linux-kernel - Re: perf report --no-children chopping off tracepoint fields

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Message-ID: <CAM9d7chXJTcdJ+_WbmXVafUpsMpM7RPZ+vmwg2wkxQJsP8yT-w@mail.gmail.com>
Date:	Fri, 8 Apr 2016 00:43:53 -0700
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
	Wang Nan <wangnan0@...wei.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf report --no-children chopping off tracepoint fields

Hi Arnaldo,

On Thu, Apr 7, 2016 at 7:51 AM, Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
> Hi Namhyung,
>
>         If I do:
>
>   # perf record --call dwarf -p 2519 -e syscalls:sys_enter_open
>
> And then run plain 'perf report' I get this on the TUI, perfect:
>
>   Samples: 1  of event 'syscalls:sys_enter_open', Event count (approx.): 1
>   Children      Self  Trace output
> +  100.00%   100.00%  filename: 0x7efe0cc9a96a, flags: 0x00000000, mode: 0x7fffa3da07f0
>
> But if I use 'perf report --no-children' I get it chopped off at the
> start of the first tp arg value:
>
>  Samples: 1  of event 'syscalls:sys_enter_open', Event count (approx.): 1
>   Overhead  Trace output
> +  100.00%  filename: 0x
>
> :-\

Hmm.. I cannot reproduce the problem.  All (non-filtered) entries have
trace_output should calculate the column length in the output_resort()
-> hists__calc_col_len().

Btw it seems the --children is meaningless if symbol or dso sort keys
are not used.

Thanks,
Namhyung