On Tue, Jun 04, 2013 at 12:14:21PM -0700, Junio C Hamano wrote:

> > diff --git a/commit.h b/commit.h
> > index 67bd509..de07525 100644
> > --- a/commit.h
> > +++ b/commit.h
> > @@ -17,6 +17,7 @@ struct commit {
> >     void *util;
> >     unsigned int indegree;
> >     unsigned long date;
> > +   unsigned long author_date;
> While walking we keep many of them in-core, and 8-byte each for each
> commit objects add up.  We do not want to make "struct commit" any
> larger than it already is.

Yeah, I had the same thought. Maybe this is a good candidate to build on
top of the jk/commit-info slab experiment. The topo-sort could allocate
an extra slab for author-date (or even expand the indegree slab to hold
both indegree and author date), use it during the sort, and then free it

Elliott: you can see the relevant changes to the topo-sort in commit
96c4f4a (commit: allow associating auxiliary info on-demand,

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