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Re: [PATCH -tip 0/8] perf-probe updates
- From: Arnaldo Carvalho de Melo <acme at redhat dot com>
- To: Masami Hiramatsu <mhiramat at redhat dot com>
- Cc: Ingo Molnar <mingo at elte dot hu>, Frederic Weisbecker <fweisbec at gmail dot com>, lkml <linux-kernel at vger dot kernel dot org>, Steven Rostedt <rostedt at goodmis dot org>, Jim Keniston <jkenisto at us dot ibm dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Christoph Hellwig <hch at infradead dot org>, "Frank Ch. Eigler" <fche at redhat dot com>, Jason Baron <jbaron at redhat dot com>, "K.Prasad" <prasad at linux dot vnet dot ibm dot com>, Peter Zijlstra <peterz at infradead dot org>, Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>
- Date: Fri, 11 Dec 2009 18:51:41 -0200
- Subject: Re: [PATCH -tip 0/8] perf-probe updates
- 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>
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.