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Groups > linux.kernel > #1254056

[PATCH v11 06/28] 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>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.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 892335a..08d9654 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1168,6 +1168,7 @@ 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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Thread

[PATCH 00/28] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 16/28] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 12/28] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:20 +0200
  [PATCH v11 01/28] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 27/28] kselftests/ftrace : Add event trigger testcases Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 10/28] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 06/28] tracing: Add a per-event-trigger 'paused' field Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 25/28] tracing: Add support for named triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 18/28] tracing: Add hist trigger 'syscall' modifier Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 03/28] tracing: Make event trigger functions available Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  [PATCH v11 04/28] tracing: Add event record param to trigger_ops.func() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  Re: [PATCH 00/28] tracing: 'hist' triggers Steven Rostedt <rostedt@goodmis.org> - 2015-10-22 20:30 +0200
    Re: [PATCH 00/28] tracing: 'hist' triggers Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:40 +0200
  [PATCH v11 05/28] tracing: Add get_syscall_name() Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-22 20:30 +0200
  Re: [PATCH v11 08/28] tracing: Add lock-free tracing_map Namhyung Kim <namhyung@kernel.org> - 2015-10-29 09:40 +0100
    Re: [PATCH v11 08/28] tracing: Add lock-free tracing_map Tom Zanussi <tom.zanussi@linux.intel.com> - 2015-10-29 19:40 +0100

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