linux-kernel - Re: [PATCH v1 2/3] perf report: extend raw dump (-D) out with switch out event type

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Date:   Wed, 21 Mar 2018 17:41:48 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/3] perf report: extend raw dump (-D) out with switch
 out event type

On Tue, Mar 20, 2018 at 04:05:17PM +0300, Alexey Budankov wrote:
> Print additional 'yield' tag for PERF_RECORD_SWITCH[_CPU_WIDE] OUT records when
> event header misc field contains PERF_RECORD_MISC_SWITCH_OUT_YIELD bit set 
> designating synchronization context switch out event:
> 
> perf report -D -i system-wide.perf: 
> 
> 0x1b9c50 [0x30]: event: 15
> .
> . ... raw event: size 48 bytes
> .  0000:  0f 00 00 00 00 20 30 00 01 1e 00 00 01 1e 00 00  ..... 0.........
> .  0010:  00 00 00 00 00 00 00 00 85 ae d4 e3 3e 0e 00 00  ............>...
> .  0020:  54 00 00 00 00 00 00 00 05 00 00 00 00 00 00 00  T...............
> 
> 5 15663273127557 0x1b9c50 [0x30]: PERF_RECORD_SWITCH_CPU_WIDE OUT  next pid/tid:  7681/7681 
> 
> 0x2646c0 [0x30]: event: 15
> .
> . ... raw event: size 48 bytes
> .  0000:  0f 00 00 00 00 60 30 00 00 00 00 00 00 00 00 00  .....`0.........
> .  0010:  00 1e 00 00 00 1e 00 00 29 1e d5 e3 3e 0e 00 00  ........)...>...
> .  0020:  56 00 00 00 00 00 00 00 07 00 00 00 00 00 00 00  V...............
> 
> 7 15663273156137 0x2646c0 [0x30]: PERF_RECORD_SWITCH_CPU_WIDE OUT yield  next pid/tid:     0/0
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/util/event.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index f0a6cbd033cc..af5a85d56446 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -1421,7 +1421,9 @@ size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
>  size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
>  {
>  	bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
> -	const char *in_out = out ? "OUT" : "IN ";
> +	const char *in_out = !out ? "IN " :
> +		!(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_YIELD) ?
> +				"OUT" : "OUT yield";

I'm getting:

       rcu_sched     9 [004] Sy     1303.392349: PERF_RECORD_SWITCH_CPU_WIDE OUT yield  next pid/tid:     0/0
         swapper     0 [004]        1303.392350: PERF_RECORD_SWITCH_CPU_WIDE IN   prev pid/tid:     9/9

could you plase format the 'OUT yield' line so the rest of the
fields are in line with 'IN' and 'OUT' lines like:

       rcu_sched     9 [004] Sy     1303.392349: PERF_RECORD_SWITCH_CPU_WIDE OUT yield  next pid/tid:     0/0
         swapper     0 [004]        1303.392350: PERF_RECORD_SWITCH_CPU_WIDE IN         prev pid/tid:     9/9

thanks,
jirka