diff options
| -rw-r--r-- | mm/migrate.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index ab9856f5931b..63c97bb639d7 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1653,6 +1653,29 @@ static int migrate_pages_batch(struct list_head *from, cond_resched(); /* + * The rare folio on the deferred split list should + * be split now. It should not count as a failure. + * Only check it without removing it from the list. + * Since the folio can be on deferred_split_scan() + * local list and removing it can cause the local list + * corruption. Folio split process below can handle it + * with the help of folio_ref_freeze(). + * + * nr_pages > 2 is needed to avoid checking order-1 + * page cache folios. They exist, in contrast to + * non-existent order-1 anonymous folios, and do not + * use _deferred_list. + */ + if (nr_pages > 2 && + !list_empty(&folio->_deferred_list)) { + if (try_split_folio(folio, split_folios) == 0) { + stats->nr_thp_split += is_thp; + stats->nr_split++; + continue; + } + } + + /* * Large folio migration might be unsupported or * the allocation might be failed so we should retry * on the same folio with the large folio split |