linux-kernel - Re: [RFC 0/8] Move locking primitives into kernel/locking/

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Message-ID: <20131106142921.GJ18245@linux.vnet.ibm.com>
Date:	Wed, 6 Nov 2013 06:29:21 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	oleg@...hat.com, dhowells@...hat.com, willy@...ux.intel.com,
	tglx@...utronix.de, rostedt@...dmis.org, airlied@...il.com,
	maarten.lankhorst@...onical.com, walken@...gle.com,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC 0/8] Move locking primitives into kernel/locking/

On Tue, Nov 05, 2013 at 01:10:44PM +0100, Peter Zijlstra wrote:
> Hi all,
> 
> During Kernel Summit Dave mentioned that there wasn't a clear maintainer for
> locking bits.
> 
> To remedy this Ingo suggested gathering all the various locking primitives and
> lockdep into a single place: kernel/locking/.
> 
> I would further like to propose a MAINTAINERS entry like:
> 
> LOCKING
> M:      Ingo Molnar <mingo@...hat.com>
> M:      Peter Zijlstra <peterz@...radead.org>
> M:	Oleg Nesterov <oleg@...hat.com>
> M:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> M:	Linus Torvalds <torvalds@...ux-foundation.org>
> T:      git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core
> S:      Maintained
> F:      kernel/locking/
> 
> Because for most 'fun' locking discussions we usually end up with at least
> those people anyway :-)
> 
> Comments?

OK, I am in.

How are we organizing this?  I could imagine divvying up the various
types of locks, having a minimum number of reviews or acks coupled
with a maximum review time, or just requiring the full set of reviews
and acks given the criticality of locking code.  Other approaches?

						Thanx, Paul

> ---
>  kernel/lglock.c                    |   89 
>  kernel/lockdep.c                   | 4257 -----------------------------------
>  kernel/lockdep_internals.h         |  170 -
>  kernel/lockdep_proc.c              |  683 -----
>  kernel/lockdep_states.h            |    9 
>  kernel/mutex-debug.c               |  110 
>  kernel/mutex-debug.h               |   55 
>  kernel/mutex.c                     |  960 -------
>  kernel/mutex.h                     |   48 
>  kernel/rtmutex-debug.c             |  187 -
>  kernel/rtmutex-debug.h             |   33 
>  kernel/rtmutex-tester.c            |  420 ---
>  kernel/rtmutex.c                   | 1060 --------
>  kernel/rtmutex.h                   |   26 
>  kernel/rtmutex_common.h            |  126 -
>  kernel/rwsem.c                     |  157 -
>  kernel/semaphore.c                 |  263 --
>  kernel/spinlock.c                  |  399 ---
>  lib/percpu-rwsem.c                 |  165 -
>  lib/rwsem-spinlock.c               |  296 --
>  lib/rwsem.c                        |  293 --
>  lib/spinlock_debug.c               |  302 --
>  kernel/locking/Makefile            |   25 
>  kernel/locking/lglock.c            |   89 
>  kernel/locking/lockdep.c           | 4257 +++++++++++++++++++++++++++++++++++
>  kernel/locking/lockdep_internals.h |  170 +
>  kernel/locking/lockdep_proc.c      |  683 +++++
>  kernel/locking/lockdep_states.h    |    9 
>  kernel/locking/mutex-debug.c       |  110 
>  kernel/locking/mutex-debug.h       |   55 
>  kernel/locking/mutex.c             |  960 +++++++
>  kernel/locking/mutex.h             |   48 
>  kernel/locking/percpu-rwsem.c      |  165 +
>  kernel/locking/rtmutex-debug.c     |  187 +
>  kernel/locking/rtmutex-debug.h     |   33 
>  kernel/locking/rtmutex-tester.c    |  420 +++
>  kernel/locking/rtmutex.c           | 1060 ++++++++
>  kernel/locking/rtmutex.h           |   26 
>  kernel/locking/rtmutex_common.h    |  126 +
>  kernel/locking/rwsem-spinlock.c    |  296 ++
>  kernel/locking/rwsem-xadd.c        |  293 ++
>  kernel/locking/rwsem.c             |  157 +
>  kernel/locking/semaphore.c         |  263 ++
>  kernel/locking/spinlock.c          |  399 +++
>  kernel/locking/spinlock_debug.c    |  302 ++
>  kernel/Makefile                    |   22 
>  kernel/futex.c                     |    2 
>  lib/Makefile                       |    4 
>  48 files changed, 10138 insertions(+), 10131 deletions(-)
> 
> 
> 

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