linux/kernel/trace/trace_stat.h
Lai Jiangshan d8ea37d5de tracing/stat: Add stat_release() callback
Add stat_release() callback to struct tracer_stat, so a stat tracer
can release it's entries after the stat file has been read out.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A51B16A.6020708@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-07-10 12:14:05 +02:00

33 lines
973 B
C

#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 */
int (*stat_cmp)(void *p1, void *p2);
/* 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 */