Messages in this thread | | | Date | Wed, 13 Dec 2017 11:46:29 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH v2] rtc: Add tracepoints for RTC system |
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On Wed, 13 Dec 2017 12:16:03 +0000 Mark Brown <broonie@kernel.org> wrote:
> On Wed, Dec 13, 2017 at 12:04:26PM +0100, Alexandre Belloni wrote: > > > Also, I think we could try having only the time64_t in the ring buffer. > > Maybe I'm wrong but I think tools reading that buffer can do the > > conversion themselves. Maybe I don't understand correctly how > > tracepoints work and this doesn't make sense, tell me. > > Tools reading the buffer can do the conversion themselves but it's also > useful for users to just view the log directly via tracing/trace > sometimes. OTOH the whole point is to be low overhead so...
Ideally, we want TP_fast_assign() do as little as possible, and put all the work in TP_printk() as the printk happens on read of the trace buffer and TP_fast_assign() happens at the tracepoint invocation.
-- Steve
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