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b=bgj/n6JEEEDbd7ZONPgf9sWUyp2q0zCHD5DGDiLPtDCCeXXxHHnQ0MgseRuVbjK2R wzUCfFQzRGWTiFuz/t9GTBfimgH4W30WZsfZh3nEYJ1o/tpHnHYujn4C6NExNR6oYu POXvBVfY0egTeSd5rpRgbA+ldG/i4ioUZ2xRgSS4PmqQUCo8bat9fcxXjLfmBkgZFq voXPsmDhnlt0HQGunKulmHWDB7Ickfb3LoUWTQUSdZFNh7BmCpG/a85jZc8NCcNnkq A+4mNpmTgxQ8tKgyCX81yFWteNYHiTPRxSk1YPVfOx47bvbXCO/rv4HflO+AJ9CKSF g0RblB7MwS/IQ== Date: Sun, 2 Aug 2026 14:28:31 +0300 From: Mike Rapoport To: Pratyush Yadav Cc: Pasha Tatashin , Alexander Graf , Muchun Song , Oscar Salvador , David Hildenbrand , Andrew Morton , Jason Miu , Jork Loeser , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 00/22] kho: make boot time huge page allocation work nicely with KHO Message-ID: References: <20260801084833.1897543-1-pratyush@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260801084833.1897543-1-pratyush@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6EE3D4000D X-Stat-Signature: z8jusdaipgfa1dwj3coaeennyepe449j X-HE-Tag: 1785670120-801793 X-HE-Meta: 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 g2twFQNJ tobkZlp5r8M9a+yNFueAGaoLLC/NdunSRTykjz7KhkjB3oN4z93K+08NtUooSVKQtKc72ioT8HKXh8Rs1uIA6dFFMEZaJA8eJLZxTEGIk37CV6Xr3p+mtDqEwUTLHC6pz5BHHXGyYyfhM4iJ9dbXVwIDPsG8TtwD8GlunstLmEC3T+DIWc/iLsn0JBdBDWYEXwYsTFqo79zWYeD9A9A8UAwzSJBj2pRfxlRQAl5N905shNTAuRGhh8voBQy3O+AdL9JGnDFQi6FRqa5IoG8WdLiGkEg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, Aug 01, 2026 at 10:48:09AM +0200, Pratyush Yadav wrote: > From: "Pratyush Yadav (Google)" > > Hi, > > Gigantic huge page allocation is somewhat broken currently with KHO. > > Fix this by introducing the concept of extended scratch areas. They are > areas that the kernel discovers on boot by walking the radix tree and > finding free memory ranges. See patch 10 for more details. > > Muchun Song (1): > mm/mm_init: simplify deferred_free_pages() migratetype init > > Pratyush Yadav (Google) (21): > kho: generalize radix tree APIs > kho: make radix max key width more obvious > kho: disallow wide keys in radix tree > kho: return virtual address of mem_map from kho_get_mem_map() > kho: store incoming radix tree in kho_in > kho: move all memory retrieval logic to kho_mem_retrieve() > kho: add a struct for radix callbacks > kho: add callback for table pages > kho: add data argument to radix walk callback > kho: allow early-boot usage of the KHO radix tree > kho: allow destroying KHO radix tree > kho: add kho_radix_init_tree() > kho: expose kho_scratch_overlap() to kexec_handover.h > kho: initialize kho_scratch pointer earlier in boot > kho: initialize preserved memory map radix tree earlier > mm/mm_init: don't rely on memblock to get KHO scratch migratetype > kho: extend scratch > memblock: always include KHO headers > memblock: make HugeTLB bootmem allocation work with KHO > memblock: add memblock_reserved_hugetlb_size() > kho: exclude hugetlb memory from scratch size calculation This is applied now to kho-scratch branch in the liveupdate repo: https://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux.git/log/?h=kho-scratch On top of mm-stable-6d098029de09 branch in Andrew's mm.git. -- Sincerely yours, Mike.