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Groups > linux.kernel > #1236676

[PATCH v10 06/26] 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 783f620..71cf384 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1111,6 +1111,7 @@ 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 c3abef6..8375d29 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;
@@ -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);
 	}
-- 
1.9.3

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[PATCH 00/26] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 06/26] tracing: Add a per-event-trigger 'paused' field Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 12/26] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 01/26] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 22/26] tracing: Add enable_hist/disable_hist triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 13/26] tracing: Add hist trigger support for pausing and continuing a trace Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 17/26] tracing: Add hist trigger 'execname' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 19/26] tracing: Add hist trigger support for stacktraces as keys Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 18/26] tracing: Add hist trigger 'syscall' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 04/26] tracing: Add event record param to trigger_ops.func() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 14/26] tracing: Add hist trigger support for clearing a trace Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 26/26] tracing: Add support for named hist triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 21/26] tracing: Remove restriction on string position in hist trigger keys Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 16/26] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200
  [PATCH v10 11/26] tracing: Add hist trigger support for compound keys Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-09-30 21:20 +0200

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