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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
SSHBK
Control Block Contents
SSHBK DSECT
SSHVBK DSECT
Cross Reference (Contains links to field and bit definitions)
SSHBK Prolog
NAME : HCPSSHBK
DESCRIPTION: User Share Settings control block
DSECT : SSHBK
FUNCTION : HCPSSHBK contains an array of share values for a
user per processor type as set by the SET SHARE
command. It is used by the System Resource
Manager (Scheduler) to schedule system resources
for the user.
LOCATED BY : VMDSSHBK pointer
CREATED BY : HCPBVM during user logon
DELETED BY : HCPUSP during logoff processing
REFERENCES : None
SERIALIZED : Scheduler lock (SRMSLOCK)
NOTES : Prior to the support
for the TYPE operand on the SET SHARE command, the
fields in this control block were not saved but were
calculated by adding the corresponding fields in each
VMDBK in the virtual configuration. This calculation
was adequate because the share values were set per user,
and applied to all CPU types. Now, share values are set
per CPU type and may even be set for a type of CPU that
the user has not yet defined. This requires a more
permanent place to store these values for each CPU type
for each user.
SSHBK Control Block Content
SSHBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SSHBK User Share Settings control block 0000 0 Bitstring 16 SSHARRAY (0) 0000000C SSHSIZE (*-SSHBK+7)/8 SSHBK size in double words 00000060 SSHBSIZE SSHSIZE*8 SSHBK size in bytes
SSHVBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SSHVBK User Share Settings control block 0000 0 Signed 4 SSHSHARS (0) A symbol used as a base for indexing the following two fields, SSHRELSH and SSHABSSH. Code depends on these fields each being fullwords and consecutive IN THE FOLLOWING ORDER. 0000 0 Signed 4 SSHRELSH The relative share setting for this CPU type. Code should be able to handle a range of 1-32767, although currently, only 1-10000 is valid. 0004 4 Signed 4 SSHABSSH The absolute share setting for this CPU type. The range is 0.01-1.00. 0008 8 Signed 4 SSHMXSHR The max-share setting for this CPU type. IT is either ABSOLUTE or RELATIVE the SSHMXSHA flag tells which. If it is RELATIVE it is an integer. If ABSOLUTE, it is stored as a fraction of the system, scaled SHRSCALE. If the user has no LIMIT it is zero. (See SSHLIMTH.) The following flag byte is defined to have the same values as the DVMDLIMT flag. 000C 12 Bitstring 1 SSHFLG1 Share flags byte 1 .1.. .... SSHLIMH X'40' SSHLIMH Limithard share option ..1. .... SSHNMSHA X'20' SSHNMSHA Normal share setting (SSHSHARS) for this CPU type for this user is ABSOLUTE, not RELATIVE. ...1 .... SSHMXSHA X'10' SSHMXSHA Max-share setting (SSHMXSHR) for this CPU type for this user is ABSOLUTE, not RELATIVE. 000D 13 Bitstring 1 SSHFLG2 Share flags byte 2 1... .... SSHVINV X'80' SSHVINV SSHVBK is marked invalid 000E 14 Bitstring 2 * Reserved for IBM use 00000010 SSHVSIZE (*-SSHVBK) SSVBK size in bytes
SSHBK Storage Layout
*** SSHBK - User Share Settings control block * * *** SSHBK - User Share Settings control block *** SSHVBK - User Share Settings control block * * +---------------------------+---------------------------+ * 0 | SSHRELSH | SSHABSSH | * +---------------------------+------+------+-------------+ * 8 | SSHMXSHR |:FLG1 |:FLG2 |/////////////| * +---------------------------+------+------+-------------+ * 10 * *** SSHVBK - User Share Settings control block
SSHBK Cross Reference
Symbol Dspl Value -------------- ---- ----- SSHABSSH 0004 SSHARRAY 0000 SSHBSIZE 0000 00000060 SSHFLG1 000C SSHFLG2 000D SSHLIMH 000C 40 SSHMXSHA 000C 10 SSHMXSHR 0008 SSHNMSHA 000C 20 SSHRELSH 0000 SSHSHARS 0000 SSHSIZE 0000 0000000C SSHVINV 000D 80 SSHVSIZE 000E 00000010
This information is based on z/VM V5R4.0. Last updated on 18 Feb 2010 at 04:10:07 EDT.
Copyright IBM Corporation, 1990, 2009