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 <eran...@google.com>
Acked-by: Stephane Eranian <eran...@google.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
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 = perf_header__write_pipe(file->fd);
if (err < 0)
- goto out_delete_session;
+ goto out_child;
} else {
err = perf_session__write_header(session, rec->evlist,
file->fd, false);
if (err < 0)
- goto out_delete_session;
+ goto out_child;
}
if (!rec->no_buildid
@@ -421,7 +373,7 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
pr_err("Couldn't generate buildids. "
"Use --no-buildid to profile anyway.\n");
err = -1;
- goto out_delete_session;
+ goto out_child;
}
machine = &session->machines.host;
@@ -431,7 +383,7 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
process_synthesized_event);
if (err < 0) {
pr_err("Couldn't synthesize attrs.\n");
- goto out_delete_session;
+ goto out_child;
}
if (have_tracepoints(&rec->evlist->entries)) {
@@ -447,7 +399,7 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
process_synthesized_event);
if (err <= 0) {
pr_err("Couldn't record tracing data.\n");
- goto out_delete_session;
+ goto out_child;
}
rec->bytes_written += err;
}
@@ -475,7 +427,7 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
err = __machine__synthesize_threads(machine, tool, &opts->target,
rec->evlist->threads,
process_synthesized_event,
opts->sample_address);
if (err != 0)
- goto out_delete_session;
+ goto out_child;
if (rec->realtime_prio) {
struct sched_param param;
@@ -484,7 +436,7 @@ static int __cmd_record(struct record *rec, int argc, const
char **argv)
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
pr_err("Could not set realtime priority.\n");
err = -1;
- goto out_delete_session;
+ goto out_child;
}
}
@@ -512,13 +464,15 @@ static int __cmd_record(struct record *rec, int argc,
const char **argv)
if (record__mmap_read_all(rec) < 0) {
err = -1;
- goto out_delete_session;
+ goto out_child;
}
if (hits == rec->samples) {
if (done)
break;
err = poll(rec->evlist->pollfd, rec->evlist->nr_fds,
-1);
+ if (err < 0 && errno == EINTR)
+ err = 0;
waking++;
}
@@ -538,28 +492,52 @@ static int __cmd_record(struct record *rec, int argc,
const char **argv)
const char *emsg = strerror_r(workload_exec_errno, msg,
sizeof(msg));
pr_err("Workload failed: %s\n", emsg);
err = -1;
- goto out_delete_session;
+ goto out_child;
}
- if (quiet || signr == SIGUSR1)
- return 0;
+ if (!quiet) {
+ fprintf(stderr, "[ perf record: Woken up %ld times to write
data ]\n", waking);
- fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n",
waking);
+ /*
+ * Approximate RIP event size: 24 bytes.
+ */
+ fprintf(stderr,
+ "[ perf record: Captured and wrote %.3f MB %s (~%"
PRIu64 " samples) ]\n",
+ (double)rec->bytes_written / 1024.0 / 1024.0,
+ file->path,
+ rec->bytes_written / 24);
+ }
- /*
- * Approximate RIP event size: 24 bytes.
- */
- fprintf(stderr,
- "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 "
samples) ]\n",
- (double)rec->bytes_written / 1024.0 / 1024.0,
- file->path,
- rec->bytes_written / 24);
+out_child:
+ if (forks) {
+ int exit_status;
- return 0;
+ if (!child_finished)
+ kill(rec->evlist->workload.pid, SIGTERM);
+
+ wait(&exit_status);
+
+ if (err < 0)
+ status = err;
+ else if (WIFEXITED(exit_status))
+ status = WEXITSTATUS(exit_status);
+ else if (WIFSIGNALED(status))
+ psignal(WTERMSIG(status), rec->progname);
+ } else
+ status = err;
+
+ if (!err && !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);
+ }
out_delete_session:
perf_session__delete(session);
- return err;
+ return status;
}
#define BRANCH_OPT(n, m) \
@@ -988,6 +966,7 @@ int cmd_record(int argc, const char **argv, const char
*prefix __maybe_unused)
err = __cmd_record(&record, argc, argv);
out_symbol_exit:
+ perf_evlist__delete(rec->evlist);
symbol__exit();
return err;
}
--
1.9.2
--
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