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

[Juri Lelli]

Hi,

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 <juri.lelli@xxxxxxxxxx>

Thanks!

Juri

1 - https://lore.kernel.org/lkml/20190326093421.GA29508@xxxxxxxxxxxxxxxxxxxxx/