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([2620:10d:c090:500::4:1637]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7a22ff1599dsm9629028b3a.4.2025.10.20.17.50.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Oct 2025 17:50:39 -0700 (PDT) Message-ID: Subject: Re: [RFC PATCH v2 5/5] btf: add CONFIG_BPF_SORT_BTF_BY_KIND_NAME From: Eduard Zingerman To: Donglin Peng , ast@kernel.org Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Andrii Nakryiko , Alan Maguire , Song Liu , pengdonglin Date: Mon, 20 Oct 2025 17:50:38 -0700 In-Reply-To: <20251020093941.548058-6-dolinux.peng@gmail.com> References: <20251020093941.548058-1-dolinux.peng@gmail.com> <20251020093941.548058-6-dolinux.peng@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-10-20 at 17:39 +0800, Donglin Peng wrote: [...] > diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig > index eb3de35734f0..08251a250f06 100644 > --- a/kernel/bpf/Kconfig > +++ b/kernel/bpf/Kconfig > @@ -101,4 +101,12 @@ config BPF_LSM > =20 > If you are unsure how to answer this question, answer N. > =20 > +config BPF_SORT_BTF_BY_KIND_NAME > + bool "Sort BTF types by kind and name" > + depends on BPF_SYSCALL > + help > + This option sorts BTF types in vmlinux and kernel modules by their > + kind and name, enabling binary search for btf_find_by_name_kind() > + and significantly improving its lookup performance. > + Why having this as an option? There are no downsides to always enabling, right? The cost of sorting btf at build time should be negligible. [...]