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XGwDPMWnNqMzIfDsC5ETh4E5ac2WoP95Yk/oB4Qvfyca2DSsKbZmexGRwrnDBPte2C1M0pwB7JB+qvXRDDqLa6QZIoRVa5NDGY+/sAYI3hN7v4VZl8Cto0ovmOUBZeR6LOpxM242K7fODnQwEnZNjlVbJl5xrfjPbqa1MjEvwyvMQI9kF2cLlU7YuFXZEkE2JD69Zzvad9WcZNa3+nTv9qAj+htp872in0XegZuTpOvfwCoR9Ef51p17Rv0mDcEvCfxPMv+ExiiSEwyxlhfwWxkdJfc7l7TTNPDEouDyB4U1/ZpXQJbuYDnvn3PHbYMUcz5fzvYsc2LVQcve1Qlk84g34jM3v4ifH6hxblxu5F3/OOISOKXODrLx1QeKCNMW+KxXYip2YNsIJXnXTLCkORlXpWAZJrO19TaJDngelGwgT6aIq3bNHj+S+eIz+cXc9CKgy X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 08/17/23 11:18, Sidhartha Kumar wrote: > Remove special cased hugetlb handling code within the page cache by > changing the granularity of each index to the base page size rather than > the huge page size. Adds new wrappers for hugetlb code to to interact with the > page cache which convert to a linear index. > @@ -237,7 +234,7 @@ void filemap_free_folio(struct address_space *mapping, struct folio *folio) > if (free_folio) > free_folio(folio); > > - if (folio_test_large(folio) && !folio_test_hugetlb(folio)) > + if (folio_test_large(folio)) > refs = folio_nr_pages(folio); > folio_put_refs(folio, refs); > } > @@ -858,14 +855,15 @@ noinline int __filemap_add_folio(struct address_space *mapping, > > if (!huge) { > int error = mem_cgroup_charge(folio, NULL, gfp); > - VM_BUG_ON_FOLIO(index & (folio_nr_pages(folio) - 1), folio); > if (error) > return error; > charged = true; > - xas_set_order(&xas, index, folio_order(folio)); > - nr = folio_nr_pages(folio); > } When a hugetlb page is added to the page cache, the ref count will now be increased by folio_nr_pages. So, the ref count for a 2MB hugetlb page on x86 will be increased by 512. We will need a corresponding change to migrate_huge_page_move_mapping(). For migration, the ref count is checked as follows: xas_lock_irq(&xas); expected_count = 2 + folio_has_private(src); if (!folio_ref_freeze(src, expected_count)) { xas_unlock_irq(&xas); return -EAGAIN; } So, this patch will break hugetlb migration of hugetlb pages in the page cache. Sorry for not noticing this earlier. -- Mike Kravetz