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Tue, 29 Sep 2026 07:11:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790665879; bh=JdlkVNS4LHpC8Yj8xus5KzRNAlfmfW9Jat5ACbHfNXQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To; 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 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list 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 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