linux-kernel - Re: [PATCH 1/4] perf tools: Improve ambiguous option help message

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Date:	Sun, 25 Oct 2015 09:48:35 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 1/4] perf tools: Improve ambiguous option help message


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

> Currently if an option name is ambiguous it only prints first two
> matched option names but no help.  It'd be better it could show all
> possible names and help messages too.
> 
> Before:
>   $ perf report --show
>     Error: Ambiguous option: show (could be --show-total-period or
>                                             --show-ref-call-graph)
>    Usage: perf report [<options>]
> 
> After:
>   $ perf report --show
>     Error: Ambiguous option: show (could be --show-total-period or
>                                             --show-ref-call-graph)
>    Usage: perf report [<options>]
> 
>       -n, --show-nr-samples
>                               Show a column with the number of samples
>           --showcpuutilization
>                               Show sample percentage for different cpu modes
>       -I, --show-info         Display extended information about perf.data file
>           --show-total-period
>                               Show a column with the sum of periods
>           --show-ref-call-graph
>                               Show callgraph from reference event

Very nice touch!

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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