Root/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 */
11struct 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 */
30extern int register_stat_tracer(struct tracer_stat *trace);
31extern void unregister_stat_tracer(struct tracer_stat *trace);
32
33#endif /* __TRACE_STAT_H */
34

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