[PATCH v2 09/11] perf record: implement control commands handling

[Alexey Budankov]

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

Signed-off-by: Alexey Budankov <alexey.budan...@linux.intel.com>
---
 tools/perf/builtin-record.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8a14e68b86ad..2278a3efc747 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1496,6 +1496,7 @@ 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 = CTL_CMD_UNSUPPORTED;
 
        atexit(record__sig_exit);
        signal(SIGCHLD, sig_handler);
@@ -1793,8 +1794,23 @@ static int __cmd_record(struct record *rec, int argc, 
const char **argv)
                         * Propagate error, only if there's any. Ignore positive
                         * number of returned events and interrupt error.
                         */
-                       if (err > 0 || (err < 0 && errno == EINTR))
+                       if (err > 0 || (err < 0 && errno == EINTR)) {
                                err = 0;
+                               if (perf_evlist__ctlfd_process(rec->evlist, 
&cmd) > 0) {
+                                       switch (cmd) {
+                                       case CTL_CMD_ENABLE:
+                                               
pr_info(PERF_EVLIST__ENABLED_MSG);
+                                               break;
+                                       case CTL_CMD_DISABLE:
+                                               
pr_info(PERF_EVLIST__DISABLED_MSG);
+                                               break;
+                                       case CTL_CMD_ACK:
+                                       case CTL_CMD_UNSUPPORTED:
+                                       default:
+                                               break;
+                                       }
+                               }
+                       }
                        waking++;
 
                        if (evlist__filter_pollfd(rec->evlist, POLLERR | 
POLLHUP) == 0)
-- 
2.24.1