Where did Documentation/perf_counter disappear from linux-2.6-tip.git ?

[Tomas Carnecky <tomas.carnecky@gmail.com>]

  $ git --version
git version 1.6.6.rc4

# Documentation/perf_counter is missing from the master branch, so first 
let's find
# out what the last commit was that touched that subdirectory:
$ git log --all -1 -- Documentation/perf_counter
commit 436224a6d8bb3e29fe0cc18122f8d1f593da67b8
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date:   Tue Jun 2 21:02:36 2009 +0200
...
M       Documentation/perf_counter/builtin-report.c

# Great, let's look in which branch that commit is
$ git branch --contains 436224a6d8bb3e29fe0cc18122f8d1f593da67b8
* master

# So, let's look at the log of master and limit it to that subdirectory:
$ git log master -- Documentation/perf_counter
$

# Damn, that doesn't make any sense. In commit 43622 there were files in 
that subdirectory, in master they have gone missing and yet log doesn't 
show any commit touching that subdirectory?
# Let's try something different:
$ git log --diff-filter=D --name-status --all -- Documentation/perf_counter
...

# Ah, now we're getting somewhere, but still no sight of a commit which 
removed for example Documentation/perf_counter/.gitignore
# I'm sure I'm probably just missing a tiny little switch for git-log. I 
also tried other combination of name-status, diff-filter etc, but soon 
after gave up.

tom