From: Hao Jia Date: Fri, 16 Dec 2022 06:24:05 +0000 (+0800) Subject: sched/numa: Stop an exhastive search if an idle core is found X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=feaed76376fd612b9450ad1251aec20a63ccfe92;p=linux.git sched/numa: Stop an exhastive search if an idle core is found In update_numa_stats() we try to find an idle cpu on the NUMA node, preferably an idle core. we can stop looking for the next idle core or idle cpu after finding an idle core. But we can't stop the whole loop of scanning the CPU, because we need to calculate approximate NUMA stats at a point in time. For example, the src and dst nr_running is needed by task_numa_find_cpu(). Signed-off-by: Hao Jia Signed-off-by: Peter Zijlstra (Intel) Acked-by: Mel Gorman Link: https://lore.kernel.org/r/20221216062406.7812-2-jiahao.os@bytedance.com --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index d0e2a48a882bb..aaff2092ffdf7 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1804,7 +1804,7 @@ static void update_numa_stats(struct task_numa_env *env, ns->nr_running += rq->cfs.h_nr_running; ns->compute_capacity += capacity_of(cpu); - if (find_idle && !rq->nr_running && idle_cpu(cpu)) { + if (find_idle && idle_core < 0 && !rq->nr_running && idle_cpu(cpu)) { if (READ_ONCE(rq->numa_migrate_on) || !cpumask_test_cpu(cpu, env->p->cpus_ptr)) continue;