linux-kernel - Re: [PATCH v2 28/40] mm/memory: page_remove_rmap() -> folio_remove_rmap

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Message-ID: <007e83fa-16c7-4700-b326-ee8cb7809f9f@redhat.com>
Date: Mon, 22 Jan 2024 18:01:58 +0100
From: David Hildenbrand <david@...hat.com>
To: Ryan Roberts <ryan.roberts@....com>, linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 Hugh Dickins <hughd@...gle.com>, Yin Fengwei <fengwei.yin@...el.com>,
 Mike Kravetz <mike.kravetz@...cle.com>, Muchun Song <muchun.song@...ux.dev>,
 Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v2 28/40] mm/memory: page_remove_rmap() ->
 folio_remove_rmap_pte()

On 22.01.24 17:58, Ryan Roberts wrote:
> On 20/12/2023 22:44, David Hildenbrand wrote:
>> Let's convert zap_pte_range() and closely-related
>> tlb_flush_rmap_batch(). While at it, perform some more folio conversion
>> in zap_pte_range().
>>
>> Signed-off-by: David Hildenbrand <david@...hat.com>
>> ---
>>   mm/memory.c     | 23 +++++++++++++----------
>>   mm/mmu_gather.c |  2 +-
>>   2 files changed, 14 insertions(+), 11 deletions(-)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 6552ea27b0bfa..eda2181275d9b 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -1434,6 +1434,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
>>   	arch_enter_lazy_mmu_mode();
>>   	do {
>>   		pte_t ptent = ptep_get(pte);
>> +		struct folio *folio;
>>   		struct page *page;
>>   
>>   		if (pte_none(ptent))
>> @@ -1459,21 +1460,22 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
>>   				continue;
>>   			}
>>   
>> +			folio = page_folio(page);
>>   			delay_rmap = 0;
>> -			if (!PageAnon(page)) {
>> +			if (!folio_test_anon(folio)) {
>>   				if (pte_dirty(ptent)) {
>> -					set_page_dirty(page);
>> +					folio_set_dirty(folio);
> 
> Is this foliation change definitely correct? I note that set_page_dirty() is
> defined as this: >
> bool set_page_dirty(struct page *page)
> {
> 	return folio_mark_dirty(page_folio(page));
> }
> 
> And folio_mark_dirty() is doing more than just setting teh PG_dirty bit. In my
> equivalent change, as part of the contpte series, I've swapped set_page_dirty()
> for folio_mark_dirty().

Good catch, that should be folio_mark_dirty(). Let me send a fixup.

(the difference in naming for both functions really is bad)


-- 
Cheers,

David / dhildenb