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Wong" , David Bueso Cc: Jan Kara , Kefeng Wang , Tso Ted , Ritesh Harjani , Johannes Weiner , Oliver Sang , Matthew Wilcox , David Hildenbrand , Alistair Popple , linux-mm@kvack.org, Christian Brauner , Hannes Reinecke , oe-lkp@lists.linux.dev, lkp@intel.com, John Garry , linux-block@vger.kernel.org, ltp@lists.linux.it, Pankaj Raghav , Daniel Gomez , Dave Chinner , gost.dev@samsung.com, linux-fsdevel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam01 X-Stat-Signature: ppbwp9x7gj37em1uhezrfnfhyikyjdk8 X-Rspam-User: X-Rspamd-Queue-Id: D62F5120009 X-HE-Tag: 1744133096-771509 X-HE-Meta: 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 AkI6xz/w o5K5wqlAtaUfCo+R257NJmywTJR10o8X6Z7ioWpcou1HXvYfsVtu++YBRC+aqcsbxq2rS97f459TVIe8yDipSDvzwfih6jGYUtF9GgVLnei5bu7fklLh7c53qpFVzwBqw8shG6X/tqFEYzKK/vCgpf+MxJLNpEXdUYukXpjWi+WZhG4ik0z3/Rhos6zALPgCEE0Cr+E+UudXNVoeavflGSwCSmQ9nDNoJrcxXV5I7mJYEfihrHfLERouGSmdyznxvEJpjtFIPUMPcayzHexr/jkLVFgX22zQUXsS7c0mviw9KZ626gfJxnEojZ96TGfoJfubI22HcjZ1M2HDM3LVSmuRK1Q5etQhcMyr/QEy129lNAjtR4OR+Y9+W/JCJ9zhCQskVbK5o+Argfkjpcm+YKubbPKAVgquE59DZVIh4+DZlbao= 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: On Tue, Apr 8, 2025 at 10:06=E2=80=AFAM Luis Chamberlain wrote: > Fun > puzzle for the community is figuring out *why* oh why did a large folio > end up being used on buffer-heads for your use case *without* an LBS > device (logical block size) being present, as I assume you didn't have > one, ie say a nvme or virtio block device with logical block size > > PAGE_SIZE. The area in question would trigger on folio migration *only* > if you are migrating large buffer-head folios. We only create those To be clear, large folios for buffer-heads. > if > you have an LBS device and are leveraging the block device cache or a > filesystem with buffer-heads with LBS (they don't exist yet other than > the block device cache). Luis