include/linux/trace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_TRACE_H
   3 #define _LINUX_TRACE_H
   4
   5 #ifdef CONFIG_TRACING
   6 /*
   7  * The trace export - an export of Ftrace output. The trace_export
   8  * can process traces and export them to a registered destination as
   9  * an addition to the current only output of Ftrace - i.e. ring buffer.
  10  *
  11  * If you want traces to be sent to some other place rather than ring
  12  * buffer only, just need to register a new trace_export and implement
  13  * its own .write() function for writing traces to the storage.
  14  *
  15  * next         - pointer to the next trace_export
  16  * write        - copy traces which have been delt with ->commit() to
  17  *                the destination
  18  */
  19 struct trace_export {
  20         struct trace_export __rcu       *next;
  21         void (*write)(struct trace_export *, const void *, unsigned int);
  22 };
  23
  24 int register_ftrace_export(struct trace_export *export);
  25 int unregister_ftrace_export(struct trace_export *export);
  26
  27 #endif  /* CONFIG_TRACING */
  28
  29 #endif  /* _LINUX_TRACE_H */