Re: [PATCH v2 01/12] sched/isolation: Separate housekeeping types in enum hk_type

Frederic Weisbecker
2026-04-15T10:02:52Z

Le Mon, Apr 13, 2026 at 03:25:46PM -0400, Waiman Long a écrit :
> On 4/13/26 3:43 AM, Qiliang Yuan wrote:
> > Most kernel noise types (TICK, TIMER, RCU, etc.) are currently aliased
> > to a single HK_TYPE_KERNEL_NOISE enum value. This prevents fine-grained
> > runtime isolation control as all masks are forced to be identical.
> >
> > Un-alias service-specific housekeeping types in enum hk_type. This
> > separation provides the necessary granularity for DHM subsystems to
> > subscribe to and maintain independent affinity masks.
>
> Usually, if we want to run a latency sensitive workload like DPDK, we try to
> minimize all sorts of kernel noises or interference as much as possible. Do
> you have a good use case where it is advantageous to remove some types of
> kernel noises from a given set of CPUs but not the others?

Right what we want to do here is to remove the aliases (HK_TYPE_TIMER,
HK_TYPE_WQ, ...) and rename them to HK_TYPE_KERNEL_NOISE.

Thanks.

--
Frederic Weisbecker
SUSE Labs