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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-07-26 15:25:26 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-26 16:19:19 -0700 |
| commit | dd78fedde4b99b322f2dc849d467d365a82e23ca (patch) | |
| tree | 5095c6e9fd2527a8636188059e35f7f45b9648a2 /mm/migrate.c | |
| parent | mm: postpone page table allocation until we have page to map (diff) | |
| download | wireguard-linux-dd78fedde4b99b322f2dc849d467d365a82e23ca.tar.xz wireguard-linux-dd78fedde4b99b322f2dc849d467d365a82e23ca.zip | |
rmap: support file thp
Naive approach: on mapping/unmapping the page as compound we update
->_mapcount on each 4k page. That's not efficient, but it's not obvious
how we can optimize this. We can look into optimization later.
PG_double_map optimization doesn't work for file pages since lifecycle
of file pages is different comparing to anon pages: file page can be
mapped again at any time.
Link: http://lkml.kernel.org/r/1466021202-61880-11-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index f278005f609c..e85a72c0d6f0 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -259,7 +259,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma, } else if (PageAnon(new)) page_add_anon_rmap(new, vma, addr, false); else - page_add_file_rmap(new); + page_add_file_rmap(new, false); if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new)) mlock_vma_page(new); |