[PATCH v2 13/14] perf test: Add test for per-thread mode

Test that per-thread mode works when the process migrates across CPUs
and that the decode happens in the correct order.

A TODO is left in for when support for decoding in order with Perf
records is added.

Signed-off-by: James Clark <[email protected]>
---
 tools/perf/tests/shell/coresight/per-thread.sh | 48 ++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/tools/perf/tests/shell/coresight/per-thread.sh b/tools/perf/tests/shell/coresight/per-thread.sh
new file mode 100755
index 000000000000..77d1ed3405a9
--- /dev/null
+++ b/tools/perf/tests/shell/coresight/per-thread.sh
@@ -0,0 +1,48 @@
+#!/bin/bash -e
+# CoreSight per-thread CPU attribution (exclusive)
+
+# SPDX-License-Identifier: GPL-2.0
+
+# If CoreSight is not available, skip the test
+perf list pmu | grep -q cs_etm || exit 2
+
+if ! tmpdir=$(mktemp -d /tmp/perf-cs-callchain-test.XXXXXX); then
+	echo "mktemp failed"
+	exit 1
+fi
+
+cleanup_files()
+{
+	rm -rf "$tmpdir"
+	trap - EXIT TERM INT
+}
+
+trap cleanup_files EXIT
+trap 'cleanup_files; exit 1' TERM INT
+
+echo "Recording..."
+perf record -o "$tmpdir/data" -e cs_etm//u --per-thread -- \
+	taskset --cpu-list 0 taskset --cpu-list 1 taskset --cpu-list 2 true > /dev/null 2>&1
+
+echo "Decoding..."
+perf script -i "$tmpdir/data" --itrace=b -F comm,cpu 2> /dev/null | \
+	grep -Eo '(taskset|true).*(\[[0-9]+\])' | \
+	uniq | tail -n 3 > "$tmpdir/script" 2>/dev/null
+
+# Check that the decode says it ran on CPU 0, 1, 2, in that order. TODO: The
+# correct result should be "taskset [0,1,2], true 2" but we don't decode trace
+# in order of the Perf events yet, so everything is associated with the last
+# exec.
+cat > "$tmpdir/expected" << EOF
+true [000]
+true [001]
+true [002]
+EOF
+
+if ! diff -q "$tmpdir/script" "$tmpdir/expected"; then
+	echo "FAIL: per-thread output doesn't match expected:"
+	cat "$tmpdir/script"
+	exit 1
+fi
+
+exit 0

-- 
2.43.0