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Groups > linux.kernel > #1174090

[PATCH v8 06/23] 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.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
---
 kernel/trace/trace.h                | 1 +
 kernel/trace/trace_events_trigger.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 6fe5b66..5e675b2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1110,6 +1110,7 @@ struct event_trigger_data {
 	struct event_filter __rcu	*filter;
 	char				*filter_str;
 	void				*private_data;
+	bool				paused;
 	struct list_head		list;
 };
 
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index e30539c..5f632ff 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -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;
@@ -109,6 +111,8 @@ 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);
 	}
-- 
1.9.3

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[PATCH v8 00/23] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:40 +0200
  [PATCH v8 01/23] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:40 +0200
  [PATCH v8 10/23] tracing: Add hist trigger support for compound keys Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:50 +0200
  [PATCH v8 06/23] tracing: Add a per-event-trigger 'paused' field Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:50 +0200
  [PATCH v8 11/23] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:50 +0200
  [PATCH v8 09/23] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:50 +0200
  [PATCH v8 08/23] tracing: Add 'hist' event trigger command Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-06-29 22:50 +0200

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