include/linux/trace.h

   1 #ifndef _LINUX_TRACE_H
   2 #define _LINUX_TRACE_H
   3
   4 #ifdef CONFIG_TRACING
   5 /*
   6  * The trace export - an export of Ftrace output. The trace_export
   7  * can process traces and export them to a registered destination as
   8  * an addition to the current only output of Ftrace - i.e. ring buffer.
   9  *
  10  * If you want traces to be sent to some other place rather than ring
  11  * buffer only, just need to register a new trace_export and implement
  12  * its own .write() function for writing traces to the storage.
  13  *
  14  * next         - pointer to the next trace_export
  15  * write        - copy traces which have been delt with ->commit() to
  16  *                the destination
  17  */
  18 struct trace_export {
  19         struct trace_export __rcu       *next;
  20         void (*write)(const void *, unsigned int);
  21 };
  22
  23 int register_ftrace_export(struct trace_export *export);
  24 int unregister_ftrace_export(struct trace_export *export);
  25
  26 #endif  /* CONFIG_TRACING */
  27
  28 #endif  /* _LINUX_TRACE_H */