linux-kernel - [RFC PATCH v3 2/4] trace: Add an entry for printing trace log to STM

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Date:	Tue,  7 Jul 2015 18:10:41 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	rostedt@...dmis.org, mingo@...hat.com
Cc:	mathieu.poirier@...aro.org, serge.broslavsky@...aro.org,
	broonie@...nel.org, alexander.shishkin@...ux.intel.com,
	zhang.lyra@...il.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v3 2/4] trace: Add an entry for printing trace log to STM

output_stm is a link which is used to connect trace event
logging with STMs, will be used in the upcoming patches.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 include/linux/trace_events.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 1063c85..28dcdff 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -14,6 +14,7 @@ struct trace_buffer;
 struct tracer;
 struct dentry;
 struct bpf_prog;
+struct trace_buffer_stm;
 
 struct trace_print_flags {
 	unsigned long		mask;
@@ -293,6 +294,9 @@ struct trace_event_call {
 	 */
 	int			flags; /* static flags of different events */
 
+	void (*output_stm)(struct trace_seq *tmp_seq, void *entry,
+			   struct trace_buffer_stm *tb);
+
 #ifdef CONFIG_PERF_EVENTS
 	int				perf_refcount;
 	struct hlist_head __percpu	*perf_events;
@@ -412,6 +416,10 @@ enum event_trigger_type {
 	ETT_EVENT_ENABLE	= (1 << 3),
 };
 
+#ifdef CONFIG_STM_TRACE_EVENT
+extern void stm_trace_event_write(const char *buf, unsigned len);
+#endif
+
 extern int filter_match_preds(struct event_filter *filter, void *rec);
 
 extern int filter_check_discard(struct trace_event_file *file, void *rec,
-- 
1.9.1

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