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SubjectRe: [PATCH-tip v2 00/12] locking/rwsem: Rwsem rearchitecture part 2
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On 04/10/2019 06:00 AM, Ingo Molnar wrote:
> * Waiman Long <longman@redhat.com> wrote:
>
>> # of Threads Before Patch After Patch
>> ------------ ------------ -----------
>> 2 1,179 9,436
>> 4 1,505 8,268
>> 8 721 7,041
>> 16 575 7,652
>> 32 70 2,189
>> 64 39 534
>>
>> Waiman Long (12):
>> locking/rwsem: Implement a new locking scheme
>> locking/rwsem: Implement lock handoff to prevent lock starvation
>> locking/rwsem: Remove rwsem_wake() wakeup optimization
>> locking/rwsem: Make rwsem_spin_on_owner() return owner state
>> locking/rwsem: Ensure an RT task will not spin on reader
>> locking/rwsem: Wake up almost all readers in wait queue
>> locking/rwsem: Enable readers spinning on writer
>> locking/rwsem: Enable time-based spinning on reader-owned rwsem
>> locking/rwsem: Add more rwsem owner access helpers
>> locking/rwsem: Guard against making count negative
>> locking/rwsem: Merge owner into count on x86-64
>> locking/rwsem: Remove redundant computation of writer lock word
>>
>> kernel/locking/lock_events_list.h | 4 +
>> kernel/locking/rwsem-xadd.c | 635 +++++++++++++++++++-----------
>> kernel/locking/rwsem.c | 3 +-
>> kernel/locking/rwsem.h | 290 +++++++++++---
>> 4 files changed, 647 insertions(+), 285 deletions(-)
> Looks very nice!
>
> With both sets of patches applied they pass all x86 tests, but there's
> cross-build failures on powerpc32, sparc32 and UML:
>
> kernel/locking/rwsem.h:333:34: error: 'struct rw_semaphore' has no member named 'owner'
>
> Could you please send a delta patch against tip:WIP.locking/core, which
> is the work-in-progress tree? I'll backmerge the delta patch (and any
> other updates you might have meanwhil) to the one that introduces the
> breakage.
>
> Thanks,
>
> Ingo

Sure. I will look into that and fix failures.

Thanks,
Longman

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