/usr/src/lttng-modules-2.5.1/wrapper/trace-clock.h is in lttng-modules-dkms 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | #ifndef _LTTNG_TRACE_CLOCK_H
#define _LTTNG_TRACE_CLOCK_H
/*
* wrapper/trace-clock.h
*
* Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
* clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
*
* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef CONFIG_HAVE_TRACE_CLOCK
#include <linux/trace-clock.h>
#else /* CONFIG_HAVE_TRACE_CLOCK */
#include <linux/hardirq.h>
#include <linux/ktime.h>
#include <linux/time.h>
#include <linux/hrtimer.h>
#include <linux/version.h>
#include "../lttng-kernel-version.h"
#include "random.h"
#if LTTNG_KERNEL_RANGE(3,10,0, 3,10,14) || LTTNG_KERNEL_RANGE(3,11,0, 3,11,3)
#error "Linux kernels 3.10 and 3.11 introduce a deadlock in the timekeeping subsystem. Fixed by commit 7bd36014460f793c19e7d6c94dab67b0afcfcb7f \"timekeeping: Fix HRTICK related deadlock from ntp lock changes\" in Linux."
#endif
static inline u64 trace_clock_monotonic_wrapper(void)
{
ktime_t ktime;
/*
* Refuse to trace from NMIs with this wrapper, because an NMI could
* nest over the xtime write seqlock and deadlock.
*/
if (in_nmi())
return (u64) -EIO;
ktime = ktime_get();
return ktime_to_ns(ktime);
}
static inline u32 trace_clock_read32(void)
{
return (u32) trace_clock_monotonic_wrapper();
}
static inline u64 trace_clock_read64(void)
{
return (u64) trace_clock_monotonic_wrapper();
}
static inline u64 trace_clock_freq(void)
{
return (u64) NSEC_PER_SEC;
}
static inline int trace_clock_uuid(char *uuid)
{
return wrapper_get_bootid(uuid);
}
static inline int get_trace_clock(void)
{
/*
* LTTng: Using mainline kernel monotonic clock. NMIs will not be
* traced, and expect significant performance degradation compared to
* the LTTng trace clocks. Integration of the LTTng 0.x trace clocks
* into LTTng 2.0 is planned in a near future.
*/
printk(KERN_WARNING "LTTng: Using mainline kernel monotonic clock.\n");
printk(KERN_WARNING " * NMIs will not be traced,\n");
printk(KERN_WARNING " * expect significant performance degradation compared to the\n");
printk(KERN_WARNING " LTTng trace clocks.\n");
printk(KERN_WARNING "Integration of the LTTng 0.x trace clocks into LTTng 2.0 is planned\n");
printk(KERN_WARNING "in a near future.\n");
return 0;
}
static inline void put_trace_clock(void)
{
}
#endif /* CONFIG_HAVE_TRACE_CLOCK */
#endif /* _LTTNG_TRACE_CLOCK_H */
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