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Mon, 13 May 2024 16:25:27 +0000 Received: from BLAPR10MB5267.namprd10.prod.outlook.com ([fe80::372c:5fce:57c3:6a03]) by BLAPR10MB5267.namprd10.prod.outlook.com ([fe80::372c:5fce:57c3:6a03%4]) with mapi id 15.20.7544.052; Mon, 13 May 2024 16:25:27 +0000 Message-ID: <5e2acba0-5860-4e6d-8b5f-bb63bd4d89f8@oracle.com> Date: Mon, 13 May 2024 17:25:23 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 bpf-next 03/11] libbpf: add btf__parse_opts() API for flexible BTF parsing To: Eduard Zingerman , andrii@kernel.org, jolsa@kernel.org, acme@redhat.com, quentin@isovalent.com Cc: mykolal@fb.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, houtao1@huawei.com, bpf@vger.kernel.org, masahiroy@kernel.org, mcgrof@kernel.org, nathan@kernel.org References: <20240510103052.850012-1-alan.maguire@oracle.com> <20240510103052.850012-4-alan.maguire@oracle.com> Content-Language: en-GB From: Alan Maguire In-Reply-To: Content-Type: text/plain; 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This will allow consumers to retrieve BTF from >> .BTF.base sections (BTF_BASE_ELF_SEC) also. >> >> Signed-off-by: Alan Maguire >> --- > > For the sake of discussion, what are the benefits of adding > btf__parse_opts(), compared to modifying btf__parse() to check if > .BTF.base is present and acting accordingly? > btf__parse() already does a guess if passed argument is an ELF or a > RAW file, so such guessing semantics seems to be a natural extension. It's a good idea. The only thing I'd say against it is that we already have existing semantics there that are well-established, and the .BTF.base scenario will be relatively rare, yet the check would I think be a tax all .BTF-only cases will have to pay. We'd presumably check .BTF.base, and if not present check for .BTF. So all callers of btf__parse() when accessing .BTF sections would be checking for .BTF.base first. In that context, it seemed to make sense to support an explicit request for a specific section (via btf__parse_opts()) rather than inducing overhead in existing checks. But again, if the overhead isn't seen as an issue, we could absolutely do it.