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Date: Fri, 11 Dec 2009 20:51:00 -0000
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Frederic Weisbecker <fweisbec@gmail.com>,         lkml <linux-kernel@vger.kernel.org>,         Steven Rostedt <rostedt@goodmis.org>,         Jim Keniston <jkenisto@us.ibm.com>,         Ananth N Mavinakayanahalli <ananth@in.ibm.com>,         Christoph Hellwig <hch@infradead.org>,         "Frank Ch. Eigler" <fche@redhat.com>, Jason Baron <jbaron@redhat.com>,         "K.Prasad" <prasad@linux.vnet.ibm.com>,         Peter Zijlstra <peterz@infradead.org>,         Srikar Dronamraju <srikar@linux.vnet.ibm.com>,         systemtap <systemtap@sources.redhat.com>,         DLE <dle-develop@lists.sourceforge.net>
Subject: Re: [PATCH -tip 0/8] perf-probe updates
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References: <20091208220232.10142.2643.stgit@dhcp-100-2-132.bos.redhat.com>  <20091209072220.GA4328@elte.hu>  <20091209084341.GA21333@elte.hu>  <4B1FE022.1030704@redhat.com>  <4B201993.9020005@redhat.com>
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Em Wed, Dec 09, 2009 at 04:41:39PM -0500, Masami Hiramatsu escreveu:
> Masami Hiramatsu wrote:
> >> Here the failure was because the symbol does not exist.
> > 
> > Yeah, so that's what I'm expecting to be implemented with below item :-)
> > 
> >    - Symbol search by libelf/kallsyms
> > 
> > I guess it will be done by using symbol.c.
> > (Actually, current
> 
> Oops, I might miss something, forgot it.
> actually, current perf probe doesn't decode kallsyms/elf, it just depends on
> kprobe-tracer. And kprobe-tracer will return -EINVAL not only if the symbol
> was not found, but also other reasons.
> 
> So, if we want to show below message, we need to decode elf or kallsyms.

Should be easy now with my latest patch :-)
 
> > >
> > > There's similar problems in most other failure cases. Trying to remove a
> > > non-existent probe gives:
> > >
> > >   # perf probe -d test
> > >   Warning: event "probe:test" is not found.