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SubjectRe: [PATCH-tip v2 00/10] locking/rwsem: Rwsem rearchitecture part 1
On Fri, 15 Feb 2019, Waiman Long wrote:

> v2:
> - Sync up to v4 of the part 0 patch.
> - Remove the rwsem.h->rwsem-xadd.h renaming patch & change patches
> to modify rwsem.h instead of rwsem-xadd.h.
> - Add a new patch to micro-optimize rwsem_try_read_lock_unqueued().
>This is part 1 of a 3-part (0/1/2) series to rearchitect the internal
>operation of rwsem. This depends on the v4 part 0 patches sent out
>This part lays the foundation for part 2 without making any functional
>changes. This part includes the following changes:
> 1) Move code around and micro-optimize rwsem_try_read_lock_unqueued()
> (patches 1-4).
> 2) Enhance the DEBUG_RWSEMS_WARN_ON() macro to provide more information
> and add additional checks (patches 5 & 6).
> 3) Make the core qspinlock_stat.h code generic (lock event counting)
> so that it can be used by all the architectures as well as other
> locking subsystems such as rwsem (patches 7-10). Lock event
> counting help us visualize how frequently a code path is being
> used as well as spotting abnormal behavior due to bugs in the code
> without noticeably affecting kernel performance and hence behavior.
>Both (2) and (3) are useful debugging aids.

Yes, this will come in handy in the future. Feel free to add my:

Acked-by: Davidlohr Bueso <>


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