linux-kernel - [PATCH] [3/4] SCHED: don't inline idle

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Message-Id: <20081112124511.6A2933E660F@basil.firstfloor.org>
Date:	Wed, 12 Nov 2008 13:45:11 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	mingo@...e.hu, linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH] [3/4] SCHED: don't inline idle_balance into schedule()


This function is not called under load, so it makes sense to out of line
it to get better register allocation in schedule() and make the assembler
easier to read.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 kernel/sched.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.28-rc4-test/kernel/sched.c
===================================================================
--- linux-2.6.28-rc4-test.orig/kernel/sched.c	2008-11-12 12:52:52.000000000 +0100
+++ linux-2.6.28-rc4-test/kernel/sched.c	2008-11-12 13:07:53.000000000 +0100
@@ -3696,7 +3696,7 @@
  * idle_balance is called by schedule() if this_cpu is about to become
  * idle. Attempts to pull tasks from other CPUs.
  */
-static void idle_balance(int this_cpu, struct rq *this_rq)
+static void noinline idle_balance(int this_cpu, struct rq *this_rq)
 {
 	struct sched_domain *sd;
 	int pulled_task = -1;
--
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