How is the Linux kernel tested ?

Question

How do the Linux kernel developers test their code locally and after they have it committed? Do they use some kind of unit testing, build automation? test plans?

Answer 1

As far as I know, there is an automatically performance regression check tool(named lkp/0 day) running/funding by the Intel, it will test each valid patch sent to the mailing list and check the scores changed from different microbenchmarks such as hackbench, fio, unixbench, netperf, etc, once there is a performance regression/improvement, a corresponding report will be sent directly to the patch author and Cc related maintainers.