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

From: Alexey Budankov
Date: Mon Mar 12 2018 - 04:43:26 EST


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@xxxxxxxxxxxxxxx>
---
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";

if (event->header.type == PERF_RECORD_SWITCH)
return fprintf(fp, " %s\n", in_out);