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...ext4 FS %change ------ ------ ------- ------- ------- PV ticketlock (baseline) 2409639 - 1289398 - qspinlock 2425876 +0.7% 1291248 +0.1% PV qspinlock 2425876 +0.7% 1299639 +0.8% unfair qspinlock 2435724 +1.1% 1441153 +11.8% unfair + PV qspinlock 2479339 +2.9% 1459854 +13.2% The XFS test had moderate spinlock contention of 1.6% whereas the ext4 test had heavy spinlock contention of 15.4% as reported by perf. A more interesting performance comparison is when there is overcommit. With...

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized