linux-kernel - [PATCH v2 2/2] perf test: Add sched latency and script shell tests

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Message-ID: <20250619002034.97007-2-irogers@google.com>
Date: Wed, 18 Jun 2025 17:20:34 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v2 2/2] perf test: Add sched latency and script shell tests

Add shell tests covering the `perf sched latency` and `perf sched
script` commands. The test creates 2 noploop processes on the same
forced CPU, it then checks that the process appears in the `perf
sched` output.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
v2: Skip the test if not root due to permissions.
---
 tools/perf/tests/shell/sched.sh | 91 +++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 tools/perf/tests/shell/sched.sh

diff --git a/tools/perf/tests/shell/sched.sh b/tools/perf/tests/shell/sched.sh
new file mode 100755
index 000000000000..0a4fe3f414e1
--- /dev/null
+++ b/tools/perf/tests/shell/sched.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+# perf sched tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+if [ "$(id -u)" != 0 ]; then
+  echo "[Skip] No root permission"
+  exit 2
+fi
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test_sched.perf.data.XXXXX)
+PID1=0
+PID2=0
+
+cleanup() {
+  rm -f "${perfdata}"
+  rm -f "${perfdata}".old
+
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  echo "Unexpected signal in ${FUNCNAME[1]}"
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+start_noploops() {
+  # Start two noploop workloads on CPU0 to trigger scheduling.
+  taskset -c 0 perf test -w noploop 10 &
+  PID1=$!
+  taskset -c 0 perf test -w noploop 10 &
+  PID2=$!
+
+  if ! grep -q 'Cpus_allowed_list:\s*0$' "/proc/$PID1/status"
+  then
+    echo "Sched [Error taskset did not work for the 1st noploop ($PID1)]"
+    grep Cpus_allowed /proc/$PID1/status
+    err=1
+  fi
+
+  if ! grep -q 'Cpus_allowed_list:\s*0$' "/proc/$PID2/status"
+  then
+    echo "Sched [Error taskset did not work for the 2nd noploop ($PID2)]"
+    grep Cpus_allowed /proc/$PID2/status
+    err=1
+  fi
+}
+
+cleanup_noploops() {
+  kill "$PID1" "$PID2"
+}
+
+test_sched_latency() {
+  echo "Sched latency"
+
+  start_noploops
+
+  perf sched record --no-inherit -o "${perfdata}" sleep 1
+  if ! perf sched latency -i "${perfdata}" | grep -q perf-noploop
+  then
+    echo "Sched latency [Failed missing output]"
+    err=1
+  fi
+
+  cleanup_noploops
+}
+
+test_sched_script() {
+  echo "Sched script"
+
+  start_noploops
+
+  perf sched record --no-inherit -o "${perfdata}" sleep 1
+  if ! perf sched script -i "${perfdata}" | grep -q perf-noploop
+  then
+    echo "Sched script [Failed missing output]"
+    err=1
+  fi
+
+  cleanup_noploops
+}
+
+test_sched_latency
+test_sched_script
+
+cleanup
+exit $err
-- 
2.50.0.rc2.701.gf1e915cc24-goog