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

From: Namhyung Kim
Date: Tue Jul 13 2021 - 20:34:57 EST


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@xxxxxxxxxx>
---
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