linux-kernel - Re: [PATCH 13/18] tracing: Add array type to function based events

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Message-Id: <20180204125012.562129292eaa1843184c4997@kernel.org>
Date:   Sun, 4 Feb 2018 12:50:12 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     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>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-rt-users@...r.kernel.org, linux-trace-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH 13/18] tracing: Add array type to function based events

On Sat, 3 Feb 2018 10:29:03 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Sat, 3 Feb 2018 22:56:15 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > This idea looks good for kprobe events too.
> > I'll try to implement same one :)
> 
> We should have the two re-use the same code.
> 
> In other words, I would like as much code sharing as possible.

Finally it will be, but currently the code base is too far.
I would like to implement it on current code for avoiding
break anything, but refactoring afterwards.

I think current fetch function implementation may be too heavy
with retpoline. I would like to reimplement it with eBPF :)

Thank you,

> 
> -- Steve


-- 
Masami Hiramatsu <mhiramat@...nel.org>