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14131f2f98
Impact: implement new tracing timestamp APIs Add three trace clock variants, with differing scalability/precision tradeoffs: - local: CPU-local trace clock - medium: scalable global clock with some jitter - global: globally monotonic, serialized clock Make the ring-buffer use the local trace clock internally. Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
20 lines
506 B
C
20 lines
506 B
C
#ifndef _LINUX_TRACE_CLOCK_H
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#define _LINUX_TRACE_CLOCK_H
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/*
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* 3 trace clock variants, with differing scalability/precision
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* tradeoffs:
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*
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* - local: CPU-local trace clock
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* - medium: scalable global clock with some jitter
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* - global: globally monotonic, serialized clock
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*/
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#include <linux/compiler.h>
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#include <linux/types.h>
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extern u64 notrace trace_clock_local(void);
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extern u64 notrace trace_clock(void);
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extern u64 notrace trace_clock_global(void);
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#endif /* _LINUX_TRACE_CLOCK_H */
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