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memory hotplug: migrate swap cache page

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In test, some pages in swap-cache can't be migrated, as they aren't rmap.

unmap_and_move() ignores swap-cache page which is just read in and hasn't
rmap (see the comments in the code), but swap_aops provides .migratepage.
Better to migrate such pages instead of ignore them.

Signed-off-by: Shaohua Li <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Yakui Zhao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shaohua Li 2009-09-21 17:01:19 -07:00 • committed by Linus Torvalds
commit abfc348811
1 changed files with 4 additions and 2 deletions
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6
mm/migrate.c
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@ -147,7 +147,7 @@ out:
static void remove_file_migration_ptes(struct page *old, struct page *new)
{
struct vm_area_struct *vma;
struct address_space *mapping = page_mapping(new);
struct address_space *mapping = new->mapping;
struct prio_tree_iter iter;
pgoff_t pgoff = new->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
@ -664,13 +664,15 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
* needs to be effective.
*/
try_to_free_buffers(page);
goto rcu_unlock;
}
goto rcu_unlock;
goto skip_unmap;
}
/* Establish migration ptes or remove ptes */
try_to_unmap(page, 1);
skip_unmap:
if (!page_mapped(page))
rc = move_to_new_page(newpage, page);