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 */ 35