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[RFC PATCH 1/8] ARM: initialize cpu_scale to its default

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  [RFC PATCH 1/8] ARM: initialize cpu_scale to its default Juri Lelli <juri.lelli@arm.com> - 2015-11-23 15:30 +0100
    Re: [RFC PATCH 1/8] ARM: initialize cpu_scale to its default Vincent Guittot <vincent.guittot@linaro.org> - 2015-11-30 12:20 +0100

#1275431 — [RFC PATCH 1/8] ARM: initialize cpu_scale to its default

Instead of looping through all cpus calling set_capacity_scale, we can
initialise cpu_scale per-cpu variables to SCHED_CAPACITY_SCALE with their
definition.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
---
 arch/arm/kernel/topology.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 08b7847..ec279d1 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -40,7 +40,7 @@
  * to run the rebalance_domains for all idle cores and the cpu_capacity can be
  * updated during this sequence.
  */
-static DEFINE_PER_CPU(unsigned long, cpu_scale);
+static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
 
 unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
 {
@@ -306,8 +306,6 @@ void __init init_cpu_topology(void)
 		cpu_topo->socket_id = -1;
 		cpumask_clear(&cpu_topo->core_sibling);
 		cpumask_clear(&cpu_topo->thread_sibling);
-
-		set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
 	}
 	smp_wmb();
 
-- 
2.2.2

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#1279774

On 23 November 2015 at 15:28, Juri Lelli <juri.lelli@arm.com> wrote:
> Instead of looping through all cpus calling set_capacity_scale, we can
> initialise cpu_scale per-cpu variables to SCHED_CAPACITY_SCALE with their
> definition.
>
> Cc: Russell King <linux@arm.linux.org.uk>
> Signed-off-by: Juri Lelli <juri.lelli@arm.com>
> ---
>  arch/arm/kernel/topology.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> index 08b7847..ec279d1 100644
> --- a/arch/arm/kernel/topology.c
> +++ b/arch/arm/kernel/topology.c
> @@ -40,7 +40,7 @@
>   * to run the rebalance_domains for all idle cores and the cpu_capacity can be
>   * updated during this sequence.
>   */
> -static DEFINE_PER_CPU(unsigned long, cpu_scale);
> +static DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
>
>  unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
>  {
> @@ -306,8 +306,6 @@ void __init init_cpu_topology(void)
>                 cpu_topo->socket_id = -1;
>                 cpumask_clear(&cpu_topo->core_sibling);
>                 cpumask_clear(&cpu_topo->thread_sibling);
> -
> -               set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
>         }
>         smp_wmb();

FWIW, Acked-by: Vincent Guittot <vincent.guittot@linaro.org>

>
> --
> 2.2.2
>
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