linux-kernel - [PATCH 3/3] sched: terminate newidle balancing once at least one task has moved over

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Message-ID: <20080624141612.28487.18128.stgit@lsg.lsg.lab.novell.com>
Date:	Tue, 24 Jun 2008 08:16:12 -0600
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, rostedt@...dmis.org, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	linux-rt-users@...r.kernel.org, ghaskins@...ell.com,
	dbahi@...ell.com, npiggin@...e.de
Subject: [PATCH 3/3] sched: terminate newidle balancing once at least one task
	has moved over

Inspired by Peter Zijlstra.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index e40c575..094a84b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2774,6 +2774,10 @@ static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
 				max_load_move - total_load_moved,
 				sd, idle, all_pinned, &this_best_prio);
 		class = class->next;
+
+		if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
+			break;
+
 	} while (class && max_load_move > total_load_moved);
 
 	return total_load_moved > 0;

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