linux-kernel - Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL

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Date:   Mon, 3 Feb 2020 16:53:20 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 10/12] mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN)
 reporting

On Fri, Jan 31, 2020 at 07:40:27PM -0800, John Hubbard wrote:
> diff --git a/mm/gup.c b/mm/gup.c
> index c10d0d051c5b..9fe61d15fc0e 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -29,6 +29,19 @@ struct follow_page_context {
>  	unsigned int page_mask;
>  };
>  
> +#ifdef CONFIG_DEBUG_VM

Why under CONFIG_DEBUG_VM? There's nothing about this in the cover letter.

> +static inline void __update_proc_vmstat(struct page *page,
> +					enum node_stat_item item, int count)
> +{
> +	mod_node_page_state(page_pgdat(page), item, count);
> +}
> +#else
> +static inline void __update_proc_vmstat(struct page *page,
> +					enum node_stat_item item, int count)
> +{
> +}
> +#endif
> +
>  static void hpage_pincount_add(struct page *page, int refs)
>  {
>  	VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
-- 
 Kirill A. Shutemov