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 */ 34