From: Morten Rasmussen <Morten.Rasmussen@arm.com>
Date: Fri, 14 Sep 2012 13:38:12 +0000 (+0100)
Subject: ARM: Add HMP scheduling support for ARM architecture
X-Git-Tag: firefly_0821_release~3680^2~16^2^2~75
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d278bb1c4d5191e0d9b9911337e3b31a100a7f9f;p=firefly-linux-kernel-4.4.55.git

ARM: Add HMP scheduling support for ARM architecture

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@arm.com>
---

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6157ed8e0e3e..99d41f9633bb 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1524,6 +1524,20 @@ 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 58b8b84adcd2..5692ba11322d 100644
--- a/arch/arm/include/asm/topology.h
+++ b/arch/arm/include/asm/topology.h
@@ -27,6 +27,37 @@ 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_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) { }