linux-kernel - Re: [PATCHv7 bpf-next 0/9] uprobe: uretprobe speed up

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Date: Mon, 10 Jun 2024 11:16:14 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
 Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel
 Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-api@...r.kernel.org, linux-man@...r.kernel.org, x86@...nel.org,
 bpf@...r.kernel.org, Song Liu <songliubraving@...com>, Yonghong Song
 <yhs@...com>, John Fastabend <john.fastabend@...il.com>, Peter Zijlstra
 <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, "Borislav
 Petkov (AMD)" <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>, Andy
 Lutomirski <luto@...nel.org>, "Edgecombe, Rick P"
 <rick.p.edgecombe@...el.com>, Deepak Gupta <debug@...osinc.com>, Linus
 Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCHv7 bpf-next 0/9] uprobe: uretprobe speed up

On Wed, 5 Jun 2024 09:42:45 -0700
Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:

> Another ping. It's been two weeks since Jiri posted the last revision
> that got no more feedback to be addressed and everyone seems to be
> happy with it.

Sorry, there's been a lot going on.

> 
> This is an important speed up improvement for uprobe infrastructure in
> general and for BPF ecosystem in particular. "Uprobes are slow" is one
> of the top complaints from production BPF users, and sys_uretprobe
> approach is significantly improving the situation for return uprobes
> (aka uretprobes), potentially enabling new use cases that previously
> could have been too expensive to trace in practice and reducing the
> overhead of the existing ones.
> 
> I'd appreciate the engagement from linux-trace maintainers on this
> patch set. Given it's important for BPF and that a big part of the
> patch set is BPF-based selftests, we'd also be happy to route all this
> through the bpf-next tree (which would actually make logistics for us
> much easier, but that's not the main concern). But regardless of the
> tree, it would be nice to make a decision and go forward with it.

I'll be talking with Masami about this later today.

-- Steve