Hi,

I've noticed the following somewhat puzzling effect on both Intel and ARM 
architecture computers:

If all trace events are enabled in one domain only, either kernel or user 
space, and there are lots of static tracepoints instrumented in the other, then 
these inactive tracepoints start causing overhead of about the same magnitude 
as if they were active, as if trace events were enabled in this domain.

Is there any obvious explanation to this behaviour?

Cheers,

Fredrik Östman

http://go.mentor.com/sourceryanalyzer/


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