This series contain 2 follow-up patches to alleviate the performance regression found in the page_fault1 test of the will-it-scale benchmark. This does not recover all the lost performance, but reclaim a sizeable portion of it.
The regression was found on an Intel system. I have run the test on an AMD system. The regression wasn't seen there. There are only minor variations in performance. Perhaps the page fault path is quite different between Intel and AMD systems. Waiman Long (2): locking/rwsem: Clarify usage of owner's nonspinaable bit locking/rwsem: Adaptive disabling of reader optimistic spinning include/linux/rwsem.h | 2 +- kernel/locking/lock_events_list.h | 9 +- kernel/locking/rwsem.c | 178 +++++++++++++++++++++--------- 3 files changed, 131 insertions(+), 58 deletions(-) -- 2.18.1
