linux-kernel - [PATCH v6 6/7] perf test: Add test case for record sideband events

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Date:   Mon, 21 Aug 2023 01:27:33 +0000
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
        <james.clark@....com>, <tmricht@...ux.ibm.com>,
        <ak@...ux.intel.com>, <anshuman.khandual@....com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH v6 6/7] perf test: Add test case for record sideband events

Add a new test case to record sideband events for all CPUs when tracing
selected CPUs

Test result:

  # ./perf test list 2>&1 | grep 'perf record sideband tests'
   95: perf record sideband tests
  # ./perf test 95
   95: perf record sideband tests                                      : Ok

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
Tested-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/tests/shell/record_sideband.sh | 44 +++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100755 tools/perf/tests/shell/record_sideband.sh

diff --git a/tools/perf/tests/shell/record_sideband.sh b/tools/perf/tests/shell/record_sideband.sh
new file mode 100755
index 000000000000..2ecf00011cb1
--- /dev/null
+++ b/tools/perf/tests/shell/record_sideband.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# perf record sideband tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+
+can_cpu_wide()
+{
+    if ! perf record -o ${perfdata} -BN --no-bpf-event -C $1 true 2>&1 >/dev/null
+    then
+        echo "record sideband test [Skipped cannot record cpu$1]"
+        err=2
+    fi
+
+    rm -f ${perfdata}
+    return $err
+}
+
+test_system_wide_tracking()
+{
+    # Need CPU 0 and CPU 1
+    can_cpu_wide 0 || return 0
+    can_cpu_wide 1 || return 0
+
+    # Record on CPU 0 a task running on CPU 1
+    perf record -BN --no-bpf-event -o ${perfdata} -C 0 -- taskset --cpu-list 1 true
+
+    # Should get MMAP events from CPU 1
+    mmap_cnt=`perf script -i ${perfdata} --show-mmap-events -C 1 2>/dev/null | grep MMAP | wc -l`
+
+    rm -f ${perfdata}
+
+    if [ ${mmap_cnt} -gt 0 ] ; then
+        return 0
+    fi
+
+    echo "Failed to record MMAP events on CPU 1 when tracing CPU 0"
+    return 1
+}
+
+test_system_wide_tracking
-- 
2.30.GIT