d2579725e4aaecd38bccc9fb7c5df89b56d455ee
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>
22 static inline u64
trace_clock_monotonic_wrapper(void)
27 * Refuse to trace from NMIs with this wrapper, because an NMI could
28 * nest over the xtime write seqlock and deadlock.
34 return (u64
) ktime
.tv64
;
37 static inline u32
trace_clock_read32(void)
39 return (u32
) trace_clock_monotonic_wrapper();
42 static inline u64
trace_clock_read64(void)
44 return (u64
) trace_clock_monotonic_wrapper();
47 static inline u64
trace_clock_frequency(void)
49 return (u64
)NSEC_PER_SEC
;
52 static inline u32
trace_clock_freq_scale(void)
57 static inline int get_trace_clock(void)
60 * LTTng: Using mainline kernel monotonic clock. NMIs will not be
61 * traced, and expect significant performance degradation compared to
62 * the LTTng trace clocks. Integration of the LTTng 0.x trace clocks
63 * into LTTng 2.0 is planned in a near future.
65 printk(KERN_WARNING
"LTTng: Using mainline kernel monotonic clock.\n");
66 printk(KERN_WARNING
" * NMIs will not be traced,\n");
67 printk(KERN_WARNING
" * expect significant performance degradation compared to the\n");
68 printk(KERN_WARNING
" LTTng trace clocks.\n");
69 printk(KERN_WARNING
"Integration of the LTTng 0.x trace clocks into LTTng 2.0 is planned\n");
70 printk(KERN_WARNING
"in a near future.\n");
75 static inline void put_trace_clock(void)
79 #endif /* CONFIG_HAVE_TRACE_CLOCK */
81 #endif /* _LTTNG_TRACE_CLOCK_H */
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