diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index da6f85b7db88..b839080a2a6b 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1862,7 +1862,46 @@ static void update_and_free_hugetlb_folio(struct hstate *h, struct folio *folio, static void update_and_free_pages_bulk(struct hstate *h, struct list_head *list) { struct folio *folio, *t_folio; + bool clear_dtor = false; + /* + * First allocate required vmemmmap (if necessary) for all folios on + * list. If vmemmap can not be allocated, we can not free folio to + * lower level allocator, so add back as hugetlb surplus page. + * add_hugetlb_folio() removes the page from THIS list. + * Use clear_dtor to note if vmemmap was successfully allocated for + * ANY page on the list. + */ + list_for_each_entry_safe(folio, t_folio, list, lru) { + if (folio_test_hugetlb_vmemmap_optimized(folio)) { + if (hugetlb_vmemmap_restore(h, &folio->page)) { + spin_lock_irq(&hugetlb_lock); + add_hugetlb_folio(h, folio, true); + spin_unlock_irq(&hugetlb_lock); + } else + clear_dtor = true; + } + } + + /* + * If vmemmmap allocation was performed on any folio above, take lock + * to clear destructor of all folios on list. This avoids the need to + * lock/unlock for each individual folio. + * The assumption is vmemmap allocation was performed on all or none + * of the folios on the list. This is true expect in VERY rare cases. + */ + if (clear_dtor) { + spin_lock_irq(&hugetlb_lock); + list_for_each_entry(folio, list, lru) + __clear_hugetlb_destructor(h, folio); + spin_unlock_irq(&hugetlb_lock); + } + + /* + * Free folios back to low level allocators. vmemmap and destructors + * were taken care of above, so update_and_free_hugetlb_folio will + * not need to take hugetlb lock. + */ list_for_each_entry_safe(folio, t_folio, list, lru) { update_and_free_hugetlb_folio(h, folio, false); cond_resched(); |