linux-kernel - Re: [PATCH] perf script: format regression due to libtraceevent

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Date:	Thu, 14 Jun 2012 14:42:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf script: format regression due to libtraceevent

On Thu, 2012-06-14 at 12:36 -0600, David Ahern wrote:
> Consider the commands:
>     perf record -e sched:sched_switch -fo /tmp/perf.data  -a -- sleep 1
>     perf script -i /tmp/perf.data
> 
> In v3.4 the output has the form (lines wrapped here)
>     perf 29214 [005] 821043.582596: sched_switch:
> prev_comm=perf prev_pid=29214 prev_prio=120
> prev_state=S ==> next_comm=swapper/5 next_pid=0 next_prio=120
> 
> In 3.5 that same line has become:
>     perf 29214 [005] 821043.582596: sched_switch:
> <...>-29214 [005]     0.000000000: sched_switch:
> prev_comm=perf prev_pid=29214 prev_prio=120
> prev_state=S ==> next_comm=swapper/5 next_pid=0 next_prio=120
> 
> Note the duplicates in the output -- pid, cpu, event name. With
> this patch the v3.4 output is restored:
>     perf 29214 [005] 821043.582596: sched_switch:
> prev_comm=perf prev_pid=29214 prev_prio=120
> prev_state=S ==> next_comm=swapper/5 next_pid=0 next_prio=120
> 
> v3:
> Remove that pesky newline too. Output now matches v3.4 (pre-libtracevent).
> 
> v2:
> Change print_trace_event function local to perf per Steve's comments.
> 
> CC: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> Cc: Namhyung Kim <namhyung@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  tools/perf/util/trace-event-parse.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
> index df2fddb..5dd3b5e 100644
> --- a/tools/perf/util/trace-event-parse.c
> +++ b/tools/perf/util/trace-event-parse.c
> @@ -198,9 +198,8 @@ void print_trace_event(int cpu, void *data, int size)
>  	record.data = data;
>  
>  	trace_seq_init(&s);
> -	pevent_print_event(pevent, &s, &record);
> +	pevent_event_info(&s, event, &record);
>  	trace_seq_do_printf(&s);
> -	printf("\n");
>  }
>  
>  void print_event(int cpu, void *data, int size, unsigned long long nsecs,


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