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Prolog 
Control Block Contents 
   SSHBK DSECT
   SSHVBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  SSHBK Prolog Top of page
 
 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)
 RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
              guest relocation (LGR).  The bits and fields that
              need to be relocated are defined in the
              corresponding LGRSSHBK COPY file.  Whenever changes
              are made to this control block, consideration must
              be given to any effects these changes will have on
              a relocation.  If any new fields or bits are
              defined, they may need to be relocated.  If
              existing bits or fields are changed, corresponding
              modifications may be required in the LGR version of
              this control block.  Consider also the effects of
              these changes on a relocation involving a back-level
              release of CP.
 COMPATIBILITY AND MIGRATION CONCERNS : 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 Top of page
 

 SSHBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SSHBK User Share Settings control block 0000 0 Bitstring 16 SSHARRAY (0) 0000000E SSHSIZE (*-SSHBK+7)/8 SSHBK size in double words 00000070 SSHBSIZE SSHSIZE*8 SSHBK size in bytes
 SSHVBK DSECT Top of page
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 Top of page
 
          
*** 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 Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
SSHABSSH       0004
SSHARRAY       0000
SSHBSIZE       0000 00000070
SSHFLG1        000C
SSHFLG2        000D
SSHLIMH        000C 40
SSHMXSHA       000C 10
SSHMXSHR       0008
SSHNMSHA       000C 20
SSHRELSH       0000
SSHSHARS       0000
SSHSIZE        0000 0000000E
SSHVINV        000D 80
SSHVSIZE       000E 00000010
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:30:51 EDT.
Copyright IBM Corporation, 1990, 2020