linux-kernel - Re: [PATCH RFC 2/2] perf: convert: fix duplicate field names and avoid reserved keywords.

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Message-ID: <20150123084551.GB2709@krava.brq.redhat.com>
Date:	Fri, 23 Jan 2015 09:45:51 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	jeremie.galarneau@...icios.com, rostedt@...dmis.org,
	bigeasy@...utronix.de, lizefan@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] perf: convert: fix duplicate field names and
 avoid reserved keywords.

On Fri, Jan 23, 2015 at 09:57:53AM +0800, Wang Nan wrote:
> On 2015/1/22 21:27, Jiri Olsa wrote:
> > On Thu, Jan 22, 2015 at 01:36:43PM +0800, Wang Nan wrote:
> >> (If Steven Rostedt accept the previous patch which introduce a priv
> >>  field to 'struct format_field', we can use a relative simple method
> >>  for name conversion. If not , perf must track name conversion by
> >>  itself.)
> >>
> >> Some parameters of syscall tracepoints named as 'nr', 'event', etc.
> >> When dealing with them, perf convert to ctf meets some problem:
> >>
> >>  1. If a parameter with name 'nr', it will duplicate syscall's
> >>     common field 'nr'. One such syscall is io_submit().
> >>
> >>  2. If a parameter with name 'event', it is denied to be inserted
> >>     because 'event' is a babeltrace keywork. One such syscall is
> >>     epoll_ctl.
> >>
> >> This patch appends '_dupl_X' suffix to avoid problem 1, prepend a '_'
> >> prefix to avoid problem 2.
> > 
> > I've got compilation error:
> > 
> > util/data-convert-bt.c: In function ‘event_class_add_field’:
> > util/data-convert-bt.c:629:2: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]
> >   while (t = bt_ctf_event_class_get_field_by_name(event_class, name)) {
> > 
> > what's your gcc version? mine's caught that..
> > 
> 
> I also curious why you got so many Werror problems I'm not ever seen,
> until I found a '-w' in my gcc options, which is introduced by your commit
> 
> 47810c1d429bc690e1f5e9467697538921962171: perf data: Disable Werror convert object.
> 
> I'll revert that commit in my tree.

that one was to workaround the regression in babeltrace,
I'm now using sane babeltrace HEAD as advertized by Jeremie:

"In the meantime, testing against Babeltrace master 3baf0856 should be alright."

jirka
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