Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / trace / trace_stat.h

diff --git a/kernel/kernel/trace/trace_stat.h b/kernel/kernel/trace/trace_stat.h
new file mode 100644 (file)
index 0000000..8f03914
--- /dev/null
+++ b/kernel/kernel/trace/trace_stat.h
@@ -0,0 +1,33 @@
+#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 */