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 | cmp_func_t stat_cmp; |
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 (*)(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 | |