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Re: [PATCH 0/3] Make add_missing_tags() linear

"Derrick Stolee via GitGitGadget" <gitgitgadget@xxxxxxxxx> writes:

> Add a new method in commit-reach.c called get_reachable_subset() which does
> a many-to-many reachability test. Starting at the 'from' commits, walk until
> the generation is below the smallest generation in the 'to' commits, or all
> 'to' commits have been discovered. This performs only one commit walk for
> the entire add_missing_tags() method, giving linear performance in the worst
> case.


I think in_merge_bases_many() was an attempt to do one half of this
(i.e. it checks only one 'to' against main 'from' to see if any of
them reach).  I wonder why we didn't extend it to multiple 'to' back
when we invented it.

In any case, good to see this code optimized.