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Re: [PATCH v3] rev-list: exclude promisor objects at walk time

Jeff King <peff@xxxxxxxx> writes:

> On Wed, Apr 10, 2019 at 12:14:41AM +0900, Junio C Hamano wrote:
>> I've dealt with the stray double-sign-off locally, but is there
>> anything else planned for v4 or later?  Is this performance-only
>> change, or does it have an externally observable behaviour change
>> that we can easily add to our test suite?
> I am OK if we do not include it, but even if this is "just" a
> performance-only change, we can always add to our perf regression suite.

Hmph, that does not say much about a possible change in behaviour in
corner cases you guys were discuussing near the beginning of the
thread when an object can be reached from both a non-promisor and a
promisor object, does it?

Shouldn't we at least tweak the log message to record that we were
aware of the possibility even though we couldn't readily come up
with a case where this optimization breaks things?  I suspect that
it would help the next person who needs to deal with a possible
regression coming from this change to understand the problem better
and hopefully faster.