Hi.

On Wed, Sep 30, 2020 at 05:27:10PM -0700, Roman Gushchin <guro@fb.com> wrote:
> @@ -369,8 +371,12 @@ enum page_memcg_data_flags {
>   */
>  static inline struct mem_cgroup *page_memcg(struct page *page)
>  {
> +	unsigned long memcg_data = page->memcg_data;
> +
>  	VM_BUG_ON_PAGE(PageSlab(page), page);
> -	return (struct mem_cgroup *)page->memcg_data;
> +	VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_OBJCGS, page);
> +
> +	return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
>  }
Shouldn't this change go also into page_memcg_rcu()? (I don't think the
current single user (workingset_activation() would pass a non-slab
kernel page but for consistency sake.)

Alternatively, I'm thinking why (in its single use) is there
page_memcg_rcu() a separate function to page_memcg() (cross memcg page
migration?).

Regards,
Michal