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

Taylor Blau [off-list ref] writes:

quoted

quoted

There is some overhead to invoke the hook and talk to watchman, but
I'd expect that to be dwarfed by not having to issue O(# files)
syscalls.

"invoke the hook"---is that a pipe+fork+exec, or something else that
is far lighter-weight?

The former; see 'fsmonitor.c:query_fsmonitor()'.

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?