linux-kernel - [PATCH 2/4] tracing: add trace_export support for event trace

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Date:   Mon, 20 Jul 2020 10:21:15 +0800
From:   Tingwei Zhang <tingwei@...eaurora.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Tingwei Zhang <tingwei@...eaurora.org>, tsoni@...eaurora.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Mao Jinlong <jinlmao@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] tracing: add trace_export support for event trace

Only function traces can be exported to other destinations currently.
This patch exports event trace as well.

Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
---
 kernel/trace/trace.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bb62269724d5..aef6330836e2 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2697,17 +2697,6 @@ int tracepoint_printk_sysctl(struct ctl_table *table, int write,
 	return ret;
 }
 
-void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
-{
-	if (static_key_false(&tracepoint_printk_key.key))
-		output_printk(fbuffer);
-
-	event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer,
-				    fbuffer->event, fbuffer->entry,
-				    fbuffer->flags, fbuffer->pc, fbuffer->regs);
-}
-EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
-
 /*
  * Skip 3:
  *
@@ -2868,6 +2857,19 @@ int unregister_ftrace_export(struct trace_export *export)
 }
 EXPORT_SYMBOL_GPL(unregister_ftrace_export);
 
+void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
+{
+	if (static_key_false(&tracepoint_printk_key.key))
+		output_printk(fbuffer);
+
+	if (static_branch_unlikely(&ftrace_exports_enabled))
+		ftrace_exports(fbuffer->event);
+	event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer,
+				    fbuffer->event, fbuffer->entry,
+				    fbuffer->flags, fbuffer->pc, fbuffer->regs);
+}
+EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
+
 void
 trace_function(struct trace_array *tr,
 	       unsigned long ip, unsigned long parent_ip, unsigned long flags,
-- 
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