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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>
This commit is contained in:
Kirill A. Shutemov 2015-09-08 14:58:37 -07:00 committed by Linus Torvalds
parent ce75799b83
commit e1b9996b85
2 changed files with 2 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/huge_mm.h
View File

@ -122,7 +122,7 @@ extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
#endif #endif
extern int hugepage_madvise(struct vm_area_struct *vma, extern int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice); 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 start,
unsigned long end, unsigned long end,
long adjust_next); long adjust_next);
@ -138,15 +138,6 @@ static inline int pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma,
else else
return 0; 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) static inline int hpage_nr_pages(struct page *page)
{ {
if (unlikely(PageTransHuge(page))) if (unlikely(PageTransHuge(page)))

2
mm/huge_memory.c
View File

@ -2991,7 +2991,7 @@ static void split_huge_page_address(struct mm_struct *mm,
split_huge_page_pmd_mm(mm, address, pmd); 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 start,
unsigned long end, unsigned long end,
long adjust_next) long adjust_next)