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 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: List-Subscribe: List-Unsubscribe: --a4e0b808739889c0ad3421c8338e2d1b4189d9e85860bf7aefa565ddb90d Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Mon Jul 8, 2024 at 5:55 PM EDT, Peter Xu wrote: > This issue is not from any report yet, but by code observation only. > > This is yet another fix besides Hugh's patch [1] but on relevant code pat= h, > where eager split of folio can happen if the folio is already on deferred > list during a folio migration. > > Here the issue is NUMA path (migrate_misplaced_folio()) may start to > encounter such folio split now even with MR_NUMA_MISPLACED hint applied. > Then when migrate_pages() didn't migrate all the folios, it's possible th= e > split small folios be put onto the list instead of the original folio. > Then putting back only the head page won't be enough. > > Fix it by putting back all the folios on the list. > > [1] https://lore.kernel.org/all/46c948b4-4dd8-6e03-4c7b-ce4e81cfa536@goog= le.com/ > > Cc: Zi Yan > Cc: Yang Shi > Cc: Hugh Dickins > Cc: Baolin Wang > Cc: Huang Ying > Cc: David Hildenbrand > Fixes: 7262f208ca68 ("mm/migrate: split source folio if it is on deferred= split list") > Signed-off-by: Peter Xu > --- > > Don't need to copy stable if this can still hit 6.10.. Only smoke tested= . > --- > mm/migrate.c | 10 ++-------- > 1 file changed, 2 insertions(+), 8 deletions(-) LGTM. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi --a4e0b808739889c0ad3421c8338e2d1b4189d9e85860bf7aefa565ddb90d Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAABCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmaMYPcPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUakMQAJ1+5cYgJ2loUEvqzHNLQ8iSh/wGsaR+oQa8 myYIkFSwOmc5vSSfShqa2ka/4HpcQzgzeaoxEsEFqycUS+5vOCZBGuG9YWZ+uIMz 2G1KSCkv5XEWILBPZ6cGYAQRaA617R0rOfjCoZwI7PyEpDKj+D2qPNtpGgBidUlf Fcm8/wKFZ2EjBStAcid+iNaRdusx1KRV3zfiR4dRMFG8BOPRH8Z02hTVyA5rd+1X P+bGsAAc7D1g5KsIvv0RPJjdsN0yiVGVpZmvMT3HyoB4WS1NDvAM3vtcKy0QVSWB uVGXq2gGgZfRmSlv90aB/3LslLfrEJtcJOtedC3pCEjtO20xJzoE4JFsp9uPh+t8 ooxxLSiuujIGrsIHgyjXFWQ9a3CLc8EOIwpCBtJM/8ulO24Zyz/iPgSCJ/4QlBgm gvIDM0p5cnlRjHY33BBFQ88bbrvednTPoOIPOw4ibSIsv3iwiUidNf/KaueOsJLI nJFPZLuLBrY9WWglbUXUDFrJfaoYvM39mD6NNNwAL/PHu02a4dyjLYaz3Z3RHnth 72TJSI2TjQ2W4+1KD/rGMwZL+GU+a4/A1yetBqg+oNVibtCa91ygOGKJWvOVD7Nu GtGSVQq+2RQVfAWkSkilD2hqcL5VpjFmpk51DFWNMlud/Azh6WDAFwhd/53bqve6 +9VeAXqj =/wtm -----END PGP SIGNATURE----- --a4e0b808739889c0ad3421c8338e2d1b4189d9e85860bf7aefa565ddb90d--