Re: [PATCH 1/4] fsmonitor: use fsmonitor data in `git diff`

It brings us back to the "overhead of how many lstat(2) takes us
closer to the overhead of a single pipe+fork+exec plus reading from
the pipe", doesn't it?

I will add a benchmark for a `git diff -- <pathspec>`

Somewhat unfortunately, yes. Hopefully any user that cares to use
fsmonitor has enough files in their repository that a pipe+fork+exec is
still faster than however many lstats they would have needed otherwise.

Of course, finding out what that number is is still interesting...

I can try to do some manual testing to figure this out. Doesn't seem like the
type of thing we'd want to add to the benchmark, as it would involve running
git diff on a variety of pathspec workloads

--Nipunn