linux-kernel - [PATCH 10/15] sched: Check for sched_mn_power

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Message-ID: <20090820134104.GY29327@alberich.amd.com>
Date:	Thu, 20 Aug 2009 15:41:04 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH 10/15] sched: Check for sched_mn_power_savings when doing
	load balancing


The patch adds support for POWERSAVINGS_BALANCE_BASIC for MN domain
level. Currently POWERSAVINGS_BALANCE_WAKEUP is not used for MN domain.

(I have to admit that so far I don't have the correct understanding
what's the benefit of POWERSAVINGS_BALANCE_WAKEUP (when an deticated
wakeup CPU is used) in contrast to POWERSAVINGS_BALANCE_BASIC.  I also
have not found an example that would demonstrate the difference
between those two powersaving levels.)

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 kernel/sched.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index ebcda58..7a0d710 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4591,7 +4591,8 @@ static int find_new_ilb(int cpu)
 	 * Have idle load balancer selection from semi-idle packages only
 	 * when power-aware load balancing is enabled
 	 */
-	if (!(sched_smt_power_savings || sched_mc_power_savings))
+	if (!(sched_smt_power_savings || sched_mc_power_savings ||
+	      sched_mn_power_savings))
 		goto out_done;
 
 	/*
@@ -4681,7 +4682,7 @@ int select_nohz_load_balancer(int stop_tick)
 			int new_ilb;
 
 			if (!(sched_smt_power_savings ||
-						sched_mc_power_savings))
+			      sched_mc_power_savings || sched_mn_power_savings))
 				return 1;
 			/*
 			 * Check to see if there is a more power-efficient
-- 
1.6.0.4



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