thp: vma_adjust_trans_huge(): adjust file-backed VMA too

This series of patches adds support for using PMD page table entries to
map DAX files.  We expect NV-DIMMs to start showing up that are many
gigabytes in size and the memory consumption of 4kB PTEs will be
astronomical.

The patch series leverages much of the Transparant Huge Pages
infrastructure, going so far as to borrow one of Kirill's patches from
his THP page cache series.

This patch (of 10):

Since we're going to have huge pages in page cache, we need to call adjust
file-backed VMA, which potentially can contain huge pages.

For now we call it for all VMAs.

Probably later we will need to introduce a flag to indicate that the VMA
has huge pages.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index f10b20f051599287a40188d322ead088726e2296..1c53c7d7ef7e6048a6c2fb2746e82c74c41afa20 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -122,7 +122,7 @@ extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
 #endif
 extern int hugepage_madvise(struct vm_area_struct *vma,
                            unsigned long *vm_flags, int advice);
-extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
+extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
                                    unsigned long start,
                                    unsigned long end,
                                    long adjust_next);
@@ -138,15 +138,6 @@ static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
        else
                return 0;
 }
-static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
-                                        unsigned long start,
-                                        unsigned long end,
-                                        long adjust_next)
-{
-       if (!vma->anon_vma || vma->vm_ops)
-               return;
-       __vma_adjust_trans_huge(vma, start, end, adjust_next);
-}
 static inline int hpage_nr_pages(struct page *page)
 {
        if (unlikely(PageTransHuge(page)))

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 279a818a39b13d76e574bf8f330c7c925b8e3a67..4d5fcb630d321ddc8de3fb913347808111e64ff2 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2991,7 +2991,7 @@ static void split_huge_page_address(struct mm_struct *mm,
        split_huge_page_pmd_mm(mm, address, pmd);
 }
 
-void __vma_adjust_trans_huge(struct vm_area_struct *vma,
+void vma_adjust_trans_huge(struct vm_area_struct *vma,
                             unsigned long start,
                             unsigned long end,
                             long adjust_next)