linux-kernel - Re: Re: [RFC PATCH 00/28] ktap: A lightweight dynamic tracing tool for Linux

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Message-ID: <20140408090836.GN11096@twins.programming.kicks-ass.net>
Date:	Tue, 8 Apr 2014 11:08:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Olsa <jolsa@...hat.com>, Geoff.Levand@...wei.com
Subject: Re: Re: [RFC PATCH 00/28] ktap: A lightweight dynamic tracing tool
 for Linux

On Tue, Apr 08, 2014 at 04:40:36PM +0900, Masami Hiramatsu wrote:
> (2014/04/07 22:55), Peter Zijlstra wrote:
> > On Wed, Apr 02, 2014 at 09:42:03AM +0200, Ingo Molnar wrote:
> >> I'd suggest using C syntax instead initially, because that's what the 
> >> kernel is using.
> >>
> >> The overwhelming majority of people probing the kernel are 
> >> programmers, so there's no point in inventing new syntax, we should 
> >> reuse existing syntax!
> > 
> > Yes please, keep it C, I forever forget all other syntaxes. While I have
> > in the past known other languages, I never use them frequently enough to
> > remember them. And there's nothing more frustrating than having to fight
> > a tool/language when you just want to get work done.
> 
> Why wouldn't you write a kernel module in C directly? :)
> It seems that all what you need is not a tracing language nor a bytecode
> engine, but an well organized tracing APIs(library?) for writing a kernel
> module for tracing...

Most my kernels are CONFIG_MODULE=n :-) Also, I never can remember how
to do modules.

That said; what I currently do it hack the kernel with debug bits and
pieces and run that, which is effectively the same. Its just that its
impossible to save/share these hacks in any sane fashion.

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