linux-kernel - Re: [PATCH -next v2 1/2] memcg: move mem_cgroup

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Message-ID: <aTko72qBxxm2YzHT@tiehlicka>
Date: Wed, 10 Dec 2025 09:01:51 +0100
From: Michal Hocko <mhocko@...e.com>
To: Chen Ridong <chenridong@...weicloud.com>
Cc: hannes@...xchg.org, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
	muchun.song@...ux.dev, akpm@...ux-foundation.org,
	axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com,
	david@...nel.org, zhengqi.arch@...edance.com,
	lorenzo.stoakes@...cle.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	lujialin4@...wei.com
Subject: Re: [PATCH -next v2 1/2] memcg: move mem_cgroup_usage memcontrol-v1.c

On Wed 10-12-25 07:11:41, Chen Ridong wrote:
> From: Chen Ridong <chenridong@...wei.com>
> 
> Currently, mem_cgroup_usage is only used for v1, just move it to
> memcontrol-v1.c
> 
> Signed-off-by: Chen Ridong <chenridong@...wei.com>

Makes sense
Acked-by: Michal Hocko <mhocko@...e.com>
Thanks

> ---
>  mm/memcontrol-v1.c | 22 ++++++++++++++++++++++
>  mm/memcontrol-v1.h |  2 --
>  mm/memcontrol.c    | 22 ----------------------
>  3 files changed, 22 insertions(+), 24 deletions(-)
> 
> diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
> index 6eed14bff742..0b50cb122ff3 100644
> --- a/mm/memcontrol-v1.c
> +++ b/mm/memcontrol-v1.c
> @@ -427,6 +427,28 @@ static int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css,
>  }
>  #endif
>  
> +static unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
> +{
> +	unsigned long val;
> +
> +	if (mem_cgroup_is_root(memcg)) {
> +		/*
> +		 * Approximate root's usage from global state. This isn't
> +		 * perfect, but the root usage was always an approximation.
> +		 */
> +		val = global_node_page_state(NR_FILE_PAGES) +
> +			global_node_page_state(NR_ANON_MAPPED);
> +		if (swap)
> +			val += total_swap_pages - get_nr_swap_pages();
> +	} else {
> +		if (!swap)
> +			val = page_counter_read(&memcg->memory);
> +		else
> +			val = page_counter_read(&memcg->memsw);
> +	}
> +	return val;
> +}
> +
>  static void __mem_cgroup_threshold(struct mem_cgroup *memcg, bool swap)
>  {
>  	struct mem_cgroup_threshold_ary *t;
> diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
> index 6358464bb416..e92b21af92b1 100644
> --- a/mm/memcontrol-v1.h
> +++ b/mm/memcontrol-v1.h
> @@ -22,8 +22,6 @@
>  	     iter != NULL;				\
>  	     iter = mem_cgroup_iter(NULL, iter, NULL))
>  
> -unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap);
> -
>  void drain_all_stock(struct mem_cgroup *root_memcg);
>  
>  unsigned long memcg_events(struct mem_cgroup *memcg, int event);
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e2e49f4ec9e0..dbe7d8f93072 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3272,28 +3272,6 @@ void folio_split_memcg_refs(struct folio *folio, unsigned old_order,
>  	css_get_many(&__folio_memcg(folio)->css, new_refs);
>  }
>  
> -unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
> -{
> -	unsigned long val;
> -
> -	if (mem_cgroup_is_root(memcg)) {
> -		/*
> -		 * Approximate root's usage from global state. This isn't
> -		 * perfect, but the root usage was always an approximation.
> -		 */
> -		val = global_node_page_state(NR_FILE_PAGES) +
> -			global_node_page_state(NR_ANON_MAPPED);
> -		if (swap)
> -			val += total_swap_pages - get_nr_swap_pages();
> -	} else {
> -		if (!swap)
> -			val = page_counter_read(&memcg->memory);
> -		else
> -			val = page_counter_read(&memcg->memsw);
> -	}
> -	return val;
> -}
> -
>  static int memcg_online_kmem(struct mem_cgroup *memcg)
>  {
>  	struct obj_cgroup *objcg;
> -- 
> 2.34.1
> 

-- 
Michal Hocko
SUSE Labs