perf stat: Use perf_evlist__prepare/start_workload()
The perf stat had an open code to the duplicated work. Use the helper
as it now can be called without struct perf_record_opts.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1362987798-24969-7-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 20ffaf9..69fe6ed 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -337,16 +337,14 @@
}
}
-static int __run_perf_stat(int argc __maybe_unused, const char **argv)
+static int __run_perf_stat(int argc, const char **argv)
{
char msg[512];
unsigned long long t0, t1;
struct perf_evsel *counter;
struct timespec ts;
int status = 0;
- int child_ready_pipe[2], go_pipe[2];
const bool forks = (argc > 0);
- char buf;
if (interval) {
ts.tv_sec = interval / 1000;
@@ -362,55 +360,12 @@
return -1;
}
- if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
- perror("failed to create pipes");
- return -1;
- }
-
if (forks) {
- if ((child_pid = fork()) < 0)
- perror("failed to fork");
-
- if (!child_pid) {
- close(child_ready_pipe[0]);
- close(go_pipe[1]);
- fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
-
- /*
- * Do a dummy execvp to get the PLT entry resolved,
- * so we avoid the resolver overhead on the real
- * execvp call.
- */
- execvp("", (char **)argv);
-
- /*
- * Tell the parent we're ready to go
- */
- close(child_ready_pipe[1]);
-
- /*
- * Wait until the parent tells us to go.
- */
- if (read(go_pipe[0], &buf, 1) == -1)
- perror("unable to read pipe");
-
- execvp(argv[0], (char **)argv);
-
- perror(argv[0]);
- exit(-1);
+ if (perf_evlist__prepare_workload(evsel_list, &target, argv,
+ false, false) < 0) {
+ perror("failed to prepare workload");
+ return -1;
}
-
- if (perf_target__none(&target))
- evsel_list->threads->map[0] = child_pid;
-
- /*
- * Wait for the child to be ready to exec.
- */
- close(child_ready_pipe[1]);
- close(go_pipe[0]);
- if (read(child_ready_pipe[0], &buf, 1) == -1)
- perror("unable to read pipe");
- close(child_ready_pipe[0]);
}
if (group)
@@ -457,7 +412,8 @@
clock_gettime(CLOCK_MONOTONIC, &ref_time);
if (forks) {
- close(go_pipe[1]);
+ perf_evlist__start_workload(evsel_list);
+
if (interval) {
while (!waitpid(child_pid, &status, WNOHANG)) {
nanosleep(&ts, NULL);