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

From: Michel Lespinasse
Date: Fri Feb 08 2013 - 21:45:46 EST

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(-)

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