linux-kernel - Re: [PATCH v4 2/7] mm/page_owner: use order instead of nr in split_page

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Date: Wed, 14 Feb 2024 10:14:05 +0100
From: David Hildenbrand <david@...hat.com>
To: Zi Yan <ziy@...dia.com>, "Pankaj Raghav (Samsung)"
 <kernel@...kajraghav.com>, linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 Yang Shi <shy828301@...il.com>, Yu Zhao <yuzhao@...gle.com>,
 "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 Ryan Roberts <ryan.roberts@....com>, Michal Koutný
 <mkoutny@...e.com>, Roman Gushchin <roman.gushchin@...ux.dev>,
 Zach O'Keefe <zokeefe@...gle.com>, Hugh Dickins <hughd@...gle.com>,
 Mcgrof Chamberlain <mcgrof@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 2/7] mm/page_owner: use order instead of nr in
 split_page_owner()

On 13.02.24 22:55, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> We do not have non power of two pages, using nr is error prone if nr
> is not power-of-two. Use page order instead.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---
>   include/linux/page_owner.h | 8 ++++----
>   mm/huge_memory.c           | 2 +-
>   mm/page_alloc.c            | 4 ++--
>   mm/page_owner.c            | 3 ++-
>   4 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h
> index 119a0c9d2a8b..d7878523adfc 100644
> --- a/include/linux/page_owner.h
> +++ b/include/linux/page_owner.h
> @@ -11,7 +11,7 @@ extern struct page_ext_operations page_owner_ops;
>   extern void __reset_page_owner(struct page *page, unsigned short order);
>   extern void __set_page_owner(struct page *page,
>   			unsigned short order, gfp_t gfp_mask);
> -extern void __split_page_owner(struct page *page, unsigned int nr);
> +extern void __split_page_owner(struct page *page, int order);
>   extern void __folio_copy_owner(struct folio *newfolio, struct folio *old);
>   extern void __set_page_owner_migrate_reason(struct page *page, int reason);
>   extern void __dump_page_owner(const struct page *page);
> @@ -31,10 +31,10 @@ 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, int order)
>   {
>   	if (static_branch_unlikely(&page_owner_inited))
> -		__split_page_owner(page, nr);
> +		__split_page_owner(page, order);
>   }
>   static inline void folio_copy_owner(struct folio *newfolio, struct folio *old)
>   {
> @@ -60,7 +60,7 @@ static inline void set_page_owner(struct page *page,
>   {
>   }
>   static inline void split_page_owner(struct page *page,
> -			unsigned short order)
> +			int order)

I assume this will fit into a single line now.

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb