linux-kernel - [RFC PATCH 05/10] ARM: Add HMP scheduling support for ARM architecture

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Date:	Fri, 21 Sep 2012 19:32:20 +0100
From:	morten.rasmussen@....com
To:	paulmck@...ux.vnet.ibm.com, pjt@...gle.com, peterz@...radead.org,
	suresh.b.siddha@...el.com
Cc:	morten.rasmussen@....com, linaro-sched-sig@...ts.linaro.org,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 05/10] ARM: Add HMP scheduling support for ARM architecture

From: Morten Rasmussen <morten.rasmussen@....com>

Adds Kconfig entries to enable HMP scheduling on ARM platforms.
Currently, it disables CPU level sched_domain load-balacing in order
to simplify things. This needs fixing in a later revision. HMP
scheduling will do the load-balancing at this level instead.

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
---
 arch/arm/Kconfig                |   14 ++++++++++++++
 arch/arm/include/asm/topology.h |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 05de193..cb80846 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1584,6 +1584,20 @@ config SCHED_HMP_PRIO_FILTER_VAL
 	default 5
 	depends on SCHED_HMP_PRIO_FILTER
 
+config HMP_FAST_CPU_MASK
+	string "HMP scheduler fast CPU mask"
+	depends on SCHED_HMP
+	help
+          Specify the cpuids of the fast CPUs in the system as a list string,
+	  e.g. cpuid 0+1 should be specified as 0-1.
+
+config HMP_SLOW_CPU_MASK
+	string "HMP scheduler slow CPU mask"
+	depends on SCHED_HMP
+	help
+	  Specify the cpuids of the slow CPUs in the system as a list string,
+	  e.g. cpuid 0+1 should be specified as 0-1.
+
 config HAVE_ARM_SCU
 	bool
 	help
diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
index 58b8b84..13a03de 100644
--- a/arch/arm/include/asm/topology.h
+++ b/arch/arm/include/asm/topology.h
@@ -27,6 +27,38 @@ void init_cpu_topology(void);
 void store_cpu_topology(unsigned int cpuid);
 const struct cpumask *cpu_coregroup_mask(int cpu);
 
+#ifdef CONFIG_DISABLE_CPU_SCHED_DOMAIN_BALANCE
+/* Common values for CPUs */
+#ifndef SD_CPU_INIT
+#define SD_CPU_INIT (struct sched_domain) {				\
+	.min_interval		= 1,					\
+	.max_interval		= 4,					\
+	.busy_factor		= 64,					\
+	.imbalance_pct		= 125,					\
+	.cache_nice_tries	= 1,					\
+	.busy_idx		= 2,					\
+	.idle_idx		= 1,					\
+	.newidle_idx		= 0,					\
+	.wake_idx		= 0,					\
+	.forkexec_idx		= 0,					\
+									\
+	.flags			= 0*SD_LOAD_BALANCE			\
+				| 1*SD_BALANCE_NEWIDLE			\
+				| 1*SD_BALANCE_EXEC			\
+				| 1*SD_BALANCE_FORK			\
+				| 0*SD_BALANCE_WAKE			\
+				| 1*SD_WAKE_AFFINE			\
+				| 0*SD_PREFER_LOCAL			\
+				| 0*SD_SHARE_CPUPOWER			\
+				| 0*SD_SHARE_PKG_RESOURCES		\
+				| 0*SD_SERIALIZE			\
+				,					\
+	.last_balance		 = jiffies,				\
+	.balance_interval	= 1,					\
+}
+#endif
+#endif /* CONFIG_DISABLE_CPU_SCHED_DOMAIN_BALANCE */
+
 #else
 
 static inline void init_cpu_topology(void) { }
-- 
1.7.9.5


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