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

/*
 * 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>
 *
 * 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
 */

#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
b0725207 MD	1	/*
	2	* wrapper/trace-clock.c
	3	*
	4	* Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
	5	* clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
	6	*
	7	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; only
	12	* version 2.1 of the License.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
5a2f5e92	24	#include <wrapper/trace-clock.h>
b0725207	25
60e1cd07 MD	26	#ifdef LTTNG_USE_NMI_SAFE_CLOCK
60e1cd07 MD	27	DEFINE_PER_CPU(u64, lttng_last_tsc);
b0725207	28	EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
60e1cd07	29	#endif /* #ifdef LTTNG_USE_NMI_SAFE_CLOCK */
254adeb0 MD	30
	31	#ifdef LTTNG_CLOCK_NMI_SAFE_BROKEN
	32	#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."
	33	#endif