Messages in this thread Patch in this message | | | From | Srikar Dronamraju <> | Subject | [PATCH] sched/fair: Optimize select_idle_core | Date | Thu, 5 Dec 2019 22:53:16 +0530 |
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Currently we loop through all threads of a core to evaluate if the core is idle or not. This is unnecessary. If a thread of a core is not idle, skip evaluating other threads of a core.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> --- kernel/sched/fair.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 69a81a5709ff..b9d628128cfc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5872,10 +5872,12 @@ static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int bool idle = true; for_each_cpu(cpu, cpu_smt_mask(core)) { - __cpumask_clear_cpu(cpu, cpus); - if (!available_idle_cpu(cpu)) + if (!available_idle_cpu(cpu)) { idle = false; + break; + } } + cpumask_andnot(cpus, cpus, cpu_smt_mask(core)); if (idle) return core; -- 2.18.1
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