linux-kernel - [PATCH 03/10] sched: don't need go to smaller sched domain

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Message-Id: <1354542848-29638-4-git-send-email-alex.shi@intel.com>
Date:	Mon,  3 Dec 2012 21:54:07 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	npiggin@...nel.dk, mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH 03/10] sched: don't need go to smaller sched domain

If parent sched domain has no task allowed cpu find. neither find in
it's child. So, go out to save useless checking.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/fair.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b40bc2b..05ee54e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3150,10 +3150,8 @@ select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flags)
 			load_idx = sd->wake_idx;
 
 		group = find_idlest_group(sd, p, cpu, load_idx);
-		if (!group) {
-			sd = sd->child;
-			continue;
-		}
+		if (!group)
+			goto unlock;
 
 		new_cpu = find_idlest_cpu(group, p, cpu);
 
-- 
1.7.5.4

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