On Fri, May 30, 2014 at 6:41 AM, Jeff King <p...@peff.net> wrote:
> On Fri, May 30, 2014 at 06:24:30AM +0700, Duy Nguyen wrote:
>> >> I wonder if we can get away without SSE code by saving stat info of
>> >> the packed-refs version that we have verified. When we read pack-refs,
>> >> if stat info matches, skip check_refname_component(). Assuming that
>> >> pack-refs does not change often, of course.
>> >
>> > Can you elaborate a bit more?
>> The first time we read packed_refs, check_refname_format() is called
>> in read_packed_refs()->create_ref_entry() as usual. If we find no
>> problem, we store packed_refs stat() info in maybe packed_refs.stat.
>> Next time we read packed_refs, if packed_refs.stat is there and
>> indicates that packed_refs has not changed, we can make
>> create_ref_entry() ignore check_refname_format() completely.
> I'm confused. Why would we re-open packed-refs at all if the stat
> information hasn't changed?

No, not in the same process. In the next run.

> read_packed_refs is only called from get_packed_ref_cache, and we only
> do so if !refs->packed. And refs->packed is only NULL if we haven't read
> the file yet, or it is stat-dirty.
> If that is working as intended, then we should generally only open and
> read packed-refs once per invocation of git.
> -Peff

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