linux-kernel - [PATCH RFC 0/2] qrwlock: Introducing a queue read/write lock implementation

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Date:	Fri, 12 Jul 2013 21:34:07 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>
Cc:	Waiman Long <Waiman.Long@...com>, linux-arch@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Weinberger <richard@....at>,
	Catalin Marinas <catalin.marinas@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: [PATCH RFC 0/2] qrwlock: Introducing a queue read/write lock implementation

This patch set introduces a queue-based read/write implementation that
is both faster and fairer than the current read/write lock. It can
also be used as a replacement for ticket spinlocks that are highly
contended if lock size increase is not an issue.

There is no change in the interface. By just replacing the current
read/write lock with the queue read/write lock, we can have a faster
and more deterministic system.

Signed-off-by: Waiman Long <Waiman.Long@...com>

Waiman Long (2):
  qrwlock: A queue read/write lock implementation
  x86 qrwlock: Enable x86 to use queue read/write lock

 arch/x86/Kconfig                      |    3 +
 arch/x86/include/asm/spinlock.h       |    2 +
 arch/x86/include/asm/spinlock_types.h |    4 +
 include/asm-generic/qrwlock.h         |  124 +++++++++++++++++
 lib/Kconfig                           |   11 ++
 lib/Makefile                          |    1 +
 lib/qrwlock.c                         |  246 +++++++++++++++++++++++++++++++++
 7 files changed, 391 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-generic/qrwlock.h
 create mode 100644 lib/qrwlock.c

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