linux-kernel - Re: [PATCH v5 03/11] mm: memcontrol: prepare objcg API for non-kmem usage

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Date:   Thu, 2 Jun 2022 11:06:35 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...ux.dev,
        shakeelb@...gle.com, akpm@...ux-foundation.org,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, duanxiongchun@...edance.com,
        longman@...hat.com
Subject: Re: [PATCH v5 03/11] mm: memcontrol: prepare objcg API for non-kmem
 usage

On Wed, Jun 01, 2022 at 07:34:34PM +0200, Michal Koutný wrote:
> Hello.
> 
> On Mon, May 30, 2022 at 03:49:11PM +0800, Muchun Song <songmuchun@...edance.com> wrote:
> > So we also allocate an object cgroup for the root_mem_cgroup.
> 
> This change made me wary that this patch also kmem charging in the
> root_mem_cgroup. Fortunately, get_obj_cgroup_from_current won't return

Sorry for the confusing.  Right, we don't charge kmem to the root objcg.

> this objcg so all is fine.
> 
> > +}
> > +#else
> > +static inline void obj_cgroup_release_bytes(struct obj_cgroup *objcg)
> > +{
> > +}
> > +#endif
> 
> This empty body is for !CONFIG_MEMCG_KMEM, however, the subsequent use for LRU
> pages makes no use of these, so it's warranted.
> 
> Altogether, I find this correct, hence
> Reviewed-by: Michal Koutný <mkoutny@...e.com>
>

Thanks Michal.