linux-kernel - Re: [PATCH 1/3] perf tools: Add data object to handle perf data file

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Date:	Wed, 16 Oct 2013 11:48:07 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 1/3] perf tools: Add data object to handle perf data file

Hi Jiri,

On Tue, 15 Oct 2013 16:27:32 +0200, Jiri Olsa wrote:
> This patch is adding 'struct perf_data_file' object as
> a placeholder for all attributes regarding perf.data
> file handling. Changing perf_session__new to take it
> as an argument.
>
> The rest of the functionality will be added later to keep
> this change simple enough, because all the places using
> perf_session are changed now.

All three look good.

Btw, are you planning to support multiple per-cpu file record?  As you
know I suggested perf.data.dir approach in my perf-ftrace patchset (I'll
resend a new version soonish) something like below.  What do you think?

  perf.data.dir/
    |-- perf-cpu0.data
    |-- perf-cpu1.data
    |-- perf-cpu2.data
    `-- perf-cpu3.data

Maybe we could split sample data and other data (e.g. COMM, MMAP or some
user data?) to another file(s).

Thanks,
Namhyung
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