From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff King <peff@peff.net>
Subject: Re: git status: small difference between stating whole repository
 and small subdirectory
Date: Fri, 17 Feb 2012 17:29:12 -0500
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Cc: Piotr Krukowiecki <piotr.krukowiecki@gmail.com>,
	Thomas Rast <trast@inf.ethz.ch>,
	Git Mailing List <git@vger.kernel.org>,
	Nguyen Thai Ngoc Duy <pclouds@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
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On Fri, Feb 17, 2012 at 02:25:25PM -0800, Junio C Hamano wrote:

> Jeff King <peff@peff.net> writes:
> 
> > That being said, we do have an index extension to store the tree sha1 of
> > whole directories (i.e., we populate it when we write a whole tree or
> > subtree into the index from the object db, and it becomes invalidated
> > when a file becomes modified). This optimization is used by things like
> > "git commit" to avoid having to recreate the same sub-trees over and
> > over when creating tree objects from the index. But we could also use it
> > here to avoid having to even read the sub-tree objects from the object
> > db.
> 
> Like b65982b (Optimize "diff-index --cached" using cache-tree, 2009-05-20)
> perhaps?

That's what I get for speaking before running "git log".

So yeah, we may be about as reasonably fast as we can go. Or maybe that
optimization isn't kicking in for some reason. I think going further
would require Piotr to do more profiling.

-Peff