linux-kernel - Re: [PATCH 6/9] sched/psi: save percpu memory when !psi_cgroups

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Message-ID: <Yt7JMfKHYFLGUGBb@cmpxchg.org>
Date:   Mon, 25 Jul 2022 12:47:45 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Chengming Zhou <zhouchengming@...edance.com>
Cc:     surenb@...gle.com, mingo@...hat.com, peterz@...radead.org,
        tj@...nel.org, corbet@....net, akpm@...ux-foundation.org,
        rdunlap@...radead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, songmuchun@...edance.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH 6/9] sched/psi: save percpu memory when
 !psi_cgroups_enabled

On Thu, Jul 21, 2022 at 12:04:36PM +0800, Chengming Zhou wrote:
> We won't use cgroup psi_group when !psi_cgroups_enabled, so don't
> bother to alloc percpu memory and init for it.
> 
> Also don't need to migrate task PSI stats between cgroups in
> cgroup_move_task().
> 
> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>

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