Eric Lee / smarc-fsl-linux-kernel

14 Nov, 2012

1 commit

  • 8cbd9cc62   tracing,x86: Add a TSC trace_clock ... Browse Code ยป

    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
    Cc: Masami Hiramatsu
    Cc: Ingo Molnar
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Signed-off-by: David Sharp
    Signed-off-by: Steven Rostedt

    David Sharp