[PATCH v2 10/11] perf record: introduce --ctl-fd[-ack] options

[Alexey Budankov]

Introduce --ctl-fd[-ack] options to pass open file descriptors
numbers from command line.

Signed-off-by: Alexey Budankov <alexey.budankov@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-record.c | 9 +++++++++
 tools/perf/util/record.h    | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2278a3efc747..9cf738ff1cae 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1704,6 +1704,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		perf_evlist__start_workload(rec->evlist);
 	}
 
+	perf_evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack);
+
 	if (opts->initial_delay) {
 		pr_info(PERF_EVLIST__DISABLED_MSG);
 		if (opts->initial_delay > 0) {
@@ -1850,6 +1852,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		record__synthesize_workload(rec, true);
 
 out_child:
+	perf_evlist__finalize_ctlfd(rec->evlist);
 	record__mmap_read_all(rec, true);
 	record__aio_mmap_read_sync(rec);
 
@@ -2331,6 +2334,8 @@ static struct record record = {
 		},
 		.mmap_flush          = MMAP_FLUSH_DEFAULT,
 		.nr_threads_synthesize = 1,
+		.ctl_fd              = -1,
+		.ctl_fd_ack          = -1,
 	},
 	.tool = {
 		.sample		= process_sample_event,
@@ -2526,6 +2531,10 @@ static struct option __record_options[] = {
 	OPT_UINTEGER(0, "num-thread-synthesize",
 		     &record.opts.nr_threads_synthesize,
 		     "number of threads to run for event synthesis"),
+	OPT_INTEGER(0, "ctl-fd", &record.opts.ctl_fd,
+		    "Listen on fd descriptor for command to control measurement ('e': enable events, 'd': disable events)"),
+	OPT_INTEGER(0, "ctl-fd-ack", &record.opts.ctl_fd_ack,
+		    "Send control command completion ('a') to fd ack descriptor"),
 	OPT_END()
 };
 
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index 96a73bbd8cd4..da18aeca3623 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -69,6 +69,8 @@ struct record_opts {
 	int	      mmap_flush;
 	unsigned int  comp_level;
 	unsigned int  nr_threads_synthesize;
+	int	      ctl_fd;
+	int	      ctl_fd_ack;
 };
 
 extern const char * const *record_usage;
-- 
2.24.1