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authorWanpeng Li <wanpeng.li@linux.intel.com>2014-10-22 08:36:43 +0800
committerIngo Molnar <mingo@kernel.org>2014-10-28 10:47:57 +0100
commitd9aade7ae1d283097a3f626790e7c325a5c69007 (patch)
treeb96abee1f9b1fdd554b0c2711fe9fad45f0e2c24 /kernel/sched
parente2336f6e51edda875a49770b616ed5b02a74665b (diff)
downloadop-kernel-dev-d9aade7ae1d283097a3f626790e7c325a5c69007.zip
op-kernel-dev-d9aade7ae1d283097a3f626790e7c325a5c69007.tar.gz
sched/deadline: Do not try to push tasks if pinned task switches to dl
As Kirill mentioned (https://lkml.org/lkml/2013/1/29/118): | If rq has already had 2 or more pushable tasks and we try to add a | pinned task then call of push_rt_task will just waste a time. Just switched pinned task is not able to be pushed. If the rq has had several dl tasks before they have already been considered as candidates to be pushed (or pulled). This patch implements the same behavior as rt class which introduced by commit 10447917551e ("sched/rt: Do not try to push tasks if pinned task switches to RT"). Suggested-by: Kirill V Tkhai <tkhai@yandex.ru> Acked-by: Juri Lelli <juri.lelli@arm.com> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1413938203-224610-1-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/deadline.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 5285332..9d1e76a 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1622,7 +1622,8 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p)
if (task_on_rq_queued(p) && rq->curr != p) {
#ifdef CONFIG_SMP
- if (rq->dl.overloaded && push_dl_task(rq) && rq != task_rq(p))
+ if (p->nr_cpus_allowed > 1 && rq->dl.overloaded &&
+ push_dl_task(rq) && rq != task_rq(p))
/* Only reschedule if pushing failed */
check_resched = 0;
#endif /* CONFIG_SMP */
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