linux-kernel - Re: [PATCH V2 08/13] perf tools: show kernel overhead

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Date:   Tue, 6 Dec 2016 12:16:15 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     kan.liang@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
        tglx@...utronix.de, namhyung@...nel.org, jolsa@...nel.org,
        adrian.hunter@...el.com, wangnan0@...wei.com, mark.rutland@....com,
        andi@...stfloor.org
Subject: Re: [PATCH V2 08/13] perf tools: show kernel overhead

On Fri, Dec 02, 2016 at 04:19:16PM -0500, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> The kernel overhead include sample overhead, multiplexing overhead and
> side-band events overhead. All the information is printed in the head of
> output file if the show profiling cost option is applied.
> The result is sorted by CPU. If there is no available CPU information in
> sample, using -1 instead.
> 
> Output when CPU is available
>  # To display the perf.data header info, please use
>  --header/--header-only options.
>  #
>  # ========
>  # CPU       SAM    SAM cost(ns)       MUX    MUX cost(ns)        SB
>  SB cost(ns)
>  #   0    2261446     1991216491     122174     1128716680          0

- please make this output properly alligned
- it'd be nice to see some 1000 delimitiers
- do we need to display the rest of the perf output,
  it seems too much to me already

thanks,
jirka