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Tue, 03 Nov 2026 10:14:46 -0800 (PST) Received: from localhost ([153.61.198.251]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2eb392a5f48sm43693435ad.64.2026.11.03.10.14.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Nov 2026 10:14:46 -0800 (PST) Content-Type: text/plain; charset=UTF-8 Date: Tue, 03 Nov 2026 18:14:45 +0000 Message-Id: Cc: , "Bastien Curutchet" , "Thomas Petazzoni" , , , Subject: Re: [PATCH bpf-next 0/2] selftests/bpf: port test_ftrace.sh into test_progs From: "Alexei Starovoitov" To: =?utf-8?q?Alexis_Lothor=C3=A9?= , "Andrii Nakryiko" , "Eduard Zingerman" , "Ihor Solodrai" , "Daniel Borkmann" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Shuah Khan" In-Reply-To: References: <20261030-ftrace_in_test_progs-v1-0-aa50c5dd1ccc@bootlin.com> Content-Transfer-Encoding: 8bit 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 On Tue, Nov 03, 2026 at 01:13 AM Alexis Lothoré wrote: > I initially went with a ftrace instance, but I came back to global > ftrace because graph function filters (set_graph_function, > set_graph_notrace) are not handled at instance level, only at global > level. But maybe setting only set_ftrace_filter and set_ftrace_notrace > is enough for this test ? That would indeed simplify a lot the setup. Yes. set_ftrace_filter alone is enough. The test needs function_graph and a trampoline on the same function. set_ftrace_filter of the instance does that. >> all functions are patched only the filtered functions > > Are all functions really patched with the current series ? It is still > applying filters. Yes. All but the ones in set_ftrace_notrace. Only set_ftrace_filter and set_ftrace_notrace decide what is patched, and set_ftrace_filter is empty in the series. set_graph_function is a run time check. Every patched function calls into fgraph. Then graph_entry() -> ftrace_graph_addr() drops the ones that are not below bpf_prog_test*. enabled_functions shows what is patched.