Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 11:04:38 +0100] rev 2222
stablerange: fix merge slicing when range has multiple roots
The first element in the bottom set is not necessarly the one with the lowest
revision. We now properly compute and use the minimum value.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 09:04:34 +0100] rev 2221
stablerange: small style fix
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 08:16:00 +0100] rev 2220
merge-slicing: introduce and use "inheritance point" for merge
The first part of the stable sorted list of revision of a merge will shared with
the one of others. This means we can reuse subranges computed from that point to
compute some of the subranges from the merge.
That point is latest point in the stable sorted list where the depth of the
revisions match its index (that means all revision earlier in the stable sorted
list are its ancestors, no dangling unrelated branches exists). This is a bit
expensive to find since we have to walk all the revision, but being able to
reuse subranges in all case (not just regular changesets) provide a massive
speedup so the cost is worth it.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 08:31:10 +0100] rev 2219
stablerange: rearrange the code picking subrange to warm
Same logic, as the previous changesets, we prepare the code before adding merge
support.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 08:20:36 +0100] rev 2218
stablerange: rearrange the reusing logic to prepare to merge
We'll soon be able to reuse some lower range when dealing with merge too. So we
prepare the code for this in advance for clarity.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 06:24:02 +0100] rev 2217
merge-slicing: explain an alternative implementation in a comments
It has a better time complexity so a C implementation would likely out perform
the current implementation
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 06:36:12 +0100] rev 2216
merge-slicing: use reachable roots to filter the various branches
Reachable roots does what we want and have a quite fast C implementation.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 05:51:20 +0100] rev 2215
merge-slicing: simplify various aspect of the code
Especially the case were the bottom have single heads is not more efficiently
handled.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Thu, 23 Mar 2017 14:17:15 +0100] rev 2214
stablerange: soon it will not provide any benefit and it gets in the way
This was a bit strange and memory consuming anyway.
Pierre-Yves David <pierre-yves.david@ens-lyon.org> [Fri, 24 Mar 2017 06:31:32 +0100] rev 2213
revsfromrange: reuse information from the stablesort
We collaborate with the stablesort to store the order that led to a merge. That
way, when we needs to retrieve revision from that merge we can reuse that order.
We might need to filter to only retains ancestors of the merge we care about but
skipping the stablesort safe a large amount of time.