DSFBK Back to Index page
 
Prolog 
Control Block Contents 
   DSFBK 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.

 
  DSFBK Control Block Content Top of page
  




 DSFBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DSFBK          Demand Scan Information Block
0000    0 Address      4 DSFFPNT        Forward pointer to next DSFBK
0004    4 Address      4 DSFBPNT        Backward pointer to prev DSFBK
0008    8 Address      4 DSFUSRBK       Ptr to bank of DSUBKs
          0000000C       DSFClr         * Area to clear before use
000C   12 Signed       4 DSFNEED        Count of frames needed this scan
0010   16 Dbl-Word     8 DSFSTART       Timestamp of Demand Scan start
0018   24 Address      4 DSFUSRCR       Ptr to current DSUBK; this is
                                        basically a place where one can
                                        store the current DSUBK in order
                                        to free a register for a moment.
001C   28 Address      4 DSFUSRLF       Ptr to head of DSUBK chain
0020   32 Address      4 DSFUSRLL       Ptr to tail of DSUBK chain
0024   36 Signed       4 DSFDSUCT       Count of DSUBKs used in chain
0028   40 Dbl-Word     8 DSFENDTM       Timestamp of Demand Scan End
0030   48 Bitstring    1 DSFwhoRq       Who requested demand scan
0031   49 Bitstring    1 DSFwhoFl       Who actually flagged demand scan
0032   50 Bitstring    1 * (2)          Reserved for IBM use
0038   56 Dbl-Word     8 DSFAGCST       Aging List count at start
0040   64 Signed       4 DSFAGFLI       Aging List ct in flight at start
0044   68 Signed       4 DSFAGRCL       Aging List ct reclaimable
0048   72 Dbl-Word     8 DSFAGNEE       Aging List need at start
0050   80 Signed       4 DSFASA2G       copy of RSAIAS
0054   84 Signed       4 DSFASB2G       copy of RSAASB2G
0058   88 Signed       4 DSFAGDFC       copy of RSAAGDFC (deficit)
005C   92 Signed       4 DSFRATEC       Rate-based contig need
0060   96 Signed       4 DSFRATES       Rate-based singles need
0064  100 Signed       4 DSF$END (0)    End of DSFBK DSECT
          00000058       DSFClrLn       *-DSFClr Length to clear
      End of DSFBK
          00000064       DSFLEN         *-DSFBK Size of DSFBK in bytes
          0000000D       DSFSIZE        (DSFLEN+7)/8 Size of DSFBK in
                                        doublewords
 
 
  DSFBK Storage Layout Top of page
  
          
*** DSFBK - Demand Scan Information Block
*
*     +---------------------------+---------------------------+
*   0 |         DSFFPNT           |         DSFBPNT           |
*     +---------------------------+---------------------------+
*   8 |         DSFUSRBK          |         DSFNEED           |
*     +---------------------------+---------------------------+
*  10 |                       DSFSTART                        |
*     +---------------------------+---------------------------+
*  18 |         DSFUSRCR          |         DSFUSRLF          |
*     +---------------------------+---------------------------+
*  20 |         DSFUSRLL          |         DSFDSUCT          |
*     +---------------------------+---------------------------+
*  28 |                       DSFENDTM                        |
*     +------+------+-------------+---------------------------+
*  30 |:WHORQ|:WHOFL|/////////////|///////////////////////////|
*     +------+------+-------------+---------------------------+
*  38 |                       DSFAGCST                        |
*     +---------------------------+---------------------------+
*  40 |         DSFAGFLI          |         DSFAGRCL          |
*     +---------------------------+---------------------------+
*  48 |                       DSFAGNEE                        |
*     +---------------------------+---------------------------+
*  50 |         DSFASA2G          |         DSFASB2G          |
*     +---------------------------+---------------------------+
*  58 |         DSFAGDFC          |         DSFRATEC          |
*     +---------------------------+---------------------------+
*  60 |         DSFRATES          |
*     +---------------------------+
*
*** DSFBK - Demand Scan Information Block
 
 
  DSFBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DSF$END        0064
DSFwhoFl       0031
DSFwhoRq       0030
DSFAGCST       0038
DSFAGDFC       0058
DSFAGFLI       0040
DSFAGNEE       0048
DSFAGRCL       0044
DSFASA2G       0050
DSFASB2G       0054
DSFBPNT        0004
DSFClr         0008 0000000C
DSFClrLn       0064 00000058
DSFDSUCT       0024
DSFENDTM       0028
DSFFPNT        0000
DSFLEN         0064 00000064
DSFNEED        000C
DSFRATEC       005C
DSFRATES       0060
DSFSIZE        0064 0000000D
DSFSTART       0010
DSFUSRBK       0008
DSFUSRCR       0018
DSFUSRLF       001C
DSFUSRLL       0020
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:54:20 EDT.
Copyright IBM Corporation, 1990, 2013