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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
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8
kernel/kthread.c
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@ -362,18 +362,20 @@ static void kthread_fetch_affinity(struct kthread *kthread, struct cpumask *cpum
{ {
const struct cpumask *pref; const struct cpumask *pref;
guard(rcu)();
if (kthread->preferred_affinity) { if (kthread->preferred_affinity) {
pref = kthread->preferred_affinity; pref = kthread->preferred_affinity;
} else { } else {
if (kthread->node == NUMA_NO_NODE) if (kthread->node == NUMA_NO_NODE)
pref = housekeeping_cpumask(HK_TYPE_KTHREAD); pref = housekeeping_cpumask(HK_TYPE_DOMAIN);
else else
pref = cpumask_of_node(kthread->node); 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)) 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) static void kthread_affine_node(void)