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[2/2] sched/rt: Optimizate task_woken_rt()

Message ID 1430411598-4904-2-git-send-email-xlpang@126.com
State New
Headers show

Commit Message

Xunlei Pang April 30, 2015, 4:33 p.m. UTC 
From: Xunlei Pang <pang.xunlei@linaro.org>

- Remove "has_pushable_tasks(rq)" condition, because for queued p,
"!task_running(rq, p)" and "p->nr_cpus_allowed > 1" implies true
"has_pushable_tasks(rq)".

- Remove "!test_tsk_need_resched(rq->curr)" condition, because
the flag might be set right before the waking up, but we still
need to push equal or lower priority tasks, it should be removed.
Without this condition, we actually get the right logic.

Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
---
 kernel/sched/rt.c | 2 --
 1 file changed, 2 deletions(-)
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Patch

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index a9d33a3..9d735da 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2233,8 +2233,6 @@  out:
 static void task_woken_rt(struct rq *rq, struct task_struct *p)
 {
 	if (!task_running(rq, p) &&
-	    !test_tsk_need_resched(rq->curr) &&
-	    has_pushable_tasks(rq) &&
 	    p->nr_cpus_allowed > 1 &&
 	    (dl_task(rq->curr) || rt_task(rq->curr)) &&
 	    (rq->curr->nr_cpus_allowed < 2 ||