From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 30 Nov 2011 18:27:26 GMT
Subject: Re: log: option "--follow" not the default for a single file?
Message-ID: <7vipm1qxdd.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20111130063743.GB5317@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

>   2. It can be slower than a regular traversal, since we have to do
>      rename detection whenever we see a deletion. In practice I don't
>      think it is much slower, though (mainly because files don't get
>      moved all that much).

There is no difference between a regular traversal and a follow traversal
while the path is still there. When a path disappear during a regular
traversal, most likely the remaining traversal will yield nothing but the
user has already seen what is there to see. If a follow traversal was in
use, the user has seen the same as the regular traversal up to that point,
we spend a bit of time in rename detection, and then we start showing the
result of the traversal using an updated pathspec. I doubt that "slowness"
is an issue here.