Re: [PATCH] percpu-refcount: Use normal instead of RCU-sched"

[Sebastian Andrzej Siewior]

On 2019-11-07 11:17:49 [-0500], Dennis Zhou wrote:
> Hello,

Hi,

> I just want to clarify a little bit. Is this patch aimed at fixing an
> issue with RT kernels specifically? 

Due to the implications of preempt_disable() on RT kernels it fixes
problems with RT kernels.

> It'd also be nice to have the
> numbers as well as if the kernel was RT or non-RT.

The benchmark was done on a CONFIG_PREEMPT kernel. As said in the commit
log, the numbers were mostly the same, I can re-run the test and post
numbers if you want them.
This patch makes no difference on PREEMPT_NONE or PREEMPT_VOLUNTARY
kernels.

> Thanks,
> Dennis

Sebastian