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([2620:10d:c090:500::5:99aa]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-ba1f87a710asm3616987a12.30.2025.11.04.16.19.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Nov 2025 16:19:20 -0800 (PST) Message-ID: Subject: Re: [RFC PATCH v4 3/7] libbpf: Optimize type lookup with binary search for sorted BTF From: Eduard Zingerman To: Andrii Nakryiko , Donglin Peng Cc: ast@kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Alan Maguire , Song Liu , pengdonglin Date: Tue, 04 Nov 2025 16:19:19 -0800 In-Reply-To: References: <20251104134033.344807-1-dolinux.peng@gmail.com> <20251104134033.344807-4-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 Tue, 2025-11-04 at 16:11 -0800, Andrii Nakryiko wrote: [...] > > @@ -897,44 +903,134 @@ int btf__resolve_type(const struct btf *btf, __u= 32 type_id) > > return type_id; > > } > >=20 > > -__s32 btf__find_by_name(const struct btf *btf, const char *type_name) > > +/* > > + * Find BTF types with matching names within the [left, right] index r= ange. > > + * On success, updates *left and *right to the boundaries of the match= ing range > > + * and returns the leftmost matching index. > > + */ > > +static __s32 btf_find_type_by_name_bsearch(const struct btf *btf, cons= t char *name, > > + __s32 *left, __s32 *rig= ht) >=20 > I thought we discussed this, why do you need "right"? Two binary > searches where one would do just fine. I think the idea is that there would be less strcmp's if there is a long sequence of items with identical names.