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sched: avoid pushing tasks to an offline CPU

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Currently active_load_balance_cpu_stop is run by cpu stopper and it
pushes running tasks off the busiest CPU onto idle target CPU. But
there is no check to see whether target cpu is offline or not before
pushing the tasks.  With the introduction of active migration in the
scheduler tick path (see check_for_migration()) there have been
instances of attempts to migrate tasks to offline CPUs.

Add a check as to whether the target cpu is online or not to prevent
scheduling on offline CPUs.

Change-Id: Ib8ac7f8aeabd3ca7365f3eae977075952dab4f21
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
This commit is contained in:
Prasad Sodagudi
2014-07-05 13:08:54 +05:30
committed by Todd Kjos
parent 2da014c0d8
commit dc626b28ee
1 changed files with 2 additions and 1 deletions
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3
kernel/sched/fair.c
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@@ -9463,7 +9463,8 @@ static int active_load_balance_cpu_stop(void *data)
push_task = busiest_rq->push_task;
if (push_task) {
if (task_on_rq_queued(push_task) &&
task_cpu(push_task) == busiest_cpu) {
task_cpu(push_task) == busiest_cpu &&
cpu_online(target_cpu)) {
detach_task(push_task, &env);
push_task_detached = 1;
}