linux-kernel - [PATCH 9/15] sched: Check sched_mn_power_savings when setting flags for CPU and MN domains

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Date:	Thu, 20 Aug 2009 15:40:13 +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 9/15] sched: Check sched_mn_power_savings when setting
	flags for CPU and MN domains


Use new function sd_balance_for_mn_power() and adapt
sd_balance_for_package_power() and sd_power_saving_flags() for correct
setting of flags SD_POWERSAVINGS_BALANCE and SD_BALANCE_NEWIDLE in CPU
and MN domains.

Furthermore add flag SD_SHARE_PKG_RESOURCES to MN domain.
Rational: a multi-node processor most likely shares package resources
(on Magny-Cours the package constitues a "voltage domain").

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 arch/x86/include/asm/topology.h |    3 ++-
 include/linux/sched.h           |   14 ++++++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 6d7d133..4a520b8 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -198,7 +198,8 @@ static inline void setup_node_to_cpumask_map(void) { }
 				| SD_BALANCE_EXEC	\
 				| SD_WAKE_AFFINE	\
 				| SD_WAKE_BALANCE	\
-				| sd_balance_for_package_power()\
+				| SD_SHARE_PKG_RESOURCES\
+				| sd_balance_for_mn_power()\
 				| sd_power_saving_flags(),\
 	.last_balance		= jiffies,		\
 	.balance_interval	= 1,			\
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5755643..c53bdd8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -844,9 +844,18 @@ static inline int sd_balance_for_mc_power(void)
 	return 0;
 }
 
+static inline int sd_balance_for_mn_power(void)
+{
+	if (sched_mc_power_savings || sched_smt_power_savings)
+		return SD_POWERSAVINGS_BALANCE;
+
+	return 0;
+}
+
 static inline int sd_balance_for_package_power(void)
 {
-	if (sched_mc_power_savings | sched_smt_power_savings)
+	if (sched_mn_power_savings || sched_mc_power_savings ||
+	    sched_smt_power_savings)
 		return SD_POWERSAVINGS_BALANCE;
 
 	return 0;
@@ -860,7 +869,8 @@ static inline int sd_balance_for_package_power(void)
 
 static inline int sd_power_saving_flags(void)
 {
-	if (sched_mc_power_savings | sched_smt_power_savings)
+	if (sched_mn_power_savings || sched_mc_power_savings ||
+	    sched_smt_power_savings)
 		return SD_BALANCE_NEWIDLE;
 
 	return 0;
-- 
1.6.0.4



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