kernel/trace/trace_stat.h

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