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mm: make remove_migration_ptes() beyond mm/migration.c 

Make remove_migration_ptes() available to be used in split_huge_page().

New parameter 'locked' added: as with try_to_umap() we need a way to
indicate that caller holds rmap lock.

We also shouldn't try to mlock() pte-mapped huge pages: pte-mapeed THP
pages are never mlocked.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
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 2016-03-17 14:20:07 -07:00 committed by Linus Torvalds
parent 2a52bcbcc6
commit e388466de4
2 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/rmap.h
View File

@ -243,6 +243,8 @@ int page_mkclean(struct page *);
*/
int try_to_munlock(struct page *);
void remove_migration_ptes(struct page *old, struct page *new, bool locked);
/*
* Called by memory-failure.c to kill processes.
*/

15
mm/migrate.c
View File

@ -172,7 +172,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
else
page_add_file_rmap(new);
if (vma->vm_flags & VM_LOCKED)
if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
mlock_vma_page(new);
/* No need to invalidate - it was non-present before */
@ -187,14 +187,17 @@ out:
* Get rid of all migration entries and replace them by
* references to the indicated page.
*/
static void remove_migration_ptes(struct page *old, struct page *new)
void remove_migration_ptes(struct page *old, struct page *new, bool locked)
{
struct rmap_walk_control rwc = {
.rmap_one = remove_migration_pte,
.arg = old,
};
rmap_walk(new, &rwc);
if (locked)
rmap_walk_locked(new, &rwc);
else
rmap_walk(new, &rwc);
}
/*
@ -702,7 +705,7 @@ static int writeout(struct address_space *mapping, struct page *page)
* At this point we know that the migration attempt cannot
* be successful.
*/
remove_migration_ptes(page, page);
remove_migration_ptes(page, page, false);
rc = mapping->a_ops->writepage(page, &wbc);
@ -900,7 +903,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
if (page_was_mapped)
remove_migration_ptes(page,
rc == MIGRATEPAGE_SUCCESS ? newpage : page);
rc == MIGRATEPAGE_SUCCESS ? newpage : page, false);
out_unlock_both:
unlock_page(newpage);
@ -1070,7 +1073,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
if (page_was_mapped)
remove_migration_ptes(hpage,
rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage);
rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage, false);
unlock_page(new_hpage);