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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
