linux-kernel - [PATCH] sched: At sched_fork use __set_task

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Date:	Sun, 29 Jan 2012 22:34:37 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	mingo@...e.hu, a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] sched: At sched_fork use __set_task_cpu().

 We don't use select_task_rq() from sched_fork() anymore and no chance of task gets migrated at
this point. Therefore, we can avoid task migration related checking/accounting, so use
__set_task_cpu() instead of set_task_cpu().

Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
---

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index df00cb0..a38026e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1755,7 +1755,7 @@ void sched_fork(struct task_struct *p)
 	 * Silence PROVE_RCU.
 	 */
 	raw_spin_lock_irqsave(&p->pi_lock, flags);
-	set_task_cpu(p, cpu);
+	__set_task_cpu(p, cpu);
 	raw_spin_unlock_irqrestore(&p->pi_lock, flags);

 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)

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