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SubjectRe: [PATCH 0/5] locking: Percpu-rwsem rewrite

On 13/11/19 11:21, Peter Zijlstra wrote:
> Yet another version of the percpu-rwsem rewrite..
> This one (ab)uses the waitqueue in an entirely different and unique way, but no
> longer shares it like it did. It retains the use of rcuwait for the
> writer-waiting-for-readers-to-complete condition.
> This one should be FIFO fair with writer-stealing.
> It seems to pass locktorture torture_type=percpu_rwsem_lock. But as always,
> this stuff is tricky, please look carefully.

Backported this series to v5.2.21-rt13.

locktorture looks good (running for several hours) and DEBUG_LOCKS splat
[1] not reproducible anymore.

Tested-by: Juri Lelli <>



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