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 10:21:09 -0500
From: Zi Yan <ziy@...dia.com>
To: David Hildenbrand <david@...hat.com>
Cc: "\"Pankaj Raghav (Samsung)\"" <kernel@...kajraghav.com>,
 linux-mm@...ck.org, "\"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 14 Feb 2024, at 4:14, David Hildenbrand wrote:

> 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.

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

Thanks.

--
Best Regards,
Yan, Zi

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