Re: [PATCHv2 0/3] perf tools: Add support for user defined metric

[kajoljain <kjain@linux.ibm.com>]

On 4/21/20 11:43 PM, Jiri Olsa wrote:
> hi,
> Joe asked for possibility to add user defined metrics. Given that
> we already have metrics support, I added --metrics-file option that
> allows to specify custom metrics.
> 
>   $ cat metrics
>   # IPC
>   mine1 = instructions / cycles;
>   /* DECODED_ICACHE_UOPS% */
>   mine2 = 100 * (idq.dsb_uops / \ (idq.ms_uops + idq.mite_uops + idq.dsb_uops + lsd.uops));
> 
>   $ sudo perf stat --metrics-file ./metrics -M mine1,mine2 --metric-only -a -I 1000
>   #           time       insn per cycle                mine1                mine2
>        1.000536263                0.71                   0.7                 41.4
>        2.002069025                0.31                   0.3                 14.1
>        3.003427684                0.27                   0.3                 14.8
>        4.004807132                0.25                   0.2                 12.1
>   ...
> 
> v2 changes:
>   - add new --metrics-file option
>   - rebased on current perf/core expression bison/flex enhancements
> 
> Also available in:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/metric
> 
> thanks,
> jirka
> 
> 
> ---
> Jiri Olsa (3):
>       perf expr: Add parsing support for multiple expressions
>       perf expr: Allow comments in custom metric file
>       perf stat: Add --metrics-file option

Hi Jiri,
     I try to look into these patches. As far as I understand we are using
syntax "Name: Expression" for user defined events. It will be great if we mention
this format somewhere for users.

Otherwise it works fine for me. Try by testing it for different metric expressions.
But still curious about reason for adding this support. Isn't json file is there for same purpose?

Thanks,
Kajol Jain
> 
>  tools/perf/Documentation/perf-stat.txt |  3 +++
>  tools/perf/builtin-stat.c              |  7 +++++--
>  tools/perf/tests/expr.c                | 13 +++++++++++++
>  tools/perf/util/expr.c                 |  6 ++++++
>  tools/perf/util/expr.h                 | 19 +++++++++++++++++--
>  tools/perf/util/expr.l                 | 24 ++++++++++++++++++++++++
>  tools/perf/util/expr.y                 | 13 ++++++++++++-
>  tools/perf/util/metricgroup.c          | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
>  tools/perf/util/metricgroup.h          |  3 ++-
>  tools/perf/util/stat.h                 |  1 +
>  10 files changed, 142 insertions(+), 13 deletions(-)
>