Developers working on the kernel often have a natural interest to watch and inspect what is going on inside the code. But they are not the only ones who would like to know what the kernel does. System administrators, for instance, might want to observe which decisions the kernel has taken and which actions were performed. This can be beneficial for a number of reasons, ranging from increased security to postmortem forensic investigation of things that went wrong. It could, for instance, be very interesting to not only observe that a wrong security decision caused by some misconfiguration was made by the kernel, but also to know which process or users took advantage of this. This chapter describes the methods provided by the kernel for this purpose.

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