linux-kernel - Re: [PATCH 1/6] mm: ksm: use more folio api in ksm_might_need_to

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Date:   Wed, 8 Nov 2023 09:40:09 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 1/6] mm: ksm: use more folio api in
 ksm_might_need_to_copy()



On 2023/11/7 22:24, Matthew Wilcox wrote:
> On Tue, Nov 07, 2023 at 09:52:11PM +0800, Kefeng Wang wrote:
>>   struct page *ksm_might_need_to_copy(struct page *page,
>> -			struct vm_area_struct *vma, unsigned long address)
>> +			struct vm_area_struct *vma, unsigned long addr)
>>   {
>>   	struct folio *folio = page_folio(page);
>>   	struct anon_vma *anon_vma = folio_anon_vma(folio);
>> -	struct page *new_page;
>> +	struct folio *new_folio;
>>   
>> -	if (PageKsm(page)) {
>> -		if (page_stable_node(page) &&
>> +	if (folio_test_ksm(folio)) {
>> +		if (folio_stable_node(folio) &&
>>   		    !(ksm_run & KSM_RUN_UNMERGE))
>>   			return page;	/* no need to copy it */
>>   	} else if (!anon_vma) {
>>   		return page;		/* no need to copy it */
>> -	} else if (page->index == linear_page_index(vma, address) &&
>> +	} else if (page->index == linear_page_index(vma, addr) &&
> 
> Hmm.  page->index is going away.  What should we do here instead?

Do you mean to replace page->index to folio->index, or kill index from
struct page?

> 
> The rest of this looks good.
>