14 Mar
2023
14 Mar
'23
6:20 p.m.
On 3/14/23 12:50, Michal Koutný wrote:
On Mon, Mar 06, 2023 at 03:08:45PM -0500, Waiman Long longman@redhat.com wrote:
If a hotplug event doesn't affect the current cpuset, there is no point to call hotplug_update_tasks() or hotplug_update_tasks_legacy(). So just skip it.
This skips "insane" modification of cs->cpus_allowed in hotplug_update_tasks_legacy() but assuming cs->cpus_allowed is kept in sync with cs->effective_cpus on v1, it is OK to skip the update based only on effective_cpus check.
Yes, effective_cpus is equivalent to cpus_allowed in v1 unless you mount the cpuset with the cpuset_v2_mode flag which will behave more like v2 where effective_cpus is still the key.
Cheers, Longman