diff options
| author | Peng Wang <rocking@linux.alibaba.com> | 2020-04-11 17:20:20 +0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-04-30 20:14:38 +0200 |
| commit | 64297f2b03cc7a6d0184a435f1b296beca1bedd1 (patch) | |
| tree | 39666b419b1d3248e5c33d23a3203d8e3ec123a2 | |
| parent | ab93a4bc955b3980c699430bc0b633f0d8b607be (diff) | |
sched/fair: Simplify the code of should_we_balance()
We only consider group_balance_cpu() after there is no idle
cpu. So, just do comparison before return at these two cases.
Signed-off-by: Peng Wang <rocking@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/245c792f0e580b3ca342ad61257f4c066ee0f84f.1586594833.git.rocking@linux.alibaba.com
| -rw-r--r-- | kernel/sched/fair.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3d6ce751abb6..63419c6d9641 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -9413,7 +9413,7 @@ static int active_load_balance_cpu_stop(void *data); static int should_we_balance(struct lb_env *env) { struct sched_group *sg = env->sd->groups; - int cpu, balance_cpu = -1; + int cpu; /* * Ensure the balancing environment is consistent; can happen @@ -9434,18 +9434,12 @@ static int should_we_balance(struct lb_env *env) if (!idle_cpu(cpu)) continue; - balance_cpu = cpu; - break; + /* Are we the first idle CPU? */ + return cpu == env->dst_cpu; } - if (balance_cpu == -1) - balance_cpu = group_balance_cpu(sg); - - /* - * First idle CPU or the first CPU(busiest) in this sched group - * is eligible for doing load balancing at this and above domains. - */ - return balance_cpu == env->dst_cpu; + /* Are we the first CPU of this group ? */ + return group_balance_cpu(sg) == env->dst_cpu; } /* |