[PATCH 02/12] perf test: Replace pipe test workload with noploop

[Namhyung Kim <namhyung@kernel.org>]

So that it can get rid of requirement of a compiler.
Also define and use more local symbols to ease future changes.

  $ sudo ./perf test -v pipe
   87: perf pipe recording and injection test                          :
  --- start ---
  test child forked, pid 748003
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      748014   748014       -1 |perf
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.83%  perf     perf                  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]
      99.85%  perf     perf                  [.] noploop
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.160 MB /tmp/perf.data.2XYPdw (4007 samples) ]
      99.83%  perf     perf                  [.] noploop
  test child finished with 0
  ---- end ----
  perf pipe recording and injection test: Ok

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/tests/shell/pipe_test.sh | 55 ++++++-----------------------
 1 file changed, 10 insertions(+), 45 deletions(-)

diff --git a/tools/perf/tests/shell/pipe_test.sh b/tools/perf/tests/shell/pipe_test.sh
index 1b32b4f28391..8dd115dd35a7 100755
--- a/tools/perf/tests/shell/pipe_test.sh
+++ b/tools/perf/tests/shell/pipe_test.sh
@@ -2,68 +2,33 @@
 # 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)
+prog="perf test -w noploop"
+task="perf"
+sym="noploop"
 
-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
+if ! perf record -e task-clock:u -o - ${prog} | perf report -i - --task | grep ${task}; 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
+if ! perf record -e task-clock:u -o - ${prog} | perf inject -b | perf report -i - | grep ${sym}; 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
+perf record -e task-clock:u -o - ${prog} | perf inject -b -o ${data}
+if ! perf report -i ${data} | grep ${sym}; 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
+perf record -e task-clock:u -o ${data} ${prog}
+if ! perf inject -b -i ${data} | perf report -i - | grep ${sym}; then
 	echo "cannot find noploop function in pipe #3"
 	exit 1
 fi
 
 
-rm -f ${file} ${data} ${data}.old
+rm -f ${data} ${data}.old
 exit 0
-- 
2.38.1.493.g58b659f92b-goog