[RFC patch 01/41] LTTng - core header

[Mathieu Desnoyers]

Contains the structures required by the builtin part of the LTTng tracer.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
---
 include/linux/ltt-core.h |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

Index: linux-2.6-lttng/include/linux/ltt-core.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6-lttng/include/linux/ltt-core.h	2009-03-04 13:37:26.000000000 -0500
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2005,2006 Mathieu Desnoyers (mathieu.desnoyers@xxxxxxxxxx)
+ *
+ * This contains the core definitions for the Linux Trace Toolkit.
+ */
+
+#ifndef LTT_CORE_H
+#define LTT_CORE_H
+
+#include <linux/list.h>
+#include <linux/percpu.h>
+
+/* ltt's root dir in debugfs */
+#define LTT_ROOT        "ltt"
+
+/*
+ * All modifications of ltt_traces must be done by ltt-tracer.c, while holding
+ * the semaphore. Only reading of this information can be done elsewhere, with
+ * the RCU mechanism : the preemption must be disabled while reading the
+ * list.
+ */
+struct ltt_traces {
+	struct list_head setup_head;	/* Pre-allocated traces list */
+	struct list_head head;		/* Allocated Traces list */
+	unsigned int num_active_traces;	/* Number of active traces */
+} ____cacheline_aligned;
+
+extern struct ltt_traces ltt_traces;
+
+/*
+ * get dentry of ltt's root dir
+ */
+struct dentry *get_ltt_root(void);
+
+void put_ltt_root(void);
+
+/* Keep track of trap nesting inside LTT */
+DECLARE_PER_CPU(unsigned int, ltt_nesting);
+
+typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID);
+
+extern ltt_run_filter_functor ltt_run_filter;
+
+extern void ltt_filter_register(ltt_run_filter_functor func);
+extern void ltt_filter_unregister(void);
+
+#endif /* LTT_CORE_H */

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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