perf test: Replace record test workload with thloop

So that it can get rid of requirements for a compiler.

  $ sudo ./perf test -v 92
   92: perf record tests                                               :
  --- start ---
  test child forked, pid 740204
  Basic --per-thread mode test
  Basic --per-thread mode test [Success]
  Register capture test
  Register capture test [Success]
  Basic --system-wide mode test
  Basic --system-wide mode test [Success]
  Basic target workload test
  Basic target workload test [Success]
  test child finished with 0
  ---- end ----
  perf record tests: Ok

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: James Clark <james.clark@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221116233854.1596378-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/shell/record.sh

@@ -9,17 +9,13 @@ shelldir=$(dirname "$0")
 
 err=0
 perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
-testprog=$(mktemp /tmp/__perf_test.prog.XXXXXX)
+testprog="perf test -w thloop"
 testsym="test_loop"
 
 cleanup() {
   rm -rf "${perfdata}"
   rm -rf "${perfdata}".old
 
-  if [ "${testprog}" != "true" ]; then
-    rm -f "${testprog}"
-  fi
-
   trap - EXIT TERM INT
 }
 
@@ -29,53 +25,6 @@ trap_cleanup() {
 }
 trap trap_cleanup EXIT TERM INT
 
-build_test_program() {
-  if ! [ -x "$(command -v cc)" ]; then
-    # No CC found. Fall back to 'true'
-    testprog=true
-    testsym=true
-    return
-  fi
-
-  echo "Build a test program"
-  cat <<EOF | cc -o ${testprog} -xc - -pthread
-#include <stdio.h>
-#include <stdlib.h>
-#include <pthread.h>
-
-void test_loop(void) {
-  volatile int count = 1000000;
-
-  while (count--)
-    continue;
-}
-
-void *thfunc(void *arg) {
-  int forever = *(int *)arg;
-
-  do {
-    test_loop();
-  } while (forever);
-
-  return NULL;
-}
-
-int main(int argc, char *argv[]) {
-  pthread_t th;
-  int forever = 0;
-
-  if (argc > 1)
-    forever = atoi(argv[1]);
-
-  pthread_create(&th, NULL, thfunc, &forever);
-  test_loop();
-  pthread_join(th, NULL);
-
-  return 0;
-}
-EOF
-}
-
 test_per_thread() {
   echo "Basic --per-thread mode test"
   if ! perf record -o /dev/null --quiet ${testprog} 2> /dev/null
@@ -96,8 +45,8 @@ test_per_thread() {
     return
   fi
 
-  # run the test program in background (forever)
+  # run the test program in background (for 30 seconds)
-  ${testprog} 1 &
+  ${testprog} 30 &
   TESTPID=$!
 
   rm -f "${perfdata}"
@@ -205,8 +154,6 @@ test_workload() {
   echo "Basic target workload test [Success]"
 }
 
-build_test_program
-
 test_per_thread
 test_register_capture
 test_system_wide