LXR linux/kernel/trace/trace

   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 */
  12struct 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                     (*stat_headers)(struct seq_file *s);
  26};
  27
  28/*
  29 * Destroy or create a stat file
  30 */
  31extern int register_stat_tracer(struct tracer_stat *trace);
  32extern void unregister_stat_tracer(struct tracer_stat *trace);
  33
  34#endif /* __TRACE_STAT_H */
  35