linux-kernel - Re: [PATCH 1/4] perf tools: Split -g and --call-graph for record command

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Date:	Sun, 27 Oct 2013 09:30:06 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
CC:	Corey Ashford <cjashfor@...ux.vnet.ibm.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>,
	Andi Kleen <andi@...stfloor.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/4] perf tools: Split -g and --call-graph for record
 command

On 10/26/13 8:25 AM, Jiri Olsa wrote:
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index f10ab63..7be62770 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -92,8 +92,12 @@ OPTIONS
>   	size is rounded up to have nearest pages power of two value.
>
>   -g::
> +	Enables call-graph (stack chain/backtrace) recording.
> +
>   --call-graph::
> -	Do call-graph (stack chain/backtrace) recording.
> +	Setup and enable call-graph (stack chain/backtrace) recording,
> +	implies -g.
> +

This needs some more words as to why it is used over -g. It is also 
missing the options that can be given (fp or dwarf).

---8<---

> @@ -825,9 +851,12 @@ const struct option record_options[] = {
>   		     perf_evlist__parse_mmap_pages),
>   	OPT_BOOLEAN(0, "group", &record.opts.group,
>   		    "put the counters into a counter group"),
> -	OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
> -			     "mode[,dump_size]", record_callchain_help,
> -			     &record_parse_callchain_opt, "fp"),
> +	OPT_CALLBACK(0, "call-graph", &record.opts,
> +		     "mode[,dump_size]", record_callchain_help,
> +		     &record_parse_callchain_opt),
> +	OPT_CALLBACK_NOOPT('g', NULL, &record.opts,
> +			   NULL, "enables call-graph recording" ,
> +			   &record_callchain_opt),

 From a user/readability perspective I would prefer the order to be -g 
then --call-graph especially since --call-graph is like an advanced -g 
where you get more control over the method used.

Other than that:

Tested-Reviewed-by: David Ahern <dsahern@...il.com>

David

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