[PATCH] perf data: Prefer sampled CPU when exporting JSON

[Shawn M. Chapla]

When CPU has been explicitly sampled (via --sample-cpu), prefer this
sampled value over the thread CPU value when exporting to JSON.

Signed-off-by: Shawn M. Chapla <schapla@xxxxxxxxxxxxxxx>
---
 tools/perf/util/data-convert-json.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/data-convert-json.c b/tools/perf/util/data-convert-json.c
index f1ab6edba446..613d6ae82663 100644
--- a/tools/perf/util/data-convert-json.c
+++ b/tools/perf/util/data-convert-json.c
@@ -149,6 +149,7 @@ static int process_sample_event(struct perf_tool *tool,
 	struct convert_json *c = container_of(tool, struct convert_json, tool);
 	FILE *out = c->out;
 	struct addr_location al, tal;
+	u64 sample_type = __evlist__combined_sample_type(evsel->evlist);
 	u8 cpumode = PERF_RECORD_MISC_USER;
 
 	if (machine__resolve(machine, &al, sample) < 0) {
@@ -168,7 +169,9 @@ static int process_sample_event(struct perf_tool *tool,
 	output_json_key_format(out, true, 3, "pid", "%i", al.thread->pid_);
 	output_json_key_format(out, true, 3, "tid", "%i", al.thread->tid);
 
-	if (al.thread->cpu >= 0)
+	if ((sample_type & PERF_SAMPLE_CPU))
+		output_json_key_format(out, true, 3, "cpu", "%i", sample->cpu);
+	else if (al.thread->cpu >= 0)
 		output_json_key_format(out, true, 3, "cpu", "%i", al.thread->cpu);
 
 	output_json_key_string(out, true, 3, "comm", thread__comm_str(al.thread));
-- 
2.36.1