tracing: implement trace_clock_*() APIs

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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>

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This commit is contained in:

Ingo Molnar 2009-02-26 18:47:11 +01:00

parent 6409c4da28

commit 14131f2f98

4 changed files with 123 additions and 3 deletions

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19

include/linux/trace_clock.h

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1

kernel/trace/Makefile

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5

kernel/trace/ring_buffer.c

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101

kernel/trace/trace_clock.c

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