linux-kernel - [PATCH 8/15] sched: Add parameter sched_mn_power_savings to control MN domain sched policy

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Date:	Thu, 20 Aug 2009 15:39:14 +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 8/15] sched: Add parameter sched_mn_power_savings to
	control MN domain sched policy


Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 include/linux/sched.h |    4 +++-
 kernel/sched.c        |   38 ++++++++++++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3a1f8db..5755643 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -832,7 +832,9 @@ enum powersavings_balance_level {
 	MAX_POWERSAVINGS_BALANCE_LEVELS
 };
 
-extern int sched_mc_power_savings, sched_smt_power_savings;
+extern int sched_mn_power_savings;
+extern int sched_mc_power_savings;
+extern int sched_smt_power_savings;
 
 static inline int sd_balance_for_mc_power(void)
 {
diff --git a/kernel/sched.c b/kernel/sched.c
index 6cfc840..ebcda58 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8179,7 +8179,9 @@ static void sched_domain_node_span(int node, struct cpumask *span)
 }
 #endif /* CONFIG_NUMA */
 
-int sched_smt_power_savings = 0, sched_mc_power_savings = 0;
+int sched_mn_power_savings = 0;
+int sched_mc_power_savings = 0;
+int sched_smt_power_savings = 0;
 
 /*
  * The cpus mask in sched_group and sched_domain hangs off the end.
@@ -9135,7 +9137,8 @@ static void arch_reinit_sched_domains(void)
 	put_online_cpus();
 }
 
-static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
+static ssize_t sched_power_savings_store(const char *buf, size_t count,
+					 enum sched_domain_level dl)
 {
 	unsigned int level = 0;
 
@@ -9152,16 +9155,34 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 	if (level >= MAX_POWERSAVINGS_BALANCE_LEVELS)
 		return -EINVAL;
 
-	if (smt)
+	if (dl == SD_LV_SIBLING)
 		sched_smt_power_savings = level;
-	else
+	else if (dl == SD_LV_MC)
 		sched_mc_power_savings = level;
+	else if (dl == SD_LV_MN)
+		sched_mn_power_savings = level;
 
 	arch_reinit_sched_domains();
 
 	return count;
 }
 
+#ifdef CONFIG_SCHED_MN
+static ssize_t sched_mn_power_savings_show(struct sysdev_class *class,
+					   char *page)
+{
+	return sprintf(page, "%u\n", sched_mn_power_savings);
+}
+static ssize_t sched_mn_power_savings_store(struct sysdev_class *class,
+					    const char *buf, size_t count)
+{
+	return sched_power_savings_store(buf, count, SD_LV_MN);
+}
+static SYSDEV_CLASS_ATTR(sched_mn_power_savings, 0644,
+			 sched_mn_power_savings_show,
+			 sched_mn_power_savings_store);
+#endif
+
 #ifdef CONFIG_SCHED_MC
 static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
 					   char *page)
@@ -9171,7 +9192,7 @@ static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
 static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
 					    const char *buf, size_t count)
 {
-	return sched_power_savings_store(buf, count, 0);
+	return sched_power_savings_store(buf, count, SD_LV_MC);
 }
 static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
 			 sched_mc_power_savings_show,
@@ -9187,7 +9208,7 @@ static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
 static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
 					     const char *buf, size_t count)
 {
-	return sched_power_savings_store(buf, count, 1);
+	return sched_power_savings_store(buf, count, SD_LV_SIBLING);
 }
 static SYSDEV_CLASS_ATTR(sched_smt_power_savings, 0644,
 		   sched_smt_power_savings_show,
@@ -9208,6 +9229,11 @@ int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
 		err = sysfs_create_file(&cls->kset.kobj,
 					&attr_sched_mc_power_savings.attr);
 #endif
+#ifdef CONFIG_SCHED_MN
+	if (!err && mc_capable())
+		err = sysfs_create_file(&cls->kset.kobj,
+					&attr_sched_mn_power_savings.attr);
+#endif
 	return err;
 }
 #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-- 
1.6.0.4



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