| * F: a file to be merged entry
| * C: a change/delete or delete/change conflict
| * P: a path conflict (file vs directory)
| * f: a (filename, dictionary) tuple of optional values for a given file
| * X: unsupported mandatory record type (used in tests)
| * x: unsupported advisory record type (used in tests)
| * l: the labels for the parts of the merge.
Merge record states (indexed by filename):
| * u: unresolved conflict
| * r: resolved conflict
| * pu: unresolved path conflict (file conflicts with directory)
| * pr: resolved path conflict
The resolve command transitions between 'u' and 'r' for conflicts and
'pu' and 'pr' for path conflicts.
This format is a list of arbitrary records of the form:
[type][length][content]
`type` is a single character, `length` is a 4 byte integer, and
`content` is an arbitrary byte sequence of length `length`.
Mercurial versions prior to 3.7 have a bug where if there are
unsupported mandatory merge records, attempting to clear out the merge
state with hg update --clean or similar aborts. The 't' record type
works around that by writing out what those versions treat as an
advisory record, but later versions interpret as special: the first
character is the 'real' record type and everything onwards is the data.