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b=d9sEWGFiaaRuc0sRdnQAcuG1352EjsHTlcUcZGWkuztARjNwJJPyYsFnT49xnGmu0 7RHw4Tkuma5AimwbVkiWgqlHShrqnXx8/G7FadMgRziOJSchgxeIt/+2oZYCYuX154 ysHzufYNUs+vgv+HRh/pQNvSxxpX86RNqQAgoFFvpfc02+PO91cogUGWhLTSINmPPx x9eXbp0TD4j1ScpA2ICUEfIuZEK+I+4IBrX2hp0brX9ZJEDv0Zav3wHtmIBWiLjrnY yV9VKuehMQ8VweK5VFvGLG5DUYp82+uy11I81WooluYehQahb5lQAYEC1YKZf9zTQw vDF+s8HaV4ZJQ== Message-ID: Date: Fri, 6 Feb 2026 14:08:42 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 00/13] Remove device private pages from physical address space To: Jordan Niethe , linux-mm@kvack.org Cc: balbirs@nvidia.com, matthew.brost@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, ziy@nvidia.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com, jhubbard@nvidia.com, maddy@linux.ibm.com, mpe@ellerman.id.au, ying.huang@linux.alibaba.com References: <20260202113642.59295-1-jniethe@nvidia.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 315A41C0006 X-Stat-Signature: zcj8hin4ntori9jmaracqamstt899em8 X-Rspam-User: X-HE-Tag: 1770383331-37504 X-HE-Meta: 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 3tgaI+AZ FKi2uCFSY5f88roeF9HpH4UnqJU2vIvO3csRYfpXB09GUvjelO0j3vsoSRSOBaZVNPBdUcNrCkW6R/FN68Kn6mBO0vbOQbpUL9JeymTQ5tRyZllfYgarD+JTRNdgTa6ucl25MubOAMna26ovjMV2ribsRm87FDNbwnwLGlHHDilw2iqocy8JqDuhzvmHwdTtf4r4Vi2NOtUo0kXv3Rt+R5pkY8BuJddaMaEf7pvvQWfOL+B2KFakW0wf9kjeh54aPo7E4 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: > By removing the device private pages from the physical address space, > this series also opens up the possibility to moving away from tracking > device private memory using struct pages in the future. This is > desirable as on systems with large amounts of memory these device > private struct pages use a signifiant amount of memory and take a > significant amount of time to initialize. > > Changes in v6 > ------------- > - Fix maybe unused in kgd2kfd_init_zone_device() > - Replace division by PAGE_SIZE with DIV_ROUND_UP() when setting > nr_pages. This mirrors the align up that previously happened in > get_free_mem_region() > > Note removed previous discussion in the cover letter relating to aarch64 > and memremap_pages() as this was actually already addressed in commit > eeb8fdfcf090 ("arm64: Expose the end of the linear map in PHYSMEM_END"). > Now that I stumbled over v6, same comment; planning on taking a look soon. -- Cheers, David