aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDietmar Eggemann <dietmar.eggemann@arm.com>2015-01-26 19:01:34 +0000
committerRobin Randhawa <robin.randhawa@arm.com>2015-04-09 12:26:15 +0100
commit08eda3bb8804847aa42dbb4154aecd53102b7fd7 (patch)
tree7e06cdb22c363dd2ec829ae59ef34bf3d435d9f2
parent93859f6416c77c358d316e1b291524bd3ec0316d (diff)
downloadkernel-08eda3bb8804847aa42dbb4154aecd53102b7fd7.tar.gz
sched: Skip cpu as lb src which has one task and capacity gte the dst cpu
Skip cpu as a potential src (costliest) in case it has only one task running and its original capacity is greater than or equal to the original capacity of the dst cpu. cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> [major changes: Juri Lelli]
-rw-r--r--kernel/sched/fair.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 42cd7cb..bf175b5 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6758,6 +6758,10 @@ static struct rq *find_busiest_queue(struct lb_env *env,
};
unsigned long energy = sched_group_energy(&eenv);
+ if (rq->nr_running == 1 && capacity_orig_of(i) >=
+ capacity_orig_of(env->dst_cpu))
+ continue;
+
/*
* We're looking for the minimal cpu efficiency
* min(u_i / e_i), crosswise multiplication leads to
@@ -7176,7 +7180,8 @@ static int idle_balance(struct rq *this_rq)
*/
this_rq->idle_stamp = rq_clock(this_rq);
- if (this_rq->avg_idle < sysctl_sched_migration_cost)
+ if (this_rq->avg_idle < sysctl_sched_migration_cost ||
+ !energy_aware())
goto out;
/*