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From: Muchun Song In-Reply-To: Date: Thu, 14 May 2026 10:37:28 +0800 Cc: Andrew Morton , Muchun Song , David Hildenbrand , Michael Ellerman , Madhavan Srinivasan , Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , Ackerley Tng , Frank van der Linden , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <20260513130542.35604-1-songmuchun@bytedance.com> <20260513104640.b0f02b844c57f92bc954878e@linux-foundation.org> To: Oscar Salvador X-Migadu-Flow: FLOW_OUT > On May 14, 2026, at 02:26, Oscar Salvador wrote: >=20 > On Wed, May 13, 2026 at 10:46:40AM -0700, Andrew Morton wrote: >> On Wed, 13 May 2026 21:04:28 +0800 Muchun Song = wrote: >>=20 >>> In this series, HVO is redefined as Hugepage Vmemmap Optimization: a >>> general vmemmap optimization model for large hugepage-backed = mappings, >>> rather than a HugeTLB-only implementation detail. >>>=20 >>> The existing code grew around the original HugeTLB-specific HVO = path, >>> while device DAX developed similar but separate vmemmap optimization >>> handling. As a result, the current implementation carries duplicated >>> logic, boot-time special cases, and subsystem-specific interfaces = around >>> what is fundamentally the same sparse-vmemmap optimization. >>>=20 >>> This series generalizes that optimization into a common framework = used >>> by both HugeTLB and device DAX. >>>=20 >>> The first few patches include some minor bug fixes found during = AI-aided >>> review of the current code. These fixes are not the main goal of the >>> series, but the later refactoring and unification work depends on = them, >>> so they are included here as preparatory changes. >>>=20 >>> The series then reworks the relevant early boot and sparse >>> initialization paths, introduces a generic section-based = sparse-vmemmap >>> optimization infrastructure, switches HugeTLB and device DAX over to = the >>> shared implementation, and removes the old special-case code. >>>=20 >>> ... >>>=20 >>> 46 files changed, 743 insertions(+), 1812 deletions(-) >>=20 >> Gulp. >>=20 >> I think the first 15ish patches (little fixes and cleanups and >> refactorings) are ready to go in immediately? >=20 > I plan to have a (partial ) look at this tomorrow/Friday, but = splitting Thanks. > this series in fixes-that-can-go-straight-away and the feature itself = would make more > sense and help ease the review. Yes. > Head tends to spin a bit when the patchset grows beyond certain number = of patches :-D. >=20 > Would that be possible Munchun? I'd prefer to group the first 19 patches into a single series (titled "Refactor bootmem gigantic hugepage allocation"). Therefore, waiting for your review. :) Once patches 13-19 pass review, I will send them out as a standalone series. Muchun, Thanks. >=20 >=20 >=20 > --=20 > Oscar Salvador > SUSE Labs