From: "Vishal Moola (Oracle)" <vishal.moola@gmail.com>
To: linux-mm@kvack.org
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
"Vishal Moola (Oracle)" <vishal.moola@gmail.com>
Subject: [PATCH mm-unstable v2 1/6] mm: Add folio_estimated_mapcount()
Date: Mon, 23 Jan 2023 17:22:05 -0800 [thread overview]
Message-ID: <20230124012210.13963-2-vishal.moola@gmail.com> (raw)
In-Reply-To: <20230124012210.13963-1-vishal.moola@gmail.com>
folio_estimated_mapcount() takes in a folio and calls page_mapcount() on
the first page of that folio.
This is necessary for folio conversions where we only care about either the
entire_mapcount of a large folio, or the mapcount of a not large folio.
This is in contrast to folio_mapcount() which calculates the total
number of the times a folio and its subpages are mapped.
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
include/linux/mm.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c9db257f09b3..543c360f7ecc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -875,6 +875,11 @@ static inline int page_mapcount(struct page *page)
return mapcount;
}
+static inline int folio_estimated_mapcount(struct folio *folio)
+{
+ return page_mapcount(folio_page(folio, 0));
+}
+
int folio_total_mapcount(struct folio *folio);
/**
--
2.38.1
next prev parent reply other threads:[~2023-01-24 1:22 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 1:22 [PATCH mm-unstable v2 0/6] Convert various mempolicy.c functions Vishal Moola (Oracle)
2023-01-24 1:22 ` Vishal Moola (Oracle) [this message]
2023-01-24 3:23 ` [PATCH mm-unstable v2 1/6] mm: Add folio_estimated_mapcount() kernel test robot
2023-01-25 10:20 ` David Hildenbrand
2023-01-25 10:24 ` David Hildenbrand
2023-01-25 21:29 ` David Hildenbrand
2023-01-25 22:09 ` Vishal Moola
2023-01-26 8:37 ` David Hildenbrand
2023-01-28 0:48 ` Jane Chu
2023-01-30 9:34 ` David Hildenbrand
2023-01-28 13:20 ` Yin, Fengwei
2023-01-24 1:22 ` [PATCH mm-unstable v2 2/6] mm/mempolicy: Convert queue_pages_pmd() to queue_folios_pmd() Vishal Moola (Oracle)
2023-01-24 1:22 ` [PATCH mm-unstable v2 3/6] mm/mempolicy: Convert queue_pages_pte_range() to queue_folios_pte_range() Vishal Moola (Oracle)
2023-01-24 1:22 ` [PATCH mm-unstable v2 4/6] mm/mempolicy: Convert queue_pages_hugetlb() to queue_folios_hugetlb() Vishal Moola (Oracle)
2023-01-24 1:22 ` [PATCH mm-unstable v2 5/6] mm/mempolicy: Convert queue_pages_required() to queue_folio_required() Vishal Moola (Oracle)
2023-01-24 1:22 ` [PATCH mm-unstable v2 6/6] mm/mempolicy: Convert migrate_page_add() to migrate_folio_add() Vishal Moola (Oracle)
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