linux-kernel - Re: [PATCH 2/9] ftrace: Add register_ftrace_direct

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Message-ID: <aNQVmrGCW08zF9Kp@krava>
Date: Wed, 24 Sep 2025 18:00:26 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Steven Rostedt <rostedt@...nel.org>
Cc: Jiri Olsa <olsajiri@...il.com>, Florent Revest <revest@...gle.com>,
	Mark Rutland <mark.rutland@....com>, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Menglong Dong <menglong8.dong@...il.com>
Subject: Re: [PATCH 2/9] ftrace: Add register_ftrace_direct_hash function

On Wed, Sep 24, 2025 at 11:07:03AM -0400, Steven Rostedt wrote:
> On Wed, 24 Sep 2025 16:37:03 +0200
> Jiri Olsa <olsajiri@...il.com> wrote:
> 
> > I have bpf changes using this that I did not post yet, but even with that
> > there's probably no reason to export this.. will remove
> 
> I'm interested in seeing these patches, as the ftrace hashes were
> supposed to be opaque from other parts of the kernel.

branch:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/tracing_multi

used in this commit:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?h=bpf/tracing_multi&id=8814108949537edaae84fbeee1cbc28280590b7f

background.. it's poc code for bpf tracing-multi attachment. Most likely we will
go with Menglong change instead [1], but it could use this direct interface in a
same way for speeding up the attachment

jirka


[1] https://lore.kernel.org/bpf/20250528034712.138701-1-dongml2@chinatelecom.cn/