[PATCH 5/3] perf report: Check attr.inherit_stat bit for --show-threads

[Namhyung Kim]

Check the evsel->attr.inherit_stat bit and show warning message if it's
missing and -T/--threads option was given:

  $ perf report -T
  Error: perf.data file has no per-thread stat data.
         Did you run 'perf record' with -s option?

Suggested-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/builtin-report.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 6ac2c7a01a63..ac2dc057cbc5 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -848,6 +848,19 @@ repeat:
 		      stdout);
 	}
 
+	if (report.show_threads) {
+		struct perf_evsel *evsel;
+
+		evlist__for_each(session->evlist, evsel) {
+			if (!evsel->attr.inherit_stat) {
+				pr_err("Error: %s file has no per-thread stat data.\n"
+				       "       Did you run 'perf record' with -s option?\n",
+					input_name);
+				goto error;
+			}
+		}
+	}
+
 	/*
 	 * Only in the TUI browser we are doing integrated annotation,
 	 * so don't allocate extra space that won't be used in the stdio
-- 
2.4.0

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