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In order to promote interoperability between userspace tracers and ftrace, add a trace_clock that reports raw TSC values which will then be recorded in the ring buffer. Userspace tracers that also record TSCs are then on exactly the same time base as the kernel and events can be unambiguously interlaced. Tested: Enabled a tracepoint and the "tsc" trace_clock and saw very large timestamp values. v2: Move arch-specific bits out of generic code. v3: Rename "x86-tsc", cleanups v7: Generic arch bits in Kbuild. Google-Bug-Id: 6980623 Link: http://lkml.kernel.org/r/1352837903-32191-1-git-send-email-dhsharp@google.com Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Signed-off-by: David Sharp <dhsharp@google.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
17 lines
352 B
C
17 lines
352 B
C
#ifndef _ASM_GENERIC_TRACE_CLOCK_H
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#define _ASM_GENERIC_TRACE_CLOCK_H
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/*
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* Arch-specific trace clocks.
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*/
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/*
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* Additional trace clocks added to the trace_clocks
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* array in kernel/trace/trace.c
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* None if the architecture has not defined it.
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*/
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#ifndef ARCH_TRACE_CLOCKS
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# define ARCH_TRACE_CLOCKS
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#endif
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#endif /* _ASM_GENERIC_TRACE_CLOCK_H */
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