linux-kernel - Re: [RFC 0/4] perf script python: Provide perf

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Date:   Tue, 18 Jul 2017 10:35:38 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arun Kalyanasundaram <arunkaly@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S . Miller" <davem@...emloft.net>,
        SeongJae Park <sj38.park@...il.com>, davidcc@...gle.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC 0/4] perf script python: Provide perf_sample dict to all
 handlers

On Mon, Jul 17, 2017 at 03:10:36PM -0700, Arun Kalyanasundaram wrote:
> The process_event python hook receives a dict with all perf_sample entries.
> 
> Other handlers (e.g. trace_unhandled, python_process_tracepoint) predate the introduction of this dict and do not receive it. This patch series adds the dict to all handlers, aiming to unify the information passed to them.
> 
> This change adds an additional argument to the affected handlers. To keep backwards compatibility (and avoid unnecessary work), do not pass the aforementioned dict if the number of arguments signals that handler version predates this change.
> 
> Initial Discussion: https://lkml.org/lkml/2017/7/1/108
> 
> Arun Kalyanasundaram (4):
>   perf script python: Allocate memory only if handler exists
>   perf script python: Refactor creation of perf sample dict
>   perf script python: Add perf_sample dict to tracepoint handlers
>   perf script python: Generate hooks with additional argument
> 
>  .../util/scripting-engines/trace-event-python.c    | 189 ++++++++++++++-------
>  1 file changed, 128 insertions(+), 61 deletions(-)

looks good, but any idea the perf-script.py output gives
some trash at the end of 'comm' args? like:

sched__sched_stat_runtime     1 199971.010182869    21999 perf                  comm=perf^@^@...6_64-l^@, pid=21999


thanks,
jirka