integration test for PSI metrics in runc events

Signed-off-by: Daniel Dao <dqminh89@gmail.com>

tests/integration/events.bats

@@ -26,6 +26,31 @@ function teardown() {
 	[[ "${lines[0]}" == *"data"* ]]
 }
 
+@test "events --stats with psi data" {
+	requires root cgroups_v2 psi
+	init_cgroup_paths
+
+	update_config '.linux.resources.cpu |= { "quota": 1000 }'
+
+	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
+	[ "$status" -eq 0 ]
+
+	# stress the cpu a little bit
+	runc exec test_busybox dd if=/dev/zero bs=1M count=5 of=/dev/null
+	[ "$status" -eq 0 ]
+
+	runc events --stats test_busybox
+	[ "$status" -eq 0 ]
+	# fetch stats to see PSI metrics
+	for psi_type in some full; do
+		for psi_metric in avg10 avg60 avg300 total; do
+			[[ "$(echo "${lines[0]}" | jq .data.cpu.psi.$psi_type.$psi_metric)" != "" ]]
+		done
+	done
+	# total must have been more than 0
+	[[ "$(echo "${lines[0]}" | jq .data.cpu.psi.some.total)" != "0" ]]
+}
+
 function test_events() {
 	# XXX: currently cgroups require root containers.
 	requires root

tests/integration/helpers.bash

@@ -448,6 +448,13 @@ function requires() {
 				skip_me=1
 			fi
 			;;
+		psi)
+			# If PSI is not compiled in the kernel, the file will not exist.
+			# If PIS is compiled, but not enable, read will fail with ENOSUPP
+			if [[ ! $(cat /sys/fs/cgroup/cpu.pressure) ]]; then
+				skip_me=1
+			fi
+			;;
 		*)
 			fail "BUG: Invalid requires $var."
 			;;