diff options
| author | Olav Haugan <ohaugan@codeaurora.org> | 2015-08-05 08:45:21 -0700 |
|---|---|---|
| committer | Joel Fernandes <joelaf@google.com> | 2017-10-16 21:07:06 +0000 |
| commit | ec888d46d8993b2bf205ed375e538a3819c23659 (patch) | |
| tree | f9c51f9e229d996e17a137f4715020acdb2f3395 /kernel/sched/rt.c | |
| parent | 8526e9f06400ad95647c78617439216edf18977b (diff) | |
sched: Update task->on_rq when tasks are moving between runqueues
Task->on_rq has three states:
0 - Task is not on runqueue (rq)
1 (TASK_ON_RQ_QUEUED) - Task is on rq
2 (TASK_ON_RQ_MIGRATING) - Task is on rq but in the
process of being migrated to another rq
When a task is moving between rqs task->on_rq state should be
TASK_ON_RQ_MIGRATING in order for WALT to account rq's cumulative
runnable average correctly. Without such state marking for all the
classes, WALT's update_history() would try to fixup task's demand
which was never contributed to any of CPUs during migration.
Change-Id: Iced3428f3924fe8ab5d0075698273ead04f12d5b
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[joonwoop: Reinforced changelog to explain why this is needed by WALT.
Fixed conflicts in deadline.c]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel/sched/rt.c')
| -rw-r--r-- | kernel/sched/rt.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 6bb51d62dca4..3715473fd8f8 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1882,7 +1882,9 @@ retry: } deactivate_task(rq, next_task, 0); + next_task->on_rq = TASK_ON_RQ_MIGRATING; set_task_cpu(next_task, lowest_rq->cpu); + next_task->on_rq = TASK_ON_RQ_QUEUED; activate_task(lowest_rq, next_task, 0); ret = 1; @@ -2136,7 +2138,9 @@ static void pull_rt_task(struct rq *this_rq) resched = true; deactivate_task(src_rq, p, 0); + p->on_rq = TASK_ON_RQ_MIGRATING; set_task_cpu(p, this_cpu); + p->on_rq = TASK_ON_RQ_QUEUED; activate_task(this_rq, p, 0); /* * We continue with the search, just in |