Usage and Decay

The cpu.usage attribute increases whenever a process attached to the lnode is charged for a CPU tick. The usage attribute value exponentially decays at a rate determined by the usage decay global Solaris Resource Manager parameter. The usage decay rate (described by a half-life in seconds) is set by the srmadm(1MSRM) command.

Although all processes have an lnode regardless of their current scheduling class, those outside the SHR scheduling class are never charged.