The quilt patch titled
Subject: mm: add folio_estimated_sharers()
has been removed from the -mm tree. Its filename was
mm-add-folio_estimated_sharers.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Vishal Moola (Oracle)" <vishal.moola@xxxxxxxxx>
Subject: mm: add folio_estimated_sharers()
Date: Mon, 30 Jan 2023 12:18:28 -0800
Patch series "Convert various mempolicy.c functions to use folios", v4.
This patch series converts migrate_page_add() and queue_pages_required()
to migrate_folio_add() and queue_page_required(). It also converts the
callers of the functions to use folios as well, and introduces a helper
function to estimate the number of sharers of a folio.
This patch (of 6):
folio_estimated_sharers() takes in a folio and returns the precise number
of times the first subpage of the folio is mapped.
This function aims to provide an estimate for the number of sharers of a
folio. This is necessary for folio conversions where we care about the
number of processes that share a folio, but don't necessarily want to
check every single page within that folio.
This is in contrast to folio_mapcount() which calculates the total number
of the times a folio and all its subpages are mapped.
Link: https://lkml.kernel.org/r/20230130201833.27042-1-vishal.moola@xxxxxxxxx
Link: https://lkml.kernel.org/r/20230130201833.27042-2-vishal.moola@xxxxxxxxx
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Reviewed-by: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jane Chu <jane.chu@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/include/linux/mm.h~mm-add-folio_estimated_sharers
+++ a/include/linux/mm.h
@@ -1916,6 +1916,24 @@ static inline size_t folio_size(struct f
return PAGE_SIZE << folio_order(folio);
}
+/**
+ * folio_estimated_sharers - Estimate the number of sharers of a folio.
+ * @folio: The folio.
+ *
+ * folio_estimated_sharers() aims to serve as a function to efficiently
+ * estimate the number of processes sharing a folio. This is done by
+ * looking at the precise mapcount of the first subpage in the folio, and
+ * assuming the other subpages are the same. This may not be true for large
+ * folios. If you want exact mapcounts for exact calculations, look at
+ * page_mapcount() or folio_total_mapcount().
+ *
+ * Return: The estimated number of processes sharing a folio.
+ */
+static inline int folio_estimated_sharers(struct folio *folio)
+{
+ return page_mapcount(folio_page(folio, 0));
+}
+
#ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
static inline int arch_make_page_accessible(struct page *page)
{
_
Patches currently in -mm which might be from vishal.moola@xxxxxxxxx are
