linux-kernel - Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86 instruction decoder

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Date:	Mon, 11 May 2009 10:56:31 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	systemtap <systemtap@...rces.redhat.com>,
	kvm <kvm@...r.kernel.org>, Tom Zanussi <zanussi@...cast.net>
Subject: Re: [PATCH -tip v5 0/7] tracing: kprobe-based event tracer and x86
 instruction decoder


On Mon, 11 May 2009, Masami Hiramatsu wrote:
> > 
> > Two high-level comments:
> > 
> >  - There's no self-test - would it be possible to add one? See 
> >    trace_selftest* in kernel/trace/
> 
> I'm not so sure. Currently, it seems that those self-tests are
> only for tracers which define new event-entry on ring-buffer.
> Since this tracer just use ftrace_bprintk, it might need
> another kind of selftest. e.g. comparing outputs with
> expected patterns.
> In that case, would it be better to make a user-space self test
> including filters and tracepoints?

Or have the workings in the selftest in kernel. As if a user started it. 
It does not need to write to the ring buffer, that is just what I did. The 
event selftests don't check if anything was written to the ring buffer, 
they just make sure that the tests don't crash the system.

-- Steve

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