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 <[email protected]>
> ---
> 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
