* perf report --no-children chopping off tracepoint fields
@ 2016-04-07 14:51 Arnaldo Carvalho de Melo
2016-04-08 7:43 ` Namhyung Kim
0 siblings, 1 reply; 2+ messages in thread
From: Arnaldo Carvalho de Melo @ 2016-04-07 14:51 UTC (permalink / raw)
To: Namhyung Kim
Cc: Jiri Olsa, David Ahern, Wang Nan, Adrian Hunter,
Linux Kernel Mailing List
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
:-\
- Arnaldo
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: perf report --no-children chopping off tracepoint fields
2016-04-07 14:51 perf report --no-children chopping off tracepoint fields Arnaldo Carvalho de Melo
@ 2016-04-08 7:43 ` Namhyung Kim
0 siblings, 0 replies; 2+ messages in thread
From: Namhyung Kim @ 2016-04-08 7:43 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Jiri Olsa, David Ahern, Wang Nan, Adrian Hunter,
Linux Kernel Mailing List
Hi Arnaldo,
On Thu, Apr 7, 2016 at 7:51 AM, Arnaldo Carvalho de Melo
<acme@kernel.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
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