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[146.241.232.21]) by smtp.gmail.com with ESMTPSA id b11-20020a5d45cb000000b0033afd49cac7sm1404811wrs.43.2024.02.02.00.36.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Feb 2024 00:36:40 -0800 (PST) Message-ID: <868b806f0d6b365334ac79a11a3a1a8a1588cbdf.camel@redhat.com> Subject: Re: [PATCH net-next v4 2/5] page_frag: unify gfp bits for order 3 page allocation From: Paolo Abeni To: Yunsheng Lin , davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Duyck , Alexander Duyck , "Michael S. Tsirkin" , Jason Wang , Andrew Morton , Eric Dumazet , kvm@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org Date: Fri, 02 Feb 2024 09:36:38 +0100 In-Reply-To: <2e8606b1-81c2-6f3f-622c-607db5e90253@huawei.com> References: <20240130113710.34511-1-linyunsheng@huawei.com> <20240130113710.34511-3-linyunsheng@huawei.com> <81c37127dda0f2f69a019d67d4420f62c995ee7f.camel@redhat.com> <2e8606b1-81c2-6f3f-622c-607db5e90253@huawei.com> Autocrypt: addr=pabeni@redhat.com; prefer-encrypt=mutual; keydata=mQINBGISiDUBEAC5uMdJicjm3ZlWQJG4u2EU1EhWUSx8IZLUTmEE8zmjPJFSYDcjtfGcbzLPb63BvX7FADmTOkO7gwtDgm501XnQaZgBUnCOUT8qv5MkKsFH20h1XJyqjPeGM55YFAXc+a4WD0YyO5M0+KhDeRLoildeRna1ey944VlZ6Inf67zMYw9vfE5XozBtytFIrRyGEWkQwkjaYhr1cGM8ia24QQVQid3P7SPkR78kJmrT32sGk+TdR4YnZzBvVaojX4AroZrrAQVdOLQWR+w4w1mONfJvahNdjq73tKv51nIpu4SAC1Zmnm3x4u9r22mbMDr0uWqDqwhsvkanYmn4umDKc1ZkBnDIbbumd40x9CKgG6ogVlLYeJa9WyfVMOHDF6f0wRjFjxVoPO6p/ZDkuEa67KCpJnXNYipLJ3MYhdKWBZw0xc3LKiKc+nMfQlo76T/qHMDfRMaMhk+L8gWc3ZlRQFG0/Pd1pdQEiRuvfM5DUXDo/YOZLV0NfRFU9SmtIPhbdm9cV8Hf8mUwubihiJB/9zPvVq8xfiVbdT0sPzBtxW0fXwrbFxYAOFvT0UC2MjlIsukjmXOUJtdZqBE3v3Jf7VnjNVj9P58+MOx9iYo8jl3fNd7biyQWdPDfYk9ncK8km4skfZQIoUVqrWqGDJjHO1W9CQLAxkfOeHrmG29PK9tHIwARAQABtB9QYW9sbyBBYmVuaSA8cGFiZW5pQHJlZGhhdC5jb20+iQJSBBMBCAA8FiEEg1AjqC77wbdLX2LbKSR5jcyPE6QFAmISiDUCGwMFCwkIBwIDIgIBBhUKCQgLAgQWAgMBAh4HAheAAAoJECkkeY3MjxOkJSYQAJcc6MTsuFxYdYZkeWjW//zbD3ApRHzpNlHLVSuJqHr9/aDS+tyszgS8jj9MiqAL zgq4iZbg 7ZxN9ZsDL38qVIuFkSpgMZCiUHdxBC11J8nbBSLlpnc924UAyr5XrGA99 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 nM5kRh2q iWjoCy8L35zPqR5TV+f5WR5hTVCqmLHSgm1jxwKhPg9L+GfuE4d0SWd84y GeOB3sSxlhWsuTj1K6K3MO9srD9hr0puqjO9sAizd0BJP8ucf/AACfrgmzIqZXCfVS7jJ/M+0ic+j1Si3yY8wYPEi3dvbVC0zsoGj9n1R7B7L9c3g1pZ4L9ui428vnPiMnDN3jh9OsdaXeWLvSvTylYvw9q0DEXVQTv4/OkcoMrfEkfbXbtZ3PRlAiddSZA5BDEkkm6P9KA2YAuooi1OD9d4MW8LFAeEicvHG+TPO6jtKTacdXDRe611EfRwTjBs19HmabSUfFcumL6BlVyceIoSqXFe5jOfGpbBevTZtg4kTSHqymGb6ra6sKs+/9aJiONs5NXY7iacZ55qG3Ib1cpQTps9bQILnqpwL2VTaH9TPGWwMY3Nc2VEc08zsLrXnA/yZKqZ1YzSY9MGXWYLkCDQRiEog1ARAAyXMKL+x1lDvLZVQjSUIVlaWswc0nV5y2EzBdbdZZCP3ysGC+s+n7xtq0o1wOvSvaG9h5q7sYZs+AKbuUbeZPu0bPWKoO02i00yVoSgWnEqDbyNeiSW+vI+VdiXITV83lG6pS+pAoTZlRROkpb5xo0gQ5ZeYok8MrkEmJbsPjdoKUJDBFTwrRnaDOfb+Qx1D22PlAZpdKiNtwbNZWiwEQFm6mHkIVSTUe2zSemoqYX4QQRvbmuMyPIbwbdNWlItukjHsffuPivLF/XsI1gDV67S1cVnQbBgrpFDxN62USwewXkNl+ndwa+15wgJFyq4Sd+RSMTPDzDQPFovyDfA/jxN2SK1Lizam6o+LBmvhIxwZOfdYH8bdYCoSpqcKLJVG3qVcTwbhGJr3kpRcBRz39Ml6iZhJyI3pEoX3bJTlR5Pr1Kjpx13qGydSMos94CIYWAKhegI06aTdvvuiigBwjngo/Rk5S+iEGR5KmTqGyp27o6YxZy6D4NIc6PKUzhIUx fvuHNvfu sD2W1U7eyLdm/jCgticGDsRtweytsgCSYfbz0gdgUuL3EBYN3JLbAU+UZpy 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 User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 8A9C0C0006 X-Stat-Signature: 7udkw7ghso5gtghsd7yz674q3f17uhjy X-HE-Tag: 1706863006-616234 X-HE-Meta: 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 0JEaZnb5 T30cPgKQKdMWz18QYyWeanbmNA0Nr8PLcvu0fFtp/+9NsgHPZ61/Zjp17U2gL4HYkmc1pOFDz4VHQDLIukLErWIj1567ga+cKgLJ1LRj3Qm2kK0+OXlpFNx5F3Mb3L8qJtxctj0VTfUYWYfMo1g0ed2oMasL9hd/oAYdsVy0lkjDF8WtW42LQz2EPsi6sSmivwMp0/i+LljdySVdmyLqVF95pveraojfUlMpuNhofu/vwkVeB1iNiiXgOPPNNLbLi+Vg3LQYLJPmOEBn1NW6a5oVaSIV54PrH2B6TrOSYwtoFf5w65T6YzYzbZC04ACEflyAzhQXj1Qe57NaWS9nkA2Hf9lr5wMQYOJufpwIre4bI1+/LhETLlymt/J+M2mjjL4duy+0nnjk7HsigrXtTeYK7cTuhSTYYms1BWT7Ca+F/NdPfOAaF/E0d4eEk02OMWjzUQKra7k7FdhmDr5CY4ED3gG081yPSUV5lSXZfvV4q/CE= 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 Fri, 2024-02-02 at 10:10 +0800, Yunsheng Lin wrote: > On 2024/2/1 21:16, Paolo Abeni wrote: >=20 > > from the __page_frag_cache_refill() allocator - which never accesses > > the memory reserves. >=20 > I am not really sure I understand the above commemt. > The semantic is the same as skb_page_frag_refill() as explained above > as my understanding. Note that __page_frag_cache_refill() use 'gfp_mask' > for allocating order 3 pages and use the original 'gfp' for allocating > order 0 pages. You are right! I got fooled misreading 'gfp' as 'gfp_mask' in there. > > I'm unsure we want to propagate the __page_frag_cache_refill behavior > > here, the current behavior could be required by some systems. > >=20 > > It looks like this series still leave the skb_page_frag_refill() > > allocator alone, what about dropping this chunk, too?=20 >=20 > As explained above, I would prefer to keep it as it is as it seems > to be quite obvious that we can avoid possible pressure for mm by > not using memory reserve for order 3 pages as we have the fallback > for order 0 pages. >=20 > Please let me know if there is anything obvious I missed. >=20 I still think/fear=C2=A0that behaviours changes here could have subtle/negative side effects - even if I agree the change looks safe. I think the series without this patch would still achieve its goals and would be much more uncontroversial. What about move this patch as a standalone follow-up? Thanks! Paolo