linux-kernel - Re: [PATCH -tip ] [BUGFIX] perf/probe: Fix perf probe to find correct variable DIE

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Message-ID: <20140604122238.GA6902@krava.brq.redhat.com>
Date:	Wed, 4 Jun 2014 14:22:38 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH -tip ] [BUGFIX] perf/probe: Fix perf probe to find
 correct variable DIE

On Wed, Jun 04, 2014 at 09:19:57PM +0900, Masami Hiramatsu wrote:
> (2014/06/04 20:31), Jiri Olsa wrote:
> > On Wed, Jun 04, 2014 at 05:25:02PM +0900, Masami Hiramatsu wrote:
> >> (2014/06/04 5:38), Arnaldo Carvalho de Melo wrote:
> >>> Now trying to reference a bogus member name:
> >>>
> >>> [root@zoo ~]# perf probe 'vfs_getname=getname_flags:65 pathname=result->BOGUS:string'
> >>> result(type:filename) has no member BOGUS.
> >>> Failed to find 'result' in this function.
> >>>   Error: Failed to add events. (-22)
> >>> [root@zoo ~]#
> >>>
> >>> No segfault, albeit it produces a bogus error message, as it clearly
> >>> _finds_ the 'result' variable, its just that it is of a struct type that
> >>> _has_ no such 'BOGUS' _member_.
> >>
> >> Right, I'll fix that.
> > 
> > should I wait for new patchset, or should I take those 2?
> 
> No, those 2 patches are urgently required, because one fixes SEGV critical
> error, and the other fixes a wrong behavior (catch up to the latest
> dwarf), which is also degradation.

ok, I'll queue both of them to perf/urgent

thanks,
jirka
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