linux-kernel - Re: [PATCH RFC 1/1] perf,tool: partial callgrap and time support

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Date:	Tue, 30 Jun 2015 14:31:17 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, namhyung@...nel.org, jolsa@...nel.org,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/1] perf,tool: partial callgrap and time support

On Sun, Jun 28, 2015 at 01:47:21PM -0400, kan.liang@...el.com wrote:

SNIP

> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
>  tools/perf/Documentation/perf-record.txt | 13 ++++++++
>  tools/perf/builtin-record.c              |  7 ++--
>  tools/perf/perf.h                        |  2 ++
>  tools/perf/util/evsel.c                  | 55 ++++++++++++++++++++++++++++++--
>  tools/perf/util/parse-events.c           | 33 +++++++++++++++++++
>  tools/perf/util/parse-events.h           |  3 ++
>  tools/perf/util/parse-events.l           |  3 ++
>  tools/perf/util/parse-options.c          |  2 ++
>  tools/perf/util/parse-options.h          |  4 +++
>  9 files changed, 116 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
> index 9b9d9d0..f945b01 100644
> --- a/tools/perf/Documentation/perf-record.txt
> +++ b/tools/perf/Documentation/perf-record.txt
> @@ -45,6 +45,19 @@ OPTIONS
>            param1 and param2 are defined as formats for the PMU in:
>            /sys/bus/event_sources/devices/<pmu>/format/*
>  
> +          There are also some params which are not defined in .../<pmu>/format/*.
> +          These params can be used to set event defaults.
> +          Here is a list of the params.
> +          - 'period': Set event sampling period
> +          - 'callgraph': Disable/enable callgraph. Acceptable values are
> +                         1 for FP mode, 2 for dwarf mode, 3 for LBR mode,
> +                         0 for disabling callgraph.

why dont use strings like 'fp,dwarf,lbr' to identify callchains?
you'd have:

  '{cpu/cpu-cycles,callgraph=fp,time=1,period=100000/,

also you dont need to assign 1 to time, it's the default, so this is equal:

  '{cpu/cpu-cycles,callgraph=fp,time,period=100000/,

come to that, 'fp' could be default for callgraph, like:

  '{cpu/cpu-cycles,callgraph,time,period=100000/,

we already have string terms translation support
in pmu_config_term.. but I guess this is not pmu specific
and can stay in config_term

also please add appropriate tests to tests/parse-events.c

thanks,
jirka
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