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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 Subject: Re: [PATCH v2 00/69] mm: Generalize HVO for HugeTLB and device DAX Message-Id: <20260513104640.b0f02b844c57f92bc954878e@linux-foundation.org> In-Reply-To: <20260513130542.35604-1-songmuchun@bytedance.com> References: <20260513130542.35604-1-songmuchun@bytedance.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: D935110001A X-Stat-Signature: eqqs8xh99sg4yduhjfysd1ej3zz9orse X-Rspam-User: X-HE-Tag: 1778694402-240425 X-HE-Meta: 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 xNieXFu8 qLneLZUQxOtsLmFJUcmk8eqN5fqJM7V2kbG1joMmwnhDHBy6lKfUMrU6aZnEArze8ijGENQ2luB2+P03wAf0MpDPffWZyq/JNYSFdYRZbGs87tWst8jwv9zla0Kx08PKFVbyNBL5dXUOZTUaa8HcipNgtuZQqjvtUWrZQJnHmSRgBnYrSH/r2ArDjF2xkeOcxDT7U9/OFXn41w5Y3iwITG4ICJPRJplwzGfMytA9lKmXEn78Tqm06RI7TEMwSM0ncBry08xb8hkNhygj4XLputoY29w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 13 May 2026 21:04:28 +0800 Muchun Song wrote: > 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. > > 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. > > This series generalizes that optimization into a common framework used > by both HugeTLB and device DAX. > > 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. > > 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. > > ... > > 46 files changed, 743 insertions(+), 1812 deletions(-) Gulp. I think the first 15ish patches (little fixes and cleanups and refactorings) are ready to go in immediately? Perhaps you could prepare such things as a separate series. Or tell me which ones are suitable and I'll fudge up a [0/N]?