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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-07-26 15:25:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commitdd78fedde4b99b322f2dc849d467d365a82e23ca (patch)
tree5095c6e9fd2527a8636188059e35f7f45b9648a2 /mm/migrate.c
parent7267ec008b5cd8b3579e188b1ff238815643e372 (diff)
downloadop-kernel-dev-dd78fedde4b99b322f2dc849d467d365a82e23ca.zip
op-kernel-dev-dd78fedde4b99b322f2dc849d467d365a82e23ca.tar.gz
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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index f278005..e85a72c 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);
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