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@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210719223153.1618812-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/tests/shell/pipe_test.sh b/tools/perf/tests/shell/pipe_test.sh
new file mode 100755 (executable)
index 0000000..1b32b4f
--- /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 task-clock: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 task-clock: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 task-clock: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 task-clock: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