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Hi - On Mon, Sep 26, 2005 at 11:26:12AM -0500, Jose R. Santos wrote: > [...] My question really was one of simplicity and performance. > I've looked at some of the SystemTap generated code and the size [is > of concern] [...] What I'm interested in is if the overhead of using > SystemTap to gather this information will be equal whether you use a > script or a special kprobe. [...] I am certain that we suffer extra overhead over a hand-written C kprobe. After all, we include a bunch of somewhat naive checking and debugging-enabling code. However, looking at the relevant assembly code, it's not *that* bad, and could be tightened in the future. > The previous poster sort of implied that there were some performance > issues with using SystemTap for tracing things like this. We will > do some performance overhead testing but I would also like to know > if anybody has done this type of measurements already. The system is changing rapidly enough, and we're all speculating enough, that only individual measurements can meaningfully answer such questions. - FChE
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