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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 <frederic@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Frederic Weisbecker 2025-06-02 21:21:55 +02:00
parent 92a734606e
commit 041ee6f372
1 changed files with 5 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

8
kernel/kthread.c
View file

@ -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)