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

>  $ 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
> $

> Tomas Carnecky<tomas.carnecky@gmail.com>  writes:
>
>>   $ 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
>> $
>
> Add --full-history so that you would get _all_ possible explanation of the
> history, perhaps?
>
> In a history with this shape:
>
>      ---A---B---C---D---E
>              \     /
>               F---G
>
> suppose that
>
>   - commit F introduces a path;
>   - commit G removes the path;
>   - no other commit has the path in question.
>
> Without --full-history, "log E -- path" is asked to give "_one_ possible
> way to explain the current state of path in E" (iow, "why there is nothing
> there right now at E?").
>
> Two explanations are possible even in this vastly simplified toy history.
>
>   - It didn't exist in A, and none of the subsequent commits B, C, D that
>     lead to E did anything to change that.
>
>   - F added it, but G changed mind and removed it.
>
> When "log" encounters a merge commit while traversing the history
> backwards (in this case D) with paths limiter, if there is a commit among
> its parent whose tree matches its tree with respect to the paths, side
> branches leading to all the other parents are culled and only that one
> history is followed to explain the history.  In this case, neither C or D
> has the path, so their trees with respect to the paths limiter match, and
> git doesn't follow the side branch that has F and G without
> --full-history.

> Dnia 22 grudnia 2009 11:04 	Tomas Carnecky<tomas.carnecky@gmail.com>  napisał(a):
>
>>    $ 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
>> --
> Try
>
> $ git log --follow -- Documentation/perf_counter
>