Re: [RFC PATCH 4/4] cpuset: Support RCU-NOCB toggle on v2 root partitions

[Juri Lelli]

Hi,

On 26/05/22 14:37, Tejun Heo wrote:
> On Thu, May 26, 2022 at 08:28:43PM -0400, Waiman Long wrote:
> > I am thinking along the line that it will not be hierarchical. However,
> > cpuset can be useful if we want to have multiple isolated partitions
> > underneath the top cpuset with different isolation attributes, but no more
> > sub-isolated partition with sub-attributes underneath them. IOW, we can only
> > set them at the first level under top_cpuset. Will that be useful?
> 
> At that point, I'd just prefer to have it under /proc or /sys.

FWIW, I was under the impression that this would nicely fit along the
side of other feaures towards implenting dynamic isolation of CPUs (say
https://lore.kernel.org/lkml/20220510153413.400020-1-longman@xxxxxxxxxx/
for example). Wouldn't be awkward to have to poke different places to
achieve isolation at runtime?

Also, I wonder if a proc/sys interface might be problematic for certain
middleware that is substantially based on using cgroups. I'll try to ask
around. :)

Best,
Juri