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| author | Kirill A. Shutemov | 2016-03-17 22:20:07 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2016-03-17 23:09:34 +0100 |
| commit | e388466de4a2a1a50c43bfaeacc0c8254d9e7cb2 (patch) | |
| tree | decd9831aa60379c8937fd54bade4fd171247ade /mm/migrate.c | |
| parent | rmap: extend try_to_unmap() to be usable by split_huge_page() (diff) | |
| download | kernel-qcow2-linux-e388466de4a2a1a50c43bfaeacc0c8254d9e7cb2.tar.gz kernel-qcow2-linux-e388466de4a2a1a50c43bfaeacc0c8254d9e7cb2.tar.xz kernel-qcow2-linux-e388466de4a2a1a50c43bfaeacc0c8254d9e7cb2.zip | |
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>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 577c94b8e959..6c822a7b27e0 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -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); |