linux-kernel - Re: [PATCH perf/core ] perf-probe: Fix to track down unnamed union/structure members

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Date:	Wed, 1 Apr 2015 11:41:11 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, namhyung@...nel.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core ] perf-probe: Fix to track down unnamed
 union/structure members

Em Wed, Apr 01, 2015 at 06:08:17PM +0900, Masami Hiramatsu escreveu:
> Ping?

<SNIP>

> > With this patch, perf probe can access unnamed fields.
> >   -----
> >   #./perf probe -nfx ./perf lock__delete ops 'locked_ops=ops->locked.ops'
> >   Added new event:
> >     probe_perf:lock__delete (on lock__delete in /home/mhiramat/ksrc/linux-3/tools/perf/perf with ops locked_ops=ops->locked.ops)

> >   You can now use it in all perf tools, such as:

> >           perf record -e probe_perf:lock__delete -aR sleep 1
> >   -----

> > The original report of this issue is: https://lkml.org/lkml/2015/3/5/431

what am I doing wrong?

[root@...andy ~]# perf probe ~acme/bin/perf lock__delete 'locked_ops=ops'
Added new event:
  probe_perf:lock__delete (on lock__delete in /home/acme/bin/perf with locked_ops=ops)

You can now use it in all perf tools, such as:

	perf record -e probe_perf:lock__delete -aR sleep 1

[root@...andy ~]# perf probe -d probe_perf:*
Removed event: probe_perf:lock__delete
[root@...andy ~]# perf probe ~acme/bin/perf lock__delete 'locked_ops=ops->locked'
Semantic error: locked must be referred by '.'
  Error: Failed to add events.
[root@...andy ~]# perf probe ~acme/bin/perf lock__delete 'locked_ops=ops.locked'
Semantic error: locked must be referred by '->'
  Error: Failed to add events.
[root@...andy ~]# perf probe ~acme/bin/perf lock__delete 'locked_ops=ops->locked'
Semantic error: locked must be referred by '.'
  Error: Failed to add events.
[root@...andy ~]# perf probe ~acme/bin/perf lock__delete 'locked_ops=ops->locked.ops'
Semantic error: locked must be referred by '.'
  Error: Failed to add events.
[root@...andy ~]#
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