linux-kernel - [perf probe] How to ask what variables can be collected at function return?

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Message-ID: <20150928145245.GG6022@kernel.org>
Date:	Mon, 28 Sep 2015 11:52:45 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Wang Nan <wangnan0@...wei.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [perf probe] How to ask what variables can be collected at function
 return?

How to figure out which variables can I collect at function return?
None?

I think we need a better error message :-)

[root@zoo ~]# perf probe -V getname_flags%return
Return probe must be on the head of a real function.
Debuginfo analysis failed.
  Error: Failed to show vars.
[root@zoo ~]# 


- Arnaldo
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