need_active_balance uses env->src_cpu which is set only if there is more
than 1 task on the run queue. We must set the src_cpu field unconditionnally
otherwise the test "env->src_cpu > env->dst_cpu" will always fail if there is
only 1 task on the run queue
Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
---
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 81fa536..32938ea 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5044,6 +5044,10 @@ redo:
ld_moved = 0;
lb_iterations = 1;
+
+ env.src_cpu = busiest->cpu;
+ env.src_rq = busiest;
+
if (busiest->nr_running > 1) {
/*
* Attempt to move tasks. If find_busiest_group has found
@@ -5052,8 +5056,6 @@ redo:
* correctly treated as an imbalance.
*/
env.flags |= LBF_ALL_PINNED;
- env.src_cpu = busiest->cpu;
- env.src_rq = busiest;
env.loop_max = min(sysctl_sched_nr_migrate,
busiest->nr_running);
update_h_load(env.src_cpu);
--
1.7.9.5
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