linux-kernel - Re: [PATCH] perf tools: Handle PERF_RECORD_HEADER_EVENT

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Message-ID: <20140205055552.GD30094@gmail.com>
Date:	Wed, 5 Feb 2014 06:55:52 +0100
From:	Ingo Molnar <mingo@...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>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH] perf tools: Handle PERF_RECORD_HEADER_EVENT_TYPE properly


* Jiri Olsa <jolsa@...hat.com> wrote:

> We removed event types from data file in following commits:
>   6065210 perf tools: Remove event types framework completely
>   44b3c57 perf tools: Remove event types from perf data file
> 
> We no longer need this information, because we can get it
> directly from tracepoints.
> 
> But we still need to handle PERF_RECORD_HEADER_EVENT_TYPE
> event for the sake of old perf data files created in pipe
> mode like:
> 
>   $ perf.3.4 record -o - foo >perf.data
>   $ perf.312 report -i - < perf.data
> 
> Reported-by: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: David Ahern <dsahern@...il.com>
> ---
>  tools/perf/util/session.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 0b39a48..5da6ce7 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1008,6 +1008,12 @@ static int perf_session__process_user_event(struct perf_session *session, union
>  		if (err == 0)
>  			perf_session__set_id_hdr_size(session);
>  		return err;
> +	case PERF_RECORD_HEADER_EVENT_TYPE:
> +		/*
> +		 * Depreceated, but we need to handle it for sake
> +		 * of old data files create in pipe mode.
> +		 */

Two small speling nits:

 s/Depreceated
  /Deprecated

 s/create
  /created

Ack otherwise.

Thanks,

	Ingo
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