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Date: Thu, 13 Jan 2022 22:18:45 +0900 From: Masami Hiramatsu <mhiramat@...nel.org> To: Jiri Olsa <jolsa@...hat.com> Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org, bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...omium.org>, Steven Rostedt <rostedt@...dmis.org>, "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>, Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>, "David S . Miller" <davem@...emloft.net> Subject: Re: [RFC PATCH v2 0/8] fprobe: Introduce fprobe function entry/exit probe On Thu, 13 Jan 2022 13:27:34 +0100 Jiri Olsa <jolsa@...hat.com> wrote: > On Wed, Jan 12, 2022 at 05:01:15PM +0100, Jiri Olsa wrote: > > On Wed, Jan 12, 2022 at 11:02:46PM +0900, Masami Hiramatsu wrote: > > > Hi Jiri and Alexei, > > > > > > Here is the 2nd version of fprobe. This version uses the > > > ftrace_set_filter_ips() for reducing the registering overhead. > > > Note that this also drops per-probe point private data, which > > > is not used anyway. > > > > > > This introduces the fprobe, the function entry/exit probe with > > > multiple probe point support. This also introduces the rethook > > > for hooking function return as same as kretprobe does. This > > > > nice, I was going through the multi-user-graph support > > and was wondering that this might be a better way > > > > > abstraction will help us to generalize the fgraph tracer, > > > because we can just switch it from rethook in fprobe, depending > > > on the kernel configuration. > > > > > > The patch [1/8] and [7/8] are from your series[1]. Other libbpf > > > patches will not be affected by this change. > > > > I'll try the bpf selftests on top of this > > I'm getting crash and stall when running bpf selftests, > the fprobe sample module works fine, I'll check on that Hmm, would you mean tools/testing/selftests/bpf/prog_tests/ ? Let me check it too. Thank you, -- Masami Hiramatsu <mhiramat@...nel.org>
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