Add an architecture specific function for setting cpu_power
Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
---
arch/arm/kernel/topology.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index faf66f3..974177d 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -52,6 +52,26 @@ static void default_cpu_topology_mask(void);
static void (*set_cpu_topology_mask)(void) = default_cpu_topology_mask;
/*
+ * cpu power scale management
+ */
+
+/*
+ * a per cpu data structure should be better because each cpu is mainly
+ * using its own cpu_power even it's not always true because of
+ * no_hz_idle_balance
+ */
+static DEFINE_PER_CPU(unsigned int, cpu_scale);
+
+/*
+ * Update the cpu power
+ */
+
+unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu)
+{
+ return per_cpu(cpu_scale, cpu);
+}
+
+/*
* default topology function
*/
@@ -271,6 +291,8 @@ void init_cpu_topology(void)
cpu_topo->socket_id = -1;
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
+
+ per_cpu(cpu_scale, cpu) = SCHED_POWER_SCALE;
}
smp_wmb();
}
--
1.7.4.1
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