linux-kernel - [PATCH 26/39] autonuma: select_idle_sibling cleanup target assignment

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Date:	Mon, 26 Mar 2012 19:46:13 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 26/39] autonuma: select_idle_sibling cleanup target assignment

Cleanup the code without reusing the cpu variable to simplify
readibility.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 kernel/sched/fair.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0d2fe26..693adc5 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2642,6 +2642,7 @@ static int select_idle_sibling(struct task_struct *p, int target)
 	struct sched_domain *sd;
 	struct sched_group *sg;
 	int i;
+	bool idle_target;
 
 	/*
 	 * If the task is going to be woken-up on this cpu and if it is
@@ -2661,6 +2662,7 @@ static int select_idle_sibling(struct task_struct *p, int target)
 	/*
 	 * Otherwise, iterate the domains and find an elegible idle cpu.
 	 */
+	idle_target = false;
 	sd = rcu_dereference(per_cpu(sd_llc, target));
 	for_each_lower_domain(sd) {
 		sg = sd->groups;
@@ -2674,7 +2676,6 @@ static int select_idle_sibling(struct task_struct *p, int target)
 					goto next;
 			}
 
-			cpu = -1;
 			for_each_cpu_and(i, sched_group_cpus(sg),
 						tsk_cpus_allowed(p)) {
 				/* Find autonuma cpu only in idle group */
@@ -2682,10 +2683,11 @@ static int select_idle_sibling(struct task_struct *p, int target)
 					target = i;
 					goto done;
 				}
-				if (cpu == -1)
-					cpu = i;
+				if (!idle_target) {
+					idle_target = true;
+					target = i;
+				}
 			}
-			target = cpu;
 next:
 			sg = sg->next;
 		} while (sg != sd->groups);
--
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