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Shutemov\"" , 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) && > > I think you also need to check that the order > 1, now that we support order-1 > pagecache folios? _deferred_list only exists if order > 1. > >>> + !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. >> >> 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. > > I've seen data_race() used around list_empty() without the lock held > inconsistently (see deferred_split_folio()). What are the rules? Given that we > are not doing a memory access here, I don't really understand why it is needed? > list_empty() uses READ_ONCE() which I thought would be sufficient? (I've just > added a similar lockless check in my swap-out series - will add data_race() if > needed, but previously concluded it's not). > >> >> 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. >> >> 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. > > This comment makes me wonder what we do in split_huge_page_to_list_to_order() if > the target order is greater than 1 and the input folio is on the deferred split > list. Looks like we currently just remove it from the deferred list. Is there a > case for putting any output folios that are still partially mapped back on the > deferred list, or splitting them to a lower order such that all output folios > are fully mapped, and all unmapped portions are freed? I probably would let the caller of split_huge_page_to_list_to_order() to decide whether output folios should be put back in deferred list. The caller should determine the right order to split. Letting split_huge_page_to_list_to_order() change new_order will confuse the caller and complicate the handling of output folios. -- Best Regards, Yan, Zi --=_MailMate_A38E795F-10D3-4815-B38D-7CA08003ABBF_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXwZh0PHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUg3EQAIaNBPi4Mi7uXck8YkY+emCL2MNP8lsfMjRd C7Qq3v8xffXlvOKuTMeB28805xE0qvQX1dbuZlcwGPz56OndG7Adhuo8EEjcbawZ oLYUNTMrfoFARSQrcxablilUkzpLw8kz8Ir9rdIZDR7L5GzV31zfq8AoiIL1PVor ru7IcpEdHfXy+mOg5e8otXfjqI675wHf4TXu+W1zod+JYWXxsaemhCxfyjjapui5 /nz78aOdJkL+LiE8lFv7GCMgvHkHDi19+1KiBcVSoTbNRi7eHmpdCu4yuW7xJzkH KA1dBRvjrEAU8+1JSyo9NKxWv09RklPt14GsueU5WXYb6WkLjDuSt+uV1xTw5b1o SxhbSbca4A0UC0dzUg9u04gnzw6RzH0rz4IQ8SHYouqcHY691AdsIx1LUmvTINs5 nBeFnaYN/JdtRogkRyv2WqAsRbQGJbk4rbjl5zJYw9yQ1WDjeR2ghbMcrBBiw3Hg 8vgZszEe68t7EJg8PGRjtxOWzx5UEYK++cP27T3F6P11ESlrihwkBOeWJ3Zl3vnP dI5b5bnn8B+Uoam1Iry2JXVHWZkPrhv6twlrnbIF59AF8ldrO8bwJPUVm+3vroVA 6ETXqHmXLq7EWcXBnGmXTNwQ8zctm3leY1/UNa3JM0ceOslnLtjLFBlnOiSkZ+vF nKknmwTL =vpEP -----END PGP SIGNATURE----- --=_MailMate_A38E795F-10D3-4815-B38D-7CA08003ABBF_=--