Re: [PATCH 6/7] memcg: add per cgroup writeback pages accounting

[Fengguang Wu <fengguang.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

> @@ -2245,7 +2252,10 @@ int test_set_page_writeback(struct page *page)
>  {
>  	struct address_space *mapping = page_mapping(page);
>  	int ret;
> +	bool locked;
> +	unsigned long flags;
>  
> +	mem_cgroup_begin_update_page_stat(page, &locked, &flags);
>  	if (mapping) {
>  		struct backing_dev_info *bdi = mapping->backing_dev_info;
>  		unsigned long flags;
> @@ -2272,6 +2282,8 @@ int test_set_page_writeback(struct page *page)
>  	}
>  	if (!ret)
>  		account_page_writeback(page);
> +
> +	mem_cgroup_end_update_page_stat(page, &locked, &flags);
>  	return ret;
>  
>  }

Where is the MEM_CGROUP_STAT_FILE_WRITEBACK increased?

Thanks,
Fengguang