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Mon, 19 Oct 2026 09:58:47 -0700 (PDT) Received: from localhost ([153.61.198.248]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea1501f4a7sm3688635ad.43.2026.10.19.09.58.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Oct 2026 09:58:46 -0700 (PDT) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 19 Oct 2026 16:58:45 +0000 Message-Id: Subject: Re: [PATCH bpf-next 0/5] bpf: Expose pinned arenas as sized bpffs files From: "Alexei Starovoitov" To: "Andrii Nakryiko" Cc: "Andrea Righi" , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Ihor Solodrai" , "John Fastabend" , "Josh Don" , "Vineeth Pillai" , "Balbir Singh" , "Shameer Kolothum" , "Himadri Chhaya-Shailesh" , "NchangRoy" , , X-Mailer: aerc 0.20.1-349-gb940a4174a3e-dirty References: <20261010224902.1232178-1-arighi@nvidia.com> In-Reply-To: On Mon Oct 19, 2026 at 4:19 PM UTC, Andrii Nakryiko wrote: > > Yeah, there are just so many cases where we have some memory that is > special in some way (e.g., huge page-backed memory, or some IOMMU, > e.g., that doorbell stuff, which, if I understand correctly, is done > though writes to specially set up memory ranges), and we can't shove > all this into BPF_MAP_CREATE interface if we want to have BPF program > accessing that memory. So having a generic way to just bolt ARRAY on > top of already created memory seems like a useful primitive. I see. In such light the use case makes sense to me.