Mercurial > hg-stable
changeset 39519:e4d4361d0bcd
snapshot: try to refine new snapshot base down the chain
There are cases where doing a diff against a snapshot's parent will be shorter
than against the snapshot itself. Reusing snapshot not directly related to the
revision we are trying to store increase this odd.
So once we found a possible candidate, we check the snapshots lower in the
chain.
This will involve extra processing, but this extra processing will only happen
when we are doing building a snapshot, a rare situation.
| author | Boris Feld <boris.feld@octobus.net> |
|---|---|
| date | Fri, 07 Sep 2018 11:17:35 -0400 |
| parents | 993d7e2c8b79 |
| children | 5aef5afa8654 |
| files | mercurial/revlogutils/deltas.py |
| diffstat | 1 files changed, 11 insertions(+), 0 deletions(-) [+] |
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--- a/mercurial/revlogutils/deltas.py Fri Sep 07 11:17:34 2018 -0400 +++ b/mercurial/revlogutils/deltas.py Fri Sep 07 11:17:35 2018 -0400 @@ -647,6 +647,17 @@ good = yield candidates if good is not None: break + + # if we have a refinable value, try to refine it + if good is not None and good not in (p1, p2) and revlog.issnapshot(good): + # refine snapshot down + previous = None + while previous != good: + previous = good + base = revlog.deltaparent(good) + if base == nullrev: + break + good = yield (base,) # we have found nothing yield None