linux-kernel - Re: [PATCH v15 00/19] tracing: fprobe: function_graph: Multi-function graph and fprobe on fgraph

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Message-ID: <CAEf4BzZAPjZEZR9m66hPr6srzJwuu=B8zu6cNhxe-7__5+LpHw@mail.gmail.com>
Date: Wed, 18 Sep 2024 23:22:41 +0200
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Steven Rostedt <rostedt@...dmis.org>, 
	Florent Revest <revest@...omium.org>, linux-trace-kernel@...r.kernel.org, 
	LKML <linux-kernel@...r.kernel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>, 
	Alexei Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Alan Maguire <alan.maguire@...cle.com>, Mark Rutland <mark.rutland@....com>, 
	Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Guo Ren <guoren@...nel.org>, 
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v15 00/19] tracing: fprobe: function_graph: Multi-function
 graph and fprobe on fgraph

On Sun, Sep 15, 2024 at 11:09 AM Masami Hiramatsu (Google)
<mhiramat@...nel.org> wrote:
>
> Hi,
>
> Here is the 15th version of the series to re-implement the fprobe on
> function-graph tracer. The previous version is;
>
> https://lore.kernel.org/all/172615368656.133222.2336770908714920670.stgit@devnote2/
>
> This version rebased on Steve's calltime change[1] instead of the last
> patch in the previous series, and adds a bpf patch to add get_entry_ip()
> for arm64. Note that [1] is not included in this series, so please use
> the git branch[2].
>

With LPC and Kernel Recipes back-to-back I won't have time to look
through the code, but I did manage to run some benchmarks tonight, and
they look pretty good now, thanks! Seems like the kprobe regression is
gone, and kretprobes are a bit faster. So, nice work, thanks!

BEFORE
======
kprobe         :   25.052 ± 0.032M/s
kprobe-multi   :   28.102 ± 0.167M/s
kretprobe      :   10.724 ± 0.008M/s
kretprobe-multi:   11.337 ± 0.054M/s

AFTER
=====
kprobe         :   25.206 ± 0.026M/s
kprobe-multi   :   30.167 ± 0.148M/s
kretprobe      :   10.714 ± 0.016M/s
kretprobe-multi:   13.436 ± 0.328M/s

> [1] https://lore.kernel.org/all/20240914214805.779822616@goodmis.org/
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/log/?h=topic/fprobe-on-fgraph
>

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