linux-kernel - Re: [PATCH 0/8] bpf: Add fprobe link

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Date:   Thu, 3 Feb 2022 16:06:36 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <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>,
        Jiri Olsa <olsajiri@...il.com>
Subject: Re: [PATCH 0/8] bpf: Add fprobe link

On Wed, Feb 02, 2022 at 09:30:21AM -0800, Alexei Starovoitov wrote:
> On Wed, Feb 2, 2022 at 9:24 AM Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Wed, Feb 02, 2022 at 09:09:53AM -0800, Alexei Starovoitov wrote:
> > > On Wed, Feb 2, 2022 at 5:53 AM Jiri Olsa <jolsa@...hat.com> wrote:
> > > >
> > > > hi,
> > > > this patchset adds new link type BPF_LINK_TYPE_FPROBE that attaches kprobe
> > > > program through fprobe API [1] instroduced by Masami.
> > >
> > > No new prog type please.
> > > I thought I made my reasons clear earlier.
> > > It's a multi kprobe. Not a fprobe or any other name.
> > > The kernel internal names should not leak into uapi.
> > >
> >
> > well it's not new prog type, it's new link type that allows
> > to attach kprobe program to multiple functions
> >
> > the original change used BPF_LINK_TYPE_RAW_KPROBE, which did not
> > seem to fit anymore, so I moved to FPROBE, because that's what
> > it is ;-)
> 
> Now I don't like the fprobe name even more.
> Why invent new names? It's an ftrace interface.

how about ftrace_probe ?

> 
> > but if you don't want new name in uapi we could make this more
> > obvious with link name:
> >   BPF_LINK_TYPE_MULTI_KPROBE
> >
> > and bpf_attach_type:
> >   BPF_TRACE_MULTI_KPROBE
> 
> I'd rather get rid of fprobe name first.
>

Masami, any idea?

thanks,
jirka