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Thu, 28 Aug 2025 00:18:50 -0700 (PDT) Date: Thu, 28 Aug 2025 07:18:50 +0000 From: Wei Yang To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Zi Yan , "Mike Rapoport (Microsoft)" , SeongJae Park , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "David S. Miller" , Andreas Larsson , Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org Subject: Re: [PATCH v1 01/36] mm: stop making SPARSEMEM_VMEMMAP user-selectable Message-ID: <20250828071850.kl7clyh6e75horlk@master> Reply-To: Wei Yang References: <20250827220141.262669-1-david@redhat.com> <20250827220141.262669-2-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250827220141.262669-2-david@redhat.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Rspamd-Queue-Id: 64D861C000E X-Stat-Signature: jm98jx84f9dwfpcbtt6b8drs555tkprh X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1756365533-848421 X-HE-Meta: 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 zV0yLVwj 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 rse23TAq EGBdZXV0bq5AzaBZ7DuUGBDpzjjUxO96mgcDIbJ/oNvo0CfhdUwJVsHc6K+3Go9MBe5kERpM/vk7j2KzrDsUPH8eEMXnvTGpyjI+hTlPZ7pBSJTPL5i2Og== 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 Thu, Aug 28, 2025 at 12:01:05AM +0200, David Hildenbrand wrote: >In an ideal world, we wouldn't have to deal with SPARSEMEM without >SPARSEMEM_VMEMMAP, but in particular for 32bit SPARSEMEM_VMEMMAP is >considered too costly and consequently not supported. > >However, if an architecture does support SPARSEMEM with >SPARSEMEM_VMEMMAP, let's forbid the user to disable VMEMMAP: just >like we already do for arm64, s390 and x86. > >So if SPARSEMEM_VMEMMAP is supported, don't allow to use SPARSEMEM without >SPARSEMEM_VMEMMAP. > >This implies that the option to not use SPARSEMEM_VMEMMAP will now be >gone for loongarch, powerpc, riscv and sparc. All architectures only >enable SPARSEMEM_VMEMMAP with 64bit support, so there should not really >be a big downside to using the VMEMMAP (quite the contrary). > >This is a preparation for not supporting > >(1) folio sizes that exceed a single memory section >(2) CMA allocations of non-contiguous page ranges > >in SPARSEMEM without SPARSEMEM_VMEMMAP configs, whereby we >want to limit possible impact as much as possible (e.g., gigantic hugetlb >page allocations suddenly fails). > >Acked-by: Zi Yan >Acked-by: Mike Rapoport (Microsoft) >Acked-by: SeongJae Park >Cc: Huacai Chen >Cc: WANG Xuerui >Cc: Madhavan Srinivasan >Cc: Michael Ellerman >Cc: Nicholas Piggin >Cc: Christophe Leroy >Cc: Paul Walmsley >Cc: Palmer Dabbelt >Cc: Albert Ou >Cc: Alexandre Ghiti >Cc: "David S. Miller" >Cc: Andreas Larsson >Signed-off-by: David Hildenbrand Reviewed-by: Wei Yang >--- > mm/Kconfig | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > >diff --git a/mm/Kconfig b/mm/Kconfig >index 4108bcd967848..330d0e698ef96 100644 >--- a/mm/Kconfig >+++ b/mm/Kconfig >@@ -439,9 +439,8 @@ config SPARSEMEM_VMEMMAP_ENABLE > bool > > config SPARSEMEM_VMEMMAP >- bool "Sparse Memory virtual memmap" >+ def_bool y > depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE >- default y > help > SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise > pfn_to_page and page_to_pfn operations. This is the most >-- >2.50.1 > -- Wei Yang Help you, Help me