2 * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
4 * Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
5 * clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
7 * Dual LGPL v2.1/GPL v2 license.
10 #ifndef _LTTNG_TRACE_CLOCK_H
11 #define _LTTNG_TRACE_CLOCK_H
13 #ifdef CONFIG_HAVE_TRACE_CLOCK
14 #include <linux/trace-clock.h>
15 #else /* CONFIG_HAVE_TRACE_CLOCK */
17 #include <linux/hardirq.h>
18 #include <linux/ktime.h>
19 #include <linux/time.h>
20 #include <linux/hrtimer.h>
23 static inline u64
trace_clock_monotonic_wrapper(void)
28 * Refuse to trace from NMIs with this wrapper, because an NMI could
29 * nest over the xtime write seqlock and deadlock.
35 return (u64
) ktime
.tv64
;
38 static inline u32
trace_clock_read32(void)
40 return (u32
) trace_clock_monotonic_wrapper();
43 static inline u64
trace_clock_read64(void)
45 return (u64
) trace_clock_monotonic_wrapper();
48 static inline u64
trace_clock_freq(void)
50 return (u64
) NSEC_PER_SEC
;
53 static inline int trace_clock_uuid(char *uuid
)
55 return wrapper_get_bootid(uuid
);
58 static inline int get_trace_clock(void)
61 * LTTng: Using mainline kernel monotonic clock. NMIs will not be
62 * traced, and expect significant performance degradation compared to
63 * the LTTng trace clocks. Integration of the LTTng 0.x trace clocks
64 * into LTTng 2.0 is planned in a near future.
66 printk(KERN_WARNING
"LTTng: Using mainline kernel monotonic clock.\n");
67 printk(KERN_WARNING
" * NMIs will not be traced,\n");
68 printk(KERN_WARNING
" * expect significant performance degradation compared to the\n");
69 printk(KERN_WARNING
" LTTng trace clocks.\n");
70 printk(KERN_WARNING
"Integration of the LTTng 0.x trace clocks into LTTng 2.0 is planned\n");
71 printk(KERN_WARNING
"in a near future.\n");
76 static inline void put_trace_clock(void)
80 #endif /* CONFIG_HAVE_TRACE_CLOCK */
82 #endif /* _LTTNG_TRACE_CLOCK_H */
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