linux-kernel - Re: [PATCH 5/6] mm/page_io: convert count_swpout_vm

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Date:   Tue, 18 Jul 2023 20:56:45 +0800
From:   "zhangpeng (AS)" <zhangpeng362@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <sidhartha.kumar@...cle.com>, <akpm@...ux-foundation.org>,
        <wangkefeng.wang@...wei.com>, <sunnanyong@...wei.com>
Subject: Re: [PATCH 5/6] mm/page_io: convert count_swpout_vm_event() to take
 in a folio

On 2023/7/17 21:48, Matthew Wilcox wrote:

> On Mon, Jul 17, 2023 at 09:26:01PM +0800, Peng Zhang wrote:
>> -static inline void count_swpout_vm_event(struct page *page)
>> +static inline void count_swpout_vm_event(struct folio *folio)
>>   {
>>   #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> -	if (unlikely(PageTransHuge(page)))
>> +	if (unlikely(folio_test_large(folio)))
>>   		count_vm_event(THP_SWPOUT);
>>   #endif
> Since this is a THP_SWPOUT event, we should do this as:
>
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> -	if (unlikely(PageTransHuge(page)))
> +	if (folio_test_pmd_mappable(folio))
> 		count_vm_event(THP_SWPOUT);
> -#endif

Agreed. I'll convert PageTransHuge to folio_test_pmd_mappable.

-- 
Best Regards,
Peng