linux-kernel - Re: [PATCH 00/18] [ANNOUNCE] Dynamically created function based events

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Message-ID: <20180203213820.qhsfubqpgndcbfqh@ast-mbp>
Date:   Sat, 3 Feb 2018 13:38:21 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        linux-trace-users <linux-trace-users@...r.kernel.org>,
        acme <acme@...nel.org>, Clark Williams <williams@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>, bristot <bristot@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 00/18] [ANNOUNCE] Dynamically created function based
 events

On Sat, Feb 03, 2018 at 04:17:32PM -0500, Steven Rostedt wrote:
> On Sat, 3 Feb 2018 12:52:08 -0800
> Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
> 
> > It's a user space job.
> 
> BTW, I asked around at DevConf.cz, and nobody I talked with (besides
> Arnaldo), have used eBPF. The "path to hello world" is quite high. This
> interface is extremely simple to use, and one doesn't need to install
> LLVM or other tools to interface with it.
> 
> I used the analogy, that eBPF is like C, and this is like Bash. One is
> much easier to get "Hello World!" out than the other.
> 
> So personally, this is something I know I would use (note, I have
> never used eBPF either). But if I'm the only one to use this
> interface then I'll stop here (and not bother with the function graph
> return interface). If others think this would be helpful, I would ask
> them to speak up now.

I'm not arguing against the patches. I know that there are folks
out there who like to use cat/echo interfaces.
I'm only happy that the whole thing has its own kconfig
that we can keep off in fb kernels to reduce maintenance/support burden.
Just like we do for all sorts of other kernel features.