Mercurial > hg
diff mercurial/context.py @ 32069:a457da5296a5 stable
context: optimize linkrev adjustment in blockancestors() (issue5538)
We set parent._descendantrev = child.rev() when walking parents in
blockancestors() so that, when linkrev adjustment is perform for these, it
starts from a close descendant instead of possibly topmost introrev. (See
`self._adjustlinkrev(self._descendantrev)` in filectx._changeid().)
This is similar to changeset c82d88dfaf59, which added a "f._changeid"
instruction in annotate() for the same purpose.
However, here, we set _descendantrev explicitly instead of relying on the
'_changeid' cached property being accessed (with effect to set _changeid
attribute) so that, in _parentfilectx() (called from parents()), we go through
`if '_changeid' in vars(self) [...]` branch in which instruction
`fctx._descendantrev = self.rev()` finally appears and does what we want.
With this, we can roughly get a 3x speedup (including in example of issue5538
from mozilla-central repository) on usage of followlines revset (and
equivalent hgweb request).
author | Denis Laxalde <denis.laxalde@logilab.fr> |
---|---|
date | Mon, 24 Apr 2017 18:33:23 +0200 |
parents | befefdd34cf8 |
children | 2cfdf5241096 c850f0ed54c1 |
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--- a/mercurial/context.py Mon Apr 24 17:13:24 2017 +0200 +++ b/mercurial/context.py Mon Apr 24 18:33:23 2017 +0200 @@ -1214,6 +1214,10 @@ # introduced in this revision; no need to go futher in this # branch. continue + # Set _descendantrev with 'c' (a known descendant) so that, when + # _adjustlinkrev is called for 'p', it receives this descendant + # (as srcrev) instead possibly topmost introrev. + p._descendantrev = c.rev() visit[p.linkrev(), p.filenode()] = p, linerange1 if inrange: yield c, linerange2