linux-stable/kernel/trace/trace_stat.h
Andy Shevchenko 80042c8f06 tracing: Use generic type for comparator function
Comparator function type, cmp_func_t, is defined in the types.h,
use it in the code.

Link: http://lkml.kernel.org/r/20191007135656.37734-3-andriy.shevchenko@linux.intel.com

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2019-11-14 13:15:11 -05:00

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C

// SPDX-License-Identifier: GPL-2.0
#ifndef __TRACE_STAT_H
#define __TRACE_STAT_H
#include <linux/seq_file.h>
/*
* If you want to provide a stat file (one-shot statistics), fill
* an iterator with stat_start/stat_next and a stat_show callbacks.
* The others callbacks are optional.
*/
struct tracer_stat {
/* The name of your stat file */
const char *name;
/* Iteration over statistic entries */
void *(*stat_start)(struct tracer_stat *trace);
void *(*stat_next)(void *prev, int idx);
/* Compare two entries for stats sorting */
cmp_func_t stat_cmp;
/* Print a stat entry */
int (*stat_show)(struct seq_file *s, void *p);
/* Release an entry */
void (*stat_release)(void *stat);
/* Print the headers of your stat entries */
int (*stat_headers)(struct seq_file *s);
};
/*
* Destroy or create a stat file
*/
extern int register_stat_tracer(struct tracer_stat *trace);
extern void unregister_stat_tracer(struct tracer_stat *trace);
#endif /* __TRACE_STAT_H */