mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 14:14:01 +08:00
478409dd68
Currently Function traces can be only exported to the ring buffer. This adds a trace_export concept which can process traces and export them to a registered destination as an addition to the current one that outputs to Ftrace - i.e. ring buffer. In this way, if we want function traces to be sent to other destinations rather than only to the ring buffer, we just need to register a new trace_export and implement its own .write() function for writing traces to storage. With this patch, only function tracing (trace type is TRACE_FN) is supported. Link: http://lkml.kernel.org/r/1479715043-6534-2-git-send-email-zhang.chunyan@linaro.org Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
29 lines
902 B
C
29 lines
902 B
C
#ifndef _LINUX_TRACE_H
|
|
#define _LINUX_TRACE_H
|
|
|
|
#ifdef CONFIG_TRACING
|
|
/*
|
|
* The trace export - an export of Ftrace output. The trace_export
|
|
* can process traces and export them to a registered destination as
|
|
* an addition to the current only output of Ftrace - i.e. ring buffer.
|
|
*
|
|
* If you want traces to be sent to some other place rather than ring
|
|
* buffer only, just need to register a new trace_export and implement
|
|
* its own .write() function for writing traces to the storage.
|
|
*
|
|
* next - pointer to the next trace_export
|
|
* write - copy traces which have been delt with ->commit() to
|
|
* the destination
|
|
*/
|
|
struct trace_export {
|
|
struct trace_export __rcu *next;
|
|
void (*write)(const void *, unsigned int);
|
|
};
|
|
|
|
int register_ftrace_export(struct trace_export *export);
|
|
int unregister_ftrace_export(struct trace_export *export);
|
|
|
|
#endif /* CONFIG_TRACING */
|
|
|
|
#endif /* _LINUX_TRACE_H */
|