diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2018-11-05 18:04:57 +0900 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-12-10 12:22:44 -0500 |
| commit | 1ce25e9f6fff7633955e8ce776e5e9d7a780d34b (patch) | |
| tree | 566944194e31a26eece04e432bd79666e889ed1e /kernel/trace | |
| parent | 7e1413edd6194a9807aa5f3ac0378b9b4b9da879 (diff) | |
tracing: Add generic event-name based remove event method
Add a generic method to remove event from dynamic event
list. This is same as other system under ftrace. You
just need to pass the event name with '!', e.g.
# echo p:new_grp/new_event _do_fork > dynamic_events
This creates an event, and
# echo '!p:new_grp/new_event _do_fork' > dynamic_events
Or,
# echo '!p:new_grp/new_event' > dynamic_events
will remove new_grp/new_event event.
Note that this doesn't check the event prefix (e.g. "p:")
strictly, because the "group/event" name must be unique.
Link: http://lkml.kernel.org/r/154140869774.17322.8887303560398645347.stgit@devbox
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_dynevent.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c index f17a887abb66..dd1f43588d70 100644 --- a/kernel/trace/trace_dynevent.c +++ b/kernel/trace/trace_dynevent.c @@ -37,10 +37,17 @@ int dyn_event_release(int argc, char **argv, struct dyn_event_operations *type) char *system = NULL, *event, *p; int ret = -ENOENT; - if (argv[0][1] != ':') - return -EINVAL; + if (argv[0][0] == '-') { + if (argv[0][1] != ':') + return -EINVAL; + event = &argv[0][2]; + } else { + event = strchr(argv[0], ':'); + if (!event) + return -EINVAL; + event++; + } - event = &argv[0][2]; p = strchr(event, '/'); if (p) { system = event; @@ -69,7 +76,7 @@ static int create_dyn_event(int argc, char **argv) struct dyn_event_operations *ops; int ret; - if (argv[0][0] == '-') + if (argv[0][0] == '-' || argv[0][0] == '!') return dyn_event_release(argc, argv, NULL); mutex_lock(&dyn_event_ops_mutex); |