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Re: [PATCH] djprobe: Low overhead probe method


Roland McGrath wrote:
Interesting work!  Have you compared your work to the "kerninst" work, and
made sure you have covered all potential gotchas that are mentioned in that
work?


Thanks, Roland

Djprobes looks like a good idea to reduce the overhead of the probes.


Ariel Tamches thesis discusses kernelinst in great detail and is available from:

http://www.cs.wisc.edu/~tamches/


Looking though the djprobe performance evaluation report list 7 shows a negative overhead for djprobes on Pentium M. Is there some improvement in performance due to layout? That certainly seems odd.


Is the gtod benchmark that much slower on AMD64 and Pentium M than Pentium4 (2232 and 2500 vs 230microseconds)? Could this be due to clock scaling?

-Will


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