linux-kernel - Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die() in show

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Date:	Tue, 10 Dec 2013 20:55:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die()
 in show_error()

On Wed, 11 Dec 2013 09:40:35 +0900
Namhyung Kim <namhyung@...nel.org> wrote:


> >>> Perhaps call it
> >>>
> >>> 	pevent->filter_error_buffer
> >>>
> >>> ?
> >
> > Hmm.. thinking about it twice, if it's only for filter functions
> > wouldn't it be better moving it to event_filter rather than pevent?
> >
> > 	filter->error_buffer

Agreed.

> >
> 
> One more thinking, if we agree on converting to return error code, does
> pevent_filter_add_filter_str() also need to be changed not to receive
> the third "error_str" argument?

Yes, if we add the filter->error_buffer, we can remove it here.

> 
> And should we extend the error code to include the return value of
> pevent_filter_match() too?  If not, it seems we need to pass another
> argument to receive the actual error code in case of FILTER_ERROR.

I'm a bit confused on this. Perhaps it's something you added in your
patches. If what returns FILTER_ERROR?

> 
> I'm saying these here since they might require interface/signature
> change so will affect existing users like trace-cmd.

I'm OK if they change now. I'll have trace-cmd and other users adapt.
As each currently has their own copy. I've been updating trace-cmd with
what's in tools for a while now, and plan to continue doing that until
we have something that seems good for a public library.

-- Steve
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