The quilt patch titled
Subject: mm/rmap: convert page_dup_file_rmap() to folio_dup_file_rmap_[pte|ptes|pmd]()
has been removed from the -mm tree. Its filename was
mm-rmap-convert-page_dup_file_rmap-to-folio_dup_file_rmap_.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: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/rmap: convert page_dup_file_rmap() to folio_dup_file_rmap_[pte|ptes|pmd]()
Date: Wed, 20 Dec 2023 23:44:57 +0100
Let's convert page_dup_file_rmap() like the other rmap functions. As
there is only a single caller, convert that single caller right away and
remove page_dup_file_rmap().
Add folio_dup_file_rmap_ptes() right away, we want to perform rmap baching
during fork() soon.
Link: https://lkml.kernel.org/r/20231220224504.646757-34-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rmap.h | 59 +++++++++++++++++++++++++++++++++++++----
mm/memory.c | 2 -
2 files changed, 55 insertions(+), 6 deletions(-)
--- a/include/linux/rmap.h~mm-rmap-convert-page_dup_file_rmap-to-folio_dup_file_rmap_
+++ a/include/linux/rmap.h
@@ -308,6 +308,60 @@ static inline void hugetlb_remove_rmap(s
atomic_dec(&folio->_entire_mapcount);
}
+static __always_inline void __folio_dup_file_rmap(struct folio *folio,
+ struct page *page, int nr_pages, enum rmap_level level)
+{
+ __folio_rmap_sanity_checks(folio, page, nr_pages, level);
+
+ switch (level) {
+ case RMAP_LEVEL_PTE:
+ do {
+ atomic_inc(&page->_mapcount);
+ } while (page++, --nr_pages > 0);
+ break;
+ case RMAP_LEVEL_PMD:
+ atomic_inc(&folio->_entire_mapcount);
+ break;
+ }
+}
+
+/**
+ * folio_dup_file_rmap_ptes - duplicate PTE mappings of a page range of a folio
+ * @folio: The folio to duplicate the mappings of
+ * @page: The first page to duplicate the mappings of
+ * @nr_pages: The number of pages of which the mapping will be duplicated
+ *
+ * The page range of the folio is defined by [page, page + nr_pages)
+ *
+ * The caller needs to hold the page table lock.
+ */
+static inline void folio_dup_file_rmap_ptes(struct folio *folio,
+ struct page *page, int nr_pages)
+{
+ __folio_dup_file_rmap(folio, page, nr_pages, RMAP_LEVEL_PTE);
+}
+#define folio_dup_file_rmap_pte(folio, page) \
+ folio_dup_file_rmap_ptes(folio, page, 1)
+
+/**
+ * folio_dup_file_rmap_pmd - duplicate a PMD mapping of a page range of a folio
+ * @folio: The folio to duplicate the mapping of
+ * @page: The first page to duplicate the mapping of
+ *
+ * The page range of the folio is defined by [page, page + HPAGE_PMD_NR)
+ *
+ * The caller needs to hold the page table lock.
+ */
+static inline void folio_dup_file_rmap_pmd(struct folio *folio,
+ struct page *page)
+{
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+ __folio_dup_file_rmap(folio, page, HPAGE_PMD_NR, RMAP_LEVEL_PTE);
+#else
+ WARN_ON_ONCE(true);
+#endif
+}
+
static inline void __page_dup_rmap(struct page *page, bool compound)
{
VM_WARN_ON(folio_test_hugetlb(page_folio(page)));
@@ -322,11 +376,6 @@ static inline void __page_dup_rmap(struc
}
}
-static inline void page_dup_file_rmap(struct page *page, bool compound)
-{
- __page_dup_rmap(page, compound);
-}
-
/**
* page_try_dup_anon_rmap - try duplicating a mapping of an already mapped
* anonymous page
--- a/mm/memory.c~mm-rmap-convert-page_dup_file_rmap-to-folio_dup_file_rmap_
+++ a/mm/memory.c
@@ -965,7 +965,7 @@ copy_present_pte(struct vm_area_struct *
rss[MM_ANONPAGES]++;
} else if (page) {
folio_get(folio);
- page_dup_file_rmap(page, false);
+ folio_dup_file_rmap_pte(folio, page);
rss[mm_counter_file(page)]++;
}
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
