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tracing: Add a per-event-trigger 'paused' field

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Add a simple per-trigger 'paused' flag, allowing individual triggers
to pause.  We could leave it to individual triggers that need this
functionality to do it themselves, but we also want to allow other
events to control pausing, so add it to the trigger data.

Link: http://lkml.kernel.org/r/fed37e4879684d7dcc57fe00ce0cbf170032b06d.1449767187.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2015-12-10 12:50:47 -06:00 • committed by Steven Rostedt
parent dbfeaa7aba
commit 104f281044
2 changed files with 5 additions and 0 deletions
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1
kernel/trace/trace.h
View file

@ -1172,6 +1172,7 @@ struct event_trigger_data {
struct event_filter __rcu *filter;
char *filter_str;
void *private_data;
bool paused;
struct list_head list;
};

4
kernel/trace/trace_events_trigger.c
View file

@ -72,6 +72,8 @@ event_triggers_call(struct trace_event_file *file, void *rec)
return tt;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->paused)
continue;
if (!rec) {
data->ops->func(data, rec);
continue;
@ -110,6 +112,8 @@ event_triggers_post_call(struct trace_event_file *file,
struct event_trigger_data *data;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->paused)
continue;
if (data->cmd_ops->trigger_type & tt)
data->ops->func(data, rec);
}