https://virtuozzo.atlassian.net/browse/PSBM-153264
Charan Teja Kalla (1):
mm: migrate high-order folios in swap cache correctly
Pavel Tikhomirov (1):
mm: migrate page private for high-order folios in swap cache correctly
mm/migrate.c | 13 -
1 file changed, 12 insertions(+), 1 d
From: Charan Teja Kalla
Large folios occupy N consecutive entries in the swap cache instead of
using multi-index entries like the page cache. However, if a large folio
is re-added to the LRU list, it can be migrated. The migration code was
not aware of the difference between the swap cache and
We have a check in do_swap_page that page from lookup_swap_cache should
have private field equal to the swapcache index we searched it at
(page_private(page) != entry.val). So folio_migrate_mapping should
preserve page private for each page of a huge folio to satisfy this
check else we get infinite
