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 HGo3JY3b zhQA93piG0c7nKF2hZUn/jdF8HLMszpn/RRfNzBhHJ+QKM2J/DnHKGL6YXaZsO3n3oX3kWKoydrwwruaTuMqdmfSLdUzjnpQp0Y6n/V3AtG0yQMRqTfiTLb8fhUM7iPAsd5Ra7nTf4uE3dNJ3gAY+Kniava5QovYZzChrOC19kYT60Rg430UGnh0klDhDzO1HJhDpIs21BvB4g3uu3QFBWNBNgPZyIGlF9BdeDihO70wQvgKYHz+lRa9lKwVhEQwtOUIl/ZZZFxVHtvCWR2cVxeEQeek3enmhyUM4VF4+y6Nf6TxYDCsxY7Zq9BGoLBlO2zAOfisB+0eEPsDMIvmabCFpoIhZgvYf4IzEwkb5rtMeRiS8TJJf78Cyjg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 15 Apr 2026, at 21:05, Baolin Wang wrote: > On 4/15/26 10:36 PM, David Hildenbrand (Arm) wrote: >> On 4/15/26 12:05, Baolin Wang wrote: >>> >>> >>> On 4/15/26 5:54 PM, David Hildenbrand (Arm) wrote: >>>>> >>>>> Yes, that makes sense. >>>>> >>>>> However, it=E2=80=99s also possible that the mapping does not support= large >>>>> folios, yet anonymous shmem can still allocate large folios via the >>>>> sysfs interfaces. That doesn't make sense, right? >>>> >>>> That's what I am saying: if there could be large folios in there, then >>>> let's tell the world. >>>> >>>> Getting in a scenario where the mapping claims to not support large >>>> folios, but then we have large folios in there is inconsistent, not? >>>> >>>> [...] >>>> >>>>> >>>>> For the current anonymous shmem (tmpfs is already clear, no questions= ), >>>>> I don=E2=80=99t think there will be any "will never have/does never a= llow" >>>>> cases, because it can be changed dynamically via the sysfs interfaces= . >>>> >>>> Right. It's about non-anon shmem with huge=3Doff. >>>> >>>>> >>>>> If we still want that logic, then for anonymous shmem we can treat it= as >>>>> always "might have large folios". >>> >>> OK. To resolve the confusion about 1, the logic should be changed as >>> follows. Does that make sense to you? >>> >>> if (sbinfo->huge || (sb->s_flags & SB_KERNMOUNT)) >>> =C2=A0=C2=A0=C2=A0=C2=A0mapping_set_large_folios(inode->i_mapping); >> >> I think that's better. > > Thanks for your valuable input. > > But has Willy says, maybe we can just >> unconditionally set it and have it even simpler. > > However, for tmpfs mounts, we should still respect the 'huge=3D' mount op= tion. See commit 5a90c155defa ("tmpfs: don't enable large folios if not sup= ported"). Is it possible to get sbinfo->huge during tmpfs=E2=80=99s folio allocation = time, so that even if all tmpfs has mapping_set_large_folios() but sbinfo->huge can still decide whether huge page will be allocated for a tmpfs? Best Regards, Yan, Zi