Technical data

System Dump Analyzer
SHOW PROCESS
The process header display, also produced by the /PHD qualifier, provides
information taken from the process header (PHD), which is swapped into memory
when the process becomes part of the balance set. Each item listed in the display
reflects a quantity, count, or limit for the process’s use of the following resources:
• Process memory
• The pager
• The scheduler
• Asynchronous system traps
• I/O activity
• CPU activity
The process registers display, also produced by the /REGISTERS qualifier,
describes the hardware context of the context, as reflected in its registers.
The hardware context of a process is stored in two places:
• If the process is currently executing on a processor in the system (that is,
in the CUR scheduling state), its hardware context is contained in that
processor’s registers. (That is, the registers of the process and the registers
of the processor contain identical values, as illustrated by a SHOW CPU
command for that processor or a SHOW CRASH command if the process was
current at the time of the system failure.)
• If the process is not executing, its hardware context is stored in the part of
the PHD known as the hardware PCB.
The process registers display first lists those registers stored in the hardware
PCB (‘‘Saved process registers’’). If the process to be displayed is currently
executing on a processor in the system, the display then lists the processor’s
registers (‘‘Active registers for the current process’’). In each section, the display
lists the registers in the following groups:
• General-purpose registers (R0 through R11 and the AP, FP, and PC)
• Stack pointers (KSP, ESP, SSP, and USP)
• Special-purpose registers (PC and PSL)
• Base and length registers (P0BR, P1BR, P0LR, and P1LR)
The working set information and working set list displays, also produced
by the /WORKING_SET qualifier, describe those virtual pages that the process
can access without a page fault. After a brief description of the size, scope,
and characteristics of the working set list itself, SDA displays the following
information for each entry in the working set list.
Column Contents
INDEX Index into the working set list at which information for this entry
can be found
ADDRESS Virtual address of the page in the process address space that this
entry describes
SDA–153