linux-kernel - Re: [PATCH v6 13/17] mm: Export mem_cgroup_is

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Date:   Sun, 20 May 2018 10:57:22 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     akpm@...ux-foundation.org, shakeelb@...gle.com,
        viro@...iv.linux.org.uk, hannes@...xchg.org, mhocko@...nel.org,
        tglx@...utronix.de, pombredanne@...b.com, stummala@...eaurora.org,
        gregkh@...uxfoundation.org, sfr@...b.auug.org.au, guro@...com,
        mka@...omium.org, penguin-kernel@...ove.SAKURA.ne.jp,
        chris@...is-wilson.co.uk, longman@...hat.com, minchan@...nel.org,
        ying.huang@...el.com, mgorman@...hsingularity.net, jbacik@...com,
        linux@...ck-us.net, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, willy@...radead.org, lirongqing@...du.com,
        aryabinin@...tuozzo.com
Subject: Re: [PATCH v6 13/17] mm: Export mem_cgroup_is_root()

On Fri, May 18, 2018 at 11:43:53AM +0300, Kirill Tkhai wrote:
> This will be used in next patch.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
> ---
>  include/linux/memcontrol.h |   10 ++++++++++
>  mm/memcontrol.c            |    5 -----
>  2 files changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 7ae1b94becf3..cd44c1fac22b 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -311,6 +311,11 @@ struct mem_cgroup {
>  
>  extern struct mem_cgroup *root_mem_cgroup;
>  
> +static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
> +{
> +	return (memcg == root_mem_cgroup);
> +}
> +
>  static inline bool mem_cgroup_disabled(void)
>  {
>  	return !cgroup_subsys_enabled(memory_cgrp_subsys);
> @@ -780,6 +785,11 @@ void mem_cgroup_split_huge_fixup(struct page *head);
>  
>  struct mem_cgroup;
>  
> +static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
> +{
> +	return false;
> +}
> +

This stub must return true as one can think of !MEMCG as of the case
when there's the only cgroup - the root.