linux-kernel - Re: [PATCH] sched/fair: Update nohz.next

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Message-ID: <21fda84b-3d66-e8c1-f384-026adbc28ac4@arm.com>
Date:   Thu, 15 Jul 2021 14:33:52 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched/fair: Update nohz.next_balance for newly NOHZ-idle
 CPUs

On 14/07/2021 13:39, Valentin Schneider wrote:

[...]

> @@ -8942,6 +8946,10 @@ void __init sched_init(void)
>  			cpumask_size(), GFP_KERNEL, cpu_to_node(i));
>  		per_cpu(select_idle_mask, i) = (cpumask_var_t)kzalloc_node(
>  			cpumask_size(), GFP_KERNEL, cpu_to_node(i));
> +#ifdef CONFIG_NOHZ_COMMON
> +		per_cpu(nohz_balance_mask, i) = (cpumask_var_t)kzalloc_node(
> +			cpumask_size(), GFP_KERNEL, cpu_to_node(i));
> +#endif /* CONFIG_NOHZ_COMMON */
>  	}
>  #endif /* CONFIG_CPUMASK_OFFSTACK */

s/CONFIG_NOHZ_COMMON/CONFIG_NO_HZ_COMMON

Otherwise CONFIG_CPUMASK_OFFSTACK system will have issues.

[...]