linux-kernel - Re: [PATCH 4/6] arm: wire cpu-invariant accounting support up to the task scheduler

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Message-ID: <CAKfTPtDminixSd+KKt4tRWUBF3ere8oQdzP-XOKpmmmkCAhX6g@mail.gmail.com>
Date:   Mon, 12 Jun 2017 16:31:52 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Juri Lelli <juri.lelli@....com>,
        Vincent Guittot <vincent.guittot@...aor.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Morten Rasmussen <morten.rasmussen@....com>
Subject: Re: [PATCH 4/6] arm: wire cpu-invariant accounting support up to the
 task scheduler

On 8 June 2017 at 09:55, Dietmar Eggemann <dietmar.eggemann@....com> wrote:
> Commit 8cd5601c5060 ("sched/fair: Convert arch_scale_cpu_capacity() from
> weak function to #define") changed the wiring which now has to be done
> by associating arch_scale_cpu_capacity with the actual implementation
> provided by the architecture.
>
> Define arch_scale_cpu_capacity to use the arch_topology "driver"
> function topology_get_cpu_scale() for the task scheduler's cpu-invariant
> accounting instead of the default arch_scale_cpu_capacity() in
> kernel/sched/sched.h.
>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Juri Lelli <juri.lelli@....com>
> Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>

Acked-by: Vincent Guittot <vincent.guittot@...aro.org>

> ---
>  arch/arm/include/asm/topology.h | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
> index a56a9e24f4c0..b713e7223bc4 100644
> --- a/arch/arm/include/asm/topology.h
> +++ b/arch/arm/include/asm/topology.h
> @@ -29,6 +29,9 @@ const struct cpumask *cpu_coregroup_mask(int cpu);
>  /* Replace task scheduler's default frequency-invariant accounting */
>  #define arch_scale_freq_capacity topology_get_freq_scale
>
> +/* Replace task scheduler's default cpu-invariant accounting */
> +#define arch_scale_cpu_capacity topology_get_cpu_scale
> +
>  #else
>
>  static inline void init_cpu_topology(void) { }
> --
> 2.11.0
>