[PATCH 3/3] perf test: fix "trace summary" test for musl-based systems

[Martin Kaiser]

The trace summary test calls /bin/true and filters for open, read and
close events. These events are coming from shared library loads.

On a musl system, the loader and libc may point to the same file. true
needs only libc, no further shared libraries are loaded at startup. The
test fails since no open, read and close events are captured.

root@host:~# ldd /bin/true
	/lib/ld-musl-riscv64.so.1 (0x3fb8882000)
	libc.so => /lib/ld-musl-riscv64.so.1 (0x3fb8882000)

root@host:~# file /lib/ld-musl-riscv64.so.1
/lib/ld-musl-riscv64.so.1: symbolic link to /usr/lib/libc.so

root@host:~# strace -f /bin/true
execve("/bin/true", ["/bin/true", ...], ... /* 18 vars */) = 1
set_tid_address(0x3fa1f7bf70)           = 330
mprotect(0x2ad6b8e000, 12288, PROT_READ) = 0
exit_group(0)                           = ?
+++ exited with 0 +++

Run "ps --help" instead of "true". ps needs at least libprocps and we'll
get the events that are needed for the test.

Signed-off-by: Martin Kaiser <martin@xxxxxxxxx>
---
 tools/perf/tests/shell/trace_summary.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/trace_summary.sh b/tools/perf/tests/shell/trace_summary.sh
index 22e2651d5919..03be213bb7bf 100755
--- a/tools/perf/tests/shell/trace_summary.sh
+++ b/tools/perf/tests/shell/trace_summary.sh
@@ -14,7 +14,7 @@ OUTPUT=$(mktemp /tmp/perf_trace_test.XXXXX)
 
 test_perf_trace() {
     args=$1
-    workload="true"
+    workload="ps --help"
     search="^\s*(open|read|close).*[0-9]+%$"
 
     echo "testing: perf trace ${args} -- ${workload}"
-- 
2.43.7