linux-kernel - Re: [PATCH v2 6/8] sched/idle: Move busy

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Date:   Tue, 11 May 2021 12:51:41 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...riel.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Parth Shah <parth@...ux.ibm.com>,
        Aubrey Li <aubrey.li@...el.com>
Subject: Re: [PATCH v2 6/8] sched/idle: Move busy_cpu accounting to idle callback

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