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0001 /* SPDX-License-Identifier: GPL-2.0 */ 0002 #ifndef _LINUX_TRACE_CLOCK_H 0003 #define _LINUX_TRACE_CLOCK_H 0004 0005 /* 0006 * 3 trace clock variants, with differing scalability/precision 0007 * tradeoffs: 0008 * 0009 * - local: CPU-local trace clock 0010 * - medium: scalable global clock with some jitter 0011 * - global: globally monotonic, serialized clock 0012 */ 0013 #include <linux/compiler.h> 0014 #include <linux/types.h> 0015 0016 #include <asm/trace_clock.h> 0017 0018 extern u64 notrace trace_clock_local(void); 0019 extern u64 notrace trace_clock(void); 0020 extern u64 notrace trace_clock_jiffies(void); 0021 extern u64 notrace trace_clock_global(void); 0022 extern u64 notrace trace_clock_counter(void); 0023 0024 #endif /* _LINUX_TRACE_CLOCK_H */
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