Messages in this thread | | | Date | Tue, 27 Oct 2015 22:28:16 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH] tracing: Only benchmark the time tracepoints take if tracing is on |
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On Tue, 27 Oct 2015 20:12:13 +0800 Chunyan Zhang <zhang.chunyan@linaro.org> wrote:
> There's no need to record the time tracepoints take when tracing is off. > This is because: > 1) We cannot see these records since ring_buffer record is off at that > moment. > 2) If tracing is off and benchmark tracepoint is enabled, the time > tracepoint takes is fewer than the same situation when tracing is on, > since the tracepoints need to be wrote into ring_buffer, it would > take more time. If turn on tracing at this moment, the average and > standard deviation cannot exactly present the time that tracepoints > take to write data into ring_buffer. >
Thanks! I'll add this when I get back from traveling.
-- Steve
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
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