linux-kernel - [PATCH 5/5] sched/dl: Simplify pick_dl

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Message-ID: <1410529340.3569.27.camel@tkhai>
Date:	Fri, 12 Sep 2014 17:42:20 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, <tkhai@...dex.ru>
Subject: [PATCH 5/5] sched/dl: Simplify pick_dl_task()


1)Nobody calls pick_dl_task with negative cpu, it's old RT leftover.

2)If p->nr_cpus_allowed is 1, than the affinity has just been changed
in set_cpus_allowed_ptr(); we'll pick it just earlier than migration
thread.

Signed-off-by: Kirill Tkhai <ktkhai@...allels.com>
---
 kernel/sched/deadline.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index cc4eb89..aaa5abb 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1121,10 +1121,8 @@ static void set_curr_task_dl(struct rq *rq)
 static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu)
 {
 	if (!task_running(rq, p) &&
-	    (cpu < 0 || cpumask_test_cpu(cpu, &p->cpus_allowed)) &&
-	    (p->nr_cpus_allowed > 1))
+	    cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))
 		return 1;
-
 	return 0;
 }
 



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