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b=RuNIprlM/03pt2+kYdMFiMNcIZSFuPeIyIPGB7plON7IfYmTJRVJihkaLTtq3yJKL 9pmGhnKOP19kgIq5HWf36qw9Lh1E/QuJMPzzvh/o4JtNLxbLy/G6ljHu353ZFtJQhy erbCFN2FgZpwoB18x/oAKYO7eVeQW67nOfNXNaxYU0chKv8fflMyLx4ubKbDejXdkm ZM1aYGrS2xKvFhhGNejpdXRAJtd999N9o13wWSvuMWm83rKhjWLJNR7F8NhwOxyYVV jkBp9POInlPrEo0gIfo+v4Q0pbEVYuQYGvVLgDp1l6ES5F82adY4GpeuTE3K4IIYki PzOOSB8NqOwuQ== Date: Mon, 9 Jun 2025 12:32:55 -0700 From: Jakub Kicinski To: Byungchul Park Cc: willy@infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel_team@skhynix.com, almasrymina@google.com, ilias.apalodimas@linaro.org, harry.yoo@oracle.com, hawk@kernel.org, akpm@linux-foundation.org, davem@davemloft.net, john.fastabend@gmail.com, andrew+netdev@lunn.ch, asml.silence@gmail.com, toke@redhat.com, tariqt@nvidia.com, edumazet@google.com, pabeni@redhat.com, saeedm@nvidia.com, leon@kernel.org, ast@kernel.org, daniel@iogearbox.net, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, horms@kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, vishal.moola@gmail.com Subject: Re: [PATCH net-next 1/9] netmem: introduce struct netmem_desc mirroring struct page Message-ID: <20250609123255.18f14000@kernel.org> In-Reply-To: <20250609043225.77229-2-byungchul@sk.com> References: <20250609043225.77229-1-byungchul@sk.com> <20250609043225.77229-2-byungchul@sk.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4802880007 X-Stat-Signature: no4ahkjzehpcwc8rwh8kbs3f15junq7h X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1749497579-771986 X-HE-Meta: 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 q10zA7gH PVhmvYeIkJj/mDhVTSdVEb+gcMYuS6RRXEc85qjnpWlPPBNqKq0WxeSNGTXVYLYlpa5/QNt7VD3T2dxYZH6VZ/oFZ38WXfmPrB4Gq7bBJRYxO5lZXd7Xc2c+uODveLSgi9O0sEAliuS6G4uSyGAV5spuKCQsbdbFqU0+lamByQAcPtboZCaAjdnS6nXHOI6ipfjO6y0i4UZr480nh9sZ5xinGgMV7uAMnBO+UrP+Py3GhheYPzbVp91EJzOBIXQ6fopboTNipoELBwSuxNS7ncMKZuHz5Z8ONUdtuSsxzRxuArJ7VW5mkjG6oWjZIxHTxSDhsn4zE6vkqOrjGjxkqANxhM/mdNfvg7AU6403LCdX7QfVP0uU6bfl0HLqBNxziu4Lq 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: On Mon, 9 Jun 2025 13:32:17 +0900 Byungchul Park wrote: > To simplify struct page, the page pool members of struct page should be > moved to other, allowing these members to be removed from struct page. > > Introduce a network memory descriptor to store the members, struct > netmem_desc, and make it union'ed with the existing fields in struct > net_iov, allowing to organize the fields of struct net_iov. What's the intended relation between the types? netmem_ref exists to clearly indicate that memory may not be readable. Majority of memory we expect to allocate from page pool must be kernel-readable. What's the plan for reading the "single pointer" memory within the kernel? I think you're approaching this problem from the easiest and least relevant direction. Are you coordinating with David Howells?