linux-kernel - Re: [PATCH 03/13] perf annotate: Move session handling out of __cmd

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Message-ID: <20140813114822.GD2370@krava.brq.redhat.com>
Date:	Wed, 13 Aug 2014 13:48:22 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 03/13] perf annotate: Move session handling out of
 __cmd_annotate()

On Tue, Aug 12, 2014 at 03:40:35PM +0900, Namhyung Kim wrote:

SNIP

>  
> @@ -301,6 +281,10 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
>  			.ordering_requires_timestamps = true,
>  		},
>  	};
> +	struct perf_data_file file = {
> +		.path  = input_name,
> +		.mode  = PERF_DATA_MODE_READ,
> +	};
>  	const struct option options[] = {
>  	OPT_STRING('i', "input", &input_name, "file",
>  		    "input file name"),
> @@ -308,7 +292,7 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
>  		   "only consider symbols in these dsos"),
>  	OPT_STRING('s', "symbol", &annotate.sym_hist_filter, "symbol",
>  		    "symbol to annotate"),
> -	OPT_BOOLEAN('f', "force", &annotate.force, "don't complain, do it"),
> +	OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
>  	OPT_INCR('v', "verbose", &verbose,
>  		    "be more verbose (show symbol address, etc)"),
>  	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
> @@ -341,6 +325,7 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
>  		    "Show event group information together"),
>  	OPT_END()
>  	};
> +	int ret;
>  
>  	argc = parse_options(argc, argv, options, annotate_usage, 0);
>  
> @@ -353,11 +338,16 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
>  
>  	setup_browser(true);
>  
> +	annotate.session = perf_session__new(&file, false, &annotate.tool);
> +	if (annotate.session == NULL)
> +		return -ENOMEM;

I know you're just moving code, but perf_session__new could
fail for more reasons than just ENOMEM, which is the most
unlikely case ;-) -1 is probably better option here

jirka
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