utrace vs ptrace

["Peter Teoh" <htmldeveloper@xxxxxxxxx>]

this is the paper from OLS2008:

http://ols.fedoraproject.org/OLS/Reprints-2008/yamato-reprint.pdf

check out page 11:   where the interrupts nos is shown....noticed how
utrace cut down the interrupts by a whole lot.

The amazing part is that utrace can reduce the interrupts (and thus
the userspace to kernelspace context switch latency) by a whole, thus
improving tracing performance.

Does anyone have any idea of how it is achieved?


-- 
Regards,
Peter Teoh

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