linux-kernel - Re: [PATCH 5/6] tools lib traceevent: Add page

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Date:	Sat, 13 Apr 2013 11:08:08 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] tools lib traceevent: Add page_size field to pevent

2013-04-12 (금), 21:26 -0400, Steven Rostedt:
> On Sat, 2013-04-13 at 10:17 +0900, Namhyung Kim wrote:
> 
> > > 
> > > I just want to know more about this patch before I ack it.
> > 
> > The page size of traced system can be different than current system's
> > because the recorded data file might be analyzed in a different machine.
> > In this case we should use original page size of traced system when
> > accessing the data file, so this information needs to be saved.
> 
> I understand that, it's just strange that it's not used anywhere in the
> library, or the patch series (that I can find).
> 
> It would make more sense if another patch used this new interface. I'm
> sure new code will, but the patch should be part of a patch series that
> needs it.

I know you knew that already. :)

I think it only affects trace-cmd as it's the only user that accesses
raw ring-buffer contents for now.  I found it during writing code also
accesses the ring buffer (with kbuffer code) - perf ftrace. :)

But the code is in a very early stage and needs to handle so many things
before posting to the list.  So I just wanted to post a part of the
preparation first.

Thanks,
Namhyung


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