Not sure whether this is any good with respect to real-time audio. "LatencyTOP is a Linux tool for software developers (both kernel and userspace), aimed at identifying where system latency occurs, and what kind of operation/action is causing the latency to happen. By identifying this, developers can then change the code to avoid the worst latency hiccups." <http://www.latencytop.org/> It's part of Intel's OSS initiative: <http://oss.intel.com/>