linux-kernel - [PATCH 2/2] perf test: Add perf record sample filtering test

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Message-ID: <20230811025822.3859771-2-namhyung@kernel.org>
Date:   Thu, 10 Aug 2023 19:58:22 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Subject: [PATCH 2/2] perf test: Add perf record sample filtering test

  $ sudo ./perf test 'sample filter' -v
   94: perf record sample filtering (by BPF) tests                     :
  --- start ---
  test child forked, pid 3817527
  Checking BPF-filter privilege
  Basic bpf-filter test
  Basic bpf-filter test [Success]
  Failing bpf-filter test
  Error: task-clock event does not have PERF_SAMPLE_CPU
  Failing bpf-filter test [Success]
  Group bpf-filter test
  Error: task-clock event does not have PERF_SAMPLE_CPU
  Error: task-clock event does not have PERF_SAMPLE_CODE_PAGE_SIZE
  Group bpf-filter test [Success]
  test child finished with 0
  ---- end ----
  perf record sample filtering (by BPF) tests: Ok

Cc: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/tests/shell/record_bpf_filter.sh | 128 ++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100755 tools/perf/tests/shell/record_bpf_filter.sh

diff --git a/tools/perf/tests/shell/record_bpf_filter.sh b/tools/perf/tests/shell/record_bpf_filter.sh
new file mode 100755
index 000000000000..e76ea861b92c
--- /dev/null
+++ b/tools/perf/tests/shell/record_bpf_filter.sh
@@ -0,0 +1,128 @@
+#!/bin/sh
+# perf record sample filtering (by BPF) tests
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+err=0
+perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+
+cleanup() {
+  rm -f "${perfdata}"
+  rm -f "${perfdata}".old
+  trap - EXIT TERM INT
+}
+
+trap_cleanup() {
+  cleanup
+  exit 1
+}
+trap trap_cleanup EXIT TERM INT
+
+test_bpf_filter_priv() {
+  echo "Checking BPF-filter privilege"
+
+  if [ "$(id -u)" != 0 ]
+  then
+    echo "bpf-filter test [Skipped permission]"
+    err=2
+    return
+  fi
+  if ! perf record -e task-clock --filter 'period > 1' \
+	  -o /dev/null --quiet true 2>&1
+  then
+    echo "bpf-filter test [Skipped missing BPF support]"
+    err=2
+    return
+  fi
+}
+
+test_bpf_filter_basic() {
+  echo "Basic bpf-filter test"
+
+  if ! perf record -e task-clock -c 10000 --filter 'ip < 0xffffffff00000000' \
+	  -o "${perfdata}" true 2> /dev/null
+  then
+    echo "Basic bpf-filter test [Failed record]"
+    err=1
+    return
+  fi
+  if perf script -i "${perfdata}" -F ip | grep 'ffffffff[0-9a-f]*'
+  then
+    echo "Basic bpf-filter test [Failed invalid output]"
+    err=1
+    return
+  fi
+  echo "Basic bpf-filter test [Success]"
+}
+
+test_bpf_filter_fail() {
+  echo "Failing bpf-filter test"
+
+  # 'cpu' requires PERF_SAMPLE_CPU flag
+  if ! perf record -e task-clock --filter 'cpu > 0' \
+	  -o /dev/null true 2>&1 | grep PERF_SAMPLE_CPU
+  then
+    echo "Failing bpf-filter test [Failed forbidden CPU]"
+    err=1
+    return
+  fi
+
+  if ! perf record --sample-cpu -e task-clock --filter 'cpu > 0' \
+	  -o /dev/null true 2>/dev/null
+  then
+    echo "Failing bpf-filter test [Failed should succeed]"
+    err=1
+    return
+  fi
+
+  echo "Failing bpf-filter test [Success]"
+}
+
+test_bpf_filter_group() {
+  echo "Group bpf-filter test"
+
+  if ! perf record -e task-clock --filter 'period > 1000 || ip > 0' \
+	  -o /dev/null true 2>/dev/null
+  then
+    echo "Group bpf-filter test [Failed should succeed]"
+    err=1
+    return
+  fi
+
+  if ! perf record -e task-clock --filter 'cpu > 0 || ip > 0' \
+	  -o /dev/null true 2>&1 | grep PERF_SAMPLE_CPU
+  then
+    echo "Group bpf-filter test [Failed forbidden CPU]"
+    err=1
+    return
+  fi
+
+  if ! perf record -e task-clock --filter 'period > 0 || code_pgsz > 4096' \
+	  -o /dev/null true 2>&1 | grep PERF_SAMPLE_CODE_PAGE_SIZE
+  then
+    echo "Group bpf-filter test [Failed forbidden CODE_PAGE_SIZE]"
+    err=1
+    return
+  fi
+
+  echo "Group bpf-filter test [Success]"
+}
+
+
+test_bpf_filter_priv
+
+if [ $err = 0 ]; then
+  test_bpf_filter_basic
+fi
+
+if [ $err = 0 ]; then
+  test_bpf_filter_fail
+fi
+
+if [ $err = 0 ]; then
+  test_bpf_filter_group
+fi
+
+cleanup
+exit $err
-- 
2.41.0.640.ga95def55d0-goog