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b=k3hWMC6IUNtYuzOPzmJ7y1M5aFJuabov6fIU9bZ0sHW+WrXQhJQFQybdudnHe7uBU 1DheJOg0y7ORTXvx77EkEpgphs6LsSg66jTwGk+v4p4Il8mUmIfRg7h4RIwsGdhDNj giZetxpv1pMCMoxqM++pU4Fka2UKLcin4pQQCZECGzEKtd1t8cQZoBnzqgHeFmFZod ozIEGX/tYSllaAWg78LdWR7Of0JKD+T0ijfiMdKsMgZPb0rw+iKSrYuLhAvGm8oHUK D33cywp6G4E7nt22lpQHhxzxlnX82ly0Fx06nJ0bUvBq8q8ac/FWRf1p60+E1EcP7n IT1xmbxcMe9QQ== Message-ID: Date: Tue, 29 Sep 2026 09:11:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 03/12] mm/sparse-vmemmap: introduce CONFIG_VMEMMAP_OPTIMIZATION To: Muchun Song , Andrew Morton , Oscar Salvador , Madhavan Srinivasan , Michael Ellerman , Jonathan Corbet Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org, Muchun Song , Lorenzo Stoakes , Mike Rapoport , Qi Zheng , Nicholas Piggin , Christophe Leroy , Randy Dunlap , Lance Yang References: <20260927025441.741633-1-songmuchun@bytedance.com> <20260927025441.741633-4-songmuchun@bytedance.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 528D54000A X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: zqukekuyaymr3xim1eogjfmirqt4bipy X-HE-Tag: 1790665880-676044 X-HE-Meta: U2FsdGVkX18JMQtJghvNnZoAu+yizxo83g8ysztkBINeq1oVrMYGvW6y6nJ+sH2hrL3WcclFAn5LQzA7dahZX08lC/RISNjv8qFGeVBCTxPQRcEmbzj+HCRPYhsf6L0G3BMQ8RV5ptgDIFi9qq6/paaptCk+2Aod4tKbxNdqPuD+SoB5EyBINOZl0tVF/ZN2n53lzVJywS6/5XVYt05hE8qWREhmOrae247myn2XTB3PKFm2Ot24hc0YyyHJMNonG1oOfuu7xawOylf2kfTtSSQJky5E7XOBKpQzM8Q1B4ItYU5VENQSvA9Cnp26hDvIqH5HZk/6Ilb4b4vCwuI/wPJidGVTk6ip4tch5znrddgA8iQD+VrZx8lf78ydTlzZpzxMfkY+setr1kN4P6o5tMl4XDoZHOYBnqo2RbhbfDpVdqc9CwFCDxmGunFG1zGagT6+O+bVMeNHi4gyy/BZDCYCpOLJs4DfRyXuas9XISkVrZo9cfkaLh7LnWhPlWQ8TBaNwhcezhLUjgWYMRd85eUShQO2eWJ0GhPxG7/3Al1uSsD673B+U/X6SxaIAvBi0Quron35h9lykcdmqlINuQnBeWDajMAvRNPOw5hVhcMYkhqjAInXPrS4V7s9jFEuSFExIzMk0+qZsJ+vaz5dRL5fq3aMPfGihPaYtDV55s1ZVW05ORejWILNK+VQbRqOepZv2DziK9zRqE/ToaLdFOffb1BbXuziTzmAPeV0ZvXdUw3lHNEiXnmelyzZaqptImDs2RYoGvfN8veHMuDisvU2x53666vGSIT7sbazQq5cXm5oiZMz0O8s0+V70hiOeWyUtyDVIFNi3+wVNved2N39E3W9Wmxsp5LCJeKkzdgoBigVZzXbm8pVHCZmG+T3TTcZv1cdKkicIz/ZrdAt36XPGnw4mPcQHq6T9K7AWAL1crMxiNXmaRBzUg9ZKB8NWNBS7H2PcWxqs/bdCIP bpz3VhlQ los2BArhr54KqzU6UbWWNAWXFRaj9uk0syPMwvWVnCop1oGLPn4SALU26wX0rM9aR14hW47kooQBzyUQAfEPf0nVes6KXOyNJoiGUkwfX9JKz8K6mY0gyqrU1DI1ZwLDBIj+Vc1zTpN+CG/zUuwhK4POrOxUV1vuZcxRNK4FsaWjdEXl0/bmAyyMaHGNNI1D2by1l8y2DoES39UbuJXB1SC2LbsrszV5Hr03tJWHJngjWxsRJVbZ3TjepwDWINHawDKY0jXMNe4jS2kLQotYgx07BLAlZxGBb/sF4e7VnOg/xzJX35H9YHf19x63g6uCQg5Hr60ekWnLleunALJ3q74mMTtcw9r50VEo+ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/27/26 04:54, Muchun Song wrote: > The section-based vmemmap optimization infrastructure is guarded by > CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP, but it can also be used by > ZONE_DEVICE users that set dev_pagemap::vmemmap_shift. Introduce > CONFIG_VMEMMAP_OPTIMIZATION as a common config for the shared > infrastructure. > > Select the new option from HUGETLB_PAGE_OPTIMIZE_VMEMMAP and from > ZONE_DEVICE when the architecture opts in to DAX vmemmap optimization, > and use it to guard the generic sparse-vmemmap state and helpers. > > Signed-off-by: Muchun Song > Acked-by: Qi Zheng > Acked-by: Mike Rapoport (Microsoft) > --- > v5: > - Move this patch after the shared tail-page factoring. > - Select VMEMMAP_OPTIMIZATION from ZONE_DEVICE instead of DEV_DAX, > covering all users of dev_pagemap::vmemmap_shift, reported by > Sashiko. > > v4: > - Rename SPARSEMEM_VMEMMAP_OPTIMIZATION to VMEMMAP_OPTIMIZATION > (suggested by Mike Rapoport) > - Collect Acked-by from Mike Rapoport > > v2: > - Fix SPARSEMEM_VMEMMAP_OPTIMIZATION being selected without SPARSEMEM_VMEMMAP > reported by Sashiko. > - Add an explicit DEV_DAX dependency on ZONE_DEVICE > - Collect Acked-by from Qi Zheng > --- > arch/x86/entry/vdso/vdso32/fake_32bit_build.h | 2 +- > fs/Kconfig | 1 + > include/linux/mm.h | 3 +++ > include/linux/mmzone.h | 10 +++++----- > include/linux/page-flags.h | 5 ++--- > mm/Kconfig | 5 +++++ > mm/sparse-vmemmap.c | 2 +- > mm/sparse.h | 6 +++--- > 8 files changed, 21 insertions(+), 13 deletions(-) > > diff --git a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h > index bc3e549795c3..72a92cb9b53d 100644 > --- a/arch/x86/entry/vdso/vdso32/fake_32bit_build.h > +++ b/arch/x86/entry/vdso/vdso32/fake_32bit_build.h > @@ -11,7 +11,7 @@ > #undef CONFIG_PGTABLE_LEVELS > #undef CONFIG_ILLEGAL_POINTER_VALUE > #undef CONFIG_SPARSEMEM_VMEMMAP > -#undef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP > +#undef CONFIG_VMEMMAP_OPTIMIZATION > #undef CONFIG_NR_CPUS > #undef CONFIG_PARAVIRT_XXL > > diff --git a/fs/Kconfig b/fs/Kconfig > index d1c210c6508f..1454b7fe9641 100644 > --- a/fs/Kconfig > +++ b/fs/Kconfig > @@ -278,6 +278,7 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP > def_bool HUGETLB_PAGE > depends on ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP > depends on SPARSEMEM_VMEMMAP > + select VMEMMAP_OPTIMIZATION Acked-by: David Hildenbrand (Arm) Is there a path to remove HUGETLB_PAGE_OPTIMIZE_VMEMMAP, and to merge ARCH_WANT_OPTIMIZE_DAX_VMEMMAP+ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP into a ARCH_SUPPORTS_VMEMMAP_OPTIMIZATION? -- Cheers, David