Re: [PATCH v2] locking/rwsem: reduce spinlock contention in wakeup after up_read/up_write

[Jason Low]

On Thu, 2015-04-23 at 14:24 -0400, Waiman Long wrote:

> The table below shows the % improvement in throughput (1100-2000 users)
> in the various AIM7's workloads:
> 
> 	Workload	% increase in throughput

Missing table here? :)

> ---
>  include/linux/osq_lock.h    |    5 +++
>  kernel/locking/rwsem-xadd.c |   72 ++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 76 insertions(+), 1 deletions(-)
> 
>  v1->v2:
>    - Add a memory barrier before calling spin_trylock for proper memory
>      ordering.


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