linux-kernel - [PATCH] sched: deduplicate mm checks in normalize_rt

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Date:	Thu, 21 Apr 2011 21:15:56 +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>
Subject: [PATCH] sched: deduplicate mm checks in normalize_rt_tasks()

When normalizing realtime tasks, only user tasks are concerned by
checking their ->mm.
If the task is not realtime, the -mm is checked again, thus the
overwork could be removed.

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

--- a/kernel/sched.c	2011-03-30 03:09:48.000000000 +0800
+++ b/kernel/sched.c	2011-04-21 20:59:28.000000000 +0800
@@ -8364,7 +8364,7 @@ void normalize_rt_tasks(void)
 			 * Renice negative nice level userspace
 			 * tasks back to 0:
 			 */
-			if (TASK_NICE(p) < 0 && p->mm)
+			if (TASK_NICE(p) < 0)
 				set_user_nice(p, 0);
 			continue;
 		}
--
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