linux-kernel - Re: [PATCHv2 4/5] perf stat: Add -a as a default target

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Date:   Mon, 20 Feb 2017 08:13:00 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCHv2 4/5] perf stat: Add -a as a default target

On Sat, Feb 18, 2017 at 06:52:25PM +0100, Borislav Petkov wrote:
> On Fri, Feb 17, 2017 at 06:48:13PM +0100, Boris Petkov wrote:
> > LGTM.
> > 
> > Acked-by: me
> 
> Well, it looks good but actually trying it is a different story. For
> example:
> 
> $ ./perf stat -e amd_nb/event=0xe0,umask=0x1f/ sleep 1
> 
> still says <not supported> because argc is not 0.
> 
> So how about the below diff instead?
> 
> $ ./perf stat -e amd_nb/event=0xe0,umask=0x1f/
> 
> without args dumps the usage message and
> 
> $ ./perf stat -e amd_nb/event=0xe0,umask=0x1f/ sleep 1
> 
> actually does the system-wide thing:
> 
>  Performance counter stats for 'system wide':
> 
>            196,469      amd_nb/event=0xe0,umask=0x1f/
> 
>        1.001815180 seconds time elapsed
> 
> Hmmm?

ugh, I thought it was too easy ;-)

it looks good to me

thanks,
jirka