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SubjectRe: [PATCH v6 0/6] lockinig/rwsem: Fix rwsem bugs & enable true lock handoff
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On 11/17/22 21:20, Waiman Long wrote:
> v6:
> - Fix an error in patch 2 reported by kernel test robot.
>
> v5:
> - Drop patch 2 and replace it with 2 new patches disabling preemption on
> all reader functions and writer functions respectively. The other
> patches are adjusted accordingly.
>
> v4:
> - Update patch descriptions in patches 1 & 2 to make clear the live
> lock conditions that are being fixed by these patches. There is no code
> change from v3.
>
> It turns out the current waiter optimistic spinning code does not work
> that well if we have RT tasks in the mix. This patch series include two
> different fixes to resolve those issues. The last 3 patches modify the
> handoff code to implement true lock handoff similar to that of mutex.
>
> Waiman Long (6):
> locking/rwsem: Prevent non-first waiter from spinning in down_write()
> slowpath
> locking/rwsem: Disable preemption at all down_read*() and up_read()
> code paths
> locking/rwsem: Disable preemption at all down_write*() and up_write()
> code paths
> locking/rwsem: Change waiter->hanodff_set to a handoff_state enum
> locking/rwsem: Enable direct rwsem lock handoff
> locking/rwsem: Update handoff lock events tracking
>
> kernel/locking/lock_events_list.h | 6 +-
> kernel/locking/rwsem.c | 240 ++++++++++++++++++++++--------
> 2 files changed, 182 insertions(+), 64 deletions(-)
>
Peter,

I know that you are busy these days. Do have any further comment or
suggestion on this patch series?

Looking forward to your reply.

Thanks,
Longman

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