linux-kernel - [PATCH] sched: shorten setting the allowed cpu mask of task

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Message-ID: <BANLkTi=tPbwNP3xDYZVHHqQ2zZujCBT6jw@mail.gmail.com>
Date:	Fri, 6 May 2011 20:52:15 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>
Subject: [PATCH] sched: shorten setting the allowed cpu mask of task

When setting the allowed cpu mask for a given task, if the task is
already bound to certain cpu, after checking the validity of the new
mask of allowed cpus, job is done, and no further efforts needed for
the valid case as well.

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/kernel/sched.c	2011-04-27 11:48:50.000000000 +0800
+++ b/kernel/sched.c	2011-05-06 20:39:58.000000000 +0800
@@ -5899,9 +5899,9 @@ again:
 		goto out;
 	}

-	if (unlikely((p->flags & PF_THREAD_BOUND) && p != current &&
-		     !cpumask_equal(&p->cpus_allowed, new_mask))) {
-		ret = -EINVAL;
+	if ((p->flags & PF_THREAD_BOUND) && p != current) {
+		if (!cpumask_equal(&p->cpus_allowed, new_mask))
+			ret = -EINVAL;
 		goto out;
 	}
--
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