linux-kernel - [PATCH 0/4] rwsem: Implement writer lock-stealing

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Date:	Fri,  8 Feb 2013 18:45:33 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	linux-kernel@...r.kernel.org, anton@...ba.org, hpa@...or.com,
	mingo@...nel.org, arjan@...ux.intel.com, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, alex.shi@...el.com,
	yuanhan.liu@...ux.intel.com, dhowells@...hat.com,
	akpm@...ux-foundation.org, tglx@...utronix.de
Subject: [PATCH 0/4] rwsem: Implement writer lock-stealing

This proposal implements writer lock stealing in lib/rwsem.c, just as
Alex Shi's earlier proposal did for the simpler lib/rwsem-spinlock.c

Patches 1 and 2 are small cleanups that I thought I should separate
from the bulk of the changes; Patch 3 is the generic support for write
lock stealing; Patch 4 is the x86 support (optional, only required for
higher performance).

I am not in an ideal position to push this as I will be out of town
starting from the middle of next week. However, I hope that this
proposal will at least get the ball rolling. I did run some basic
testing including David Howell's synchro-test module (as found in
Andrew's -mm tree).

Michel Lespinasse (4):
  rwsem: make the waiter type an enumeration rather than a bitmask
  rwsem: shorter spinlocked section in rwsem_down_failed_common()
  rwsem: implement write lock stealing
  x86 rwsem: avoid taking slow path when stealing write lock

 arch/x86/include/asm/rwsem.h |  28 +++--
 include/linux/rwsem.h        |   2 +
 lib/rwsem.c                  | 252 ++++++++++++++++++++-----------------------
 3 files changed, 139 insertions(+), 143 deletions(-)

-- 
1.8.1
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