linux-kernel - Re: [PATCH v1 2/4] mm: memcg: merge multiple page

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Date: Fri, 3 May 2024 14:11:17 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Muchun Song <muchun.song@...ux.dev>, Johannes Weiner <hannes@...xchg.org>, 
	Michal Hocko <mhocko@...nel.org>, Frank van der Linden <fvdl@...gle.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/4] mm: memcg: merge multiple page_counters into a
 single structure

On Fri, May 03, 2024 at 01:18:33PM -0700, Roman Gushchin wrote:
[...]
>  enum mem_counter_type {
> +#ifdef CONFIG_MEMCG
>  	MCT_MEMORY,		/* cgroup v1 and v2 */
>  	MCT_SWAP,		/* cgroup v2 only */
>  	MCT_MEMSW = MCT_SWAP,	/* cgroup v1 only */
>  	MCT_KMEM,		/* cgroup v1 only */
>  	MCT_TCPMEM,		/* cgroup v1 only */
> +#endif
> +#ifdef CONFIG_CGROUP_HUGETLB
> +	MCT_HUGETLB_MAX = __MCT_HUGETLB_MAX,
> +#endif
> +	__MCT_NR_ITEMS,
>  };
>  

Thanks for the awesome work. I haven't gone through all the patches yet
but wanted to ask a quick question. In the above enum are you trying to
do a union between memcg and hugetlb? It gave me a big pause to
understand what you are trying to do.