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perf record: Implement control commands handling 

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

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/f0fde590-1320-dca1-39ff-da3322704d3b@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexey Budankov 2020-07-17 10:07:50 +03:00 committed by Arnaldo Carvalho de Melo
parent 68cd3b45b9
commit acce022394
1 changed files with 16 additions and 0 deletions
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16
tools/perf/builtin-record.c
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@ -1564,6 +1564,7 @@ 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);
@ -1883,6 +1884,21 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
draining = true;
}
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;
}
}
/*
* When perf is starting the traced process, at the end events
* die with the process and we wait for that. Thus no need to