7 * Copyright (C) 2005-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * This contains the definitions for the Linux Trace Toolkit tracer.
11 * Dual LGPL v2.1/GPL v2 license.
15 #include <linux/types.h>
16 #include <linux/limits.h>
17 #include <linux/list.h>
18 #include <linux/cache.h>
19 #include <linux/timex.h>
20 #include <linux/wait.h>
21 #include <asm/atomic.h>
22 #include <asm/local.h>
24 #include "wrapper/trace-clock.h"
25 #include "ltt-tracer-core.h"
26 #include "ltt-events.h"
28 #define LTTNG_VERSION 0
29 #define LTTNG_PATCHLEVEL 9
30 #define LTTNG_SUBLEVEL 1
36 /* Number of bytes to log with a read/write event */
37 #define LTT_LOG_RW_SIZE 32L
40 * Hardcoded event headers
42 * event header for a trace with active heartbeat : 27 bits timestamps
44 * headers are 32-bits aligned. In order to insure such alignment, a dynamic per
45 * trace alignment value must be done.
47 * Remember that the C compiler does align each member on the boundary
48 * equivalent to their own size.
50 * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8
51 * bytes aligned, so the buffer header and trace header are aligned.
53 * Event headers are aligned depending on the trace alignment option.
55 * Note using C structure bitfields for cross-endianness and portability
59 #define LTT_MAX_SMALL_SIZE 0xFFFFU
61 #ifdef RING_BUFFER_ALIGN
62 #define ltt_alignof(type) __alignof__(type)
64 #define ltt_alignof(type) 1
67 /* Tracer properties */
68 #define CTF_MAGIC_NUMBER 0xC1FC1FC1
69 #define TSDL_MAGIC_NUMBER 0x75D11D57
70 #define CTF_VERSION_MAJOR 0
71 #define CTF_VERSION_MINOR 1
74 * Number of milliseconds to retry before failing metadata writes on buffer full
75 * condition. (10 seconds)
77 #define LTTNG_METADATA_TIMEOUT_MSEC 10000
80 * Size reserved for high priority events (interrupts, NMI, BH) at the end of a
81 * nearly full buffer. User space won't use this last amount of space when in
82 * blocking mode. This space also includes the event header that would be
83 * written by this user space event.
85 #define LTT_RESERVE_CRITICAL 4096
87 #define LTT_RFLAG_EXTENDED RING_BUFFER_RFLAG_END
88 #define LTT_RFLAG_END (LTT_RFLAG_EXTENDED << 1)
90 /* Register and unregister function pointers */
92 enum ltt_module_function
{
93 LTT_FUNCTION_RUN_FILTER
,
94 LTT_FUNCTION_FILTER_CONTROL
,
95 LTT_FUNCTION_STATEDUMP
98 extern int ltt_module_register(enum ltt_module_function name
, void *function
,
99 struct module
*owner
);
100 extern void ltt_module_unregister(enum ltt_module_function name
);
102 /* Exported control function */
104 void ltt_core_register(int (*function
)(u8
, void *));
106 void ltt_core_unregister(void);
109 void ltt_statedump_register_kprobes_dump(void (*callback
)(void *call_data
));
111 void ltt_statedump_unregister_kprobes_dump(void (*callback
)(void *call_data
));
113 extern void ltt_dump_softirq_vec(void *call_data
);
115 #ifdef CONFIG_HAVE_LTT_DUMP_TABLES
116 extern void ltt_dump_sys_call_table(void *call_data
);
117 extern void ltt_dump_idt_table(void *call_data
);
119 static inline void ltt_dump_sys_call_table(void *call_data
)
123 static inline void ltt_dump_idt_table(void *call_data
)
128 #endif /* _LTT_TRACER_H */