This isn't particularly helpful/insightful. Considering that, for example, waiting for cache is meaningfully expressed in processor cycles, having that piece of

This isn't particularly helpful/insightful. Considering that, for example, waiting for cache is meaningfully expressed in processor cycles, having that piece of data in ns isn't particularly useful. Mutex locking perf also is a bit suspect, since probably nobody had multi-core CPUs pre-2003, meaning mutex locks/unlocks were simple memory writes, no shared cache invalidation involved. The only latency stats that can be meaningfully expressed in ns are the network and disk latencies.