With the integration of: 6881015 ZFS write activity prevents other threads from running in a timely manner 6899867 mstate_thread_onproc_time() doesn't account for runnable time correctly PSARC/2009/615 System Duty Cycle Scheduling Class and ZFS IO Observability
There is now a new system process for each zpool in the system. The processes show up in ps(1)/prstat(1) as "zpool-<poolname>", and contain all of the I/O taskq threads for the associated pool. The CPU % and microstate data for these processes give previously unavailable insight into the CPU resources used by ZFS I/O activity. Cheers, - Jonathan Adams & Blake Jones
