Currently perf record doesn't propagate the exit status of a workload
given by the command line. But sometimes it'd useful if it's
propagated so that a monitoring script can handle errors
appropriately.
To do that, it got rid of exit handlers and run/call them directly in
the __cmd_record(). I don't see any reason why those are in a form of
exit handlers in the first place. Also it cleaned up the resource
management code in record__exit().
With this change, perf record returns the child exit status in case of
normal termination. (Not sure what should be returned on abnormal
cases though).
Example run of Stephane's case:
$ perf record true && echo yes || echo no
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.013 MB perf.data (~589 samples) ]
yes
$ perf record false && echo yes || echo no
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.013 MB perf.data (~589 samples) ]
no
And Jiri's case (error in parent):
$ perf record -m 10G true && echo yes || echo no
rounding mmap pages size to 17179869184 bytes (4194304 pages)
failed to mmap with 12 (Cannot allocate memory)
no
Reported-by: Stephane Eranian
Acked-by: Stephane Eranian
Signed-off-by: Namhyung Kim
---
tools/perf/builtin-record.c | 127 ++--
1 file changed, 53 insertions(+), 74 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8ce62ef7f6c3..e4cb53397b83 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -140,7 +140,6 @@ out:
}
static volatile int done = 0;
-static volatile int signr = -1;
static volatile int child_finished = 0;
static void sig_handler(int sig)
@@ -149,27 +148,6 @@ static void sig_handler(int sig)
child_finished = 1;
done = 1;
- signr = sig;
-}
-
-static void record__sig_exit(int exit_status __maybe_unused, void *arg)
-{
- struct record *rec = arg;
- int status;
-
- if (rec->evlist->workload.pid > 0) {
- if (!child_finished)
- kill(rec->evlist->workload.pid, SIGTERM);
-
- wait(&status);
- if (WIFSIGNALED(status))
- psignal(WTERMSIG(status), rec->progname);
- }
-
- if (signr == -1 || signr == SIGUSR1)
- return;
-
- signal(signr, SIG_DFL);
}
static int record__open(struct record *rec)
@@ -243,27 +221,6 @@ static int process_buildids(struct record *rec)
size,
&build_id__mark_dso_hit_ops);
}
-static void record__exit(int status, void *arg)
-{
- struct record *rec = arg;
- struct perf_data_file *file = &rec->file;
-
- if (status != 0)
- return;
-
- if (!file->is_pipe) {
- rec->session->header.data_size += rec->bytes_written;
-
- if (!rec->no_buildid)
- process_buildids(rec);
- perf_session__write_header(rec->session, rec->evlist,
- file->fd, true);
- perf_session__delete(rec->session);
- perf_evlist__delete(rec->evlist);
- symbol__exit();
- }
-}
-
static void perf_event__synthesize_guest_os(struct machine *machine, void
*data)
{
int err;
@@ -344,18 +301,19 @@ static volatile int workload_exec_errno;
* if the fork fails, since we asked by setting its
* want_signal to true.
*/
-static void workload_exec_failed_signal(int signo, siginfo_t *info,
+static void workload_exec_failed_signal(int signo __maybe_unused,
+ siginfo_t *info,
void *ucontext __maybe_unused)
{
workload_exec_errno = info->si_value.sival_int;
done = 1;
- signr = signo;
child_finished = 1;
}
static int __cmd_record(struct record *rec, int argc, const char **argv)
{
int err;
+ int status = 0;
unsigned long waking = 0;
const bool forks = argc > 0;
struct machine *machine;
@@ -367,7 +325,6 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
rec->progname = argv[0];
- on_exit(record__sig_exit, rec);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
@@ -394,26 +351,21 @@ static int __cmd_record(struct record *rec, int argc,
const char **argv)
if (record__open(rec) != 0) {
err = -1;
- goto out_delete_session;
+ goto out_child;
}
if (!rec->evlist->nr_groups)
perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
- /*
-* perf_session__delete(session) will be called at record__exit()
-*/
- on_exit(record__exit, rec);
-
if (file->is_pipe) {
err = p
