Linux introspection and SystemTap

Linux introspection and SystemTap: "Modern operating system kernels provide the means for introspection, the ability to peer dynamically within the kernel to understand its behaviors. These behaviors can indicate problems in the kernel as well as performance bottlenecks. With this knowledge, you can tune or modify the kernel to avoid failure conditions. Discover an open source infrastructure called SystemTap that provides this dynamic introspection for the Linux® kernel."