linux-kernel - Re: [PATCH] SLOW_WORK: Move slow

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Date:	Tue, 1 Dec 2009 08:24:52 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	David Howells <dhowells@...hat.com>, akpm@...ux-foundation.org,
	steved@...hat.com, jens.axboe@...cle.com, linux-cachefs@...hat.com,
	nfsv4@...ux-nfs.org, linux-fsdevel@...r.kernel.org,
	cluster-devel@...hat.com, linux-kernel@...r.kernel.org,
	linux-cifs-client@...ts.samba.org
Subject: Re: [PATCH] SLOW_WORK: Move slow_work's proc file to debugfs



On Tue, 1 Dec 2009, Ingo Molnar wrote:
> 
> Nice - thanks for doing this so quickly! It might sound like nitpicking 
> but /proc ABIs tend to be a lot harder to get rid of than debugfs 
> interfaces.

Ok, I applied it, so we'll not switch interfaces (even if they are just 
for debugging) across releases.

Btw David, for things like this, it's _really_ nice to use git rename 
detection. The diffstat (w/ summary) with rename detection looks like 
this:

 Documentation/slow-work.txt                      |    4 ++--
 include/linux/slow-work.h                        |    8 ++++----
 init/Kconfig                                     |    8 ++++----
 kernel/Makefile                                  |    2 +-
 kernel/{slow-work-proc.c => slow-work-debugfs.c} |    4 ++--
 kernel/slow-work.c                               |   18 ++++++++++++------
 kernel/slow-work.h                               |    6 +++---
 7 files changed, 28 insertions(+), 22 deletions(-)
 rename kernel/{slow-work-proc.c => slow-work-debugfs.c} (97%)

which makes it obvious that the changes were really just about renaming. 
Compare to the non-rename-aware one:

 Documentation/slow-work.txt |    4 +-
 include/linux/slow-work.h   |    8 +-
 init/Kconfig                |    8 +-
 kernel/Makefile             |    2 +-
 kernel/slow-work-debugfs.c  |  227 +++++++++++++++++++++++++++++++++++++++++++
 kernel/slow-work-proc.c     |  227 -------------------------------------------
 kernel/slow-work.c          |   18 +++-
 kernel/slow-work.h          |    6 +-
 8 files changed, 253 insertions(+), 247 deletions(-)
 create mode 100644 kernel/slow-work-debugfs.c
 delete mode 100644 kernel/slow-work-proc.c

where you can kind of guess that slow-work-[proc|debugfs].c are largely 
the same, but you don't actually _see_ that it only has four lines of 
changes (and the patch then shows that the changes are just to comments).

			Linus
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