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Sun, 01 Nov 2026 07:14:31 +0000 X-Mizu-Trace-ID: f110c669da18e7dc X-Migadu-Flow: FLOW_OUT Message-ID: <2aebd191-5c20-4865-8f2b-8db326ef6ddc@linux.dev> Date: Sun, 1 Nov 2026 15:14:26 +0800 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/12] mm: hugetlb_vmemmap: make vmemmap restoration folio-oriented To: Muchun Song , Oscar Salvador , Andrew Morton , Mike Rapoport Cc: Lance Yang , James Houghton , David Hildenbrand , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261020115306.813483-1-songmuchun@bytedance.com> <20261020115824.823278-1-songmuchun@bytedance.com> <20261020115824.823278-9-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20261020115824.823278-9-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: spk8zixkqqt7mq5gk3b7ck9s13476rgq X-Rspamd-Queue-Id: 64AF640002 X-Rspam-User: X-Rspamd-Server: rspam12 X-Spam-Status: No, score=-17.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793517273-335146 X-HE-Meta: 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 R+nJsH1l yHOh6CmWJujChzrVY5iPgnx37e2VmJZ42ipJWpPDQMReH3e+NxMnFAtTXABD4BbwHgn7/IVwH1Fvysxypl84PIUEtV2i3KBQ2TUgc0J03vArLEJluQcffIGLov2mV1Uf2n49GwWFvvwvMJDUiCR7/Hw35MZ7n3FzNHuAtJ77H0Bvtyj9G2VDma/Jdu36vUCODeyZXhFsukTnGrO2EM3FDjR6gRlQFZOsulWfvVTQ7itZDmklaOH026JisE/6BLnRZH7SfioeILiBRcVTYNRMalaoosW6lQA6Yq3WfKhpFLHdk93wl+MRH+4QEOQaNdZgdbJGohlnhN+btbjh7vZ9nEngMmX6MEWv9dkNKB38nAtuC/IlKauxK2UKNWn04TKgbl7NAPFa7Sc4THRT2HYFytDY+MQiYRyn1zO1Wz3bX3uBdn/qHNzeGDkotAhAjPYNmaaxJ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/20/26 7:58 PM, Muchun Song wrote: > Like optimization, vmemmap restoration operates on one folio at a time, > but the current interface exposes a raw address range and requires the > HugeTLB caller to prepare part of the operation. This splits the common > mechanism across layers and obscures its natural unit of work. > > Make the folio the unit of vmemmap restoration and move the common > mechanics behind a folio-oriented interface. This keeps HugeTLB-specific > eligibility and state in the caller and gives both directions of HVO > consistent folio-level interfaces. > > No functional change intended. > > Signed-off-by: Muchun Song > --- > mm/hugetlb_vmemmap.c | 37 +++++++++++++------------------------ > 1 file changed, 13 insertions(+), 24 deletions(-) Nice cleanup. Reviewed-by: Qi Zheng Thanks, Qi