linux-kernel - Re: [PATCH 15/23] perf tools: Add perf data version 3 header read

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Date:	Fri, 19 Jul 2013 21:11:39 +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>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 15/23] perf tools: Add perf data version 3 header read

On Wed, 17 Jul 2013 19:49:55 +0200, Jiri Olsa wrote:
> Adding perf data version 3 header read code to load
> data for v3 format.
>
[SNIP]
> +
> +	session = container_of(header, struct perf_session, header);
> +	if (session->evlist)
> +		return 0;

I guess we need version check here.  The v2 format still needs to
process it even though it's session already has a evlist, right?

Thanks,
Namhyung

>  
>  	evlist = read_event_desc(header, fd);
>  	if (!evlist)
> -		return 0;
> +		return -1;
>  
> -	session = container_of(header, struct perf_session, header);
> +	ph = &session->header;
>  
> -	list_for_each_entry(evsel, &evlist->entries, node)
> -		perf_evlist__set_event_name(session->evlist, evsel);
> +	if (ph->version <= PERF_HEADER_VERSION_2) {
> +		list_for_each_entry(evsel, &evlist->entries, node)
> +			perf_evlist__set_event_name(session->evlist, evsel);
> +
> +		perf_evlist__delete(evlist);
> +	} else {
> +		session->evlist = evlist;
> +		symbol_conf.nr_events = evlist->nr_entries;
> +	}
>  
> -	perf_evlist__delete(evlist);
>  	return 0;
>  }
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