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Performance counters for Linux are a new kernel-based subsystem that provide a framework for all things performance analysis. It covers hardware level (CPU/PMU, Performance Monitoring Unit) features and software features (software counters, tracepoints) as well. To enforce the coupling between userspace and kernel, this commit introduces perf as a subpackage of the linux-wrs tree. perf is built directly inside the kernel tree (and hence picks up all appropriate patches), but is packaged as a separate utility that can be added to the rootfs and used to analyze the kernel. Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>