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Message-ID: <alpine.LFD.2.00.0912010821170.2872@localhost.localdomain>
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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