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Shutemov\"" , Ryan Roberts , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] mm/migrate: put dest folio on deferred split list if source was there. 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>> } >> locked = true; >> + if (folio_test_large_rmappable(src) && >> + !list_empty(&src->_deferred_list)) { >> + struct deferred_split *ds_queue = get_deferred_split_queue(src); >> + >> + spin_lock(&ds_queue->split_queue_lock); >> + ds_queue->split_queue_len--; >> + list_del_init(&src->_deferred_list); >> + spin_unlock(&ds_queue->split_queue_lock); >> + old_page_state |= PAGE_WAS_ON_DEFERRED_LIST; >> + } > > I have a few problems with this ... > > Trivial: your whitespace is utterly broken. You can't use a single tab > for both indicating control flow change and for line-too-long. Got it. Will not do this any more. > > Slightly more important: You're checking list_empty outside the lock > (which is fine in order to avoid unnecessarily acquiring the lock), > but you need to re-check it inside the lock in case of a race. And you > didn't mark it as data_race(), so KMSAN will whinge. Got it and will check data_race() related changes. Will fix. > > Much more important: You're doing this with a positive refcount, which > breaks the (undocumented) logic in deferred_split_scan() that a folio > with a positive refcount will not be removed from the list. What is the issue here? I thought as long as the split_queue_lock is held, it should be OK to manipulate the list. > > Maximally important: Wer shouldn't be doing any of this! This folio is > on the deferred split list. We shouldn't be migrating it as a single > entity; we should be splitting it now that we're in a context where we > can do the right thing and split it. Documentation/mm/transhuge.rst > is clear that we don't split it straight away due to locking context. > Splitting it on migration is clearly the right thing to do. > > If splitting fails, we should just fail the migration; splitting fails > due to excess references, and if the source folio has excess references, > then migration would fail too. You are suggesting: 1. checking if the folio is on deferred split list or not 2. if yes, split the folio 3. if split fails, fail the migration as well. It sounds reasonable to me. The split folios should be migrated since the before-split folio wants to be migrated. This split is not because no new page cannot be allocated, thus the split folios should go into ret_folios list instead of split_folios list. Thank you for the comments. -- Best Regards, Yan, Zi --=_MailMate_ACE1246F-14C0-436D-8621-9A3AC4016D27_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXwYv0PHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUKroP/2tzxVy73eTVTV6UNYmhwuKuKIVaBTd8O9GR IGHlh/V9FoehZ6EUZYs/W6CXCFASkW1TfDmjHawH49nXjU50cW9n28FvkFIE76KJ auP9SHEe7hhwgb405uMM85961LLeYLpsBE2mlFM39OT5FAnqqnsgOJwGBo2i2WOq QMRz4t1sihKSJ0h92m6t7BIG9AgfQeJXLCOAUkd7i342DILhTgSwbDNhZQZWPVUd sOiHPgCk5AKfYc+LLRDrATazuNU+Xzg4aCTZOzr85AYBrOgjy6f9o6D+c4y1kGbl 3JscNynKME6lRgTEaEloqJvOxoGai3hLUTe8k9tuax9PF5LAha5ufhyZWjYcqf8J pndT2iP6rqRmmaYqTp2vq/xHCoF8VtxwTFRjl5bOordbZZPqb6fhZipNDNb2HnT3 iWVbL4MgbRnFTS2gg0uBX3QTbwb3zTF+o6DKvo0Cjh+9AYwOyparNIXewYLvGWxK m8YKqFgya3hh6Dxi9K0Rt/Hs3UKbHtM4PVKdM3ur50YYCUBY6P88dSkMUbCWzv0F vHklxexkbFHS2hOPzi+bf+Xn2ft5MXZ8eytR5+SJP/7s6uWYa7SjVz2oDQikE5FF L5OdIJd6SazESyDRDSMKxpYKn9UZVrGSvaRGdkAASiAW+NIATMH4Khyatc6bpiWP GSR9LS9T =VQMN -----END PGP SIGNATURE----- --=_MailMate_ACE1246F-14C0-436D-8621-9A3AC4016D27_=--