linux-kernel - Re: [PATCH 3/3] memcg: simplify and inline __mem_cgroup_from

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Date:	Fri, 16 Oct 2015 15:19:22 -0700
From:	Johannes Weiner <hannes@...xchg.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Vladimir Davydov <vdavydov@...tuozzo.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] memcg: simplify and inline __mem_cgroup_from_kmem

On Fri, Oct 16, 2015 at 03:12:23PM -0700, Hugh Dickins wrote:
> --- 4035m/mm/list_lru.c	2015-10-15 15:26:59.835572128 -0700
> +++ 4035M/mm/list_lru.c	2015-10-16 03:11:51.000000000 -0700
> @@ -63,6 +63,16 @@ list_lru_from_memcg_idx(struct list_lru_
>  	return &nlru->lru;
>  }
>  
> +static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
> +{
> +	struct page *page;
> +
> +	if (!memcg_kmem_enabled())
> +		return NULL;
> +	page = virt_to_head_page(ptr);
> +	return page->mem_cgroup;
> +}
> +
>  static inline struct list_lru_one *
>  list_lru_from_kmem(struct list_lru_node *nlru, void *ptr)
>  {

I like this better than the mm.h include, too.
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