Re: [PATCH v2 1/2] sched/isolation: Exclude dynamically isolated CPUs from housekeeping masks
From: Waiman Long
Date: Fri Nov 15 2024 - 19:40:48 EST
On 11/15/24 10:45 AM, Michal Koutný wrote:
(Also someone mentioned that this could share lots of code with CPU
offlining/onlining.)
Yes, that is true. The simplest way to do that is to offline the CPUs to
be isolated, change the housekeeping masks and then online those CPUs
again. That is good for managing a single isolated partition. However,
Daniel had told me that CPU hotplug code could cause latency spike in
existing isolated CPUs. That could be a problem if we have more than one
isolated partitions to manage. So more investigation will be needed in this.
This is still the direction we are going initially, but first we need to
enable dynamic changes to the housekeeping masks first.
Cheers,
Longman