Commit 458999c6 authored by Tingwei Zhang's avatar Tingwei Zhang Committed by Greg Kroah-Hartman
Browse files

tracing: Add trace_export support for trace_marker 



Add the support to route trace_marker buffer to other destination
via trace_export.

Reviewed-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarTingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/r/20201005071319.78508-5-alexander.shishkin@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8ab7a2b7

include/linux/trace.h

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


#define TRACE_EXPORT_FUNCTION	BIT(0)

#define TRACE_EXPORT_EVENT	BIT(1)

#define TRACE_EXPORT_MARKER	BIT(2)



/*

 * The trace export - an export of Ftrace output. The trace_export

kernel/trace/trace.c

+9 −0
Original line number Diff line number Diff line
@@ -271,6 +271,7 @@ static struct trace_export __rcu *ftrace_exports_list __read_mostly; 


static DEFINE_STATIC_KEY_FALSE(trace_function_exports_enabled);

static DEFINE_STATIC_KEY_FALSE(trace_event_exports_enabled);

static DEFINE_STATIC_KEY_FALSE(trace_marker_exports_enabled);



static inline void ftrace_exports_enable(struct trace_export *export)

{
@@ -279,6 +280,9 @@ static inline void ftrace_exports_enable(struct trace_export *export) 


	if (export->flags & TRACE_EXPORT_EVENT)

		static_branch_inc(&trace_event_exports_enabled);



	if (export->flags & TRACE_EXPORT_MARKER)

		static_branch_inc(&trace_marker_exports_enabled);

}



static inline void ftrace_exports_disable(struct trace_export *export)
@@ -288,6 +292,9 @@ static inline void ftrace_exports_disable(struct trace_export *export) 


	if (export->flags & TRACE_EXPORT_EVENT)

		static_branch_dec(&trace_event_exports_enabled);



	if (export->flags & TRACE_EXPORT_MARKER)

		static_branch_dec(&trace_marker_exports_enabled);

}



static void ftrace_exports(struct ring_buffer_event *event, int flag)
@@ -6687,6 +6694,8 @@ tracing_mark_write(struct file *filp, const char __user *ubuf, 
	} else

		entry->buf[cnt] = '\0';



	if (static_branch_unlikely(&trace_marker_exports_enabled))

		ftrace_exports(event, TRACE_EXPORT_MARKER);

	__buffer_unlock_commit(buffer, event);



	if (tt)

CRA Git | Maintained and supported by SUSTech CRA and CCSE