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kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management

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Unbound kthreads want to run neither on nohz_full CPUs nor on domain
isolated CPUs. And since nohz_full implies domain isolation, checking
the latter is enough to verify both.

Therefore exclude kthreads from domain isolation.

Signed-off-by: Frederic Weisbecker <[email protected]>
Reviewed-by: Waiman Long <[email protected]>
Cc: Marco Crivellari <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Waiman Long <[email protected]>
This commit is contained in:
Frederic Weisbecker committed 2026-02-03 15:23:35 +01:00
1 parent 92a734606e
commit 041ee6f372
1 file changed
+5 -3
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kernel/kthread.c
+5 -3
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@@ -362,18 +362,20 @@ static void kthread_fetch_affinity(struct kthread *kthread, struct cpumask *cpum
{
const struct cpumask *pref;
guard(rcu)();
if (kthread->preferred_affinity) {
pref = kthread->preferred_affinity;
} else {
if (kthread->node == NUMA_NO_NODE)
pref = housekeeping_cpumask(HK_TYPE_KTHREAD);
pref = housekeeping_cpumask(HK_TYPE_DOMAIN);
else
pref = cpumask_of_node(kthread->node);
}
cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_KTHREAD));
cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_DOMAIN));
if (cpumask_empty(cpumask))
cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_KTHREAD));
cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_DOMAIN));
}
static void kthread_affine_node(void)