On Wed, Aug 29, 2012 at 08:53:49PM -0700, Junio C Hamano wrote:

> Jeff King <p...@peff.net> writes:
> > I wonder if you can
> > define the weight as a recursive function of the parents.
> I do not think we can.  A merge Z between X (that has N commits
> behind it) and Y (that has M commits behind it) has at most N+M+1
> commits behind it (counting itself), but we cannot tell how many
> among these N and M are shared.
> > That would double-count "A" and "B" in this example. But maybe there is
> > a clever way to define it that avoids that.
> We've dealt with this issue long time ago when we optimized the
> bisection count, which involves exactly the same issue.

OK. I didn't think too hard about it, so I'll trust you that it is not
easy. I wonder if using the generation number would be another way of
defining "oldest" that would be easier to calculate.

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