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 | grep _SWITCH: 1 113807080924003 0x26db26 [0x28]: PERF_RECORD_SWITCH_CPU_WIDE OUT next pid/tid: 20495/20495 1 113807080925644 0x26db4e [0x28]: PERF_RECORD_SWITCH_CPU_WIDE IN prev pid/tid: 31479/31479 1 113807080937266 0x26db76 [0x28]: PERF_RECORD_SWITCH_CPU_WIDE OUT yield next pid/tid: 16/16 1 113807080938445 0x26db9e [0x28]: PERF_RECORD_SWITCH_CPU_WIDE IN prev pid/tid: 20495/20495 1 113807080945455 0x26dbc6 [0x28]: PERF_RECORD_SWITCH_CPU_WIDE OUT yield next pid/tid: 20495/20495 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..324f44f02e66 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"; if (event->header.type == PERF_RECORD_SWITCH) return fprintf(fp, " %s\n", in_out);
