linux-kernel - [PATCH] sched: cleanup adjusting sched

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Date:	Mon, 24 Sep 2007 13:51:55 -0700
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] sched: cleanup adjusting sched_class

Hi Ingo and Dmitry,

I made a clean-up patch about fixing invalid sched_class use.

Dmitry, could you please review and sign it?


The adjusting sched_class is a missing part of the already existing
"do not leak PI boosting priority to the child" at the sched_fork().
This patch moves the adjusting sched_class from wake_up_new_task()
to sched_fork().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---

diff --git a/kernel/sched.c b/kernel/sched.c
index 6107a0c..8862761 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1641,6 +1641,8 @@ void sched_fork(struct task_struct *p, int clone_flags)
 	 * Make sure we do not leak PI boosting priority to the child:
 	 */
 	p->prio = current->normal_prio;
+	if (!rt_prio(p->prio))
+		p->sched_class = &fair_sched_class;
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 	if (likely(sched_info_on()))
@@ -1682,11 +1684,6 @@ void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 
 	p->prio = effective_prio(p);
 
-	if (rt_prio(p->prio))
-		p->sched_class = &rt_sched_class;
-	else
-		p->sched_class = &fair_sched_class;
-
 	if (!p->sched_class->task_new || !sysctl_sched_child_runs_first ||
 			(clone_flags & CLONE_VM) || task_cpu(p) != this_cpu ||
 			!current->se.on_rq) {


-
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