perf tests: Spawn child for each test

In upcoming tests we will setup process limits, which
might affect other tests. Spawning child for each test
to prevent this.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1401892622-30848-11-git-send-email-jolsa@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 31 insertions, 1 deletions

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 802e3cd50f6f..9677a5c6a366 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -3,6 +3,8 @@
  *
  * Builtin regression testing command: ever growing number of sanity tests
  */
+#include <unistd.h>
+#include <string.h>
 #include "builtin.h"
 #include "intlist.h"
 #include "tests.h"
@@ -172,6 +174,34 @@ static bool perf_test__matches(int curr, int argc, const char *argv[])
         return false;
 }
 
+static int run_test(struct test *test)
+{
+        int status, err = -1, child = fork();
+
+        if (child < 0) {
+                pr_err("failed to fork test: %s\n", strerror(errno));
+                return -1;
+        }
+
+        if (!child) {
+                pr_debug("test child forked, pid %d\n", getpid());
+                err = test->func();
+                exit(err);
+        }
+
+        wait(&status);
+
+        if (WIFEXITED(status)) {
+                err = WEXITSTATUS(status);
+                pr_debug("test child finished with %d\n", err);
+        } else if (WIFSIGNALED(status)) {
+                err = -1;
+                pr_debug("test child interrupted\n");
+        }
+
+        return err;
+}
+
 static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
 {
         int i = 0;
@@ -200,7 +230,7 @@ static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist)
                 }
 
                 pr_debug("\n--- start ---\n");
-                err = tests[curr].func();
+                err = run_test(&tests[curr]);
                 pr_debug("---- end ----\n%s:", tests[curr].desc);
 
                 switch (err) {