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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>
33 lines
973 B
C
33 lines
973 B
C
#ifndef __TRACE_STAT_H
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#define __TRACE_STAT_H
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#include <linux/seq_file.h>
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/*
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* If you want to provide a stat file (one-shot statistics), fill
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* an iterator with stat_start/stat_next and a stat_show callbacks.
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* The others callbacks are optional.
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*/
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struct tracer_stat {
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/* The name of your stat file */
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const char *name;
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/* Iteration over statistic entries */
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void *(*stat_start)(struct tracer_stat *trace);
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void *(*stat_next)(void *prev, int idx);
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/* Compare two entries for stats sorting */
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int (*stat_cmp)(void *p1, void *p2);
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/* Print a stat entry */
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int (*stat_show)(struct seq_file *s, void *p);
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/* Release an entry */
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void (*stat_release)(void *stat);
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/* Print the headers of your stat entries */
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int (*stat_headers)(struct seq_file *s);
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};
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/*
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* Destroy or create a stat file
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*/
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extern int register_stat_tracer(struct tracer_stat *trace);
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extern void unregister_stat_tracer(struct tracer_stat *trace);
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#endif /* __TRACE_STAT_H */
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