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Mon, 02 Mar 2026 04:48:00 -0800 (PST) Received: from cloudflare.com ([104.28.193.185]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-65fac06e48asm3422175a12.29.2026.03.02.04.47.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Mar 2026 04:47:59 -0800 (PST) From: Jakub Sitnicki To: Andrey Grodzovsky Cc: , , , , , , , , Subject: Re: [RFC PATCH bpf-next v3 0/3] Optimize kprobe.session attachment for exact function names In-Reply-To: <20260227204052.725813-1-andrey.grodzovsky@crowdstrike.com> (Andrey Grodzovsky's message of "Fri, 27 Feb 2026 15:40:49 -0500") References: <20260227204052.725813-1-andrey.grodzovsky@crowdstrike.com> Date: Mon, 02 Mar 2026 13:47:58 +0100 Message-ID: <87o6l6e6td.fsf@cloudflare.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Fri, Feb 27, 2026 at 03:40 PM -05, Andrey Grodzovsky wrote: > - Patch 1: libbpf detects exact function names (no wildcards) in > bpf_program__attach_kprobe_multi_opts() and bypasses kallsyms parsing, > passing the symbol directly to the kernel via syms[] array. > ESRCH is normalized to ENOENT for API consistency. FWIW, Ivan was also trying to make it faster from the kernel side: https://lore.kernel.org/bpf/20260129-ivan-bpf-ksym-cache-v1-1-ca503070dcc0@cloudflare.com/ But, IIUC, with this change we're not hitting get_ksymbol_bpf at all.