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Mon, 03 Nov 2025 06:50:11 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-640b977e6acsm4056741a12.25.2025.11.03.06.50.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 06:50:10 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id B7D07328476; Mon, 03 Nov 2025 15:50:09 +0100 (CET) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= To: Byungchul Park Cc: linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel_team@skhynix.com, harry.yoo@oracle.com, ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, kuba@kernel.org, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, saeedm@nvidia.com, leon@kernel.org, tariqt@nvidia.com, mbloch@nvidia.com, andrew+netdev@lunn.ch, edumazet@google.com, pabeni@redhat.com, akpm@linux-foundation.org, 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, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, ilias.apalodimas@linaro.org, willy@infradead.org, brauner@kernel.org, kas@kernel.org, yuzhao@google.com, usamaarif642@gmail.com, baolin.wang@linux.alibaba.com, almasrymina@google.com, asml.silence@gmail.com, bpf@vger.kernel.org, linux-rdma@vger.kernel.org, sfr@canb.auug.org.au, dw@davidwei.uk, ap420073@gmail.com, dtatulea@nvidia.com Subject: Re: [RFC mm v5 2/2] mm: introduce a new page type for page pool in page type In-Reply-To: <20251103123942.GA64460@system.software.com> References: <20251103075108.26437-1-byungchul@sk.com> <20251103075108.26437-3-byungchul@sk.com> <87jz07pajq.fsf@toke.dk> <20251103123942.GA64460@system.software.com> X-Clacks-Overhead: GNU Terry Pratchett Date: Mon, 03 Nov 2025 15:50:09 +0100 Message-ID: <87h5vbp3vi.fsf@toke.dk> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Byungchul Park writes: > On Mon, Nov 03, 2025 at 01:26:01PM +0100, Toke H=C3=B8iland-J=C3=B8rgense= n wrote: >> Byungchul Park writes: >>=20 >> > Currently, the condition 'page->pp_magic =3D=3D PP_SIGNATURE' is used = to >> > determine if a page belongs to a page pool. However, with the planned >> > removal of ->pp_magic, we should instead leverage the page_type in >> > struct page, such as PGTY_netpp, for this purpose. >> > >> > Introduce and use the page type APIs e.g. PageNetpp(), __SetPageNetpp(= ), >> > and __ClearPageNetpp() instead, and remove the existing APIs accessing >> > ->pp_magic e.g. page_pool_page_is_pp(), netmem_or_pp_magic(), and >> > netmem_clear_pp_magic(). >> > >> > This work was inspired by the following link: >> > >> > [1] https://lore.kernel.org/all/582f41c0-2742-4400-9c81-0d46bf4e8314@g= mail.com/ >> > >> > While at it, move the sanity check for page pool to on free. >> > >> > Suggested-by: David Hildenbrand >> > Co-developed-by: Pavel Begunkov >> > Signed-off-by: Pavel Begunkov >> > Signed-off-by: Byungchul Park >> > Acked-by: David Hildenbrand >> > Acked-by: Zi Yan >> > Acked-by: Mina Almasry >>=20 >> Acked-by: Toke H=C3=B8iland-J=C3=B8rgensen >>=20 >> IIUC, this will allow us to move the PP-specific fields out of struct >> page entirely at some point, right? What are the steps needed to get to >> that point after this? > > Yes, it'd be almost done once this set gets merged :-) > > Will check if I can safely remove pp fields from struct page, and do > it! Sounds good, thanks! -Toke