linux-kernel - [PATCH 01/18] sched: select_task_rq

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Message-Id: <1355127754-8444-2-git-send-email-alex.shi@intel.com>
Date:	Mon, 10 Dec 2012 16:22:17 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	rob@...dley.net, mingo@...hat.com, peterz@...radead.org
Cc:	gregkh@...uxfoundation.org, andre.przywara@....com, rjw@...k.pl,
	paul.gortmaker@...driver.com, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	pjt@...gle.com, vincent.guittot@...aro.org
Subject: [PATCH 01/18] sched: select_task_rq_fair clean up

It is impossible to miss a task allowed cpu in a eligible group.

And since find_idlest_group only return a different group which
excludes old cpu, it's also imporissible to find a new cpu same as old
cpu.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/fair.c |    5 -----
 1 files changed, 0 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 59e072b..df99456 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3150,11 +3150,6 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 		}
 
 		new_cpu = find_idlest_cpu(group, p, cpu);
-		if (new_cpu == -1 || new_cpu == cpu) {
-			/* Now try balancing at a lower domain level of cpu */
-			sd = sd->child;
-			continue;
-		}
 
 		/* Now try balancing at a lower domain level of new_cpu */
 		cpu = new_cpu;
-- 
1.7.5.1

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