diff options
| author | Kirill Tkhai <tkhai@yandex.ru> | 2014-05-09 03:00:14 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-05-22 13:16:33 +0400 |
| commit | 72465447867b9de6b5cdea5d10f9781585136270 (patch) | |
| tree | 2067c7c82f389c91c325d04797ced6b851ba1691 /kernel/sched/stop_task.c | |
| parent | 52a08ef1f13a11289c9e18cd4cfb4e51c024058b (diff) | |
| download | linux-72465447867b9de6b5cdea5d10f9781585136270.tar.xz | |
sched, nohz: Change rq->nr_running to always use wrappers
Sometimes ->nr_running may cross 2 but interrupt is not being
sent to rq's cpu. In this case we don't reenable the timer.
Looks like this may be the reason for rare unexpected effects,
if nohz is enabled.
Patch replaces all places of direct changing of nr_running
and makes add_nr_running() caring about crossing border.
Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140508225830.2469.97461.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/stop_task.c')
| -rw-r--r-- | kernel/sched/stop_task.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c index d6ce65dde541..bfe0edadbfbb 100644 --- a/kernel/sched/stop_task.c +++ b/kernel/sched/stop_task.c @@ -41,13 +41,13 @@ pick_next_task_stop(struct rq *rq, struct task_struct *prev) static void enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) { - inc_nr_running(rq); + add_nr_running(rq, 1); } static void dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) { - dec_nr_running(rq); + sub_nr_running(rq, 1); } static void yield_task_stop(struct rq *rq) |