linux-kernel - Re: [RFC PATCH 3/6] mm: page_owner: add support for splitting to any order in split page

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Message-ID: <20201116162519.f4n445yku3dp2fhw@box>
Date:   Mon, 16 Nov 2020 19:25:19 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Zi Yan <ziy@...dia.com>
Cc:     linux-mm@...ck.org, Matthew Wilcox <willy@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Yang Shi <shy828301@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        David Nellans <dnellans@...dia.com>
Subject: Re: [RFC PATCH 3/6] mm: page_owner: add support for splitting to any
 order in split page_owner.

On Wed, Nov 11, 2020 at 03:40:05PM -0500, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> It adds a new_order parameter to set new page order in page owner.
> It prepares for upcoming changes to support split huge page to any lower
> order.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---
>  include/linux/page_owner.h | 7 ++++---
>  mm/huge_memory.c           | 2 +-
>  mm/page_alloc.c            | 2 +-
>  mm/page_owner.c            | 6 +++---
>  4 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h
> index 3468794f83d2..215cbb159568 100644
> --- a/include/linux/page_owner.h
> +++ b/include/linux/page_owner.h
> @@ -31,10 +31,11 @@ static inline void set_page_owner(struct page *page,
>  		__set_page_owner(page, order, gfp_mask);
>  }
>  
> -static inline void split_page_owner(struct page *page, unsigned int nr)
> +static inline void split_page_owner(struct page *page, unsigned int nr,
> +			unsigned int new_order)
>  {
>  	if (static_branch_unlikely(&page_owner_inited))
> -		__split_page_owner(page, nr);
> +		__split_page_owner(page, nr, new_order);

Hm. Where do you correct __split_page_owner() declaration. I don't see it.

-- 
 Kirill A. Shutemov