kernel/trace/trace_stat.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __TRACE_STAT_H
   3 #define __TRACE_STAT_H
   4
   5 #include <linux/seq_file.h>
   6
   7 /*
   8  * If you want to provide a stat file (one-shot statistics), fill
   9  * an iterator with stat_start/stat_next and a stat_show callbacks.
  10  * The others callbacks are optional.
  11  */
  12 struct tracer_stat {
  13         /* The name of your stat file */
  14         const char              *name;
  15         /* Iteration over statistic entries */
  16         void                    *(*stat_start)(struct tracer_stat *trace);
  17         void                    *(*stat_next)(void *prev, int idx);
  18         /* Compare two entries for stats sorting */
  19         int                     (*stat_cmp)(void *p1, void *p2);
  20         /* Print a stat entry */
  21         int                     (*stat_show)(struct seq_file *s, void *p);
  22         /* Release an entry */
  23         void                    (*stat_release)(void *stat);
  24         /* Print the headers of your stat entries */
  25         int                     (*stat_headers)(struct seq_file *s);
  26 };
  27
  28 /*
  29  * Destroy or create a stat file
  30  */
  31 extern int register_stat_tracer(struct tracer_stat *trace);
  32 extern void unregister_stat_tracer(struct tracer_stat *trace);
  33
  34 #endif /* __TRACE_STAT_H */