linux-kernel - Re: [PATCH v2 13/14] mm/ksm: use folio_set_stable_node in try_to_merge_one

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Date: Mon, 25 Mar 2024 20:40:03 +0800
From: Alex Shi <seakeel@...il.com>
To: Matthew Wilcox <willy@...radead.org>, alexs@...nel.org
Cc: Andrea Arcangeli <aarcange@...hat.com>,
 Izik Eidus <izik.eidus@...ellosystems.com>, david@...hat.com,
 Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
 Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH v2 13/14] mm/ksm: use folio_set_stable_node in
 try_to_merge_one_page



On 3/23/24 11:38 AM, Matthew Wilcox wrote:
> On Fri, Mar 22, 2024 at 04:37:00PM +0800, alexs@...nel.org wrote:
>> From: "Alex Shi (tencent)" <alexs@...nel.org>
>>
>> Only single page could be reached where we set stable node after write
>> protect, so use folio converted func to replace page's.
>>
>> Signed-off-by: Alex Shi (tencent) <alexs@...nel.org>
>> Cc: Izik Eidus <izik.eidus@...ellosystems.com>
>> Cc: Matthew Wilcox <willy@...radead.org>
>> Cc: Andrea Arcangeli <aarcange@...hat.com>
>> Cc: Hugh Dickins <hughd@...gle.com>
>> Cc: Chris Wright <chrisw@...s-sol.org>
>> ---
>>  mm/ksm.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/ksm.c b/mm/ksm.c
>> index 15a78a9bab59..d7c4cc4a0cc1 100644
>> --- a/mm/ksm.c
>> +++ b/mm/ksm.c
>> @@ -1518,7 +1518,7 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
>>  			 * PageAnon+anon_vma to PageKsm+NULL stable_node:
>>  			 * stable_tree_insert() will update stable_node.
>>  			 */
>> -			set_page_stable_node(page, NULL);
>> +			folio_set_stable_node(page_folio(page), NULL);
>>  			mark_page_accessed(page);
> 
> I'd rather you did a conversion of try_to_merge_one_page() instead of
> just this.  It'll be a fun one because you'll have to recalculate the
> folio after calling split_huge_page().

Hi Willy,

Definitely right, the merge series funcs need more careful changes. :)
I'd like to left them for late changes.

Thanks