Your question is a bit all over the map - are you interested in reducing CPU usage, reducing time spent in locks, or do you want to talk to the kernel more effi

Your question is a bit all over the map - are you interested in reducing CPU usage, reducing time spent in locks, or do you want to talk to the kernel more efficiently? Are you targeting, throughput, latency? That said, http://www.brendangregg.com/flamegraphs.html http://www.brendangregg.com/flamegraphs.html is a nice introduction to a site that has lots of material.