linux-kernel - Re: [PATCH 1/2] perf: convert: fix duplicate field names and avoid reserved keywords.

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Message-ID: <20150121143234.GC6835@krava.brq.redhat.com>
Date:	Wed, 21 Jan 2015 15:32:34 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Wang Nan <wangnan0@...wei.com>, jeremie.galarneau@...icios.com,
	bigeasy@...utronix.de, lizefan@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf: convert: fix duplicate field names and avoid
 reserved keywords.

On Wed, Jan 21, 2015 at 09:25:45AM -0500, Steven Rostedt wrote:
> On Wed, 21 Jan 2015 15:19:38 +0100
> Jiri Olsa <jolsa@...hat.com> wrote:
> 
> > On Wed, Jan 21, 2015 at 07:16:39PM +0800, Wang Nan wrote:
> > > Hi Jiri,
> > > 
> > > I found that only this patch is not enough. When converting such tracepoints,
> > > it uses add_tracepoint_fields_values(..., struct format_field *fields ...),
> > > and fields->name is still the original one.
> > > 
> > > If 'struct format_field' has a field like 'dup_name' we can make things simpler.
> > > However, struct format_field is part of traceevent, not only used by perf.
> > > 
> > > I have no enough time to think on it. Jiri, could you please give me some hints
> > > so I can implement another patch tomorrow?
> > 
> > yea, looks like we either need to add 'void *priv' into 'struct format_field'
> > or if Steven doesn't like it, we'd need to save 'our' field name in some way
> > so it's reachable via format_field::name string.
> > 
> > Steven,
> > we need to use changed format_field::name to interface babeltrace
> > library, because it has restriction that fields within tracepoint
> > should have unique names.
> > 
> > Any chance we could introduce 'void *priv' member to format_field::name ?
> > Maybe with 'destroy_priv' callback to be called when the field is destroyed.
> > 
> > I can provide patch, just wanted to know first if you're not strictly against ;-)
> > 
> 
> I'm not exactly sure what the issue is. I guess I need to see a patch
> to understand better.

ok, will do

jirka
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