linux-kernel - Re: [PATCHSET 0/5] perf tools: Enhance option parsing error message

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Date:	Fri, 1 Nov 2013 08:38:11 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCHSET 0/5] perf tools: Enhance option parsing error message


* Namhyung Kim <namhyung@...nel.org> wrote:

> Hi,
> 
> This patchset tries to enhance error message when perf failed to parse
> option argument.  Currently it just shows entire usage and options
> which may fill two pages of screen.  It's hard for me to say it's
> really helpful to users. ;-)
> 
> With this patch series, it changed to show only related option(s).
> There're also more points to improve yet - like auto-breaking long
> lines, dealing with UIs and so on.  But I believe this will be a good
> start.
> 
>   $ perf report -g help
> 
>    usage: perf report [<options>]
> 
>       -g, --call-graph <output_type,min_percent[,print_limit],call_order>
>                           Display callchains using output_type (graph, flat, fractal, or none) , min percent threshold, optional print limit, callchain order, key (function or address). Default: fractal,0.5,callee,function
> 
>   $ perf stat -Bx, ls
>   -B option not supported with -x
> 
>    usage: perf stat [<options>] [<command>]
> 
>       -B, --big-num         print large numbers with thousands' separators
>       -x, --field-separator <separator>
>                             print counts with custom separator
> 
> 
> You can get this on 'perf/option-v1' branch in my tree
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

Cool!

Acked-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Enthusiastically-Supported-by: Ingo Molnar <mingo@...nel.org>
/me runs out of tags

Thanks!

	Ingo
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