Re: [RFC PATCH 0/8] cgroup/cpuset: Support RCU_NOCB on isolated partitions

Waiman Long
2024-01-23T05:50:55Z

On 1/22/24 10:07, Michal Koutný wrote:
> Hello Waiman.
>
> On Wed, Jan 17, 2024 at 11:35:03AM -0500, Waiman Long <longman@redhat.com> wrote:
>> This patch series is based on the RFC patch from Frederic [1]. Instead
>> of offering RCU_NOCB as a separate option, it is now lumped into a
>> root-only cpuset.cpus.isolation_full flag that will enable all the
>> additional CPU isolation capabilities available for isolated partitions
>> if set. RCU_NOCB is just the first one to this party. Additional dynamic
>> CPU isolation capabilities will be added in the future.
> IIUC this is similar to what I suggested back in the day and you didn't
> consider it [1]. Do I read this right that you've changed your mind?

I didn't said that we were not going to do this at the time. It's just
that more evaluation will need to be done before we are going to do
this. I was also looking to see if there were use cases where such
capabilities were needed. Now I am aware that such use cases do exist
and we should start looking into it.

>
> (It's fine if you did, I'm only asking to follow the heading of cpuset
> controller.)

OK, the title of the cover-letter may be too specific. I will make it
more general in the next version.

Cheers,
Longman