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authorDavid Hildenbrand <david@redhat.com>2023-12-20 23:44:57 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-12-29 11:58:55 -0800
commitd8ef5e311d7bfde54b60ab45026f206eff31b2d2 (patch)
tree01ace24b066834f99abe54b038c37921c33d6d6b /include/linux/rmap.h
parent4d8f7418e8ba36036c8486d92d9591c368ab9b85 (diff)
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mm/rmap: convert page_dup_file_rmap() to folio_dup_file_rmap_[pte|ptes|pmd]()
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@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Peter Xu <peterx@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Yin Fengwei <fengwei.yin@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
-rw-r--r--include/linux/rmap.h59
1 files changed, 54 insertions, 5 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index fef369e37039..7607f862e795 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -308,6 +308,60 @@ static inline void hugetlb_remove_rmap(struct folio *folio)
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(struct page *page, bool compound)
}
}
-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