merge libmarkers, libtracing and libtracectl in a single libust library

[ust.git] / libust / tracercore.h

diff --git a/libust/tracercore.h b/libust/tracercore.h
new file mode 100644 (file)
index 0000000..e5ff00f
--- /dev/null
+++ b/libust/tracercore.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2005,2006 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
+ *
+ * This contains the core definitions for the Linux Trace Toolkit.
+ */
+
+#ifndef LTT_CORE_H
+#define LTT_CORE_H
+
+#include "list.h"
+#include "kernelcompat.h"
+//ust// #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);
+
+/* Keep track of trap nesting inside LTT */
+//ust// DECLARE_PER_CPU(unsigned int, ltt_nesting);
+extern unsigned int ltt_nesting;
+
+typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID);
+//typedef int (*ltt_run_filter_functor)(void *, __u16);
+
+extern ltt_run_filter_functor ltt_run_filter;
+
+extern void ltt_filter_register(ltt_run_filter_functor func);
+extern void ltt_filter_unregister(void);
+
+#if defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT)
+
+/*
+ * Calculate the offset needed to align the type.
+ * size_of_type must be non-zero.
+ */
+static inline unsigned int ltt_align(size_t align_drift, size_t size_of_type)
+{
+       size_t alignment = min(sizeof(void *), size_of_type);
+       return (alignment - align_drift) & (alignment - 1);
+}
+/* Default arch alignment */
+#define LTT_ALIGN
+
+static inline int ltt_get_alignment(void)
+{
+       return sizeof(void *);
+}
+
+#else
+
+static inline unsigned int ltt_align(size_t align_drift,
+                size_t size_of_type)
+{
+       return 0;
+}
+
+#define LTT_ALIGN __attribute__((packed))
+
+static inline int ltt_get_alignment(void)
+{
+       return 0;
+}
+#endif /* defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT) */
+
+#endif /* LTT_CORE_H */