[PATCH 3/3] sched/fair: remove impossible condition from find_idlest_group_cpu

From: Joel Fernandes
Date: Fri Dec 15 2017 - 10:41:02 EST


find_idlest_group_cpu goes through CPUs of a group previous selected by
find_idlest_group. find_idlest_group returns NULL if the local group is the
selected one and doesn't execute find_idlest_group_cpu if the group to which
'cpu' belongs to is chosen. So we're always guaranteed to call
find_idlest_group_cpu with a group to which cpu is non-local. This makes one of
the conditions in find_idlest_group_cpu an impossible one, which we can get rid
off.

Reviewed-by: Brendan Jackman <brendan.jackman@xxxxxxx>
Reviewed-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Joel Fernandes <joelaf@xxxxxxxxxx>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1b10821d8380..44407e703b5f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5948,7 +5948,7 @@ find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this
}
} else if (shallowest_idle_cpu == -1) {
load = weighted_cpuload(cpu_rq(i));
- if (load < min_load || (load == min_load && i == this_cpu)) {
+ if (load < min_load) {
min_load = load;
least_loaded_cpu = i;
}
--
2.15.1.504.g5279b80103-goog