From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH] Add --show-touched option to show "diff --git" line when contents are unchanged
Date: Mon, 06 Aug 2007 13:34:17 -0700
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Cc: git@vger.kernel.org, David Kastrup <dak@gnu.org>
To: Matthieu Moy <Matthieu.Moy@imag.fr>
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Matthieu Moy <Matthieu.Moy@imag.fr> writes:

> Unfortunately, the patch solves the "large and irrelevant output" of
> git-diff, but not the performance problem (see the rest of the thread,
> I failed to convince Junio that updating the index was a performance
> improvement while keeping the same user semantics).

That's what update-index --refresh (or status if you insist) are
for, and the coalmine canary you are so dead set to kill are
helping you realize the need for running.