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[2001:1ae9:1c2:4c00:726e:c10f:8833:ff22]) by smtp.gmail.com with ESMTPSA id vh8-20020a170907d38800b00a3f28bf94f8sm1689681ejc.199.2024.02.22.02.18.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Feb 2024 02:18:35 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Thu, 22 Feb 2024 11:18:33 +0100 To: bpf , Alexei Starovoitov , lsf-pc@lists.linux-foundation.org, Masami Hiramatsu , Steven Rostedt , Andrii Nakryiko Subject: [LSF/MM/BPF TOPIC] multi kprobe updates Message-ID: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline There's few ongoing kprobe multi features that I'd like to give an update about and discuss. - Support to execute bpf program for both entry and return probes. This way we don't need to create 2 links when we need to run bpf program on entry/return probes of the same function, first rfc posted [0]. - In addition to above feature introduce shared 'session' data between entry and exit probe accessible from bpf program, originally discussed in [1]. - Allow to use per program re-entry checks instead of current hard coded per cpu re-entry check, or just change to per program check directly. - There's ongoing development of patchset moving fprobe implementation from function tracer on top of fgraph tracer by Masami Hiramatsu [2]. As kprobe multi link is implemented via fprobe I'd like to give an update what this change means for kprobe multi link. [0] https://lore.kernel.org/bpf/20240207153550.856536-1-jolsa@kernel.org/ [1] https://lore.kernel.org/bpf/CAEf4Bzb6sPXAtDVke=CtCXev0mxhfgEG_O-xUA-e9-8NnbBtJQ@mail.gmail.com/ [2] https://lore.kernel.org/bpf/170723204881.502590.11906735097521170661.stgit@devnote2/