linux-kernel - Re: [PATCH] cgroup: minor cleanup for cgroup_local_stat

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Date:   Thu, 3 Aug 2023 10:27:58 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, tj@...nel.org, lizefan.x@...edance.com,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: minor cleanup for cgroup_local_stat_show()

On Thu, Aug 03, 2023 at 07:31:23PM +0800, Miaohe Lin wrote:
> Make it under CONFIG_CGROUP_SCHED to rid of __maybe_unused annotation.
> Also put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED as it's only
> called when CONFIG_CGROUP_SCHED. No functional change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>

> @@ -3686,8 +3686,9 @@ static int cpu_stat_show(struct seq_file *seq, void *v)
>  	return ret;
>  }
>  
> -static int __maybe_unused cgroup_local_stat_show(struct seq_file *seq,
> -						 struct cgroup *cgrp, int ssid)
> +#ifdef CONFIG_CGROUP_SCHED
> +static int cgroup_local_stat_show(struct seq_file *seq,
> +				  struct cgroup *cgrp, int ssid)

Andrew, this is based on "sched: add throttled time stat for throttled
children" in -next (coming in from -tip). Hence the routing through
you rather than the cgroup tree.