[PATCH v5 13/13] perf record: introduce --ctl-fd[-ack] options

Alexey Budankov
2020-06-01T16:05:11Z

Introduce --ctl-fd[-ack] options to pass open file descriptors numbers
from command line. Extend perf-record.txt file with --ctl-fd[-ack]
options description. Document possible usage model introduced by
--ctl-fd[-ack] options by providing example bash shell script.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/builtin-record.c | 6 ++++++
tools/perf/util/record.h | 2 ++
2 files changed, 8 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 0394e068dde8..fbe5069eb5d7 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1749,6 +1749,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
perf_evlist__start_workload(rec->evlist);
}

+ if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
+ goto out_child;
+
if (opts->initial_delay) {
pr_info(EVLIST_DISABLED_MSG);
if (opts->initial_delay > 0) {
@@ -1895,6 +1898,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
record__synthesize_workload(rec, true);

out_child:
+ evlist__finalize_ctlfd(rec->evlist);
record__mmap_read_all(rec, true);
record__aio_mmap_read_sync(rec);

@@ -2380,6 +2384,8 @@ 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,
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index da138dcb4d34..4cb72a478af1 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -70,6 +70,8 @@ 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