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sched/fair: Use cpumask_weight_and() in sched_balance_find_dst_group()

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In the group_has_spare case, the function creates a temporary cpumask
to just calculate weight of (p->cpus_ptr & sched_group_span(local)).

We've got a dedicated helper for it.

Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Reviewed-by: Fernand Sieber <sieberf@amazon.com>
Link: https://patch.msgid.link/20251207034247.402926-1-yury.norov@gmail.com
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Yury Norov (NVIDIA) authored and Peter Zijlstra committed 2026-01-08 12:43:56 +01:00
1 parent 0ab25ea2a3
commit 55b39b0cf1
1 file changed
+3 -4
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kernel/sched/fair.c
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@@ -10974,10 +10974,9 @@ sched_balance_find_dst_group(struct sched_domain *sd, struct task_struct *p, int
* take care of it.
*/
if (p->nr_cpus_allowed != NR_CPUS) {
struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_rq_mask);
cpumask_and(cpus, sched_group_span(local), p->cpus_ptr);
imb_numa_nr = min(cpumask_weight(cpus), sd->imb_numa_nr);
unsigned int w = cpumask_weight_and(p->cpus_ptr,
sched_group_span(local));
imb_numa_nr = min(w, sd->imb_numa_nr);
}
imbalance = abs(local_sgs.idle_cpus - idlest_sgs.idle_cpus);