linux-kernel - [PATCH v6 05/10] tracing: Add a per-event-trigger 'paused' field

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Message-Id: <9aa4f7b72cad7e0b7e897c3b6253601843800811.1433354807.git.tom.zanussi@linux.intel.com>
Date:	Wed,  3 Jun 2015 13:30:35 -0500
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	rostedt@...dmis.org
Cc:	daniel.wagner@...-carit.de, masami.hiramatsu.pt@...achi.com,
	namhyung@...nel.org, josh@...htriplett.org, andi@...stfloor.org,
	linux-kernel@...r.kernel.org,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH v6 05/10] tracing: Add a per-event-trigger 'paused' field

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@...ux.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 a3efff3..8dcb77c 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 7011468..ecf65e1 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -73,6 +73,8 @@ 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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