linux-kernel - [PATCH 5/5] perf tools: Add pipe_test.sh to verify pipe operations

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Date:   Tue, 13 Jul 2021 17:34:42 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 5/5] perf tools: Add pipe_test.sh to verify pipe operations

It builds a test program and use it to verify pipe behavior with perf
record, inject and report.

  $ perf test pipe -v
  80: perf pipe recording and injection test                          :
  --- start ---
  test child forked, pid 1109301
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
     1109315  1109315       -1 |test.file.MGNff
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.153 MB /tmp/perf.data.dmsnlx (3995 samples) ]
      99.99%  test.file.MGNff  test.file.MGNffM  [.] noploop
  test child finished with 0
  ---- end ----
  perf pipe recording and injection test: Ok

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/tests/shell/pipe_test.sh | 69 +++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100755 tools/perf/tests/shell/pipe_test.sh

diff --git a/tools/perf/tests/shell/pipe_test.sh b/tools/perf/tests/shell/pipe_test.sh
new file mode 100755
index 000000000000..b6a89c6896c3
--- /dev/null
+++ b/tools/perf/tests/shell/pipe_test.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+# perf pipe recording and injection test
+# SPDX-License-Identifier: GPL-2.0
+
+# skip if there's no compiler
+if ! [ -x "$(command -v cc)" ]; then
+	echo "failed: no compiler, install gcc"
+	exit 2
+fi
+
+file=$(mktemp /tmp/test.file.XXXXXX)
+data=$(mktemp /tmp/perf.data.XXXXXX)
+
+cat <<EOF | cc -o ${file} -x c -
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+volatile int done;
+
+void sigalrm(int sig) {
+	done = 1;
+}
+
+__attribute__((noinline)) void noploop(void) {
+	while (!done)
+		continue;
+}
+
+int main(int argc, char *argv[]) {
+	int sec = 1;
+
+	if (argc > 1)
+		sec = atoi(argv[1]);
+
+	signal(SIGALRM, sigalrm);
+	alarm(sec);
+
+	noploop();
+	return 0;
+}
+EOF
+
+
+if ! perf record -e cycles:u -o - ${file} | perf report -i - --task | grep test.file; then
+	echo "cannot find the test file in the perf report"
+	exit 1
+fi
+
+if ! perf record -e cycles:u -o - ${file} | perf inject -b | perf report -i - | grep noploop; then
+	echo "cannot find noploop function in pipe #1"
+	exit 1
+fi
+
+perf record -e cycles:u -o - ${file} | perf inject -b -o ${data}
+if ! perf report -i ${data} | grep noploop; then
+	echo "cannot find noploop function in pipe #2"
+	exit 1
+fi
+
+perf record -e cycles:u -o ${data} ${file}
+if ! perf inject -b -i ${data} | perf report -i - | grep noploop; then
+	echo "cannot find noploop function in pipe #3"
+	exit 1
+fi
+
+
+rm -f ${file} ${data} ${data}.old
+exit 0
-- 
2.32.0.93.g670b81a890-goog