[Lguest] Guest's Internal Clock

[Eviatar Khen]

Hi All,

As part on my master thesis I'm building a virtualization based 
development tool for the kernel. One of the features I would like to 
supply is CPU time profiling of certain kernel code segments.
The direction that I took here is to connect gdb to lguest guest via 
virtual serial, the application would put break points at the start and 
end of the interesting code segment.
The work is to document the start time and end time, and add it to the 
total results.
Now, I wonder if this documented time could be free from the overhead of 
the switches at I/O (both "real" I/O events and also gdb I/O events)?
Is there any internal "real" clock that doesn't account all this 
overhead AND it is accessible to launcher?
Ideas (of course I am ready to implement if needed) would be happily 
accepted.

Thank you and best regards,

Eviatar Khen