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 TrJeCiGP Di3INx3Dtz70EMdB/tRmKbDupzwrpE5388z7Embf+0vDa7XAnv+t7xt8f7anZbFbH5ukyajl0dHLRg2HVE1NplZmI4zd+utNdCZvhtkwztLUDUSk7P66JdNXODq8mkw+QAIoxtgmNVQxeufWO6r4nk90FSxRSwKOcrKjD+2z7fAjtesy5+fBZL86vS3qeMEtXN2WJV81aUP3rC28Iv9OKOs4UXqlt+suOQiZa23UAo8O2QBYbagSAbALf2YIGAhOVAqKcLZxword2Aq1/uwccoPnC3nytCV2o0CXphavwjfXxW8C5Wj7+pjwGTTTjqg/ebM+yonizXuk2HbCT4B/3sXyiOtIXJBIfdiDwrTZBJxHhzSR2SpvCuYl66H3oFYBwZzx8r0vWqz9BYTbUlOeIElX/lSBmyqNrHIQwZAmJcJd/DB071PBJP6wD5oIMYiQseSkf8hBoulsLbQJoq91YJcCaq9Tn0Myr5KUcYbLzPcqSLTD6iqh8YkNvuIdXh5QSPkLwgIv+fx81JW0XXIGjXCgQoj0XjK/l0kPa 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 8/21/23 11:33 AM, Mike Kravetz wrote: > 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); Hi Mike, Thanks for catching this. Changing this line to: + expected_count = folio_expected_refs(mapping, src); seems to fix migration from my testing. My test was inserting a sleep() in the hugepage-mmap.c selftest and running the migratepages command. With this version of the patch: migrate_pages(44906, 65, [0x0000000000000001], [0x0000000000000002]) = 75 which means 75 pages did not migrate and after the change to folio_expected_refs(): migrate_pages(7344, 65, [0x0000000000000001], [0x0000000000000002]) = 0 Does that change look correct to you? Thanks, Sid Kumar > 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.