6. DATA SOURCES › 6.4 CPU Time Measurements › 6.4.3 CPU Time That Escapes Measurement

6.4.3 CPU Time That Escapes Measurement

As a general rule, MVS does not record CPU times that cannot
be reasonably attributed to a particular user.  For example,
the MVS dispatcher itself runs in non-captured time.  TSO
attentions are processed in non-captured time until the
user's address space is active.  Program checks are handled
in non-captured time.

The Real Storage Manager (RSM) and Auxiliary Storage Manager
(ASM) run non-captured while handling page faults that RSM
could not clear with a reclaim operation.  The System
Resource Manager (SRM) and Resource Management Function (RMF)
run non-captured while doing interval data gathering, as does
any other Disabled Interrupt Exit (DIE) processing.