[lttng-modules.git] / wrapper / trace-clock.c

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * wrapper/trace-clock.c
 *
 * 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>
 */

#include <wrapper/trace-clock.h>

#ifdef LTTNG_USE_NMI_SAFE_CLOCK
DEFINE_PER_CPU(u64, lttng_last_tsc);
EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
#endif /* #ifdef LTTNG_USE_NMI_SAFE_CLOCK */

#ifdef LTTNG_CLOCK_NMI_SAFE_BROKEN
#warning "Your kernel implements a bogus nmi-safe clock source. Falling back to the non-nmi-safe clock source, which discards events traced from NMI context. Upgrade your kernel to resolve this situation."
#endif
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
b0725207 MD	3	* wrapper/trace-clock.c
	4	*
	5	* Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
	6	* clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
	7	*
	8	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
b0725207 MD	9	*/
b0725207 MD	10
5a2f5e92	11	#include <wrapper/trace-clock.h>
b0725207	12
60e1cd07 MD	13	#ifdef LTTNG_USE_NMI_SAFE_CLOCK
60e1cd07 MD	14	DEFINE_PER_CPU(u64, lttng_last_tsc);
b0725207	15	EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
60e1cd07	16	#endif /* #ifdef LTTNG_USE_NMI_SAFE_CLOCK */
254adeb0 MD	17
	18	#ifdef LTTNG_CLOCK_NMI_SAFE_BROKEN
	19	#warning "Your kernel implements a bogus nmi-safe clock source. Falling back to the non-nmi-safe clock source, which discards events traced from NMI context. Upgrade your kernel to resolve this situation."
	20	#endif