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authorMorten Rasmussen <Morten.Rasmussen@arm.com>2012-09-14 14:38:12 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2013-01-04 12:25:52 +0530
commit1cdd8b72f8fa52af7dc33d00c338de65afc1c8bb (patch)
tree007a2f906eb2988f2ceb62aaa72b118595f14401
parent335a22ef65878dad2d78859b44889515ceca0ff0 (diff)
downloadvexpress-lsk-1cdd8b72f8fa52af7dc33d00c338de65afc1c8bb.tar.gz
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>
-rw-r--r--arch/arm/Kconfig14
-rw-r--r--arch/arm/include/asm/topology.h31
2 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8d11cece43a..cad806996ba 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1592,6 +1592,20 @@ 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 58b8b84adcd..5692ba11322 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) { }