Re: [PATCH v2 6/8] sched/idle: Move busy_cpu accounting to idle callback

[Valentin Schneider <valentin.schneider@arm.com>]

On 06/05/21 22:15, Srikar Dronamraju wrote:
> diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> index 8db40c8a6ad0..00e4669bb241 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -647,6 +647,7 @@ DEFINE_PER_CPU(int, sd_llc_id);
>  #ifdef CONFIG_SCHED_SMT
>  DEFINE_PER_CPU(int, smt_id);
>  #endif
> +DEFINE_PER_CPU(int, is_idle);

This + patch 8 immediately reminds me of Aubrey's patch:

  http://lore.kernel.org/r/1615872606-56087-1-git-send-email-aubrey.li@intel.com

last I looked it seemed OK, even the test bot seems happy. Aubrey, did you
have any more work to do on that one (other than rebasing)?

>  DEFINE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
>  DEFINE_PER_CPU(struct sched_domain __rcu *, sd_numa);
>  DEFINE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
> @@ -673,6 +674,7 @@ static void update_top_cache_domain(int cpu)
>  #ifdef CONFIG_SCHED_SMT
>       per_cpu(smt_id, cpu) = cpumask_first(cpu_smt_mask(cpu));
>  #endif
> +	per_cpu(is_idle, cpu) = 1;
>       rcu_assign_pointer(per_cpu(sd_llc_shared, cpu), sds);
>
>       sd = lowest_flag_domain(cpu, SD_NUMA);
> --
> 2.18.2