[PATCH v5 12/13] perf record: implement control commands handling

Alexey Budankov
2020-06-01T16:04:27Z

Implement handling of 'enable' and 'disable' control commands
coming from control file descriptor.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/builtin-record.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d0b29a1070a0..0394e068dde8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1527,6 +1527,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
bool disabled = false, draining = false;
int fd;
float ratio = 0;
+ enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;

atexit(record__sig_exit);
signal(SIGCHLD, sig_handler);
@@ -1830,6 +1831,21 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
alarm(rec->switch_output.time);
}

+ if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
+ switch (cmd) {
+ case EVLIST_CTL_CMD_ENABLE:
+ pr_info(EVLIST_ENABLED_MSG);
+ break;
+ case EVLIST_CTL_CMD_DISABLE:
+ pr_info(EVLIST_DISABLED_MSG);
+ break;
+ case EVLIST_CTL_CMD_ACK:
+ case EVLIST_CTL_CMD_UNSUPPORTED:
+ default:
+ break;
+ }
+ }
+
if (hits == rec->samples) {
if (done || draining)
break;
--
2.24.1