2 * wrapper/trace-clock.c
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 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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
24 #include <wrapper/trace-clock.h>
26 #ifdef LTTNG_USE_NMI_SAFE_CLOCK
27 DEFINE_PER_CPU(u64
, lttng_last_tsc
);
28 EXPORT_PER_CPU_SYMBOL(lttng_last_tsc
);
29 #endif /* #ifdef LTTNG_USE_NMI_SAFE_CLOCK */
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."
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