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Pankaj Raghav (Samsung) wr= ote: >>>>> From: Pankaj Raghav >>>>> >>>>> As we don't have a way to split a folio to a any given lower folio >>>>> order yet, avoid splitting the folio in split_huge_page_to_list() i= f it >>>>> has a minimum folio order requirement. >>>> >>>> FYI, Zi Yan's patch to do that is now in Andrew's tree. >>>> c010d47f107f609b9f4d6a103b6dfc53889049e9 in current linux-next (date= d >>>> Feb 26) >>> >>> Yes, I started playing with the patches but I am getting a race condi= tion >>> resulting in a null-ptr-deref for which I don't have a good answer fo= r >>> yet. >>> >>> @zi yan Did you encounter any issue like this when you were testing? >>> >>> I did the following change (just a prototype) instead of this patch: >>> >>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>> index 9859aa4f7553..63ee7b6ed03d 100644 >>> --- a/mm/huge_memory.c >>> +++ b/mm/huge_memory.c >>> @@ -3041,6 +3041,10 @@ int split_huge_page_to_list_to_order(struct pa= ge *page, struct list_head *list, >>> { >>> struct folio *folio =3D page_folio(page); >>> struct deferred_split *ds_queue =3D get_deferred_split_queue(= folio); >>> + unsigned int mapping_min_order =3D mapping_min_folio_order(fo= lio->mapping); >> >> I am not sure if this is right. Since folio can be anonymous and folio= ->mapping >> does not point to struct address_space. >> >>> + >>> + if (!folio_test_anon(folio)) > > Hmm, but I update the new_order only if it is not anonymous. Do you thi= nk it is still > wrong? For anonymous folio, folio->mapping has last bit set and point to a possi= ble struct anon_vma. I do not know what ->flag will be or if it is access= ible in that case. See: https://elixir.bootlin.com/linux/latest/source/include/linux/page-fl= ags.h#L608 -- Best Regards, Yan, Zi --=_MailMate_F26EA42E-76E9-4ABA-944B-D33F85A7FB4C_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmYC+g4PHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUjW4P/1bIufbo8IwzNsp+7LAjRPiog7nMvmIjLT0G VFsf9ZwhL1Jh/exR3duGwsTb3W4mJiuiIkC+GlZB1Vx9bzW9IPBb+jpEFk/VBm5w 0hTAC8/8fcnXgQSRbJwb7wOEZP84on2dQFudh9b/wIJAFboXc8Y6X0Atr9crFbWp ZeRHrt+jXhkmZkdzIBwIFg2YA1j1kY+MsmlAFY+N8C6Svs1rNkCcx7UlZAjM8sMA TcUDR2v9D9f3ozeWx/uiaQd7oek+i29WqypCCIWGYB8TvnpKxixGbgarU0aa/8sn /VKIfydyWkwM1f6z05FqvvwlQsg1iVTXVbcGOBbtfl1OhFnXQQ+coJaSKPjwdQWI 9N4QTmwPd163MOingNG2C7yXI30NRGhM/UW/ABRUjZayjcezqzixr4KJbLAn/xVD BYp5T4YtZUoNlUkX7kXADIq0/YJ+DhGaW2O0tutjWdRGQ22jGYjpATdBQUqfST0J /gAL5uAusx9znytbAErLDxzHAlTbuXJs4X46SxhB50J98vG9MIc+SsR3IQhbzsJl QbdBlyZQy6URae/kePbTn4zuX4YykPvM+l9pfBIMNPmDrJZGR+oOMHQVRIqtJsy8 AQAQ8keL0dlzDBd9Oz6ystSA2EzT3pHBg38GhXwwsm5aL+S0lD8TPlooBVkHuSma z+XOW/lW =CSUv -----END PGP SIGNATURE----- --=_MailMate_F26EA42E-76E9-4ABA-944B-D33F85A7FB4C_=--