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sched_ext: idle: small CPU iteration refactoring

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Replace the loop to check if all SMT CPUs are idle with
cpumask_subset(). This simplifies the code and slightly improves
efficiency, while preserving the original behavior.

Note that idle_masks.smt handling remains racy, which is acceptable as
it serves as an optimization and is self-correcting.

Suggested-and-reviewed-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Andrea Righi 2025-01-04 10:00:09 +01:00 committed by Tejun Heo
parent c0cf353009
commit d9071ecb31
1 changed files with 2 additions and 4 deletions
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kernel/sched/ext.c
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@ -3671,10 +3671,8 @@ void __scx_update_idle(struct rq *rq, bool idle)
* idle_masks.smt handling is racy but that's fine as
* it's only for optimization and self-correcting.
*/
for_each_cpu(cpu, smt) {
if (!cpumask_test_cpu(cpu, idle_masks.cpu))
if (!cpumask_subset(smt, idle_masks.cpu))
return;
}
cpumask_or(idle_masks.smt, idle_masks.smt, smt);
} else {
cpumask_andnot(idle_masks.smt, idle_masks.smt, smt);