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

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Date:   Thu, 22 Mar 2018 19:13:01 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 2/3] perf report: extend raw dump (-D) out with switch out
 event type


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 <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..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);